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Picture element interpolation method

A technology of pixel interpolation and pixel sampling, which is applied in the field of video image encoding and decoding, can solve problems such as complex system structure, cumbersome program, and low efficiency, and achieve the effects of simplifying program and system structure, reducing filtering links, and improving efficiency

Inactive Publication Date: 2007-01-03
SICHUAN CHANGHONG ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to propose a simpler pixel interpolation method based on the AVS standard for the shortcomings of the existing pixel interpolation method, such as cumbersome procedures, large amount of calculation, low efficiency, and complex system structure.

Method used

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Examples

Experimental program
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Embodiment

[0037] figure 1 A schematic diagram of pixel interpolation of this example is shown.

[0038] 1. The 1 / 4 sample marked aa in the figure is obtained by:

[0039] ① First, use the five-tap filter F3 to filter the five integer pixel samples A, B, C, D, and E in the horizontal direction closest to the current interpolation sample, and obtain the intermediate value aa', as follows:

[0040] aa'=(-A-2B+96C+42D-7E)

[0041] ② The final predicted value aa can be obtained according to the following formula:

[0042] aa=Clipl((aa'+64)>>7)

[0043] 2. The 3 / 4 sample marked bb in the figure is obtained by:

[0044] ① First, use the five-tap filter F4 to filter the five integer pixel samples A, B, C, D, and E in the horizontal direction closest to the current interpolation sample to obtain the intermediate value bb', as follows:

[0045] bb'=(-7A+42B+96C-2D-E)

[0046] ② The final predicted value bb is calculated according to the following formula:

[0047] bb=Clipl((bb'+64)>>7)

...

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Abstract

An interpolating method of pixel includes filtering pixel sample by five-tap filter to obtain intermediate value, normalizing intermediate value and clamping normalized value in range of [ 0, 255 ] for obtaining prediction value of pixel interpolation.

Description

technical field [0001] The invention relates to video image encoding and decoding technology, in particular to a pixel interpolation method. Background technique [0002] At present, in some video standards, 1 / 2 pixel interpolation and 1 / 4 pixel interpolation are generally used in order to obtain a higher-precision prediction value, reduce the size of the motion compensation residual, and reduce the bit rate. However, interpolation, especially 1 / 4 pixel interpolation, is computationally intensive and time-consuming, and is an important factor affecting the execution speed and efficiency of codec programs. In the traditional video standard, 1 / 4 pixel interpolation is achieved in two steps, that is, first obtain 1 / 2 pixel interpolation through a multi-tap filter, and then filter 1 / 2 pixel interpolation through another multi-tap filter to obtain 1 / 2 4 pixel predicted value. In this pixel interpolation method, a 1 / 4 pixel interpolation not only requires two multi-tap filters t...

Claims

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Application Information

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IPC IPC(8): H04N7/32H04N19/117H04N19/80
Inventor 刘明华展华益
Owner SICHUAN CHANGHONG ELECTRIC CO LTD
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