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34 results about "Rate–distortion theory" patented technology
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Rate–distortion theory is a major branch of information theory which provides the theoretical foundations for lossy data compression; it addresses the problem of determining the minimal number of bits per symbol, as measured by the rate R, that should be communicated over a channel, so that the source (input signal) can be approximately reconstructed at the receiver (output signal) without exceeding an expected distortion D.
Rate aberration optimizing frame refreshing and code rate distribution method for interested area
InactiveCN101198058AImprove subjective qualityHigh code rateTelevision systemsDigital video signal modificationAlgorithmVideo transmission
The invention discloses a probability distortion optimized intra refresh and code rate distribution method for interested regions. Firstly, end-to-end global distortion of video transmission under fallible environment is analyzed according to an end-to-end global distortion theory and comprises information source distortion and channel distortion; secondly, computing formula of the channel distortion is deduced and video coding lagrange cost function formula on the basis of the interested regions is obtained according to a probability distortion theory; thirdly, a weighting forecasting model of complexity of the prior macro block is obtained according to space-time relativity of macro blocks; fourthly, target code rate of the macro block is computed according to the complexity obtained after forecasting of the prior macro block and a region where the macro block is located; fifthly, the steps are repeated until coding of the prior frame is finished. The invention performs intra macro block refresh and code rate distribution according to interested regions to which human eyes pay attention and better subjective video image quality is obtained on a decoding end.
Owner:WUHAN UNIV
VVC interframe coding unit prediction mode early decision and block division early termination method
ActiveCN110087087ARemove redundant calculationsReduce computational complexityDigital video signal modificationComputation complexityComputer architecture
Owner:TONGJI UNIV
Transform domain based distortion cost estimation
InactiveUS7944965B2Color television with pulse code modulationColor television with bandwidth reductionRate distortionRate–distortion theory
Owner:SEIKO EPSON CORP
Image compression method and device for real-time code rate pre-distribution
InactiveCN102186076ASolve the technical flaw of heavy pressureSave storage spaceTelevision system detailsColor television detailsFpga implementationsCompression device
The invention discloses an image compression method and device for real-time code rate pre-distribution. The method comprises the steps of transform, code rate pre-distribution and entropy coding, wherein multilevel integer wavelet transform is adopted in the transform to remove related redundancy among original image pixels, to-be-contributed code rate of each sub band in actual coding is guidedby combining the rate distortion theory and the importance principle of each sub band of the transformed image on image reconstruction quality influence, and the final entropy coding is guided by using the pre-distributed code rate to realize real-time stop of the coding rate. The tasks of the method are divided in the compression device, the compression device comprises a field programmable gatearray (FPGA) and a digital signal processor (DSP), high-speed multilevel integer wavelet transform is realized by using the FPGA, and the transformed data are transmitted to the DSP through a high-speed serial input output (SRIO) module interface and are compressed and coded. By using the current most typical embedded architecture and combining the corresponding mathematical principle, the storage space of mass data is effectively saved, and the limited transmission bandwidth problem is solved.
Owner:INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
Method for optimizing rate distortion in video image compression
InactiveCN101521819AImprove compression performanceImprove evaluation accuracyPulse modulation television signal transmissionDigital video signal modificationRate distortionRate–distortion theory
The invention relates to the field of video image processing and provides a method for optimizing rate distortion in video image compression. The method comprises the following steps of A. carrying out transformation from spatial domain to frequency domain on the acquired image by a coder and generating frequency domain energy distribution after transformation; B. evaluating the optimizing value of the rate distortion by the coder according to coding input parameters and the frequency domain energy distribution; and C. controlling the coding compression of the image by the coder according to the optimizing value of the rate distortion. When estimating the rate distortion, compared with the prior art, the invention is characterized in that evaluation parameters are introduced into the coding input parameters and the frequency domain energy distribution after transformation at the same time, thus evaluating the optimizing value of the rate distortion according to the evaluation parameters, improving the evaluation precision and further enhancing the image compression performance.
Owner:SHENZHEN TEMOBI SCI &TECH
Method And Apparatus For The Digitization Of And For The Data Compression Of Analog Signals
ActiveUS20070211804A1Quality improvementFavorable packing characteristicSpeech analysisAnalogue-digital convertersEngineeringMulti dimensional
The invention is based on the idea of providing a method for high-resolution, waveform-preserving digitization of analog signals, wherein conventional scalar logarithmic quantization is transferred to multi-dimensional spherical coordinates, and the advantages resulting from this, e.g., a constant signal / noise ratio over an extremely high dynamic range with very low loss with respect to the rate-distortion theory. In order to make use of the statistical dependencies present in the source signal for an additional gain in the signal / noise ratio, the differential pulse code modulation (DPCM) is combined with spherical logarithmic quantization. The resulting method achieves an effective data reduction with a high long-term and short-term signal / noise ratio with an extremely small signal delay.
Owner:SENNHEISER ELECTRONICS GMBH & CO KG +1
Screen content coding inter-frame fast algorithm based on rate distortion cost
ActiveCN109302610AReduce complexityReduce traversalDigital video signal modificationObjective qualityRate distortion
The invention relates to the technical field of video coding and decoding, in particular to an SCC inter-frame fast algorithm based on rate distortion cost. The algorithm comprises the following stepsof firstly, predicting whether a current coding unit needs to be divided according to depth information of the adjacent coding unit in the time-space domain and average rate distortion cost of the adjacent coding unit in order to carry out early decision on division of the coding unit to reduce unnecessary traversing; and secondly, carrying out early termination on a prediction unit mode selection process according to an average rate distortion cost value with a merge mode as the optimal prediction unit mode. According to the algorithm, the coding complexity is effectively reduced under a condition that the objective quality is almost unchanged.
Owner:CHONGQING UNIV OF POSTS & TELECOMM
Optimization method for sensing rate distortion
InactiveCN104994382AReduce occupancySave storage spaceDigital video signal modificationImaging processingRate distortion
The invention discloses an optimization method for sensing rate distortion, belonging to the image processing field. The optimization method comprises obtaining the integrated threshold of frame images in an original video; determining zoom factors in the frame images; and determining initial multipliers in the frame images in dependence on the zoom factors. In the frame images, the integrated threshold of a MacroBlock (MB) including a preset number of pixel points is determined, and the affiliation category of the MB is determined in combination with the integrated threshold of the frame images. In dependence on a distortion model and the affiliation category of the MB, quantization parameters of the MB in the frame images are obtained, and adjusting multipliers of the MB in the frame images are obtained in combination with the rate distortion theory; an optimal solution of a coding cost function is obtained in dependence on the adjusting multipliers and in combination with the distortion model. The method can determine a video coding mode corresponding with the optimal solution, provide convenience for realizing high quality video experience based on the video coding mode, and meanwhile guarantee that a video occupies a smaller storage space.
Owner:XIDIAN UNIV
Video-frequency encoding-rate controlling method
InactiveCN1816141AImprove encoding qualityImprove rate-distortion performancePulse modulation television signal transmissionPattern recognitionVideo encoding
Main points of the invention are as following: using rate distortion theory of message source of possessing statistic characteristics of Laplace distribution to build secondary rate distortion model; using secondary rate distortion model to control video encoding rate. Secondary rate distortion model built in the invention is better accorded with real characteristics of rate distortion of video message source. The invention makes encoding output rate of video sequence closer to given channel bandwidth. The invention raises accuracy for controlling video encoding rate, and raises video encoding quality. Advantages are: better performance of rate distortion, applicable to real time multimedia communication and stream media through network.
Owner:SNAPTRACK
HEVC complexity control method based on coding unit hierarchy and rate distortion cost
ActiveCN106231301AImprove dynamic rangeSmall local fluctuationsDigital video signal modificationRate distortionTheoretical computer science
The invention provides an HEVC complexity control method based on a coding unit hierarchy and rate distortion cost. The HEVC complexity control method comprises steps that a user sets a video coding target complexity coefficient; the complexity of each coding unit hierarchy in the first GOP is counted, the complexity ratio of the coding unit hierarchies is calculated and by combining the different coding unit hierarchies, different thresholds are obtained; and a target complexity is equally distributed in each frame in a to-be-coded GOP, the complexity is equally distributed to coding tree units, the number of two continuous coding unit hierarchies is selected according to the distributed complexity and the number and the position of each coding unit hierarchy is determined. According to the HEVC complexity control method, by considering the coding unit hierarchies and the rate distortion cost, introduction of additional complexity is avoided in the whole method; a special training video sequence is not required; any video can be directly coded; and effective control on the complexity is achieved in a certain range in the GOP level.
Owner:SHANGHAI JIAO TONG UNIV
Intelligent inter-viewpoint coding method
ActiveCN110557646AReduce residualReduce bit overheadDigital video signal modificationSteroscopic systemsParallaxCoding block
The invention discloses an intelligent inter-viewpoint coding method. The method comprises the following steps: respectively obtaining a first prediction block obtained based on an adjacent block parallax vector mode and a second prediction block obtained based on a traditional parallax compensation prediction mode; constructing a residual learning convolutional neural network structure with a variable convolution kernel size; taking a result obtained by cascading the brightness component channels of the two prediction blocks as the input of a convolutional neural network, wherein the output of the network is an enhanced prediction block of the original image block; training four different network models according to the four different quantization parameters; extracting brightness components of the first prediction block and the second prediction block respectively, performing channel cascading, and calling a corresponding network model for a result after cascading according to the size of the current coding block and the quantization parameter value; and finally, calculating the rate distortion cost of the enhanced prediction block, comparing the rate distortion cost with the optimal mode cost of the current coding block; if the rate distortion cost is less than the optimal mode cost, selecting the method as the optimal coding mode, coding the corresponding mark, and transmitting the coded mark to a decoding end.
Owner:TIANJIN UNIV
Method for rapidly selecting multi-view video coding modes based on rate distortion sensitivity
ActiveCN102404570AImprove rate-distortion performanceReduce computational complexityTelevision systemsDigital video signal modificationComputer architectureRate distortion
The invention discloses a method for rapidly selecting multi-view video coding modes based on rate distortion sensitivity, which comprises the following steps of: (1) inputting one frame of multi-view video data; (2) selecting a reference frame of the rate distortion cost and calculating an average value of the rate distortion cost with modified quantification steps; (3) estimating the large-size inter-frame modes of a macroblock; (4) calculating the rate distortion sensitivity of the macroblock; (5) selecting the small-size inter-frame modes estimation of the macroblock; (6) selecting the intra-frame mode estimation of the macroblock; and (7) selecting the final coding mode of the macroblock. The method disclosed by the invention is applicable for selection of the multi-view video coding macroblock coding modes, and capable of reducing the whole calculating amount of the multi-view video coding and maintaining the coding rate distortion property at the same time.
Owner:ZHEJIANG UNIV OF TECH
Lagrange factor computing method oriented to intra-frame code rate control
InactiveCN108737839AImprove accuracyImprove coding efficiencyDigital video signal modificationRate distortionAlgorithm
The invention discloses a Lagrange factor computing method oriented to intra-frame code rate control. The method comprises the following steps: deriving the Lagrange factor LambdaSSE based on the SSEin the code rate control in combination with the Lagrange optimization according to the intra-frame distortion propagation feature; deriving a distortion propagation model according to the intra-frameprediction coding principle since the space between the reference pixel and the prediction pixel can be described as a one-dimension Gaussian Markov model, and computing the distortion propagation parameter alpha; and meanwhile, acquiring the original Lagrange factor Lambda by using the code rate control principle. Through the method disclosed by the invention, the Lagrange factor LambdaSSE can be acquired by computing the parameters Alpha and Lambda, the method has low coding complexity, and is only the 0.1% of the existing algorithm; and the Lagrange factor LambdaSSE under the intra-frame code rate control obtained from the rate distortion principle has high accuracy.
Owner:XIAN UNIV OF TECH
Method and apparatus for the digitization of and for the data compression of analog signals
InactiveUS7979273B2Quality improvementFavorable packing characteristicSpeech analysisAnalogue-digital convertersEngineeringSignal-to-quantization-noise ratio
The invention is based on the idea of providing a method for high-resolution, waveform-preserving digitization of analog signals, wherein conventional scalar logarithmic quantization is transferred to multi-dimensional spherical coordinates, and the advantages resulting from this, e.g., a constant signal / noise ratio over an extremely high dynamic range with very low loss with respect to the rate-distortion theory. In order to make use of the statistical dependencies present in the source signal for an additional gain in the signal / noise ratio, the differential pulse code modulation (DPCM) is combined with spherical logarithmic quantization. The resulting method achieves an effective data reduction with a high long-term and short-term signal / noise ratio with an extremely small signal delay.
Owner:SENNHEISER ELECTRONICS GMBH & CO KG +1
Encoding method and device
ActiveCN109660806AReduce bit rateGuaranteed coding qualityDigital video signal modificationLossless codingRate distortion
The embodiment of the invention provides an encoding method and device. The method comprises the following steps: acquiring a first rate distortion cost and encoding mode information obtained by encoding a first image block in a first path of video, and encoding a second image block in a second path of video by using the encoding mode information to obtain a second rate distortion cost; and when the second rate distortion cost is not larger than a rate distortion threshold, determining that encoding of the second image block is finished. In the scheme, the encoding mode information and first rate distortion value of the first image block are acquired from the first path of encoded video, the second image block in the second path of video is encoded with the encoding mode information, and other encoding modes are not selected any more under the situation that the second rate distortion cost is not larger than the rate distortion threshold, so that the overall encoding time is shortened.Compared with lossless encoding, the code rate for encoding the second path of video in the scheme is lower, and the compression efficiency is improved.
Owner:上海众源网络有限公司
TU tree structure decision algorithm based on HEVC video coding
ActiveCN107277521AReduce overheadReduce the number of seriesDigital video signal modificationRate distortionResidual coding
The invention discloses a TU tree structure decision algorithm based on HEVC video coding, comprising the following steps of (a) transforming TU residuals to obtain a coefficient C0 before quantization; (b) quantifying C0 obtained in step (a) to obtain a coefficient C1; (c) using a fixed binary Bin and a bits compression ratio to obtain an estimate value of the number of bits; (d) dequantizing C1 obtained in step (b) to obtain a coefficient C2; (e) calculating a distortion value of the TU; (f) calculating the rate distortion cost after the TU residual coding; (g) calculating the rate distortion cost of the TU residual without any coding; and (h) comparing the rate distortion cost obtained in the step (g) with the rate distortion cost obtained in the step (f), and taking the rate distortion cost of a smaller value as the best price of this TU. The invention adopts the above algorithm, which can reduce the complexity of the calculation, reduce the hardware overhead, and improve the hardware performance.
Owner:芯原微电子(北京)有限公司 +2
Data processing system and data processing method for mining television viewing modes
ActiveCN103425698AEasy to watchImprove service qualitySpecial data processing applicationsData processing systemQuality of service
The invention discloses a data processing system and a data processing method for mining television viewing modes. The problem of mining user viewing modes hidden under a user viewing history is mapped to be the problem of optimizing a usable rate distortion theory; by giving the user viewing history, the user viewing modes can be efficiently found out, and distortion rate between data reconstructed by the user viewing modes and original data is ensured to be minimum, so that convenience is brought to a user for viewing television programs, service quality of television products is improved, and popularization of the products is facilitated.
Owner:TCL CORPORATION
3D video depth image prediction mode selection method based on viewpoint correlation
ActiveCN107071479ABroaden research directionReduce coding complexityDigital video signal modificationCoding blockRound complexity
The invention discloses a 3D video depth image prediction mode selection method based on the viewpoint correlation. The method comprises the steps of: preliminarily judging the possibility that a current coding block selects the Skip mode by utilizing the viewpoint correlation at first; and then, for the coding block having high possibility, comparing the rate distortion RD-cost of the Skip mode with the rate distortion RD-cost of the 2N*2N Merge mode and the DIS mode, determining whether the current block selects the Skip mode or not, and ending a prediction mode selection process in advance. By means of the 3D video depth image prediction mode selection method based on the viewpoint correlation disclosed by the invention, the depth image prediction coding complexity can be reduced; the coding time required by prediction can be reduced; and furthermore, the video quality in the synthesis visual angle of the final decoding end can be ensured.
Owner:NANJING UNIV OF SCI & TECH
Rate distortion optimization-based video coding rapid search method in GPU
ActiveCN110113608AQuality assuranceReduce computational complexityDigital video signal modificationComputation complexityRate distortion
The invention relates to a rate distortion optimization-based video coding rapid search method in GPU. The method comprises a 64 * 64 PU searching step, other PU searching steps and a fractional pixelsearching step. The method is applied to 64 * 64 PU search and other PU search. Two-step search based on rate distortion optimization is provided for different sizes of PUs; first, obtaining an optimal matching position, calculating rate distortion cost corresponding to the MV, the PMV and the SAD by using a rate distortion cost calculation method, storing the rate distortion cost into Shard Memory, calculating minimum cost by using an iterative algorithm, and storing the minimum cost, the SAD and MV corresponding to the minimum cost into the Global Memory. Compared with the prior art, the method has the advantages that the calculation complexity is reduced, and the calculation time is greatly shortened.
Owner:SHANGHAI UNIVERSITY OF ELECTRIC POWER
Incremental rate distortion optimization method based on free viewpoint video depth map coding
ActiveCN105141956AAvoid repeated executionReduce computational complexityDigital video signal modificationViewpointsRate distortion
The invention relates to an incremental rate distortion optimization method based on free viewpoint video depth map coding. The incremental rate distortion optimization method comprises the following steps: (1), trying to code a depth map block by adopting a certain coding mode so as to obtain a bit number cost, eliminating the mode if the bit number cost is more than a minimal rate distortion cost Jmin, and or else, entering a step (2); (2), calculating distortion of the depth map block, summing the distortion and the bit number cost after weighing so as to obtain a temporary rate distortion cost, eliminating the mode if the temporary rate distortion cost is more than the Jmin, and or else, entering a step (3); (3), entering a synthetic virtual viewpoint cycle, summing distortion of one virtual viewpoint obtained every time and the original rate distribution cost after weighing, stopping calculation of the rate distortion cost in the mode if the sum is more than the Jmin, and or else, continuously calculating distortion of a next virtual viewpoint; and (4), eliminating the mode if the obtained distortion is more than Jmin after all virtual viewpoints are synthesized, and or else, selecting the mode as the optimal mode.
Owner:西安迪威码半导体有限公司
A Calculation Method of Lagrangian Factor Oriented to SATD
InactiveCN106534855BImprove accuracyImprove coding efficiencyDigital video signal modificationAlgorithmRate distortion
The invention discloses a Lagrange factor calculation method for SATD. According to a rate distortion model of an encoder of limited entropy scalar quantization under a high-code-rate condition, an SSE-based Lagrange factor lambda mode is derived; Hadamard transformation has a feature of energy concentration, energy is mainly concentrated at the top left corner of a two-dimensional matrix, since the Hadamard transformation has similar features with DCT, Hadamard transformation residual errors are also described to be in Gauss distribution; and under the condition that a distortion measure is the SATD, the rate distortion model is obtained, and accordingly, a Lagrange factor lambda pre for the SATD is obtained. According to the invention, the Lagrange factor lambda pre is obtained through calculating parameters delta and delta h, the encoding complexity is quite low, and the encoding complexity is only 1% of that of a conventional algorithm; and the Lagrange factor lambda pre under the distortion measure SATD is obtained from the angle of a rate distortion theory, and the accuracy is high.
Owner:XIAN UNIV OF TECH
Fast selection method of hevc intra coding unit
InactiveCN102917225BImprove encoding speedEliminate the step of comparing the encoding rate distortion cost one by oneDigital video signal modificationTemplate matchingRate distortion
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Data processing system and method for mining TV viewing patterns
ActiveCN103425698BEasy to watchImprove service qualitySpecial data processing applicationsData processing systemOriginal data
The invention discloses a data processing system and a data processing method for mining television viewing modes. The problem of mining user viewing modes hidden under a user viewing history is mapped to be the problem of optimizing a usable rate distortion theory; by giving the user viewing history, the user viewing modes can be efficiently found out, and distortion rate between data reconstructed by the user viewing modes and original data is ensured to be minimum, so that convenience is brought to a user for viewing television programs, service quality of television products is improved, and popularization of the products is facilitated.
Owner:TCL CORPORATION
A three-dimensional video rate-distortion optimization method and optimization device
ActiveCN103139554BUnlock the full potential of rate-distortion performanceImprove rate-distortion performanceDigital video signal modificationSteroscopic systemsVideo rateFully developed
The invention discloses a method for optimizing a three-dimensional video frequency distortion. The method comprises the steps of (1) using texture information and supplementary information together to calculate a joint code rate; (2) using the texture information and the supplementary information together to calculate the joint distortion; and (3) using the joint code rate and the joint distortion to calculate joint rate distortion cost, wherein the joint rate distortion cost is used for joint encoding of the texture information and the supplementary information or is used for coding of the supplementary information. The invention also discloses a device for optimizing the three-dimensional video frequency distortion. According to the method and the device, the texture information and the supplementary information in a three-dimensional video is combined to optimize the rate distortion, the rate distortion performance potential in the texture information and the supplementary information is fully developed, the rate distortion performance of three-dimensional video compression is improved, and the method and the device are wide in application filed and adaptability.
Owner:ZHEJIANG UNIV
Rate aberration optimizing frame refreshing and code rate distribution method for interested area
InactiveCN100574441CImprove subjective qualityHigh code rateTelevision systemsDigital video signal modificationAlgorithmVideo transmission
The invention discloses a probability distortion optimized intra refresh and code rate distribution method for interested regions. Firstly, end-to-end global distortion of video transmission under fallible environment is analyzed according to an end-to-end global distortion theory and comprises information source distortion and channel distortion; secondly, computing formula of the channel distortion is deduced and video coding lagrange cost function formula on the basis of the interested regions is obtained according to a probability distortion theory; thirdly, a weighting forecasting model of complexity of the prior macro block is obtained according to space-time relativity of macro blocks; fourthly, target code rate of the macro block is computed according to the complexity obtained after forecasting of the prior macro block and a region where the macro block is located; fifthly, the steps are repeated until coding of the prior frame is finished. The invention performs intra macro block refresh and code rate distribution according to interested regions to which human eyes pay attention and better subjective video image quality is obtained on a decoding end.
Owner:WUHAN UNIV
Speedup techniques for rate distortion optimized quantization
Techniques for selecting a coding mode for an image coding process are described. Coding modes can be selected through a coding mode transition state machine, a re-quantization process, selection of an optimal transform size, by skipping some quantization parameters, or by performing motion search.
Owner:GUANGDONG OPPO MOBILE TELECOMM CORP LTD
Video-frequency encoding-rate controlling method
InactiveCN100505874CImprove encoding qualityImprove rate-distortion performancePulse modulation television signal transmissionPattern recognitionThe Internet
The present invention provides a method for video coding rate control, the core of which is: establish a secondary rate-distortion model according to the rate-distortion theory of a source with Laplace distribution statistical characteristics, and perform video coding according to the secondary rate-distortion model rate control. The secondary rate-distortion model established by the present invention is more in line with the rate-distortion characteristics of the real video source, and the present invention can make the encoding output rate of the video sequence closer to the given channel bandwidth, and has good rate-distortion performance, which can Widely used in network real-time multimedia communication, network streaming media and other applications; thereby achieving the purpose of improving the accuracy of video encoding rate control and improving video encoding quality.
Owner:SNAPTRACK
Method for rapidly selecting multi-view video coding modes based on rate distortion sensitivity
ActiveCN102404570BImprove rate-distortion performanceReduce computational complexityDigital video signal modificationComputer architectureRate distortion
The invention discloses a method for rapidly selecting multi-view video coding modes based on rate distortion sensitivity, which comprises the following steps of: (1) inputting one frame of multi-view video data; (2) selecting a reference frame of the rate distortion cost and calculating an average value of the rate distortion cost with modified quantification steps; (3) estimating the large-size inter-frame modes of a macroblock; (4) calculating the rate distortion sensitivity of the macroblock; (5) selecting the small-size inter-frame modes estimation of the macroblock; (6) selecting the intra-frame mode estimation of the macroblock; and (7) selecting the final coding mode of the macroblock. The method disclosed by the invention is applicable for selection of the multi-view video coding macroblock coding modes, and capable of reducing the whole calculating amount of the multi-view video coding and maintaining the coding rate distortion property at the same time.
Owner:ZHEJIANG UNIV OF TECH
Video encoding method
InactiveCN103096076BImprove viewing effectConsistent with visual distortion perceptionDigital video signal modificationRelational modelVideo encoding
The invention provides a video encoding method. The video encoding method comprises respectively determining rate distortion cost of at least two kinds of encoding modes, and choosing an encoding mode according to the rate distortion cost, wherein the operation of determining the rate distortion cost comprises acquiring macro block distortion quantity according to space-time similarity measurement between an original macro block and a reconstructed macro block in a video, acquiring a Lagrange multiplier according to a relation model of an encoding rate and the macro block distortion quantity, and determining corresponding rate distortion cost of the encoding mode according to the encoding rate, the macro block distortion quantity and the Lagrange multiplier. Due to the facts that the macro block distortion quantity determined by the video encoding method conforms to visual distortion sensitivity of human eyes and the Lagrange multiplier is acquired through accurate relation model, so that the rate distortion cost determined can truly reflect whether the encoding mode is suitable for a current video frame of a video sequence or not, therefore the encoding mode suitable for the video can be determined accurately, and watching effect of the video after the encoding is used is in a good status.
Owner:GRADUATE SCHOOL OF THE CHINESE ACAD OF SCI GSCAS
Quantization and code stream control method for image compressing transmission
InactiveCN1193616CImproved subjective quality assessmentSimple methodImage codingTelevision systemsImage transferImage compression
The present invention disclosed quantization and code steam control method for image compressing transmission in video communication field. The said method combines buffering area quantizing parameter control and predistortion theory and considers the visual features of human eye in time domain and space domain. The image of different property is predistorted in different mode, and through the two steps of frame level quantizing parameter control and macroblock level quantizing parameter control, high image compressing quality is provided in the condition of smooth code rate control. In addition, it is possible to avoid the lag of code stream control and raise code stream control effect.
Owner:ZTE CORP
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