A modulation method that can improve the performance of LED multi-spectral imaging

In the LED multi-spectral imaging (LEDMSI) system, modulation by using the square wave frequency division with frequency ratio of 2 can improve the image quality and acquisition speed, but it will occupy a wide frequency band. Moreover, since there is a simultaneous change in the state of multiple signals when this method is used, it will lead to serious ringing phenomenon or insufficient slew rate and affect the quality of multi-spectral images. To solve the above problems, this paper proposes a modulation method for LEDMSI system, which uses n same frequency square wave signals with different phases as the carrier signals. Comparing the multi-spectral images modulated by the proposed method with the multi-spectral images modulated by the traditional method, experimental results show that the quality of the image modulated by the proposed method is higher, which indicates that the proposed method is of great significance to improve the performance of LEDMSI system.

Automated summary

In the LED multi-spectral imaging (LEDMSI) system, modulation using square wave frequency division with a frequency ratio of 2 can improve image quality and acquisition speed, but it occupies a wide frequency band. This paper proposes a modulation method using multiple square wave signals with different phases as carrier signals to solve the above problems. Experimental results show that the proposed method improves the quality of multi-spectral images, indicating its significance in improving the performance of the LEDMSI system.