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Method for coding mixed image

A technology of mixed images and coding methods, which is applied in the field of image processing, can solve the problem that mixed images are not suitable for transformation coding, etc., and achieve the effect of high coding efficiency between frames

Inactive Publication Date: 2011-11-23
BEIJING UNIV OF TECH
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Problems solved by technology

[0014] Since the present invention solves the problem that mixed images are not suitable for transform coding, and since the residual error obtained after inter-frame prediction will be smaller, the efficiency of inter-frame coding for mixed images will be higher

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[0017] This mixed image coding method uses RSQ (Residual scalar quantization) mode for interframe coding of mixed images: according to the principle of the least rate-distortion cost, each TU (Transform unit, transformation unit) adaptive Select DCT (Discrete cosine transform, discrete cosine transform) mode or RSQ mode freely, and use one bit to represent the selection; RSQ mode is to directly quantize the residual obtained after inter-frame prediction, and skip the step of transform coding.

[0018] When transmitting RSQ encoding, scan in row order and assign a context to it.

[0019] Such as figure 2 As shown, the encoding method of this mixed image comprises the following steps:

[0020] (1) For the luminance component in the PU, obtain its prediction block, and then subtract it from the original value to obtain the residual, divide the residual block into different sizes, and obtain TU (Transform Unit, transformation unit);

[0021] (2) quantify the residual in the cur...

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Abstract

The invention discloses a method for coding a mixed image with higher coding efficiency. In the method, a residual scalar quantization (RSQ) mode is used in the interframe coding of a mixed image, according to a principle that rate distortion cost is minimum, each transformation unit (TU) adaptively selects a discrete cosine transform (DCT) mode or the RSQ mode, and a bit is used for expressing the selection; and residual errors obtained after interframe prediction are directly quantized in the RSQ mode, and a step of transforming codes is omitted.

Description

technical field [0001] The invention belongs to the technical field of image processing, and in particular relates to a method for encoding mixed images. Background technique [0002] In existing technologies, coding of mixed images can be roughly classified into the following three categories. [0003] 1. Method based on image coding: [0004] This method still uses the traditional encoding framework to encode the mixed image, but uses different quantization steps for different regions. For blocks containing text and graphics, the reconstruction effect after encoding will be very blurred, so when quantizing these blocks Reduce the quantization step size, allocate more bits to it, and make its reconstruction quality as good as possible. But for a fixed number of bits, if more bits are allocated for text and graphic blocks, then the number of bits allocated for natural image blocks will be correspondingly reduced, so generally speaking, this method still cannot achieve good...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/26H04N7/46H04N7/50H04N19/61
Inventor 丁文鹏朱维佳施云慧尹宝才
Owner BEIJING UNIV OF TECH
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