38results 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 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.

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 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 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 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.

The invention discloses a data compression method and system based on an LZSS algorithm and a Sunday algorithm, belongs to the technical field of data compression, and aims to solve the technical problem of how to avoid reduction of a data volume compression rate caused by too small matching length during matching. According to the technical scheme, entropy coding is used for preprocessing to-be-compressed data, a compression standard is selected, meanwhile, a window is changed into a dynamically set size, a minimum matching length is set, a matched maximum character string is found, the compression efficiency is improved, and then the time consumption during character string matching is reduced through a Sunday character string matching algorithm. The system comprises a preprocessing module, a selection module, a first setting module, a second setting module, a compression module and a matching module.

The invention relates to the technical field of garbage compression equipment manufacturing, in particular to a front-in and front-out rotating box type horizontal split type garbage compression station. The garbage compression station comprises garbage containers, a garbage compression device and a feeding mechanism, and further comprises a rotating box platform, wherein the rotating box platformcomprises a fixed base, a rotating platform, a rotating device and a connecting plate; the fixed base is fixed to the ground through an embedded part, the rotating device is arranged on the fixed base, and the rotating platform is connected with the rotating device through a connecting plate; and two placing platforms used for placing the garbage containers are arranged on the rotating platform,and the two placing platforms move along with movement of the rotating device, so that the garbage containers rotate by 180 degrees. The garbage compression station is novel in structure, reasonable in design and small in occupied use area, the operation of unloading an empty garbage container and then placing the empty garbage container on the placing platform is not needed, the time for replacing the garbage container is shortened, and therefore the garbage compression efficiency is greatly improved.