A Method for Infrared Complex Background Suppression Based on Joint Filtering

Abstract

The invention provides an infrared complicated background inhibiting method based on combined filtering. The method comprises the following steps of: S1, determination of the dimensions of morphological structural elements; S2, spatial background inhabitation: spatial primary inhabitation of an infrared complicated background is realized by utilizing the gray-scale morphological top-hat transform on the basis of the self-adapting structural elements; S3, non-subsampled contourlet transform: the non-subsampled contourlet first-level factoring is carried out on infrared images subjected to background primary inhibition by a space domain method, wherein a bandpass subband is factored into four high-frequency directions; S4, high-frequency coefficient reconstruction: the low-frequency influence is eliminated, and each high-frequency direction coefficient is calculated again on the basis of neighborhood average values; S5, high-frequency coefficient central vector construction: the average value of each high-frequency coefficient in each spatial position and in the four directions is calculated, and the high-frequency coefficient central vector is formed; and S6, non-subsampled contourlet domain background inhibition. The infrared complicated background inhibiting method solves the problem of infrared complicated background inhibition in typical environments, and lays a good foundation for the subsequent target detection.

Description

technical field [0001] The invention relates to an infrared complex background suppression technology, specifically, it is applicable to the typical environment such as air space, open ground, sea surface, etc. in the detection of long-distance infrared weak and small targets, and the complex background suppression is carried out by using the joint filtering of the air domain and the non-subsampled contour wave domain Methods. Background technique [0002] For practical application systems, how to give full play to the advantages of infrared target detection technology and strive to obtain relevant information of incoming targets at the most powerful time has become an important factor in determining the outcome of modern warfare. Therefore, increasing the detection distance of the target as much as possible has become a problem of great concern to researchers from all over the world. The farther the distance is, the smaller the imaging area of ​​the target on the detection...

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