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KLT matrix training method for video interframe coding

A training method and internal coding technology, applied in the field of KLT matrix, can solve the problems of high computational complexity and difficult to fit, and achieve the effects of improving the peak signal-to-noise ratio, stabilizing the transformation performance, and reducing the training complexity.

Inactive Publication Date: 2009-07-22
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

However, the computational complexity of the training process of the KLT matrix is ​​very high, and additional information is required to represent the trained KLT matrix. Therefore, the method of real-time training of the KLT matrix is ​​difficult to be suitable for applications such as video coding.

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  • KLT matrix training method for video interframe coding
  • KLT matrix training method for video interframe coding
  • KLT matrix training method for video interframe coding

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Embodiment Construction

[0027] The present invention trains a KLT matrix with stable transformation performance and better than DCT for the intra-frame prediction residual signal of H.264 / AVC, so as to avoid huge calculation amount of real-time training and extra bit overhead for representing the KLT matrix.

[0028] The process flow of the KLT matrix training method of the intra-frame prediction residual signal based on optimal spectrum matching proposed by the present invention is shown in the attached image 3 Shown, in conjunction with accompanying drawing and embodiment describe in detail as follows:

[0029] 1. Frequency Spectrum Extraction

[0030] Residual signals of different prediction modes have different energy distribution characteristics, while the energy distribution of residual coefficients in the same intra prediction mode is relatively consistent. Therefore, the residual signals of each prediction mode must be trained separately.

[0031] During the training process, the energy dis...

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Abstract

The invention provides a Karhunen-Loeve Transform (KLT) matrix training method for a video intra-frame coding belonging to the video coding field in a signal treatment. The invention firstly picks-up a residual signal frequency spectrum under each intra-frame prediction model, then groups a residual sample and gets a candidate KLT matrix by using a conventional method, optimizes each candidate KLT matrix by using a low frequency subband preferential replacement policy and calculates the optimized transformation performance, and selects an optimization KLT matrix with best transformation performance as a transformation matrix of the residual signal under the prediction model. The invention avoids great calculation amount for real-timely training the KLT matrix during the coding, reduces an additional bit overhead for showing the training matrix, and the trained matrix has very good transformation performance.

Description

technical field [0001] The invention relates to the technical field of video coding in signal processing, in particular to training a KLT matrix with good transformation performance for the residual signal of intra-frame prediction. Background technique [0002] H.264 / AVC is the latest video coding standard jointly proposed by ITU-T video coding experts and ISO / IEC motion picture expert group. Like previous coding standards (such as H.261, H.263, MPEG-1, MPEG-2, MPEG-4, etc.), H.264 / AVC also adopts a hybrid coding framework. When coding, the video image is first divided into into multiple macroblocks, and then perform prediction, transformation and entropy coding in units of macroblocks. [0003] Prediction includes intra prediction and inter prediction. Intra-frame prediction can eliminate the spatial correlation of video sequences, while inter-frame prediction can eliminate the temporal correlation of video sequences. After the prediction, the residual data still has sp...

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Application Information

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IPC IPC(8): H04N7/26H04N7/32H04N19/61
Inventor 余胜生高毅陈加忠郭红星孙伟平陈小平黎单
Owner HUAZHONG UNIV OF SCI & TECH
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