Image filtering method and system

Abstract

The invention provides an image filtering method and system. The image filtering method comprises the following steps that horizontal forward filtering is carried out on all pixel points of an image;after horizontal forward filtering of the pixel points in an a-th row is completed, horizontal reverse filtering is carried out on the filtered pixel points; after horizontal reverse filtering of thepixel points in a bth row is completed, vertical forward filtering is carried out on the filtered pixel points; after vertical forward filtering of a kth pixel point is completed, vertical reverse filtering is carried out on the filtered pixel points; and the filtered image is output. Because the filtering in each direction is started when the filtering in the previous direction is being carried out, the operation time is reduced while the filtering direction and frequency are not reduced, and the cache and delay in the filtering operation process are reduced; and meanwhile, filtering processing is divided into independent processing in four directions, so that the complexity of filtering operation is reduced. Therefore, the image filtering method and system provided by the invention solvethe problems of large cache, high delay and complex operation in image filtering.

Description

technical field [0001] The invention relates to the technical field of image and video signal processing, in particular to an image filtering method and system. Background technique [0002] FIR and IIR filters are often used in image processing. FIR filter, called finite-length unit impulse response filter, also known as non-recursive filter, is the most basic component in digital signal processing system. It can guarantee arbitrary amplitude-frequency characteristics while having strict linear phase Frequency characteristics, and its unit sampling response is finite, so the FIR filter is a relatively stable system. The IIR filter adopts a recursive structure, that is, there is a feedback loop in the structure. The IIR filter operation structure is usually composed of basic operations such as delay, multiplication coefficient and addition, which can be combined into four structural forms: direct type, positive type, cascaded type, and parallel type, all of which have feed...

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Problems solved by technology

[0005] The purpose of the present invention is to provide an image filtering method and system to solve the problems of large cache, high delay and complex operation in image filtering under the premise of ensuring the filtering effect

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