High precision digital control LED spot light source used to calibrate camera

Boyu Du; Xiping Xu; Yang Liu

doi:10.1117/12.2178381

13 April 2015 High precision digital control LED spot light source used to calibrate camera

Boyu Du, Xiping Xu, Yang Liu

Proceedings Volume 9522, Selected Papers from Conferences of the Photoelectronic Technology Committee of the Chinese Society of Astronautics 2014, Part II; 952208 (2015) https://doi.org/10.1117/12.2178381
Event: Selected Proceedings of the Photoelectronic Technology Committee Conferences held August-October 2014, 2014, China, China

Abstract

This paper introduces a method of using LED point light source as the camera calibration light. According to the characteristics of the LED point light source, the constant current source is used to provide the necessary current and the illuminometer is used to measure the luminance of the LED point light source. The constant current source is controlled by ARM MCU and exchange data with the host computer though the mode of serial communications. The PC is used as the host computer, it adjust the current according to the luminance of the LED point light source until the luminance achieve the anticipated value. By experimental analysis, we found that the LED point light source can achieve the desired requirements as the calibration light source, and the accuracy is quite better that achieve the desired effect and it can adaptive control the luminance of LED well. The system is convenient and flexible, and its performance is stable and reliable.

Citation Download Citation

Boyu Du, Xiping Xu, and Yang Liu "High precision digital control LED spot light source used to calibrate camera", Proc. SPIE 9522, Selected Papers from Conferences of the Photoelectronic Technology Committee of the Chinese Society of Astronautics 2014, Part II, 952208 (13 April 2015); https://doi.org/10.1117/12.2178381

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