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Image processing method of self-adaptive time domain and spatial domain resolution ratio frame

An image processing and resolution technology, applied in image communication, television, electrical components, etc., can solve problems that affect the subjective and objective quality of video images

Inactive Publication Date: 2010-07-14
SHENZHEN TEMOBI SCI &TECH
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide an adaptive time domain and spatial domain resolution framework based on rate-distortion optimization in view of the problem in the prior art that seriously affects the subjective and objective quality of video images due to overcompression. image processing method

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[0056] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0057] figure 1 It shows a flow chart of an image processing method for an adaptive temporal domain and spatial domain resolution framework according to a preferred embodiment of the present invention, and the process is as follows:

[0058] In step S100, the original input video image is received at the encoder side;

[0059] In step S105, the critical code rate condition value is calculated and obtained at the encoder end, the method is as follows:

[0060] Suppose S x，y，k Represents the image at time k, t represents the target code rate, S T x，y，k Represent the resulting image after resampl...

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Abstract

The invention relates to the field of video image processing and provides an image processing method of a self-adaptive time domain and spatial domain resolution ratio frame. The method comprises the following steps: A. an encoder computes and obtains the conditional value of the critical code rate according to the variation of an input video image and a target distribution code rate; B. the encoder compares the conditional value and the threshold value of the critical code rate; if the conditional value of the critical code rate is less than the threshold value, i.e. when the target distribution code rate is less than the critical code rate, the image resolution ratio which is adaptive to the target distribution code rate is obtained through the under-sampling; otherwise, the conventional coding processing is carried out; and C. the encoder recovers and receives the original resolution rate of the image through the upsampling and carries out the conventional coding processing. The method does not cause that the imaged decoded by the encoder produces serious distortion caused by the over-compression or over-quantization of the encoder in the situation of ensuring the low code rate.

Description

technical field [0001] The invention relates to the field of video image processing, and more specifically, relates to an image processing method for adaptive time domain and spatial domain resolution frameworks. Background technique [0002] In the field of narrowband video communication applications, due to the limitation of transmission bandwidth, it is necessary to reduce the encoding rate of video images. Images transmitted at lower encoding rates are likely to be in an over-compressed state, resulting in block effects, quantization Subjective effects such as noise on the video image will produce more obvious damage. In the encoder, the cause of overcompression is mainly caused by overquantization, which is manifested in two situations: (1) The quantization coefficient Qp is too high, which makes the quantization step too large and cannot reflect the details of the video image. As a result, the high-frequency part of the video image is distorted too much, and the detai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/26H04N7/32
CPCH04N19/00781H04N19/00278H04N7/26244H04N19/00921H04N19/0003H04N7/26154H04N7/50H04N7/26159H04N7/26898H04N19/00351H04N19/0043H04N19/0089H04N19/00757H04N7/26377H04N7/26308H04N7/26031H04N19/00266H04N19/00175H04N19/00169H04N7/465H04N7/26271H04N19/107H04N19/146H04N19/147H04N19/172H04N19/176H04N19/19H04N19/31H04N19/59H04N19/61H04N19/80H04N19/87
Inventor 马国强
Owner SHENZHEN TEMOBI SCI &TECH
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