465results about How to "Improve coding efficiency" patented technology

A method and system for image coding, wherein an image is divided into a plurality of blocks for scanning. The pixels values in the scanned block are represented by a plurality of level-run value pairs, wherein the level value is indicative of a non-zero pixel value and the run value is indicative of the number of consecutive zero pixel values preceding the non-zero pixel value. A plurality of contexts indicative of the level-run value pairs are conveyed to a decoder for allowing the decoder to reconstruct the image based on the contexts. The assignment of the contexts is also based on the level value of a preceding level-run pair. Additionally, instead of an end-of-block symbol, the number of non-zero coefficients is provided to the decoder prior to conveying the contexts thereto.

The present invention provides a new method and an apparatus for spectral envelope encoding. The invention teaches how to perform and signal compactly a time/frequency mapping of the envelope representation, and further, encode the spectral envelope data efficiently using adaptive time/frequency directional coding. The method is applicable to both natural audio coding and speech coding systems and is especially suited for coders using SBR [WO 98/57436] or other high frequency reconstruction methods.

Video encoding and decoding methods and systems for video streaming are provided. The video encoding method includes encoding first resolution frames using scalable video coding, upsampling the first resolution frames to a second resolution, and encoding second resolution frames using scalable video coding with reference to upsampled versions of the first resolution frames.

A method and apparatus for reducing block artifacts during a residual prediction in a multilayer-based video coding are disclosed. The multilayer-based video encoding method includes obtaining a difference between a predicted block for a second block of a lower layer, which corresponds to a first block included in a current layer, and the second block; adding the obtained difference to a predicted block for the first block; smoothing a third block generated as a result of the addition using a smoothing function; and encoding a difference between the first block and the smoothed third block.

Disclosed is a method for scalably encoding and decoding a video signal. The video signal is encoded through an inter-layer prediction scheme based on a data stream of a base layer encoded with ×¼ resolution. The inter-layer prediction scheme applied between the enhanced layer and the base layer representing ×4 resolution difference includes a motion prediction scheme for predicting motion and dividing a macro block of the enhanced layer based on division information, mode information, and/or mode information of a block of the base layer. Thus, the inter-layer prediction scheme is applied between layers representing ×4 resolution difference, thereby improving a coding efficiency.

Scalable video coding is rendered more efficient by deriving/selecting a subblock subdivision to be used for enhancement layer prediction, among a set of possible subblock subdivisions of an enhancement layer block by evaluating the spatial variation of the base layer coding parameters over the base layer signal. By this measure, less of the signalization overhead has to be spent on signaling this subblock subdivision within the enhancement layer data stream, if any. The subblock subdivision thus selected may be used in predictively coding/decoding the enhancement layer signal.

Different algorithms are used in H.264/AVC intra coding to form three coding levels. Algorithms used in two of the three coding levels reduce calculation complexities and power consumptions. The basic level is an exception, which fully keeps an original picture quality. Thus, various needs can be met by coding in the various levels with the various algorithms.

The embodiment of the invention discloses a self-adaptable prediction method, comprising the steps as follows: block division is carried out on micro-blocks required to be predicted in frame by a plurality of block division methods; a plurality of prediction modes are used to predict each sub-block in each block division result, thus gaining the sub-block residue of the current sub-block; according to the type of the sub-block, a plurality of conversion types are selected to convert the residues of each sub-block, thus gaining the ratio of bit rate and distortion of the current sub-block; the micro-block is predicted according to the minimum ratio of the bit and the distortion out of all bit rate/distortion ratios, the prediction mode and the conversion method. The embodiment of the invention discloses a self-adaptable prediction device which comprises a block division module, a prediction module, a conversion module, a selection module and a frame prediction module; the method and the device can smartly carry out the coding in frames or between frames of the micro-blocks, adapt for the local vein statistical characteristics of the micro-block better and improve the coding efficiency.

A method and apparatus for video intraprediction encoding and decoding are provided. The encoding method includes dividing an input block into at least first and second areas; performing intraprediction-encoding on pixels of the first area; reconstructing the intraprediction-encoded pixels; and predicting pixels of the second area using the intraprediction-encoded pixels of the first area according to a prediction mode of a plurality of prediction modes. The decoding method includes receiving a bitstream comprising data for pixels of a first area and direction information; determining an intraprediction mode for a current block; performing intraprediction-decoding on pixels of the first area; and predicting the pixels of a second area using the received direction information and the intraprediction-decoded pixels for the first area.

A method for fast macroblock mode decision is disclosed. The method includes: (A) determining if a motion cost at the origin (0, 0) or a prediction motion vector (PMV) for a 4n*4n macroblock is smaller than a first threshold; (B) if the motion cost is smaller than the first threshold, determining a macroblock mode as 4n*4n and ending the method; (C) if the motion cost is not smaller than the first threshold, using an adaptive diversity search strategy to perform motion estimation on four 2n*2n blocks associated with the 4n*4n macroblock; (D) determining if all motion costs of the four 2n*2n blocks in step (C) are smaller than a second threshold; and (E) if step (D) determines that the motion costs of the four 2n*2n blocks are smaller than the second threshold, determining the macroblock mode as 2n*2n and ending the method.

The present invention relates to the encoding and decoding of image information. According to the present invention, the decoding method comprises the steps of: entropy-decoding received information; performing inter prediction on a current block based on the entropy-decoded information; and restoring images by using the prediction results, wherein, in the inter prediction step, a skip mode or merge mode is applied to the current block and movement information of the current block may be determined based on the movement information of a neighboring block of the current block.

A first-viewpoint picture is encoded. A first decoded picture is generated in the encoding of the first-viewpoint picture. A second-viewpoint picture is encoded. A second decoded picture is generated in the encoding of the second-viewpoint picture. View interpolation responsive to the first decoded picture and the second decoded picture is performed to generate a view-interpolated signal for every multi-pixel block. One is decided from different coding modes including coding modes relating to the view interpolation for every multi-pixel block. A prediction signal is generated in accordance with the decided coding mode. The prediction signal is subtracted from a third-viewpoint picture to generate a residual signal for every multi-pixel block. A signal representative of the decided coding mode and the residual signal are encoded to generate encoded data representing the third-viewpoint picture and containing the signal representative of the decided coding mode.

A highly accurate reproduction of visual intensity and contrast rather than the conventional 8-bit color depth is more and more used, motivating the development of an enhanced dynamic range called high bit-depth. A method for encoding a first, low bit-depth image of M bit RGB pixels and a second, high bit-depth video image of N bit RGB pixels, M<N, both having same spatial resolution, comprises generating a first transfer function based on color histograms of the first and the second video image, generating a second transfer function based on the first transfer function, applying the second transfer function to the first video image, wherein a transformed first video image is generated, calculating and encoding the residual, encoding the first video image and transmitting the encoded first video image, the second transfer function and the encoded difference.

A transform coder adaptively configures window sizes for transform coding in a two-pass process to maximize coding efficiency, while achieving necessary time resolution to avoid pre-echo. In a first pass, the coder places small size windows over detected transient regions of an input signal in an open-loop window configuration process. In a second pass, the coder adjusts the window size configuration according to measurements of the achieved quality in a closed-loop window configuration process. Where quality measurement shows unacceptable quantization noise, the coder increases window size. Where pre-echo is detected, the coder reduces window size within coding bit rate constraints.

A motion vector predictor candidate generation unit derives a plurality of motion vector predictor candidates by prediction from first coded prediction blocks neighboring a prediction block subject to coding within the same picture as the prediction block subject to coding, or from a second coded prediction block located at the same position as or in the neighborhood of the prediction block subject to coding in a picture different from that of the prediction block subject to coding, and adds the derived motion vector predictor candidates in a motion vector predictor candidate. The motion vector predictor candidate generation unit determines, for the purpose of obtaining a predetermined number of motion vector predictor candidates, which of first coded prediction blocks provides the motion vector from which to derive the motion vector predictor candidate, organizing the blocks in the order of priority.

An image decoding method performed by a decoding device according to the present invention comprises the steps of: acquiring information on inter prediction of a target block through a bit stream; deriving motion information of the target block on the basis of the information on inter prediction; deriving a prediction sample by performing inter prediction for the target block on the basis of the motion information; generating a reconstruction block on the basis of the prediction sample; deriving modified motion information of the target block on the basis of the reconstruction block; and updating the motion information of the target block on the basis of the modified motion information. According to the present invention, modified motion information of the target block can be calculated, and the motion information of the target block can be updated on the basis of the modified motion information, so that the overall coding efficiency can be improved.

Initial value is selected when motion estimation is performed using predicted motion vector in video codec in which multiple references are allowed, and coding amount of motion vectors is reduced using predicted motion vector. Motion vector encoding apparatus includes predicted motion vector generator that generates adjacent motion vectors of current block with respect to each of reference pictures and generates each predicted motion vector of the current block from the generated adjacent motion vectors, motion estimator that determines final motion vector of the current block and final reference picture corresponding to the final motion vector with regard to search regions of the reference pictures, differential unit that obtains difference between the final motion vector of the current block and final predicted motion vector corresponding to the determined final reference picture among the predicted motion vectors, and unit for encoding information about the final reference picture and the difference.

The embodiment of the invention claims a processing method for transforming data, comprising: estimating and analyzing the numerical value range of the image data after two transformations based on pre-setting two needed transforming matrixes needed by two transformations; estimating the characteristic different value of numerical value of two transformations based on two transformed numerical value; applying the first transformation of two transformations to the data to be transformed, and compensating the data after the first transformation based on the different value of estimated numerical value. The embodiment of this invention further discloses a processing device for transforming data, method and device of coding and decoding. Appling the embodiment of this invention, which can adjust the numerical value of the transformed data so as to enable the numerical values of the image data to be the same after different transformation and really reflect the influence of the transformation to the data when applying the self-adoptive block transformation technique, and to select the transformation with better effect and improve the coding efficiency.

A GUI operation screen emulation device generates screen data for displaying a screen based on operation information given from thin client terminal. An H.264 coding software/device, whenever receiving each frame of the screen data, stores the frame in a short-term reference frame field of a DPB, and, when the activation event is registered in a message queue, copies the frame registered latest at that point of time to a long-term reference frame field. Further, the H.264 coding software/device codes the received frame by referring to the respective frames registered in the DPB.

The present invention relates to a selecting method for the optimal mode of the intra prediction coding used for video frequency coding, which belongs to the video frequency coding and decoding field. The steps of the method are that a rate-distortion cost function is constructed on the basis of a prediction code rate; the rate-distortion cost of each prediction mode is calculated by the structured function, and the prediction mode with minimum rate-distortion cost is selected as the optimal mode of the intra prediction coding according to the calculating result. Proportionally, the present invention also provides a device for the selecting of intra prediction coding optimal mode of the video frequency coding. The present invention effectively avoids actually coding every blocks during the rate-distortion optimizing process on the basis that the selected mode is closer to the optimal mode of the original rate-distortion optimization model selecting, and greatly improves the coding efficiency on the precondition of ensuring little change on the code rate and the PSNR of the coding and the full searching method.

A method of encoding a mode value representing a prediction mode comprises selecting from among at least first and second encoding processes an encoding process to apply to the mode value to be encoded. The first encoding process comprises encoding first information indicating a predetermined relationship between the mode value to be encoded and at least one predetermined value. The second encoding process comprises encoding second information representing the mode value to be encoded. The encoding by the second encoding process takes account of the outcome of at least one prior first encoding process. This can be achieved by updating mode probabilities based on the outcome of the first, as well as the second, encoding process. Such a method creates a link between the first and second encoding processes and can improve coding efficiency.

A method of encoding scalable video data having multiple layers where each layer in the multiple layers is associated with at least one other layer includes identifying one or more layers using a first identifier where the first identifier indicates decoding dependency, and identifying reference pictures within the identified one or more layers using a second identifier. The coding of the second identifier for pictures in a first layer is independent of pictures in a second enhancement layer. As such, for all pictures with a certain value of DependencyID, the syntax element frame_num is coded independently of other pictures with different values of DependencyID. Within all pictures with a pre-determined value of DependencyID, a default frame_num coding method is used.

The present disclosure relates to an intra prediction method and apparatus and an image encoding/decoding method and apparatus using the same. The disclosure provides the intra prediction apparatus that predicts the pixel values of respective pixels in a current block by weight-averaging the pixel values of one or more adjacent pixels in neighboring blocks to the current block according to the distances between each pixel in the current block and the adjacent pixel(s). According to the disclosure, the current block to be encoded can be predicted more accurately so that the encoding efficiency is improved by reducing the difference between the original block and the predicted block, and thereby video compression efficiency can be improved.

A method for improving the performance of the BLSkip mode in SVC includes the steps of upsampling the motion field of the base layer, interpolating the motion vectors for the intra MBs, interpolating the 8×8 block motion field to a 4×4 block motion field, and generating a MV predictor for a 4×4 block in BLSkip mode using neighbor candidates.

A method for decoding a scalable bitstream comprising a base layer and at least one enhancement layer, the method comprising obtaining information regarding a set of tiles in an enhancement layer picture; obtaining information regarding a set of tiles in a base layer picture; obtaining coding constraints for said set of tiles in the enhancement layer picture, the coding constraints comprising at least inter-layer prediction constraints in with respect to the base layer picture; and decoding said set of tiles in the enhancement layer picture according to the coding constraints as an independently decodable region.

The related motion estimation coding method based on background in digital video code compression technology comprises: initiating the background frame, reading in a frame image to decide its code type, completing coding to current frame by traditional frame inner coding method if the image is I frame; or reading in a macro block if the image id P frame, then coding the block with traditional frame inner coding method if the block is I type, or coding as both traditional reference frame motion estimation and background frame reference motion estimation if the block is P type, and updating current background frame during coding to generate current background frame. This invention improves coding efficiency, special useful to video monitor and conference.

The invention discloses an image shade prediction method based on infraframe encoding, which is used in the image shade prediction processing in infraframe encoding prediction processing course and includes the following steps: divide each shade block into a plurality of 2<N>is multiplied by 2<N> pixel blocks in macroblock, wherein, n=0, 1 or 2; perform image shade infraframe encoding prediction processing with each 2<N>is multiplied by 2<N> pixel block as a prediction unit. The invention also can effectively improve the encoding efficiency of image shade in video image encoding technique.

The coding efficiency and the amount of processing can be further improved in methods that use the correlation between spatial and temporal directions to estimate parameters that are required for predictions. In LM prediction that predicts pixel values of chrominance, based on pixel values of luminance, an index for a filter that downsamples a luminance image is adaptively signalled.

The invention relates to the communication field, and discloses a method for receiving and sending the voice coding and decoding and a device thereof, so as to allow the code efficiency of voice signals to be enhanced and the voice quality to be enhanced. The time-frequency conversion is performed to voice signals to obtain X frequency domain conversion coefficients, the X frequency domain conversion coefficients are quantified to obtain the broad-band coded signals, wherein, Y frequency domain conversion coefficients which are relatively important are quantified with a first codebook, the other X-Y frequency domain conversion coefficients are quantified with a second codebook, the code word quantity of the first codebook is higher than the code word quantity of the second codebook, Y is smaller than or equal to X and larger than or equal to 1, and the acquired broad-band coded signals are sent. According to the ratio of the average spectrum amplitude and the maximum spectrum amplitude of each quantified block, fine spectrum structures of the frequency domain quantified signals in the quantified block are reduced, wherein, the smaller the ratio is , the larger the reducing extent of the fine spectrum structures are.

A video coding method according to the present invention is for coding a signal to be coded which represents a video, and includes: generating a prediction signal predictive of the signal to be coded, based on a coded signal coded prior to the coding of the signal to be coded (S16); quantizing a prediction error obtained by subtracting the prediction signal from the signal to be coded to generate quantized coefficients (S12); inversely quantizing the quantized coefficients to generate a quantized prediction error signal (S13); generating first filter information, based on statistical properties of only the prediction signal among the prediction signal and the quantized prediction error signal, and generating second filter information, based on statistical properties of only the quantized prediction error signal among the prediction signal and the quantized prediction error signal (S14); and performing entropy coding on the quantized coefficients generated in the quantizing and the first and second filter information generated in the generating of filter information so as to generate a coded signal (S15).