An optimized gray-scale stretch imaging correction method for contact image sensor line array camera

Huixiong Ruan; Fan Tang; Qiang Qi; Ying Luo

doi:10.1117/12.2616316

8 July 2022 An optimized gray-scale stretch imaging correction method for contact image sensor line array camera

Huixiong Ruan, Fan Tang, Qiang Qi, Ying Luo

Proceedings Volume 12281, 2021 International Conference on Optical Instruments and Technology: Optoelectronic Imaging/Spectroscopy and Signal Processing Technology; 122810B (2022) https://doi.org/10.1117/12.2616316
Event: 2021 International Conference on Optical Instruments and Technology, 2022, Online Only

Abstract

The structure of the imaging system of the contact image sensor(CIS) line array camera is different from that of the ordinary camera. The sensors in the camera are generally bound and encapsulated by multiple independent imaging sensors. The problem of camera non-uniformity exists not only in the independent sensor, but also between each group of sensors. Therefore, in order to solve the problem of non-uniformity in the imaging of the line array camera of contact image sensor, especially the problem of non-uniformity mutation near the stitching gap of each imaging unit of the line array camera, an optimized stretch imaging correction method based on the traditional two-point correction method was proposed in this paper. In this method, multiple images with different exposure times are taken as sample sets and the least square method is used to find the best correction black and white template. Experiments show that the relative error offset of the optimized algorithm is smaller than that of the traditional two-point correction method under different exposure time, and the overall image uniformity is improved by about 40% compared with the traditional two-point correction method in the whole response range. Response near stitching gap transition is more uniform, stitching gap near relative to the traditional two-point method NU most about 50% drop in value, and analyzed the optimization calculation of two-point method is easy to convert the FPGA logic implementation. In the high real-time and wide swath image processing architecture of the large area contact linear array camera, the correction effect can be improved only by modifying the black and white templates of the traditional two-point correction method.

Citation Download Citation

Huixiong Ruan, Fan Tang, Qiang Qi, and Ying Luo "An optimized gray-scale stretch imaging correction method for contact image sensor line array camera", Proc. SPIE 12281, 2021 International Conference on Optical Instruments and Technology: Optoelectronic Imaging/Spectroscopy and Signal Processing Technology, 122810B (8 July 2022); https://doi.org/10.1117/12.2616316

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KEYWORDS

Cameras

Image sensors

Calibration

Data corrections

Imaging arrays

Sensors

Copper indium disulfide

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