Method and apparatus for encoding, decoding a video signal using additional control of quantizaton error

Abstract

Disclosed herein is a method of encoding a video signal, comprising receiving an original video signal; comparing the original video signal with a previously reconstructed signal; generating a correction signal to minimize a sum of a distortion component and a rate component; and entropy-encoding the correction signal that is transmitted to the decoder for video signal reconstruction, wherein the previously reconstructed signal has been inverse-transformed by additionally using a scaling diagonal matrix.

Description

TECHNICAL FIELD[0001]The present invention relates to a method and apparatus for encoding and decoding a video signal and, more particularly, to a coding technology using an additional control of quantization error.BACKGROUND ART[0002]Compression coding means a set of signal processing technologies for sending digitalized information through a communication line or storing digitalized information in a form suitable for a storage medium. Media, such as videos, images, and voice may be the subject of compression coding. In particular, a technique for performing compression coding on videos is called video compression.[0003]Many media compression technologies are based on two approach methods: predictive coding and transform coding. In particular, a hybrid coding technology includes spatially predicting samples using previously decoded context values and performing transform coding on predicted errors. Such a process is performed on a Gaussian signal so that it has an optimized a Rate ...

AI Technical Summary

Benefits of technology

[0027]The present invention can perform more elaborate and advanced prediction using all the decoded information.

[0028]Furthermore, the present invention can code a signal having an edge and directional structure more efficiently by non-casually predicting a video signal using a transform-coded signal together with a predicted signal.

[0029]Furthermore, the present invention can perform more elaborate and advanced prediction by proposing a non-casual coding technology that may be represented by non-orthogonal transform having a form and parameters.

[0030]Furthermore, the present invention can minimize a quantization error by proposing a quantization algorithm for obtaining an optimized transform coefficient.

[0031]Furthermore, the present invention can perform more advanced coding by proposing a method of deriving an optimized quantization step size.

[0032]Furthermore, the present invention can generate an optimized prediction signal using all the already reconstructed signals and a context signal.

Problems solved by technology

However, common video signals need to be more efficiently coded because they have structures not suitable for Gaussian signals.

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