Method for convolving symmetrical convolution kernel of video/audio signal by applying SSE (Streaming SIMD Extension) instruction set

Abstract

The invention belongs to a video and image processing technology, in particular relates to a method for convolving a symmetrical convolution kernel of a video / audio signal by applying an SSE (Streaming SIMD Extension) instruction set. The method comprises the following steps of: dividing a floating-point signal sequence S(n) of an audio input signal into a left interval, a middle interval and a right interval and carrying out convolution processing on the left interval and the right interval by using a common C language algorithm; and carrying out convolution processing on a signal in the middle interval by utilizing the SSE instruction set according to one group of every four adjacent points. In the method, the symmetrical characteristic of the convolution kernel is utilized, and half multiplication calculation is effectively reduced; in addition, because the SSE instruction set can calculate four points once, the number of the instructions is effectively reduced, no any conditional transfer instruction exists in concrete processing, and the production line of a CPU (Central Processing Unit) can be more fully utilized.

Description

technical field [0001] The invention belongs to video and image processing technologies, and in particular relates to a method for performing convolution on a symmetrical convolution kernel of video and audio signals by using an SSE instruction set. Background technique [0002] In image / video processing software, it is often necessary to perform one-dimensional convolution on some video and audio signals, and these signals are often floating-point numbers (usually single-precision floating-point numbers), and the convolution kernel is symmetrical. Since this kind of convolution processing will be relatively frequent, a large part of the calculation of many algorithms is consumed in convolution. If the convolution is simply implemented in C language, the efficiency may not meet the requirements of the algorithm. [0003] The concept of convolution involved in the present invention is firstly introduced below. If there is a discrete floating-point convolution kernel K(n), th...

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Problems solved by technology

[0008] The purpose of the present invention is to aim at the defect that the symmetric convolution kernel of video-audio signal is convoluted at present purely using C language, provides a kind of method that uses SSE instruction set to carry out convolution to the symmetric convolution kernel of video-audio signal, Thereby speeding up the convolution calculation

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