Greyscale correction algorithm for stripe edge of filter array multispectral image

Tong Shao Li; Wen Bang Sun; Xin Wei Bai; Di Wu; Pan Feng Zhao; Xiao Kang Zhang

doi:10.1117/12.2655189

2 November 2022 Greyscale correction algorithm for stripe edge of filter array multispectral image

Tong Shao Li, Wen Bang Sun, Xin Wei Bai, Di Wu, Pan Feng Zhao, Xiao Kang Zhang

Proceedings Volume 12455, International Conference on Signal Processing and Communication Security (ICSPCS 2022); 124550E (2022) https://doi.org/10.1117/12.2655189
Event: International Conference on Signal Processing and Communication Security (ICSPCS 2022), 2022, Dalian, China

Abstract

Multispectral cameras of filter array are susceptible to interference streaks at the edges of each band due to the imaging mechanism and process characteristics. Aiming at the problem of interference streaks of multispectral image strips, a new method of grey correction algorithm for stripe edge is proposed. Firstly, determine the coordinates of the effective area of each strip image for strip image cropping; Secondly, a grey scale change function is fitted using the grey scale of pixels in the undisturbed area at the edges of each strip, and the grey scale of pixels in interference area at the edges of the strip is predicted to obtain the fitted pixel grey scale values; Then, the ratio of the grey value of each fitted pixel to the mean grey value of the true pixel is used as the grey correction factor for the corresponding row to eliminate edge interference stripes. Finally, the grey-scale processed images of each strip are stitched together to obtain a consistent grey-scale image of each single band. The theoretical analysis and experimental results show that this method can not only effectively solve the problem of grey-scale interference at the edges of the multispectral images of filter array, and can maintain the spectral information characteristics of the features to the maximum extent.

Citation Download Citation

Tong Shao Li, Wen Bang Sun, Xin Wei Bai, Di Wu, Pan Feng Zhao, and Xiao Kang Zhang "Greyscale correction algorithm for stripe edge of filter array multispectral image", Proc. SPIE 12455, International Conference on Signal Processing and Communication Security (ICSPCS 2022), 124550E (2 November 2022); https://doi.org/10.1117/12.2655189

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KEYWORDS

Image filtering

Multispectral imaging

Image processing

Optical filters

Cameras

Imaging arrays

Bandpass filters

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