Title :
Research on the Digital Test of TV Camera´s Signal to Noise Ratio
Author :
Lingfeng, Chen ; Yue, Wang ; Xiaodi, Zhang ; Jiaming, Lin
Author_Institution :
Beijing Inst. of Technol., Beijing
Abstract :
This paper presents a quick and objective signal-to-noise ratio (SNR) digital test method for TV camera. Through imaging an overall white transparent test chart with high evenness illumination, the fluctuation of the output video signal reveals the existence of the noise. Using the frame grabber to digitalize the analogue video signal to digital image, the noise can be separated and stood out by digital high pass filter and its amplitude is calculated as root-mean-square (RMS) value. Because the frame grabber introduces additional quantization noise to the digital image, the SNR of the original video signal can be calculated after correcting the quantized noise. The SNR digital test system can get an objective measurement as well as high repeatability, and the results obtained are consistent with those produced by industry standard instrument, so it can be used as a replaceable method for camera´s SNR testing.
Keywords :
digital filters; electronic equipment testing; high-pass filters; television cameras; video signal processing; SNR testing; TV camera; analogue video signal; digital high pass filter; digital image; digital test method; evenness illumination; frame grabber; output video signal; quantization noise; root mean square value; signal to noise ratio; Digital cameras; Digital filters; Digital images; Fluctuations; Lighting; Noise level; Quantization; Signal to noise ratio; System testing; TV; TV camera; digital test; signal to noise ratio;
Conference_Titel :
Electronic Measurement and Instruments, 2007. ICEMI '07. 8th International Conference on
Conference_Location :
Xi´an
Print_ISBN :
978-1-4244-1136-8
Electronic_ISBN :
978-1-4244-1136-8
DOI :
10.1109/ICEMI.2007.4351055
