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1/4 sub-pixel interpolation method and device

An interpolation method and sub-pixel technology, which is applied in the field of video coding, can solve the problems of not considering the change rate of pixel brightness value, failing to simulate the change of adjacent pixels well, and failing to obtain coding effects, etc.

Inactive Publication Date: 2011-06-22
深圳市云宙多媒体技术有限公司
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Problems solved by technology

[0005] The purpose of the embodiments of the present invention is to propose a 1 / 4 sub-pixel interpolation method, which aims to solve the problem that the interpolation process in the prior art does not consider the change rate between pixel brightness values, and cannot simulate the change between adjacent pixels well. And then the problem of not being able to achieve a good encoding effect

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Embodiment Construction

[0023] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments. For ease of description, only the parts related to the embodiments of the present invention are shown. It should be understood that the specific embodiments described here are only used to explain the present invention, and are not intended to limit the present invention.

[0024] In the embodiment of the present invention, two integer pixel points A adjacent to the left and right of the sub-pixel point to be interpolated 2 and A 3 Between 1 / 4 sub-pixel interpolation, considering A 2 Integer pixel A on the left 1 and A 3 Integer pixel A on the right 4 value to simulate a 2 The pixel brightness value a 2 and A 3 The pixel brightness value a 3 The variation trend between; the embodiment of the present invention uses two adjacent integer pixels ...

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Abstract

The invention discloses a 1 / 4 sub-pixel interpolation method, which comprises the following steps of: dividing the region between two left and right adjacent integer pixel points (A2 and A3) of a sub-pixel point to be interpolated into four equal parts; working out values of a first slope (k1), a second slope (k2), a third slope (k3) and a fourth slope (k4) of four regions between the integer pixel point A2 and the integer pixel point A3 according to the changing law of four adjacent integer pixels (A1, A2, A3 and A4); obtaining an interpolation coefficient corresponding to the sub-pixel point to be interpolated according to the values of the first slope (k1), the second slope (k2), the third slope (k3) and the fourth slope (k4); and performing the interpolation with 1 / 4 accuracy on the region between a second integer pixel point (A2) and a third integer pixel point (A3) according to the interpolation coefficient. In the invention, the change rate between pixel luminance values is taken into consideration during the interpolation process, and the change between adjacent integer pixels can be well simulated; moreover, the encoding effect is good, and the calculation is convenient.

Description

technical field [0001] The present invention relates to the technical field of video coding, in particular to a 1 / 4 sub-pixel interpolation method and device. Background technique [0002] The current mainstream video coding mainly includes the following steps: each video frame is divided into pixel blocks; [0003] By transforming, quantizing, and entropy coding the video data of each block, the spatial redundancy within the video frame is reduced; the temporal dependency between the blocks of consecutive frames is exploited so that only the different parts between consecutive frames are transmitted. The temporal dependencies of blocks between consecutive frames are determined by employing motion estimation and motion compensation techniques, and for any given block, a motion search is performed before encoding and transmitting the frame to determine the image for which the encoding device and decoding device are predictive blocks The motion vector used for the data. [0...

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Application Information

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IPC IPC(8): H04N7/26H04N7/46
CPCH04N19/0089H04N19/00721H04N7/46H04N7/26H04N19/80H04N19/577
Inventor 张智雄
Owner 深圳市云宙多媒体技术有限公司
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