SAD arithmetic processing device and method

Abstract

The invention provides an SAD arithmetic processing device and a method, which is applicable to the field of video image encoding and decoding, the SAD arithmetic processing device comprises a pretreatment unit which outputs an original code of a pixel value and a reverse code of another pixel value of each pair of pixel according to the same rule to the current pixel module of the current periodand the pixel in a corresponding position of searching, an iterative summation unit which summates the output of current period of the pretreatment unit and the output of the whole period of the iterative summation unit, and then takes the summation result as an output of the current period of iterative summation unit, and a compensation unit, the output of the iterative summation unit and compensation constant are utilized to calculate SAD value after the pretreatment unit and the iterative summation unit execute a specific number of periodic time. The method of the SAD arithmetic processingmethod of the invention combines the process of seeking difference value & absolute value with the process of seeking accumulative total, which omits the separate step of seeking difference value & absolute value, and saves the hardware resource, reduces consumption of the hardware and fastens the arithmetic speed.

Description

technical field [0001] The invention belongs to the field of video image coding and decoding, and in particular relates to a SAD computing device and computing method. Background technique [0002] Video image data has a strong correlation, and there is a large amount of redundant information. The redundant information is divided into spatial redundant information and temporal redundant information. Compression coding technology is to remove the redundant information in the data and remove the correlation between the data. Compression technology includes intra-frame image compression technology, inter-frame image compression technology and entropy coding compression technology. Among them, the inter-frame image compression technology uses the pixel information and motion vector of the previous frame image to represent the information of the current frame according to the similarity and coherence of the image content in the adjacent frame images. Therefore, only the intra-f...

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Problems solved by technology

[0006] The purpose of the embodiments of the present invention is to provide a SAD operation processing device and method used in a video coding system, aiming at solving the problem of separating the calculation of the absolute value difference and the calculation of the cumulative sum in the SAD operation in the prior art The problem of high hardware consumption, long computing time, and slow computing speed

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