Xidian University

Kuanhong Cheng

Huan Li

Jun Zhou

Xiuping Jia

Huixin Zhou

Bingjian Wang

Dong Zhao

Bo Yao

Jiangluqi Song

Hanlin Qin

Yue Yu

Runda Qian

Lixin Guo

Yangqun Jin

Shenghui Rong

Kun Qian

Maosen Huang

Juan Du

Shangzhen Song

An interframe registration and adaptive step size-based non-uniformity correction method for an infrared image, comprising: first calculating a normalized cross-power spectrum of n-th and (n&#x2212;1)-th original infrared images with the non-uniformity, and then calculating a horizontal relative displacement and a vertical relative displacement of the n-th and (n&#x2212;1)-th original infrared images with the non-uniformity; calculating a space variance and a time variance of each pixel of the n-th original infrared image with the non-uniformity, using the obtained space variance and time variance to calculate an adaptive iterative step size of each pixel of the n-th original infrared image with the non-uniformity, and using the iterative step size to update a gain correction coefficient and a bias correction coefficient; finally, performing non-uniformity correction on the pixel in an overlapping area of the n-th and (n&#x2212;1)-th original infrared images with the non-uniformity.

Interframe registration and adaptive step size-based non-uniformity correction method for infrared image

A non-uniformity correction method for an infrared image based on guided and high-pass filtering includes: assigning high-frequency component of first image frame of original image sequence to first fixed pattern noise f; successively loading N-th image frame of the original image sequence with non-uniformity as current image frame, determining a difference between the current image frame and (N&#x2212;1)-th image frame to obtain (N&#x2212;1)-th differential image frame, and obtaining a relative change amplitude of each image element of (N&#x2212;1)-th image frame according to the (N&#x2212;1)-th differential image frame; and performing high-pass filtering based on a combination of a high-frequency component of the current image frame obtained through guided filtering and the relative change amplitude to obtain n-th fixed pattern noise f, and performing non-uniformity correction on the current image frame according to fto obtain a correction result of the current image frame, where N&#x2265;2, n&#x2265;2.

Non-uniformity correction method for infrared image based on guided filtering and high-pass filtering

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Xi'an, China

Kuanhong Cheng