42results about How to "Reduced compression efficiency" patented technology

Disclosed are a system and method for encoding and decoding an image. The image compression system includes an image segmentation unit (110) for segmenting a first image into a plurality of sub-images; a first encoding unit (120) for encoding the sub-images to output sub-image bitstreams; a BMAP construction unit (130) for calculating the quantity of information of each sub-image bitstream and generating BMAP information using the calculated quantity of information and information on construction of each sub-image; and a bitstream combining unit (150) for combining the sub-image bitstreams and BMAP information.

The invention relates to an OpenFlow flow table memory space compression method. The method includes the steps of analyzing the structural features of OpenFlow flow tables, carrying out classification on the OpenFlow flow tables according to the collision relation and coexistence relation of flow table item fields, dividing initial flow table items in different classes to be stored and converting a flow table which is large in scale and complex in structure into a plurality of flow tables which are smaller in scale and simple in structure, in addition, setting a dynamic adjusting threshold value according to the frequent and fast updating features of the OpenFlow flow tables, and optimizing a flow table memory space by carrying out splitting or merging operation on the existing classes. The OpenFlow flow table memory space compression method can effectively reduce the flow table memory space, adapt to the dynamic and fast updating of the OpenFlow flow tables and enable the compression ratio of the flow table memory space to be stabilized by around 70%, and therefore the memory compression ratio similar to that of the best method by using less running time can be achieved.

What disclosed is to form an abrasive coating having abrasiveness at a blade pressure side of a deposition layer using a second electrode composed of a second molded body molded from a mixed powder including a powder of a metal and a powder of a ceramic or the second electrode processed with a heat treatment, generating pulsing electric discharges between the blade pressure side of the deposition layer and the second electrode in an electrically insulating liquid or gas, and welding a material of the second electrode or a reacting substance of the material of the second electrode on the blade pressure side of the deposition layer by means of energy of the electric discharges.

An image decoder splits a block of a picture into a plurality of sub blocks in a first direction using a first partition mode; and decodes the plurality of sub blocks, wherein, when the block is sized N pixels by 2N pixels and the first direction is along the 2N pixels, N being an integer, the first partition mode includes splitting the block into the plurality of sub blocks including at least one sub block sized N / 4 pixels by 2N pixels, and excludes splitting the block into two sub blocks sized N / 2 pixels by 2N pixels.

The invention discloses a multi-cylinder rotary type compressor. A motor and a compression mechanism are arranged in sealed shell; the compression mechanism comprises a first cylinder with a first piston, a second cylinder with a second piston and a middle isolation plate positioned between the first cylinder and the second cylinder; an eccentric crank shaft drives the first piston and the second piston to rotate at the same time; a main bearing and an auxiliary bearing which are used for supporting the eccentric crank shaft are respectively arranged on the side face of the first cylinder and the side face of the second cylinder; the eccentric crank shaft comprises a main shaft, a first eccentric shaft connected with the first piston, a second eccentric shaft connected with the second piston and an auxiliary shaft; the first eccentric shaft is connected with the second eccentric shaft through a connection shaft; a middle shaft is arranged in the connection shaft; and a middle bearing for supporting the middle shaft is arranged in the middle isolation plate. The multi-cylinder rotary type compressor is suitable for double-cylinder rotary type compressors and three-cylinder or multi-cylinder rotary type compressors and has the characteristics of simple and rational structure, flexibility in operation, high efficiency ratio and wide application range.

The invention proposes a visual perception correction image compression method based on DCT transform. The method is used for lossy compression of an image, and comprises the following steps: firstly, converting the image into a Ycrcb format via domain space transformation; secondly, decomposing the image into 8x8 image subblocks, and performing DCT transform on each image subblock; thirdly, in a DCT coefficient of each subblock, processing the coefficient through a judgment method and then decomposing the coefficient into a high frequency coefficient and a low frequency coefficient, wherein an error compensation mechanism is adopted for the high efficiency coefficient and visual perception correction transformation is performed on the low frequency coefficient, and then encoding; and finally, the process of reconstructing the image is an inverse operation of the compression process. Through the method of the invention, the image can not only get a higher compression ratio, but also the compression efficiency of the image is not reduced due to the increase of the amount of calculation; and meanwhile, the reconstructed image is analyzed, the image restoration degree is increased, the signal to noise ratio is enhanced, and the image restoration quality is obviously improved, therefore, the visual perception correction image compression method based on the DCT transform provided by the invention has strong practicability.

The invention discloses a video lossless compression method based on adaptive model selection. The method comprises the following steps: judging the type of an input video, determining operand, performing video pre-processing operation; adopting the airspace redundancy-removing method, the time domain redundancy-removing method and the direct mode redundancy-removing method to perform redundancy-removing operation to the current sample and obtain the predictive value of the current sample; utilizing the redundant information of space, time and frequency domain to separately perform infraframe prediction and interframe prediction to the original YUV sequence; if the original sequence is RGB sequence, performing infraframe prediction, interframe prediction and direct prediction to the converted sequence; using an adaptive prediction model selector to judge the predictive value of the current sample and determine that the minimum is the optimal prediction error; and finally performing context-based arithmetic encoding to the map value of the final prediction error and outputting to obtain bit stream. The invention uses the adaptive prediction model selector to replace the additional bit prediction model, thus obviously increasing the compression efficiency of video; and the method can be used for video compression in the fields of aviation and navigation.

The invention discloses an air compressor, especially to an air compressor which can reduce resistance of reciprocating motion of a compressor in a cylinder chamber so as to increase air compressing efficiency. The air compressor is in connection with a cover body with a section diameter greater than that of a cylinder at the periphery of a drum cylinder chamber. The top height of the cover body is greater than the top wall of the cylinder. An expanded chamber is formed between the cylinder chamber outer circumferential wall and the cover body so as to reduce resistance of reciprocating motion of a compressor in the cylinder chamber and increase pushing speed so as to greatly increase air compression efficiency.

The invention discloses a scroll compressor, comprising: a fixed volute fixed in place and having a spiral wall body provided on one side surface of an end plate; and a spiral wall body provided on one side surface of an end plate (13a). A surrounding volute (13) of the wall body (13b), which is supported by the joining of the walls so as to circle and revolve around the fixed volute without rotating. When the length of the wall (13b) outward than the stepped portion (43) provided on the end plate (13a) is represented by H, and the height difference of the stepped portion (43) is represented by L, L / H is 0.2 or smaller.

The invention relates to a gas turbine (1) which comprises a compressor (2), a central housing (12), at least one combustion chamber (28), an expansion turbine (26), and a heat exchanger (68). Each combustion chamber (28) is fluidically connected to the expansion turbine (26) via an inner housing (24) which is guided through the interior (10) of the central housing (12). The compressor (2) is fluidically separated from the interior (10) of the central housing (12) by an annular collection chamber (16) which is connected to an outlet (8) of the compressor (2) and which has a number of discharge lines (20) which are connected to the cold side (72) of the heat exchanger (68) during operation. Each combustion chamber is designed as a silo combustion chamber (22), and each silo combustion chamber (28) has an inner wall (30), which delimits a combustion chamber (34), and an outer wall (40), and the outer wall (40) surrounds the inner wall (30), thereby forming a cavity (38). The inner wall (30) transitions into the inner housing (24), and the cavity (38) transitions into the interior (10) of the central housing (12).

A method for editing spliced-together video comprising a cut-out sequence followed by a cut-in sequence, both being in 3:2 pull-down format. A bad edit is detected, and either a number of contiguous frames at the end of the cut-out sequence and / or a number of contiguous frames at the beginning of the cut-in sequence are deleted in order that the 3:2 pull-down sequence is preserved in the spliced-together video. Alternatively, a first number of frames at the end of the cut-out sequence and / or a second number of frames at the beginning of the cut-in sequence are copied / renamed and inserted from other fields in order that the pull-down format is preserved in the spliced-together video.

The invention discloses an ultra-short pulse laser space-time compression method based on a flight focus and a plasma waveguide, and belongs to the technical field of laser. The method adopts the plasma waveguide to collect and collimate the flight focus, enables focused laser to be transmitted in the plasma waveguide, and then adjusts the moving speed of the flight focus to be just equal to the group speed of the laser in the waveguide through a grating. Due to the fact that light paths of light with different wavelengths are different, output pulses obtain a time compression effect, and meanwhile, due to the self-focusing effect of strong laser in plasma, the laser is further focused, and a space compression effect is achieved. The invention solves the problems of material damage of theexisting chirped pulse amplification technology and low stability, low efficiency and the like of the plasma compression technology.

The present invention provides a shaft combination structure of gear compressor. It includes the following several portions: cylinder, outside gear, inside gear, upper bearing, lower bearing and rotary shaft. On the described inside gear a shaft inserting hole is set, and on the described rotary shaft a combination portion is set, said combination portion is inserted into the shaft inserting hole of inside gear and can be used for transferring the rotation force of the rotary shaft to the inside gear, and said combination portion only can be moved towards one side direction of inside gear shaft inserting hole. Said structure can implement accurate contact between inside gear and outside gear, can inhibit leakage of compressed air and can raise compression efficiency.

The present invention provides a method and a device for compressing non-constant amplitude domain data. The method determines whether a small load event is in an ascending load event or a descending load event in the rain flow counting statistics. If the small load event is a small load event in the ascending load event and the small load event is smaller than a minimum stress range, a half cycle of the period in which the small load event is counted in the rain flow counting statistics is removed. If the small load event is a light load event in the descending load event and the product of the small load event and the empirical parameter is less than the minimum stress range, a half cycle of the period in which the small load event is counted in the rain flow counting statistics is removed. The non-constant amplitude data compression of different load events is realized. Under the premise of fatigue damage equivalence, the compression efficiency is improved and the test period is shortened.

The outer peripheral surface of a swing piston (28) is formed in a non-circular form. The inner peripheral surface of a cylinder chamber (25) is formed on a basis of an envelope curve of the outer peripheral surface of the swing piston (28) obtained at the time of its swing. The outer peripheral surface of the swing piston (28) and the inner peripheral surface of the cylinder chamber (25) are formed in, e.g., an ovoid shape so that as compared to the case in which such inner and outer peripheral surfaces are formed in a circular form, a shorter compression cycle and a longer discharge cycle can be obtained at the time of swing of the swing piston (28). As a result, an overcompression loss when a refrigerant is discharged in a swing compressor can be reduced.

A cylinder (60) on the moving side is connected via an eccentric section (25) to a drive shaft (23) supported by a main bearing (45). On the other hand, an annular piston (43) on the stationary side is formed at a front head (40) integrally with the main bearing (45).

The invention provides an efficient compression system for realizing air separation, which comprises a gas compressor, an air inlet channel arranged at an air inlet of the gas compressor, and at least two air filtering devices communicated with the air inlet channel, and a control valve is arranged between each air filtering device and the air inlet. The air purifier further comprises a control device, a humidity detection device used for detecting environment humidity and a tiny dust detection device arranged on the air inlet channel, the control device is used for obtaining detection values of the humidity detection device and the tiny dust detection device so as to control opening and closing of the control valve, and replacement of the air filtering device can be directly controlled according to the content of tiny dust in the air inlet channel. According to the air compressor, dust is prevented from being excessively attached to blades of the air compressor, the influence that the compression efficiency is reduced due to the fact that the dust is attached to the blades can be reduced, the compression efficiency of the compression system is improved, the air filtering device does not need to be cleaned and shut down at the same time through the method of directly switching the air filtering device, and the compression efficiency is further improved.

The invention discloses an efficient energy-saving air compressor. The efficient energy-saving air compressor comprises a bucket; the bucket is horizontally arranged on the ground, a rear wheel rod is welded to the bottom of the bucket, and rear wheels are connected to the two ends of the rear wheel rod through bearings; a front wheel rod is perpendicularly welded to the end, away from the rear wheel rod, of the bottom of the bucket; a front wheel is connected to the end, away from the bucket, of the front wheel rod through a bearing; a motor, a turbine machine and a compressor body are sequentially welded to the top of the bucket; a spindle is arranged on the motor and sleeved with a belt wheel through a thread; a main shaft is arranged on the turbine machine and sleeved with a first belt wheel through a thread; the compressor body is provided with an air inlet and an air outlet; the belt wheel, the first belt wheel and a second belt wheel are all concavely connected through a belt; and the air inlet of the compressor body is sleeved with the end, away from the turbine machine, of an air outlet pipe. The efficient energy-saving air compressor has the advantages that the compression efficiency is improved, the service life is prolonged, and the using risk is reduced.

The invention discloses a multi-cylinder rotary type compressor. A motor and a compression mechanism are arranged in sealed shell; the compression mechanism comprises a first cylinder with a first piston, a second cylinder with a second piston and a middle isolation plate positioned between the first cylinder and the second cylinder; an eccentric crank shaft drives the first piston and the second piston to rotate at the same time; a main bearing and an auxiliary bearing which are used for supporting the eccentric crank shaft are respectively arranged on the side face of the first cylinder and the side face of the second cylinder; the eccentric crank shaft comprises a main shaft, a first eccentric shaft connected with the first piston, a second eccentric shaft connected with the second piston and an auxiliary shaft; the first eccentric shaft is connected with the second eccentric shaft through a connection shaft; a middle shaft is arranged in the connection shaft; and a middle bearing for supporting the middle shaft is arranged in the middle isolation plate. The multi-cylinder rotary type compressor is suitable for double-cylinder rotary type compressors and three-cylinder or multi-cylinder rotary type compressors and has the characteristics of simple and rational structure, flexibility in operation, high efficiency ratio and wide application range.

The invention discloses a method and device for transmitting and receiving timestamp information, wherein the method comprises the following steps: determining, when the timestamp information of a current data packet is the same as the timestamp information of a previous packet, whether the number of the same timestamp times reaches a preset number of times; and if yes, transmitting the timestamp information at a zero bit when receiving the timestamp information the same as the timestamp information of the previous packet again. The method determines whether the two adjacent pieces of timestamp information is the same or not and transmits the next same timestamp information at the zero bit if yes. The method transmits the timestamp at the zero bit, is faster in time compression, obviously increases processing speed, and solves a problem that TS_STRIDE can only be 0 and only an original value is transmitted in the case of the same timestamp in two adjacent data packages in the prior art, thereby causing low compression efficiency.

An encoding device 1 includes: a transformer 13 configured to calculate an orthogonal transform coefficient by performing an orthogonal transformation process on a residual image indicating a difference between the input image and a predicted image of the input image; a quantizer 14 configured to generate quantization coefficient by quantizing the orthogonal transform coefficient based on a quantization parameter; an entropy encoder 24 configured to generate encoded data by encoding the quantization coefficient; an image decoder 10 configured to restore an orthogonal transform coefficient from the quantization coefficient based on the quantization parameter and generate a pre-filtering image by adding the predicted image to a residual image restored by performing inverse orthogonal transformation on the orthogonal transform coefficient; and a deblocking filter 18 configured to perform a filtering process on the pre-filtering image and control a filtering strength depending on a result of comparison between a luminance signal level of the pre-filtering image and a luminance threshold value.

The invention discloses an operation data compression method. The method comprises the following steps of screening selected operation data meeting a preset condition from target operation data; carrying out data structure modification on the selected operation data through a preset compression algorithm to obtain preprocessed data, wherein one piece of selected operation data corresponds to one piece of preprocessed data, and the preset compression algorithm is obtained by modifying a Snappy algorithm through redundant bit digits, and the redundant bit number is obtained based on the data size value of reference operation data in the target operation data; and compressing the preprocessed data by using the preset compression algorithm to obtain compressed result data. The invention further discloses an operation data compression device, terminal equipment and a computer readable storage medium. By means of the operation data compression method, the compression efficiency of the operation data meeting the preset conditions is improved.

The invention discloses an efficient and energy-saving air compressor which comprises a barrel body. The barrel body is flatly arranged on the ground. A rear wheel rod is welded to the bottom of the barrel body, and the two ends of the rear wheel rod are connected with rear wheels through corresponding bearings. Front wheel rods are vertically welded to the end, far away from the rear wheel rod, of the bottom of the barrel body. The ends, far away from the barrel body, of the front wheel rods are connected with front wheels through corresponding bearings. A motor, a turbine motor and a compressor are sequentially welded to the top of the barrel body. The motor is provided with a spindle, and the spindle is sleeved with a belt pulley through a thread. The turbine motor is provided with a spindle, and the spindle is sleeved with a belt pulley through a thread. The compressor is provided with an air inlet and an air outlet. The belt pulleys are all in concave connection through the corresponding belts. The end, far away from the turbine motor, of an air outlet pipe is connected to the air inlet of the compressor in a sleeved mode. According to the efficient and energy-saving air compressor, the compression efficiency is improved, the service life is prolonged and using risks are reduced.