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61results about How to "Achieve lossless compression" patented technology
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Real-time data compression method
ActiveCN1786939AAchieve lossless compressionFulfil requirementsCode conversionComplex mathematical operationsReal-time dataNetwork packet
The invention relates to a real time data compressing method, for compressing in-data packet data in a process control system, where the real time data comprises numerical values of analogue quantities and the method comprises: 1) initializing a dictionary, i.e. initializing characters that possibly occur during compressing into a dictionary; 2) reading in numerical valves; 3) making subtraction of adjacent data to obtain difference values and storing the first read-in numerical value in compressed files; 4) adopting LZW algorithm to compress the difference values. The invention realizes the lossless compression of real time data and the compressing course is safe and reliable. The invention has very good rapidness and can meet the requirements of real time databases and raises the history data inquiring efficiency.
Owner:ZHEJIANG SUPCON TECH
Compression method for electric power waveform recording date
InactiveCN101038303AIncrease flexibilitySmall amount of calculationDigital variable/waveform displayComputer resourcesElectric power system
The present invention discloses a compressing method of the data recorded by the electric power waveform. The compressing process includes the steps of: the collected data is performed by the integer small wave conversion based on the rising format and then all the data having been converted is coded in the Huffman method; the decompressing process includes the steps of: each pressing data that is read in bit is decoded in Huffman method, and then the data having been decoded is performed by the integer small wave contra-conversion. The present invention has the characteristics of a small amount of computing, a high compressing rate, a small distortion factor, a small occupied computer resources, etc. and the method can be realized in a flushbonding system. The compressibility and the distortion factor can be adjusted according to the demand and the flexibility of the using of the software is added. The present invention can also provide a threshold value to the detail information to realize the lossless compressing and the lossy compression. The electric power system waveform recording device in the present can realize a long-time and continuous recording waveform by combining the electric hardware technology under the situation of high sampling rate and big capability and the waveform can be transmitted far away through the communication interface reliably and quickly.
Owner:SHENZHEN SHUANGHE ELECTRIC CO LTD
Equivalent coordinative optimization method for large-scale power grid dispatching plan
ActiveCN105226708AQuick solveAchieve lossless compressionSingle network parallel feeding arrangementsPower gridComputer science
The invention provides an equivalent coordinative optimization method for a large-scale power grid dispatching plan. The optimization method comprises the steps as follows: (1) a large power grid is divided into a plurality of regional power grids, and the regional power grids are taken as equivalent nodes; (2) the regional power grids submit information of the equivalent nodes to the whole grid; (3) the whole grid determines a generation dispatching plan under the equivalent regional power grids, and issues a connecting line plan between the regions, planned total output of the regional power grids and a plan of a direct dispatching set; (4) the regional power grids calculate and determine output plans of regional sets according to the planned total output of the regional power grids, and calculate locational marginal cost; and (5) whether full-grid optimization is converged or not is judged through the marginal cost of two ends of a connection line, if so, calculation is ended, if not, the set which affects the grid security constraint corrects output bounds according to the optimization result and turns to the step (2). The iteration times can be controlled; the convergence is rapid; and rapid determination of the large power grid dispatching plan can be achieved.
Owner:CHINA ELECTRIC POWER RES INST +2
Digital image nondestructive compression method and device, resolution method and image encoder
InactiveCN101272442AAchieve lossless compressionSave storage spaceTelevision systemsDigital video signal modificationComputer visionDigital image
The invention relates to the lossless compression method of digital images. Whether a section of pixels is the continuous same or the discontinuous same is examined according to the adjacent pixels in the spacial position in the image and is shown by flag bits. And the flag bits and step sizes are indicated by indicating bytes. If n continuous pixels are the same, one of the pointing byte is in front of the specific color value of one of the pixels; if n continuous pixels are different, the pointing byte is in front of the specific color value of the n pixels. The invention also provides the lossless compression device, the resolution method and the encoder of the digital images based on the method. The lossless compression method of the digital image has the advantages of high compression rate, fast decompression speed, storage space saving performance and good real-time performance.
Owner:杭州波导软件有限公司
Spatial-spectral associated prediction-based hyperspectral image lossless compression method
ActiveCN101883274AReducing Spatial RedundancyReduce the amount of encoding calculationTelevision systemsDigital video signal modificationCorrelation coefficientPrediction algorithms
The invention relates to a spatial-spectral associated prediction-based hyperspectral image lossless compression method, which comprises the following steps: conducting band combination to input hyperspectral images according to the magnitude of a spectrum correlation coefficient; selecting corresponding prediction algorithms according to different band combinations to eliminate correlation and to obtain a difference image; and conducting RICE entropy coding to the difference image to obtain a compressed code stream, storing or transmitting the compressed code stream and realizing reversible decoding locally or at other places. By adopting the method, the invention has the advantages that the spatial-spectral redundancy of the entire image can be effectively reduced, the calculated amountfor coding is reduced, no information is lost in the entire coding process, the lossless compression is realized, the lossless compression ratio of the hyperspectral image is improved, the storage resource required for image storage is reduced, the transmission bandwidth burden is reduced, the coding complexity is low, the hardware realization and the real-time transmission are facilitated and the error resilience is good.
Owner:SHENYANG INST OF AUTOMATION - CHINESE ACAD OF SCI
Image lossless compression and decompression method based on lifting wavelet transform
InactiveCN101984666AAchieve lossless compressionImprove the problem of excessive calculationTelevision systemsDigital video signal modificationImage compressionLossless compression
The invention relates to an image lossless compression and decompression method based on lifting wavelet transform, belonging to the image compression field. The method comprises the following steps: the lifting scheme is utilized to obtain lifting wavelet, lifting wavelet transform is performed to an original natural image, the matrix transform of integer domain is completed to obtain restorable a wavelet coefficient which is an integer; and the wavelet coefficient is decomposed according to the characteristic of the wavelet coefficient to obtain low frequency coefficients and high frequency coefficients, and the obtained low frequency coefficients and high frequency coefficients are coded respectively so as to effectively increase the coding efficiency, wherein predictive coding is adopted for the low frequency coefficients and the SPIHT coding is adopted for the tree structure formed by the high frequency coefficients, thus the aim of lossless compression can be achieved and repeated comparisons in the SPIHT algorithm can be reduced. The method of the invention can increase the compression ratio and compression efficiency of the image as far as possible under the premise of ensuring that the image is undistorted.
Owner:NANJING UNIV OF POSTS & TELECOMM
Real-time lossless compression method for image
ActiveCN102215385AReduce Spatial RedundancyNot lostTelevision systemsDigital video signal modificationJPEGLossless compression
The invention relates to a real-time lossless compression method for an image. The method comprises the following steps: setting the length of a predictor according to the specification of an input initial image; predicting by using a JPEG-LS (Information T) predictor according to the input image, and carrying out subtraction on the actual value and the predicted value to obtain a residual which can be mapped to a nonnegative integer and a preprocessing result of the input image; dividing and accumulating according to the different values of division mode k and the preprocessing result of the input image, and calculating a total code length when k is equal to 0, 1, 2,..., n-3, marking a k value which corresponds to the minimum value of the code length as a k<*>, wherein n is a bit wide when the pixel value of the imported image is converted to a binary system; dividing a sample of the whole image according to the k<*> to obtain a compressed code steam for storing or transmitting. For a gray image with poor continuous color tonality, particularly a spaceborne remote sensing image, the invention can effectively reduce the space redundancy of the whole image and decrease the average value of the sample; and meanwhile, any information cannot be lost during the whole coding process and a lossless compression can be realized.
Owner:SHENYANG INST OF AUTOMATION - CHINESE ACAD OF SCI
Compressing encode/decode method for three-dimensional model texture based on Quardtree
ActiveCN101447084AImprove division efficiencyFast convergenceImage codingTelevision systemsENCODEThree dimensional model
A compressing encode method for a three-dimensional model texture based on Quardtree comprises the following steps: (1) dividing texture images according to Quardtree, resolving the texture images into a series of base textures with different resolutions, and coding the base textures; (2) arranging texture coordinates, and coding the texture coordinates successively. A decoding method corresponding to the coding method comprises the following steps: synchronously transferring texture data stream and geometric grid data, and decoding and recovering the texture data stream and the geometric grid data; and matching the texture data stream and the geometric grid data with geometrical model of the corresponding resolutions according to the textures with different resolutions. The compressing encode / decode method f of the invention has the advantages of high division efficiency, fast convergence rate as well as short client terminal responding and waiting time, and can control precision of model texture decode.
Owner:SHENZHEN FUTURE 3D EDU TECH CO LTD
Lossless spectrum image compression method based on support vector regression
ActiveCN104270640AAchieve lossless compressionThe result is obviousDigital video signal modificationCluster algorithmPattern recognition
The invention belongs to the technical field of spectrum remote sensing, and provides a lossless spectrum image compression method based on support vector regression. The method comprises the following steps that firstly, an original image is guided in; secondly, a clustering algorithm is selected, classification preprocessing is carried out on the spectrum image, and a corresponding cluster index is acquired; thirdly, a prediction algorithm is selected, a prediction model is designed, and all pixels of the whole spectrum image are predicted according to the obtained cluster index and the prediction model so as to obtain a predicted image; fourthly, a differential method is adopted on the original image and the prediction image to obtain a residual image; fifthly, arithmetic coding is adopted on the residual image, the prediction coefficients obtained during prediction of the prediction model and the cluster index obtained through the clustering algorithm are coded to obtain a code stream file. According to the method, due to the fact that the read image is clustered, prediction models are established for all types, and the residual image and the side information are coded, the lossless spectrum compression based on support vector regression is achieved, a good lossless compression effect is achieved, the prediction accuracy is high, and the residual error is small.
Owner:XIDIAN UNIV +1
Data encoding method and device and storage medium
InactiveCN109428602AAchieve lossless compressionEasy to compressCode conversionPattern recognitionData encoding
The invention discloses a data encoding method and device and a storage medium. The data encoding method comprises the following steps: acquiring a to-be-encoded character string and a preset intervallength, wherein the to-be-coded character string comprises a plurality of first preset characters and a second preset character; determining a coefficient critical value according to a maximum numberof times of consecutive occurrences of the second preset character in the to-be-encoded character string; selecting an encoding coefficient less than the coefficient critical value from a preset coefficient list; determining a first encoding interval corresponding to the first preset characters and a second encoding interval corresponding to the second preset character according to the interval length and the encoding coefficient; encoding the to-be-encoded character string by using the interval length, the encoding coefficient, the first encoding interval and the second encoding interval toacquire an encoded value; and generating an encoded result according to the encoded value, and outputting the encoded result. Therefore, nondestructive compression of binary data can be well realized;and the data encoding method is high in compression capacity and good in compression effect.
Owner:QIANHAI ZHONGKE CHIP HLDG SHENZHEN CO LTD
Data encoding method and decoding method
ActiveCN110635807AAchieve lossless compressionIncrease the difficultyCode conversionCyclic codesPasswordLossless compression
The invention discloses a data encoding method and a data decoding method. The method comprises: calculating the normalization probability p(x) and the non-normalization probability of a symbol x in abinary sequence, and then setting a coefficient r, so that a distribution function F(x, r)=rF(x) of a non-normalization probability model is obtained; setting R0=H0=1 and L0=0; obtaining an arithmetic coding formula Ri=Ri-1rp(x), Li=Li-1+Ri-1F(x-1, r) and Hi=Li+Ri of the ith symbol x; and finally obtaining a maximum threshold value of the coefficient r, and carrying out valuing and password information adding on the coefficient r in a range of (0, rmax). By means of the encoding and decoding technology, encrypted data can have the lossless compression function, the encryption function, the error detection function and the like at the same time, and the single function is avoided; and meanwhile, the application range is very wide, and especially when the method is applied to a chip and a system bottom layer, the method has great energy-saving and consumption-reducing effects.
Owner:HUNAN YAOSHENG COMM TECH CO LTD
Real-time data compression method
ActiveCN100385437CAchieve lossless compressionFulfil requirementsCode conversionComplex mathematical operationsReal-time dataNetwork packet
The invention relates to a real time data compressing method, for compressing in-data packet data in a process control system, where the real time data comprises numerical values of analogue quantities and the method comprises: 1) initializing a dictionary, i.e. initializing characters that possibly occur during compressing into a dictionary; 2) reading in numerical valves; 3) making subtraction of adjacent data to obtain difference values and storing the first read-in numerical value in compressed files; 4) adopting LZW algorithm to compress the difference values. The invention realizes the lossless compression of real time data and the compressing course is safe and reliable. The invention has very good rapidness and can meet the requirements of real time databases and raises the history data inquiring efficiency.
Owner:ZHEJIANG SUPCON TECH
Track compression and decompression method
ActiveCN104242949AFast Partial Reduction AnalysisAccurate Local Reduction AnalysisCode conversionAlgorithmSimulation
The invention discloses a track compression method. The track compression method comprises the steps that S1, a track to be compressed is scanned, fixed points in the track to be compressed are obtained, the track is the path generated in the motion process of a moving object in space, and the fixed points are the starting point of the track or a road intersection or a terminal point; S2, a pre-configured frequent subsequent list is inquired, whether the subsequent fixed point of the fixed points in the track to be compressed is the most frequent subsequent fixed point of the fixed points or not is judged, the subsequent fixed point is the next fixed point adjacent to the fixed points, and if the subsequent fixed point of the fixed points in the track to be compressed is the most frequent subsequent fixed point of the fixed points, the step S3 is executed; S3, the most frequent subsequent fixed point is expressed with a negative number, and the set of the fixed points and negative numbers is obtained, and is adopted as the compressed track. Correspondingly, the invention provides a decompression method of the compressed track obtained through the track compression method. According to the track compression and decompression method, lossless compression of the high compression rate and high efficiency can be carried out on the track through track characteristics.
Owner:GUANGZHOU HKUST FOK YING TUNG RES INST
Data encoding/decoding method and device
ActiveCN109474281AImprove compression efficiencyAchieve lossless compressionCode conversionLower limitData compression
The invention discloses a data encoding / decoding method and device. The data encoding method comprises the following steps: acquiring a to-be-encoded character string, and adding a character 0 behindevery continuous N characters 1 in the to-be-encoded character string; performing division through a node between the adjacent characters 1 and 0, dividing the to-be-encoded character string into multiple sub-character strings; determining the corresponding encoding coefficient according to the occurrence amount of the continuous characters 1 of each to-be-encoded character string, and encoding each character in each character string according to the corresponding encoding coefficient, thereby obtaining an encoding interval lower limit value of the to-be-encoded character string. The encodingand decoding are performed through the multi-encoding coefficient, the nondestructive compression and reduction of the data are realized when the data compression efficiency is improved.
Owner:湖南瑞利德信息科技有限公司
Achieving method of remote-sensing image compression system
InactiveCN104079930AAchieve lossless compressionEasy transferDigital video signal modificationSensing dataStream data
An achieving method of a remote-sensing image compression system comprises the following steps of 101 acquiring remote sensing image data; 102 adopting a wavelet transformation method to perform mapping transformation on the remote sensing image data through a mapping converter so as to form mapping conversion data; 103 using an entropy encoder to perform encoding processing on the mapping conversion data and outputting encoding stream data; 104 compressing the encoding stream data to finish remote sensing image data compression. By adopting the achieving method, lossless compression of large-capacity remote sensing images can be quickly achieved, the increasingly prominent contradiction between the limited channel capacity and large-volume remote sensing data transmission in the prior art is solved, and great convenience is brought to data transmission and storage.
Owner:MAPUNI TECH CO LTD
Image compression and decompression method and device
ActiveCN110113617AAchieve lossless compressionLossless compression reducesDigital video signal modificationImage compressionLossless compression
The embodiment of the invention discloses an image compression and decompression method and device, and the method comprises the steps of obtaining at least one image pair in a target image, wherein each image pair comprises any two adjacent frames of images in the target image; determining the pixel difference data between the two frames of images in the at least one image pair, sorting the pixeldifference data, and determining the sorted pixel difference data as the compressed data corresponding to a compressed frame image in the target image, wherein the compressed frame image is a frame image except a first frame image in the target image; and synthesizing the first frame of image in the multiple frames of images and the compressed data into a compressed image corresponding to the target image. The method also includes decompressing the generated compressed image by obtaining the pixel difference data. By adopting the image compression and decompression method and device, the display effect of the image can be ensured while the size of the image is reduced, the lossless compression of the image is effectively realized, and the network transmission consumption of the image in the application is reduced.
Owner:TENCENT TECH (SHENZHEN) CO LTD
Monitor console scheduling KVM switch system
InactiveCN107291278AAvoid redoing workAchieve lossless compressionData switching networksInput/output processes for data processingDisplay deviceKVM switch
The invention provides a monitor console scheduling KVM switch system. The system is characterized by comprising a system host unit, a signal sending unit, a signal receiving unit and a KVM unit, wherein the system host unit edits and sends a display signal and keyboard and mouse signals; the signal sending unit sends the display signal and the keyboard and mouse signals to outside through an IP network; the signal receiving unit receives the display signal and the keyboard and mouse signals from the signal sending unit through the IP network; the KVM unit comprises a display, a keyboard and a mouse; the display receives the display signal and realizes corresponding control operation; and the keyboard and the mouse receive the keyboard and mouse signals and realize the corresponding control operation. According to the system, the purpose of enabling a scheduler to control all monitor hosts by use of a set of keyboard and mouse device when monitoring a plurality of display screens at the same time is achieved.
Owner:国网江苏省电力有限公司常熟市供电分公司
IntMDCT-based lossless audio encoding method and decoding method
The invention provides an IntMDCT-based lossless audio encoding method and decoding method. The encoding method includes the following steps that: (1) audio time domain signals x (k) are framed, and a single frame of time domain signals x (k) can be obtained, wherein the k=0,..., N-1, wherein the N is frame length; (2) IntMDCT transformation is performed on the time domain signals, so that frequency domain signals X (m) can be obtained, wherein the m=0,..., N-1; and (3) Rice encoding is performed on the frequency domain signals, so that code streams can be obtained. The decoding method is an inverse process of the encoding method and includes the following steps that: firstly, Rice decoding is performed on an inputted code stream file, so that the frequency domain signals X (m) can be obtained, wherein the m=0,..., N-1; and secondly, IntMDCT inverse transformation is performed, so that the time domain signals x (k) can be restored, wherein the k=0,..., N-1. With the methods of the invention adopted, encoding parameters can be obtained adaptively, and the value of compression ratio is lower than that of block adaptive Rice, and the methods of the invention have a wider applicable range.
Owner:SICHUAN JIUZHOU ELECTRIC GROUP
Image data compression method and system based on artificial intelligence
PendingCN114170331AWill not cause color differenceAchieve lossless compressionImage analysisImage codingPattern recognitionLossless compression
The invention relates to the technical field of artificial intelligence, in particular to an image data compression method and system based on artificial intelligence. The method comprises the following steps: analyzing two-dimensional color information of a training image, analyzing boundary two-dimensional color information reaching a lossless effect boundary according to a two-dimensional standard deviation of the two-dimensional color information on a preset order, and obtaining a Gaussian model of each pixel point according to the two-dimensional standard deviation; the color tropism is obtained according to the difference of the compressed color information and the boundary two-dimensional color information on a Gaussian model, and a loss function is constructed by further combining the chromatic aberration between the pixel point and other pixel points in a neighborhood range before and after the pixel point is compressed. And training the self-encoding neural network by taking the two-dimensional color information as training data. Lossless compression is achieved through the self-encoding neural network. According to the method, the network is constrained by obtaining the boundary of the color latitude, and lossless compression of the image data by using the self-encoding neural network is realized.
Owner:ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
Data compression method and system for wireless sensor network
InactiveCN106101101AAchieve lossless compressionReduce data sizeNetwork traffic/resource managementNetwork topologiesLine sensorOriginal data
The invention discloses a data compression method and system for a wireless sensor network. Node data of the wireless sensor network is obtained; and conversion and drawing are carried out according to the node data, thereby obtaining an original signal. Mathematical morphological slicing is carried out on the original signal by employing a horizontal hierarchical slicing algorithm, thereby obtaining slicing data. Cluster analysis is carried out on the slicing data, thereby obtaining a slicing distribution curve of the original signal. According to the method and the system, the mathematical morphological processing is carried out on the waveform of the data collected by the wireless sensor network; the waveform of the original data is converted into the slicing distribution curve without changing the original data; the data scale is reduced; the lossless compression can be carried out on the large-scale data; and the application range is expanded.
Owner:SHENZHEN INST OF ADVANCED TECH +1
Real-time centralized monitoring and management method for distributed renewable energy power station
InactiveCN108599254AAddress defects that cannot be collected in real timeEasy to monitorSingle network parallel feeding arrangementsSystems intergating technologiesPower stationElectric power system
The invention discloses a real-time centralized monitoring and management method for a distributed renewable energy power station, and belongs to the technical field of power systems and automation thereof. The method comprises the following steps: acquiring acquisition terminal data; data centralized parsing; data storing; data encryption; data uploading; and enabling data to enter a scheduling data network. The invention further discloses a real-time centralized monitoring and management system and equipment for the distributed renewable energy power station for implementing the method, anda readable storage medium storing the method. According to real-time centralized monitoring and management method for the distributed renewable energy power station provided by the invention, unifiedmonitoring, scheduling and management are carried out on the distributed renewable energy power station, the monitoring and management level of the renewable energy power generation station can be effectively improved, and the sustainable development of a country is facilitated.
Owner:STATE GRID ANHUI ELECTRIC POWER +2
Compression method and device for skeletal animation data
ActiveCN111161365AReduce data volumeAchieve lossless compressionImage codingAnimationAnimationRadiology
The invention provides a compression method and device for skeletal animation data, and the method comprises the steps: obtaining the skeletal animation data of a virtual object, and obtaining the skeletal displacement data, skeletal rotation data and skeletal scaling data, corresponding to each key frame, of each skeletal node of the virtual object from the skeletal animation data; constructing afirst storage table corresponding to each key frame, and storing skeleton rotation data, corresponding to each key frame, of each skeleton node of the virtual object in the first storage table; constructing a second storage table corresponding to each key frame, and storing the skeleton identity identifier and the skeleton displacement data and / or the skeleton scaling data corresponding to at least one skeleton node subjected to displacement and / or scaling in the second storage table.
Owner:ZHUHAI KINGSOFT ONLINE GAME TECH CO LTD
Image compression method and device, electronic equipment and storage medium
ActiveCN113556543ASolve the speed problemSolve the low image compression ratioDigital video signal modificationImage compressionComputer vision
The embodiment of the invention discloses an image compression method and device, electronic equipment and a storage medium. The image compression method specifically comprises the steps of acquiring an image to be compressed; determining a target coding group of the to-be-compressed image, wherein the target coding group comprises a first coding method and a second coding method, and / or a third coding method and the second coding method; performing coding compression processing on the to-be-compressed image according to the first coding method and / or the third coding method in the target coding group to obtain a coding result parameters; and according to the second coding method in the target coding group, carrying out coding compression processing on the target coding result parameter in the coding result parameters again. According to the technical scheme provided by the embodiment of the invention, lossless compression of the image can be realized, the image compression rate and the image compression ratio are improved, and the image compression effect is further improved.
Owner:上海硕恩网络科技股份有限公司
Data compression method and device, terminal equipment and storage medium
ActiveCN111914045AReduce data volumeAchieve lossless compressionGeographical information databasesSpecial data processing applicationsComputer hardwareComputer graphics (images)
The embodiment of the invention is suitable for the technical field of data processing, and provides a data compression method and device, terminal equipment and a storage medium, and the method comprises the steps: collecting multi-beam data, and generating a grid map according to the multi-beam data, wherein the grid map comprises a plurality of grid points; calculating the depth value of each grid point, and dividing the grid map into a plurality of pixels according to the depth value of each grid point, wherein the grid depth values of the grids contained in the same pixel are the same; determining coded data of each pixel, wherein the coded data comprises a grid depth value of each grid in the pixel; merging the pixels with the same grid depth value to obtain a plurality of data blocks; and determining target coded data of each data block to complete compression of the multi-beam data. By adopting the method, lossless compression of the multi-beam data can be realized.
Owner:ZHUHAI YUNZHOU INTELLIGENCE TECH COMPANY +1
Time dimension compression method for hyperspectral atmospheric infrared remote sensing image
ActiveCN111050181AImplement image compressionAchieve lossless compressionColor/spectral properties measurementsDigital video signal modificationInfrared remote sensingImage compression
The invention discloses a time dimension compression method for a hyperspectral atmospheric infrared remote sensing image, and belongs to the technical field of remote sensing image compression. The hyperspectral atmospheric image compression method solves the problem that the existing hyperspectral atmospheric image compression method does not consider that the correlation rule between differenttime slices under large-range complex movement of the atmosphere is different from the correlation characteristic between high-frame-rate video frames, so that the image compression effect is poor. Based on the characteristic that hyperspectral infrared atmospheric image data detected by a detector in the same scene at different time have large correlation, a time dimension compression scheme of the hyperspectral infrared atmospheric image is designed based on an online learning prediction model. A prediction model from reference time slice images at different moments to a time slice image ata middle moment is established through a self-adaptive online updating prediction model, and prediction model parameters are updated in real time according to an online learning theory, so that multi-time slice image compression of hyperspectral data is realized, and the average compression ratio reaches 9.42. The inventioncan be applied to remote sensing image compression.
Owner:HARBIN INST OF TECH
Lossless compression method for large-format remote sensing image
ActiveCN110691242AImprove bit error resistance performanceIncrease lossless compression ratioDigital video signal modificationQuantization (image processing)Imaging processing
The invention discloses a lossless compression method for a large-format remote sensing image, and belongs to the field of image processing. The method comprises the following steps: dividing a large-format remote sensing image into independent coding regions which are not overlapped with each other; identifying the dynamic range of the pixel of each independent coding area, and determining the quantized bit number of the pixel; calculating a lossless compression parameter of each independent coding region according to the quantization bit number of each independent coding region; and according to the lossless compression parameter of each independent coding region, carrying out lossless compression on the independent coding region until lossless compression of the large-format remote sensing image is completed. According to the invention, a large-format remote sensing image is divided into a plurality of independent coding areas which are not overlapped with one another; the dynamic range of each independent coding area is identified as the local dynamic range of the large-format remote sensing image, the characteristic that the local dynamic range of the large-format remote sensing image is lower than the fixed dynamic range of the camera is effectively used, the overall lossless compression ratio is increased, compression parameters can be adjusted according to the local dynamic range, and lossless compression of the large-format remote sensing image is achieved.
Owner:HUAZHONG UNIV OF SCI & TECH
Digital image nondestructive compression method and device, resolution method and image encoder
InactiveCN101272442BAchieve lossless compressionSave storage spaceTelevision systemsDigital video signal modificationComputer graphics (images)Engineering
The invention relates to the lossless compression method of digital images. Whether a section of pixels is the continuous same or the discontinuous same is examined according to the adjacent pixels inthe spacial position in the image and is shown by flag bits. And the flag bits and step sizes are indicated by indicating bytes. If n continuous pixels are the same, one of the pointing byte is in front of the specific color value of one of the pixels; if n continuous pixels are different, the pointing byte is in front of the specific color value of the n pixels. The invention also provides the lossless compression device, the resolution method and the encoder of the digital images based on the method. The lossless compression method of the digital image has the advantages of high compressionrate, fast decompression speed, storage space saving performance and good real-time performance.
Owner:杭州波导软件有限公司
Hyperspectral image distributed compression method and system based on compressed sensing
ActiveCN110390699AEfficient compressionAchieve lossless compressionImage enhancementImage analysisCoding blockLossless compression
Owner:ARMY MEDICAL UNIV
Binary coding method based on mutual mapping of standard Euclidean space and plane space projection
PendingCN112052228AIncrease the compression ratioAchieve lossless compressionDigital data information retrievalCode conversionData streamAlgorithm
The invention provides a binary coding method based on a standard Euclidean space and plane space projection mutual conversion characteristic. Based on basic characteristics of standard Euclidean space and two-dimensional plane space projection, two-dimensional plane space projection and I-Ching Sixty-four diagrams and I-Ching Sixty-four diagrams and binary data mapping, a binary data stream spatialization algorithm is adopted to generate ordered binary data streams based on I-Ching Sixty-four diagrams. High-speed and high-compression-ratio dimension-increasing encoding and lossless dimension-reducing decoding of any computer file are achieved, and the problems that in the technical field of electronic information at present, due to the existence of information exchange standard codes, a traditional compression algorithm based on the information theory is not high in file compression ratio due to limitation of information entropy, and the compression speed is low and the problems of lossless compression are solved.
Owner:赵小章
A method and device for lossless compression system dependency graph
InactiveCN103902273BReduce overheadAchieve lossless compressionSpecific program execution arrangementsTheoretical computer scienceLossless compression
Embodiments of the present invention provide a method and device for lossless compression of a system dependency graph, which relate to the field of computers and can realize lossless compression of a system dependency graph and reduce the scale of the system dependency graph, thereby reducing the slicing algorithm based on the system dependency graph s expenses. The method is: first extract the equivalence relationship between all variables in the program, then divide all variables in the program into different equivalence classes through the equivalence relationship, and set the nodes in the system dependency graph according to these equivalence classes key value, and then compress the system dependency graph according to the key value of the node in the system dependency graph. The embodiment of the present invention is used to compress the system dependency graph.
Owner:HUAWEI TECH CO LTD +1
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