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Semi-pixel element image interpolation method

An interpolation method and half-pixel technology, applied in image communication, television, electrical components, etc., can solve the problems of image quality degradation, encoder efficiency degradation, and unsupported rounding control values, etc., to reduce the number of memory accesses and operations Quantify and simplify the effect of edge expansion method

Inactive Publication Date: 2007-07-18
YULONG COMPUTER TELECOMM SCI (SHENZHEN) CO LTD
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Problems solved by technology

[0010] In the half-pixel image interpolation method of the prior art, simply using the formulas (1), (2), and (3) to generate a half-pixel image requires three traversals to access the image memory, and the memory access is huge, causing the efficiency of the encoder to decrease
[0011] In addition, the latter two methods do not support the rounding control value (rounding-control), and due to the shift operation when calculating the horizontal and vertical half-pixels, it will cause the error of the rounding-control of the diagonal half-pixel, which will cause motion Errors occur during compensation, resulting in a decrease in image quality

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Embodiment Construction

[0030] The present invention will be described in detail below in conjunction with the drawings and embodiments.

[0031] As shown in Figure 1, the above formulas 1, 2 and 3 are modified, and the half-pixel level b corresponding to the whole pixel A can be expressed as:

[0032] b=(m+1-rounding_control) / 2 (4);

[0033] The horizontal half-pixel corresponding to the whole pixel C is e and can be expressed as:

[0034] e=(n+1-rounding_control) / 2 (5);

[0035] The diagonal half-pixel d corresponding to the whole pixel A can be expressed as:

[0036] d=(m+n+2-rounding_control) / 2 (6),

[0037] Among them: m=A+B, n=C+D.

[0038] When calculating b, d, and e by using the intermediate summation results m and n in the calculation process, the repeated calculation when generating d according to formula 3 is reduced.

[0039] As shown in Figure 2, in h.263 and mpeg4 part2, when using the unrestricted motion vector mode, the edge of the image needs to be expanded. For example, according to h....

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Abstract

This invention relates to an image interpolation method for semi-pixel including: reading four complete pixels of adjacent two lines and two rows in a complete pixel image to compute half pixels utilizing the middle sum values of the same line and same row in the four complete pixel points, which utilizes the relationship among a diagonal half-pixel, a level half pixel and a vertical half pixel to traverse complete pixel images once and output level, vertical and diagonal half-pixel images to reduce the times of access to further reduce the operation of coders. This invention provides a simplified method for forming edge block images.

Description

【Technical Field】 [0001] The present invention relates to a half-pixel image interpolation method, in particular to a half-pixel image interpolation method using the correlation between diagonal half-pixels and horizontal half-pixels and vertical half-pixels. 【Background technique】 [0002] In the video coding standard of very low bit rate, half-pixel images composed of half-pixel points generated in advance in the original image for the convenience of motion estimation or motion compensation. Currently commonly used half-pixel images are mainly divided into: horizontal, vertical and diagonal Three types of half-pixel images. The pre-generated half-pixel image facilitates the sharing of half-pixel data during motion estimation and motion compensation, avoids secondary interpolation calculation, and improves the efficiency of the video encoder. In addition, in the unrestricted motion vector mode, since the motion vector may exceed the range of the original image, it is necessary t...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/46H04N19/587H04N19/80
Inventor 沈艳波高炜邓雄书
Owner YULONG COMPUTER TELECOMM SCI (SHENZHEN) CO LTD
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