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Precision self-adapting image area profile coding method

An image area and contour coding technology, applied in the field of image coding, to achieve the effect of accurate position and shape information, and good image coding efficiency

Inactive Publication Date: 2009-10-21
WUHAN UNIV
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Problems solved by technology

When the shape of the region is simple or the quality difference between the region and the background is not high, this kind of image coding algorithm scheme that does not encode the shape information of the region and only encodes the simple shape information of the region is very reasonable; but when the shape of the region is more complicated When , this type of scheme may bring problems such as shape description accuracy, quality control complexity and coding efficiency to varying degrees, so it is necessary to consider the coding algorithm of complex regional shape information

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  • Precision self-adapting image area profile coding method
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  • Precision self-adapting image area profile coding method

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Embodiment Construction

[0014] The accuracy self-adaptation described in the present invention is based on the pixel-based contour coding method. In some applications, the accuracy of the shape of the region does not need to be accurate to the pixel level. Therefore, the present invention considers the pixel block as the shape precision, which can greatly improve the coding efficiency. However, When the pixel block is relatively large, the encoding accuracy of the area outline will be reduced, such as figure 1 As shown, when the precision is 4×4, the shape of the image described by encoding is very accurate, but it requires a lot of codewords and the encoding efficiency is not high. Such as figure 2 As shown, when the accuracy changes from 4×4 to 8×8, some details of the image shape are lost, but the codeword is shortened a lot. Such as image 3 As shown, when the precision changes from 8×8 to 16×16, although the codeword used is very short and the coding efficiency is high, most of the image shap...

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Abstract

This method includes: (1) Divide the image area border (AB) into pixel blocks, (2) determine the start point coordinates of AB, determine block by block the position coordinates of the next pixel block, (3) divide the directions of AB pixel link into directions of up, down, left and right, (4) consider integrally the coding efficiency and practical need to regulate the coding precision of image AB to code the image area outline via the self-adapted iteration combining algorithm. According to practical need, this invention regulates self-adapted the coding precision of image area shape, not only to describe accurately the position / shape info of any image area shape, but also to gain a good image coding efficiency.

Description

technical field [0001] The invention relates to the field of image coding, in particular to an image region contour coding method. Background technique [0002] In the image coding process, the area shape information is used to determine whether the current coefficient belongs to the area, so as to adopt different encoding and decoding strategies in the subsequent encoding. [0003] In actual use, in order to improve the overall coding efficiency, some image coding algorithms do not encode region shape information, such as the maximum displacement method mentioned in JPEG2000; some image coding algorithms only encode simple region shape information, such as the region shape is a regular rectangle when. When the shape of the region is simple or the quality difference between the region and the background is not high, this kind of image coding algorithm scheme that does not encode the shape information of the region and only encodes the simple shape information of the region ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/26H04N1/41G06T9/00
Inventor 胡瑞敏王启军刘琼牟晓弦
Owner WUHAN UNIV
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