Realization of the FPGA based TDI algorithm in digital domain for CMOS cameras

Shuping Tao; Guang Jin; Xuyan Zhang; Hongsong Qu

doi:10.1117/12.976025

15 October 2012 Realization of the FPGA based TDI algorithm in digital domain for CMOS cameras

Shuping Tao, Guang Jin, Xuyan Zhang, Hongsong Qu

Proceedings Volume 8419, 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optoelectronic Materials and Devices for Sensing, Imaging, and Solar Energy; 841930 (2012) https://doi.org/10.1117/12.976025
Event: 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT 2012), 2012, Xiamen, China

Abstract

In order to make the CMOS image sensors suitable for space high resolution imaging applications, a new method realizing TDI in digital domain by FPGA is proposed in this paper, which improves the imaging mode for area array CMOS sensors. The TDI algorithm accumulates the corresponding pixels of adjoining frames in digital domain, so the gray values increase by M times, where M is for the integration number, and the image’s quality in signal-to-noise ratio can be improved. In addition, the TDI optimization algorithm is discussed. Firstly, the signal storage is optimized by 2 slices of external RAM, where memory depth expanding and the table tennis operation mechanism are used. Secondly, the FIFO operation mechanism reduces the reading and writing operation on memory by M×(M-1) times, It saves so much signal transfer time as is proportional to the square of integration number M², that the frame frequency is able to increase greatly. At last, the CMOS camera based on TDI in digital domain is developed, and the algorithm is validated by experiments on it.

Citation Download Citation

Shuping Tao, Guang Jin, Xuyan Zhang, and Hongsong Qu "Realization of the FPGA based TDI algorithm in digital domain for CMOS cameras", Proc. SPIE 8419, 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optoelectronic Materials and Devices for Sensing, Imaging, and Solar Energy, 841930 (15 October 2012); https://doi.org/10.1117/12.976025

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KEYWORDS

CMOS sensors

CCD image sensors

Field programmable gate arrays

Charge-coupled devices

Digital imaging

Image sensors

Imaging arrays

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