92results about How to "High code rate" patented technology

The invention discloses a method for realizing rapid video coding by adopting hierarchical structure anticipation, which relates to the field of video compression coding. The method comprises the following steps of: extracting the brightness information of a current coded macro block from original video data; defining, calculating and comparing time/space correlation characteristics of the current coded macro block, and anticipating whether the macro block may adopt inter-frame prediction or intra-frame prediction; and if the macro block adopts the inter-frame prediction, defining and calculating the flatness characteristic of the macro block, dividing the current coded macro block into one type of a flat macro block, a texture-rich macro block and a characteristic-unremarkable macro block according to the flatness characteristic, anticipating a set of inter-frame prediction mode to be adopted in a targeted way, determining an optimal inter-frame prediction mode in advance to realize rapid inter-frame compression coding. By the method provided by the invention, the inter-frame coding complexity and coding time are greatly reduced on the premise of ensuring lossless video quality, not increasing compression code rate and keeping an output code stream structure, and the high performance of high compression ratio of a conventional standard algorithm is maintained.

Techniques for encoding and decoding data are described. In an aspect, multiple code rates for a forward error correction (FEC) code may be supported, and a suitable code rate may be selected based on packet size. A transmitter may obtain at least one threshold to use for code rate selection, determine a packet size to use for data transmission, and select a code rate from among the multiple code rates based on the packet size and the at least one threshold. In another aspect, multiple FEC codes of different types (e.g., Turbo, LDPC, and convolutional codes) may be supported, and a suitable FEC code may be selected based on packet size. The transmitter may obtain at least one threshold to use for FEC code selection and may select an FEC code from among the multiple FEC codes based on the packet size and the at least one threshold.

Disclosed are a communication method and device on a new carrier type (NCT) carrier. The method comprises: when IMCS corresponding to a scheduled TB is greater than 28, determining corresponding ITBS and a modulation level according to a correspondence among IMCS, the modulation level, and ITBS; searching for a correspondence among ITBS, the size of a PRB, and a TBS according to ITBS and the size of the PRB corresponding to the TB, and determining a TBS, so as to transmit data according to the determined TBS and the modulation level. The TBS in the correspondence is a TBS, among TBSs determined according to the existing protocol, that is not greater than a target TBS determined according to the size of the PRB in the correspondence and a target rate of the NCT carrier corresponding to ITBS, and has the value nearest to that of the target TBS; the target rate is greater than a rate of IMCS when IMCS in a non-NCT carrier is equal to 25. In this way, the resources on the NCT carrier can be fully utilized and the peak rate can be improved.

The invention belongs to the field of video compression encoding and discloses a fast motion estimation video encoding method based on motion vector distribution forecast. The fast motion estimation video encoding method comprises the following steps of: firstly extracting brightness information of a current macroblock from original video data, designing a concise motion estimation search template aiming at integer-pixel motion vector distribution characteristic search, reasonably distributing search points, then forecasting motion vector distribution, and self-adaptively selecting to carry out small-scale search in a corresponding area of the search template according to a forecasting result; and judging whether a motion vector is 0 in the motion estimation search process and taking the motion vector as a criterion of skipping template search. Compared with a motion estimation search algorithm and other improved algorithms adopted in a H.264 video encoding standard, the fast motion estimation video encoding method disclosed by the invention can be used for effectively accelerating the motion estimation search process, shortening the time spent on motion estimation, strictly controlling the increase of code rate, ensuring the better quality of a reconstructed image and achieving the fast motion estimation coding.

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.

The invention discloses a data transmission method and system based on multi-frequency sound wave. The data transmission method comprises the following steps: calculating an error detection code and an error correction code of transmitted data, and adding the error detection code and the error correction code in the transmitted data; converting the transmitted data onto corresponding sound wave frequency to generate continuous audio information and play the continuous audio information, wherein each syllable of the audio information contains one or more frequency signals; when the audio information is received, analyzing the frequency signal from the audio information, and obtaining the transmitted data from the frequency signal. According to the data transmission method based on multi-frequency sound wave disclosed by the invention, the same syllable contains multiple kinds of frequency, so the encodable information of each syllable is increased and the code rate is improved, continuous errors are dispersed in an interlacing manner to improve the error correction ability and the anti-interference ability, two error detection modes and two error correction modes are used in a mixing manner to improve the error correction ability and the anti-interference ability, and synchronous alignment is carried out before decoding to improve the decoding success rate.

The invention discloses a method for hiding H. 264/AVC video data of an encrypted domain. The method comprises the process of encrypting H. 264/AVC videos, the process of hiding the H. 264/AVC video data of the encrypted domain, and the process of extracting hidden data. In the encryption process, code words of an Intra_4*4 prediction mode, code words of an Intra_16*16 prediction mode, code words with the non-zero motion vector difference and code words with a residual coefficient are encrypted. In the process of hiding the video data, a code word mapping method is adopted. The method has the advantages that video encryption and data hiding are conducted directly in an H. 264/AVC code stream domain, the videos do not need to be decoded or partially decoded, and application demands of real-time videos are met. The operation of equal-length code word replacement is conducted in the encryption and data hiding processes, code rate of an H. 264/AVC video stream is not increased, and accordingly the problem of data expansion in the encryption and data hiding processes is solved. Meanwhile, the encrypted video stream with the hidden data is completely compatible with an H. 264/AVC standard and can be decoded by a standard H. 264/AVC video decoder. The data extraction and decoding are conducted in a completely separated mode, and the practicability is higher.

The invention provides a code rate control method of video encoding, electronic equipment and a storage medium. The method comprises the following steps: acquiring currently collected video data, anddetermining the current collection frame rate of the video data; comparing the current collection frame rate with the collection frame rate of the last time slot; and adjusting the code rate for encoding the video data if the current collection frame rate is different from the collection frame rate of the last time slot. By analyzing the change of the current collection frame rate and the collection frame rate of the last time slot, the code rate is adjusted according to the change situation of the current collection frame rate so as to adjust the data size transmitted in the unit time, the packet loss rate of the video data can be adjusted, and the video effect lagging phenomenon is avoided.

The invention provides a communication method based on a low-orbit mobile communication satellite. A security positioning and timing (SPT) low-orbit mobile communication satellite signal is generated,and communication is conducted. The signal is characterized in that as for a time domain structure, the communication satellite signal adopts a time division multiplexing system in a time domain; asfor a frequency domain structure, the communication satellite signal adopts a frequency division multiplexing system in a frequency domain; the communication satellite signal adopts a multi-beam and multicolor multiplexing system, each beam uses one or more sub-bands as needed, and meanwhile multicolor multiplexing of the adjacent beams is met so as to lower interference between the beams; at least one of the sub-bands in the communication satellite signal is used for broadcasting a paging channel (PCH) signal; and the sub-bands, except the sub-bands for broadcasting the PCH signal, of the communication satellite signal can be used for a broadband spread spectrum SPT signal, and the SPT signal is broadcasted in N(PCH) time slots of PCH signal broadcasting. A communication navigation fusionSPT signal system is designed, and thus the positioning timing and anti-interference capacity are improved.

The present invention relates to coding method and coding device that allow Rate-Compatible LDPC (low-density parity-check) codes to have favorable BER performance both with a low code rate and with a high code rate. In coding of LDPC codes that have plural code rates and whose all parity check matrices are composed of plural cyclic matrices, a coder 121 performs the coding in such a way that 1<w₀ and w₁<w₀ are satisfied when the maximum column weight of the cyclic matrices in the check matrix of a certain code whose code rate is not the minimum value among the LDPC codes is defined as w₀ and the maximum column weight of the cyclic matrices in the check matrix of a code having a code rate lower than that of the certain code is defined as w₁.

The invention discloses a rapid intra-frame mode decision method specific to a high efficiency video coding standard. The method comprises the following steps: (1) selecting a prediction unit (PU) being N*N in size; (2) calculating an average gradient value of pixel points in the PU with a Sobel operator; (3) determining a threshold value for judging an intra-frame prediction mode; (4) initially judging the intra-frame prediction mode according to the average gradient value of the pixel points in the PU and the threshold value for judging the intra-frame prediction mode; (5) calculating gradient directions of the pixel points in the PU according to a gradient value of each pixel point in the PU calculated by the Sobel operator; and (6) performing table lookup according to the gradient directions of the pixel points of the PU in order to determine the intra-frame prediction mode. In the rapid intra-frame mode decision method, a Sobel edge detection operator is adopted, so that the intra-frame decision speed is increased under the situation that the decision accuracy of a direction mode is kept constant; the complexity is low; the calculation amount is small; only a small amount of code rate is increased; and a large amount of coding time is saved.

The embodiment of the invention discloses a video compression processing method and device, an electronic device and a storage medium. The video compression processing method comprises the steps of using an end-to-end model obtained by training through a single loss function to perform video compression and obtaining video compression information.

The invention provides an H matrix construction method of an RS-LDPC two-dimensional product code and a slide truncation decoding method thereof in a communication system channel and in a decoding technology field. In two-dimensional product coding, firstly, RS code coding is used in a horizontal direction and then rate compatible LDPC code coding is performed in a vertical direction. An RS code of the horizontal direction eliminates an error flat layer problem existing in the LDPC coding. The LDPC code of the vertical direction constructs a check matrix and can uses a slide truncation decoding mode to reduce participated decoding code words in a high signal to noise ratio area so that time delay is reduced.

The invention relates to the technical field of videos and provides a scalable video code rate controlling method and device combined with visual perception. The method comprises the steps of receiving an input video file, conducting scalable coding on the video file to obtain the coding rate of each micro block on one hand, and conducting saliency map calculation on video frames of the video file to obtain a visual saliency map of each video frame on the other hand; constructing a watch transfer matrix, and calculating a time-space saliency map of the obtained visual saliency map according to the watch transfer matrix and with combination of lens display duration and human eye visual characteristics; sequencing the importance of the code rates of the micro blocks according to saliency information of the micro blocks in the time-space saliency map; controlling the code rates of the micro blocks according to a sequencing result. According to the scalable video code rate controlling method and device combined with visual perception, the code rate of an area with a low watch possibility is preferably decreased, and the code rate of an area with high saliency is increased, so that the perception quality of the area with the high saliency is obviously improved.

A block down sampling within the AVS-M Video Coding Fast Motion estimation methods, involving video compression technology, use of the invention in a block-matching criteria SAD video compression algorithm, on the block 16 X 16, 16 X 8 block, block 8 X 16 X 8 block 8 four blocks of a pattern of arbitrary block by block pixel sampling points within the interval sampling of pixels calculated manner, that is, within the pixel block with points in the matrix, by the way interval of each and every trip out of pixels in the sampling points. SAD relative to the whole sampling method, the invention will be sampling of the search algorithm greatly reduce computational complexity, lower rate could reach 50%; PSNR slightly decreased, but its visual quality almost no change; Bit rate slightly increased. Overall, the coding efficiency is greatly improved.

The application, which relates to the image processing field, discloses a method for establishing a virtual reference frame and equipment. With the method and equipment, problems of high complexity of the decoder, high power consumption or needing of extra code rate for transmission during virtual reference frame establishment in the prior art can be solved. The method comprises: at least one image frame transmitted by a coder is received; and a virtual reference frame is established by using a block with a virtual reference frame identifier in the at least one image frame. Because the virtual reference frame identifier is added to the block for establishing the virtual reference frame, virtual reference frame transmission is not needed during the transmission process, so that code rate rising can be avoided. Moreover, the decoder only needs to extract the block with the virtual reference frame identifier to form the virtual reference frame and image-frame-based virtual reference frame establishment using an algorithm identical with the coder is not required, so that the complexity and power consumption of the decoder can be reduced. The method and equipment can be used for establishing a virtual reference frame.

The invention discloses a novel data coordination method for continuous variable quantum key distribution. Amplitude classifiers at a sending end and a receiving end classify screening data; a data discrete processing unit at the receiving end performs discretization processing on the classified data and then transmits the data to the sending end; the data discrete processing unit at the sending unit performs discretization processing on the classified data according to the discrete data sent by the receiving end and then transmits the data to a discrete data storage unit; a syndrome computation unit at the receiving end computes to obtain the syndrome data, and sends the same to the sending end; a decoding computation unit at the sending end performs decoding computation to obtain a decoding result to transmit to the receiving end; key reconfiguration units at the sending end and the receiving end performs key reconfiguration and integration on the decoding result data, and then the reconfigured and integrated data is transmitted to a private key amplification unit to obtain the final key data. By adopting a segmented error correction method disclosed by the invention, the code rate for error correction is improved, and the entire safety code rate and the decoding efficiency of a CV-QKD system are improved.

A method is provided for encoding the modulation code of high-density optical disk. The character is as follow. The run length is 1 to 10 and the code rate is 4/6. Add DC control bit in the source data to increase the capacity of controlling direct current component. There are 21 meeting the d-k demand in the 6-figure code letter. 16 code letters are choosed as basic code letters to compose the basic code table, and in 5 code letters left the one whose head and end are both 0 is used as connector. Alternative table is made up of basic code letters and connectors, the length of which is 56. The cascade collision problem of code letters is settled by forward looking encoding. If there is cascade collision between code letters through current and forward looking data modulation, the 2 groups of code letters are replaced by the ones in the alternative table; otherwise, modulate the current data. It has higher capacity and encoding efficiency than DVD. The capacity of single side and double layer is up to 13G. It can meet the demand of high definition video programmes. Furthermore, its direct current component is acceptable; the biggest DSV is 2 times of DVD; the code rate is 33.3% higher than DVD; encoding efficiency is one percentage point higher than DVD.

The invention discloses a video encoding method and device. The method comprises the steps of: aiming at a current frame to be encoded, if the current frame is a virtual I frame, calculating a difference value of motion vectors of the virtual I frame and a reference I frame thereof; judging whether the difference value is greater than a preset difference value threshold; and if yes, encoding the current frame as an I frame. According to the video encoding method and device disclosed by the invention, when the current frame is the virtual I frame and the calculated difference value of the motion vectors of the virtual I frame and the reference I frame thereof is greater than the preset difference value threshold, a scene can be considered to be changed and the current frame is encoded as one I frame so as to ensure that when the scene is changed, image quality is high and a code rate cannot be obviously increased.

The invention discloses a video frame transmission method, a video frame transmission system and a server, and the method comprises the steps: enabling a sending end to obtain original video data andreference network information fed back by a receiving end; determining a first code rate and a second code rate according to the reference network information; encoding a to-be-transmitted video framein the original video data according to the first code rate and the second code rate respectively to obtain a first video frame corresponding to the first code rate and a second video frame corresponding to the second code rate; obtaining current network information, and matching the first video frame, the second video frame and the current network information to obtain a matching result; and sending the first video frame or sending the second video frame or not sending the video frame to a receiving end according to the matching result. According to the technical scheme provided by the invention, the video fluency and stability are improved.

The invention discloses an encryption domain H.264/AVC video data hiding method based on MVD (Motion Vector Difference) codon mapping. In an H.264/AVC video encryption process, codons of prediction modes of 4*4 sub-blocks of which mode flag bits are 0 in macro blocks of an Intra_4*4 prediction mode, the codons of an Intra_16*16 prediction mode, exponent Columbus codons of motion vector differenceswhich are not 0, and Level codons of residual error coefficients of which suffix lengths are not 0 are encrypted; in a process of embedding secret information into an encryption domain H.264/AVC video, all MVD codons of which absolute values are 2 and 15 are divided into six codon spaces, and if the MVD codons identified from encryption domain H.264/AVC video streams belong to any codon space, information bits are embedded into codons through adoption of a codon mapping method; and secret information extraction can be finished both in an encryption domain and a decryption domain. The method has the advantages that the secret information is embedded into the encryption domain H.264/AVC video, and the secret information can be effectively extracted in the encryption domain H.264/AVC video and the decryption domain H.264/AVC video.