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Integer transformation method for video coding

An integer transformation and video encoding technology, applied in the field of video encoding, can solve the problems of easy data mismatch, easy drift, and too simple integer transformation model.

Inactive Publication Date: 2011-02-16
深圳市云宙多媒体技术有限公司
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Problems solved by technology

[0012] The purpose of the embodiments of the present invention is to propose an integer transformation method for video coding, which aims to solve the problem that the integer transformation model in the prior art is too simple to effectively concentrate energy to the low-frequency part, and the decoded data is easy to mismatch, easy to problems causing drift

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Embodiment 1

[0056] figure 1 It is a flow chart of an integer transformation method for video coding according to an embodiment of the present invention, and the method includes the following steps:

[0057] Step 1: Set the threshold value θ of error control, and obtain the quantized integer parameter n, so as to perform integer approximation on the transformation parameters of the discrete cosine transform, and obtain the best approximation integer orthogonal transformation matrix.

[0058] Taking the 4x4 discrete cosine transform as an example, the integer approximation method is as follows:

[0059] | a × n - round ( a × n ) | ≤ θ ...

Embodiment 2

[0099] figure 2 It is a structural schematic diagram of an integer transformation device for video coding according to an embodiment of the present invention. The devices include:

[0100] Quantized integer parameter acquisition device, used to set the threshold value of error control, obtain quantized integer parameter, thereby the transformation parameter of discrete cosine transform is carried out integer approximation;

[0101] The best approximation integer orthogonal transformation matrix acquisition device is used to obtain the best approximation integer orthogonal transformation matrix according to the value obtained by the quantization integer parameter acquisition device;

[0102] The time-frequency conversion device is used for performing time-frequency conversion on the video signal by using the integer transformation matrix according to the value obtained by the quantization integer parameter obtaining device and the best approximation integer orthogonal transfo...

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Abstract

The invention discloses an integer transformation method for video coding. The method comprises the following steps of: based on the Discrete Cosine Transform (DCT) of the conventional time-frequency conversion algorithm, setting a threshold value for error control, solving a quantitative integer parameter so as to perform integer approximation on a transformation parameter of the DCT, solving an optimal approximation integer orthogonal transformation matrix, and performing time-frequency conversion on a video signal by using the integer transformation matrix. The integer transformation matrix, which is used for performing the time-frequency conversion on the signal, provided by the embodiment of the invention is simple and convenient to compute, has the energy aggregation close to DCT, and can effectively compress the signal.

Description

technical field [0001] The invention relates to the field of video coding, in particular to an integer transformation method of video coding. Background technique [0002] In video coding, in order to save the bit rate of the image, it is necessary to compress the image signal. The general method is to remove the correlation in the image signal and reduce the dynamic range of image coding, usually using transform coding and quantization technology. Transform coding converts the time-domain signal of the image into a frequency-domain signal. In the frequency domain, most of the energy of the image signal is concentrated in the low-frequency region. Compared with the time-domain signal, the code rate is greatly reduced. H.264 transforms the residual results of motion estimation and intra-frame (Intra) prediction from the time domain to the frequency domain, using an integer transformation similar to 4×4 discrete cosine transform DCT (Discrete Cosine Transform). [0003] The ...

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Application Information

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IPC IPC(8): H04N7/30H04N7/26
CPCH04N19/00781H04N19/61
Inventor 张智雄
Owner 深圳市云宙多媒体技术有限公司
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