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Interpolation method for chroma and filter

A technology of interpolation filter and interpolation method, which is applied in the field of video coding and decoding, can solve problems affecting interpolation performance and complex calculations, and achieve the effect of improving interpolation performance

Active Publication Date: 2014-08-06
HISENSE VISUAL TECH CO LTD
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Problems solved by technology

Since the chrominance component in the video is flatter than the luminance component, and considering that the interpolation accuracy of chroma is 1 / 8 pixel, there are as many as 63 types of sub-pixels that need to be interpolated, and the calculation is complicated
The existing chroma interpolation uses simple bilinear interpolation, although the calculation is relatively simple, but it affects the interpolation performance

Method used

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  • Interpolation method for chroma and filter
  • Interpolation method for chroma and filter
  • Interpolation method for chroma and filter

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Embodiment approach

[0029] Such as figure 1 As shown, the interpolation method for chroma of the present application, an implementation thereof, includes the following steps:

[0030] Step 102: Determine the pixel precision of the interpolation. In one embodiment, the pixel precision is 1 / 8 pixel precision.

[0031] Step 104: Determine the coordinates of points to insert sub-pixels between the integer pixels.

[0032] Step 106: According to the coordinates, use a low-tap interpolation filter to perform two-dimensional separation and interpolation on the inserted sub-pixels. In one embodiment, the low-tap interpolation filter comprises a four-tap interpolation filter.

[0033] In one embodiment, two-dimensional separation interpolation is performed on the inserted sub-pixels according to the coordinates, specifically including:

[0034] For sub-pixels between horizontally adjacent integer pixels, horizontal one-dimensional interpolation filtering is performed;

[0035] For sub-pixels between ...

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Abstract

The invention discloses an interpolation method for chroma. The method includes: determining the pixel precision of interpolation; determining the coordinates of an interpolation sub-pixel between integer pixel points; using a low-tap interpolation filter to perform two-dimensional separation interpolation on the interpolation sub-pixel according to the coordinates. The invention further discloses a filter. Due to the fact that the coordinates of the interpolation sub-pixel is determined between the pixel points and the low-tap interpolation filter such as a four-tap interpolation filter is used to perform two-dimensional separation interpolation on the interpolation sub-pixel according to the coordinates, interpolation performance is increased for bilinear interpolation.

Description

technical field [0001] The present application relates to the technical field of video encoding and decoding, and in particular to a sub-pixel interpolation method and filter for chroma. Background technique [0002] With the gradual popularization of many high-definition digital products such as digital TV, Internet high-definition video, digital camera, digital video camera, etc., the existing video codec standards can no longer meet the requirements, especially for high-resolution video, such as 4Kx2K very high resolution . Therefore, people look forward to the development of a new generation of high-performance video coding standards that can adapt to ultra-high-definition video. [0003] In the video coding and decoding technology, the sub-pixel interpolation technology can improve the accuracy of motion prediction, which has a very positive effect on the improvement of the entire coding and decoding performance. Sub-pixel interpolation was first used in MPEG-1, but i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/587H04N19/523
Inventor 王荣刚吕浩王振宇董胜富高文
Owner HISENSE VISUAL TECH CO LTD
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