Digitized test method for CCD camera signal-to-noise ratio
A test method and camera technology, applied in image communication, TV, color TV components, etc., can solve the problems of relying on the operator's subjective judgment ability, high test cost, etc., and achieve the effect of low-cost and accurate measurement
Inactive Publication Date: 2008-01-23
BEIJING INSTITUTE OF TECHNOLOGYGY
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The present invention provides a digitized testing method for the signal-to-noise ratio of a CCD video camera. The fundamental principle of the present invention is that the video camera images the high- uniform illuminating white and clean target, and the fluctuation of the imaging signal reflects the noise of the video camera. The video signal is quantified into a digital image through an image acquisition card, the noise signal is separated by a specially designed digital high-pass filter, and the root-mean-square value of the noise signal is calculated as the noise intensity. The image acquisition card brings a quantizing noise into the original video signal, the quantizing noise is modified to estimate the value of the noise in the original video signal, and thereby the signal-to-noise ratio can be worked out. The present invention achieves the fast speed and objective testing method of the television camera signal-to-noise ratio based on digital image acquisition, the testing result is as good as the result of the video analyzer, thus the method can be used as a replacement method for video camera signal-to-noise testing.
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