79 results about "Residual coding" patented technology

An apparatus and method for processing video data are provided. The method includes determining a primary transform CN for application to residual data at an encoder, determining a secondary transform TrK for application to the residual data, applying the primary transform CN to the residual data, and selectively applying the secondary transform TrK to the residual data, wherein N denotes the length size of the input vector on which the primary transform CN is applied, and K denotes the length of the first few coefficients of the primary transform output on which the secondary transform TrK is applied. Similar inverse operations are performed at the decoder, viz., selectively applying an inverse secondary transform inv(TrK) at the decoder for the input residual data, followed by application of the inverse primary transform inv(CN).

The invention relates to a method for optimizing residual coding by using residual coefficient distribution features and bayes theorem. The method comprises the following steps of (1) reading each frame of images in a video sequence according to a sequence set in a control file; (2) performing intra-frame prediction and inter-frame prediction on the brightness and the chromatic value of each frame of images so as to obtain a residual coefficient; (3) performing texture judgment or bayes model judgment on a residual block TU (the maximum is 32*32) according to the residual coefficient so as to judge whether block encoding is required to be stopped ahead of time or not; (4) performing DCT (discrete cosine transform) and quantification on the whole residual block TU so as to obtain a quantification parameter; and (5) performing entropy encoding on the quantification coefficient, and finally outputting the quantification coefficient in a bit stream mode. By the method, the video encoding speed is increased under the condition that the loss on the encoding quality can be ignored, and videos can be conveniently acquired in real time.

A method for encoding a first set of pixels in a first image in a sequence of images is described. From a set of encoding modes, the method selects a first mode for encoding the first set of pixels. The method then determines whether encoding the first set of pixels in the first mode satisfies a set of quality criteria. The method foregoes encoding the first set of pixels in a second mode from the set of encoding modes, when the first mode encoding satisfies the set of quality criteria. The method also provides a video encoding method that examines several different methods for encoding a set of pixels in a first image. From a list of possible encoding modes, the method eliminates a set of encoding modes that are not likely to provide a suitable encoding solution. The method then examines different encoding solutions based on the remaining encoding modes in the list.

The invention relates to a picture coding device, a picture coding method and image repeater facility used for recoding digit compressed picture signals to obtain digit picture signals with the compressed format which is the same to or different from the compressed format of the digit compressed picture signals to be recoded. A picture coding apparatus contains a rate control unit, an image buffer, an orthogonal transformation unit, a quantizing unit, a variable length coding unit, a motion predicting unit, a coding unit, and an output buffer. The rate control unit allocates a target code amount to each of pictures, and transfers a quantizing value which is determined by a code amount to the quantizing unit. This target code amount is calculated by adding a reference target code amount to a correction value. The correction value is calculated based on a difference between a predetermined target value and an actual value of a remaining coding picture amount of the output buffer.

The present invention provides a method for adaptively controlling the number of BINs in an arithmetic coding context coding mode, a decoding method corresponding to the number of BINs in an adaptively controlling arithmetic coding context coding mode, an encoder and a decoder, wherein the adaptive control arithmetic coding context coding mode The method for the number of BINs includes: knowing the upper limit of the number of BINs generated by the encoder in unit time or per frame; obtaining the value of the control flag and control parameter of each slice according to the upper limit; according to the control flag and control parameter of the current slice The value of controls each syntax element representing residual coding in the current slice to be coded in the context coding mode or the bypass combination coding mode. By improving the layered control mechanism, the present invention overcomes the defect of large control granularity of the layered control mechanism, so that the number of BINs does not exceed but is as close as possible to the upper limit.

A transform method, according to the present invention, comprises the steps: obtaining transform coefficients for a target block; determining a non-separable secondary transform (NSST) set for the target block; selecting one of a plurality of NSST kernels included in the NSST set on the basis of an NSST index; and generating modified transform coefficients by non-separable secondary-transform of the transform coefficients on the basis of the NSST kernel that has been selected, wherein the NSST set for the target block is determined on the basis of an intra-prediction mode and / or the size of the target block. According to the present invention, the amount of data transmitted, which is required for residual processing, can be reduced and residual coding efficiency can be increased.