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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Problems solved by technology

But the required filters cost close to $10,000
Therefore, the above measurement methods have

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  • Digitized test method for CCD camera signal-to-noise ratio
  • Digitized test method for CCD camera signal-to-noise ratio
  • Digitized test method for CCD camera signal-to-noise ratio

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[0036] The present invention will be further described below in conjunction with the drawings and embodiments. For the convenience of explanation, an 8-bit frame grabber is used as an example to introduce:

[0037] As shown in Figure 1, the CCD camera signal-to-noise ratio digital test system designed according to the present invention is mainly composed of uniform lighting light box 1, to-be-tested CCD camera 2, image acquisition card 3, computer 4 and oscilloscope 5 for auxiliary reading. .

[0038] The basic implementation process is: the camera 2 shoots the transmissive target at the exit of the uniformly illuminated light box 1, and the fluctuation in the imaging signal reflects the noise of the camera 2. The video signal of the camera 2 is quantized into a digital image by the image capture card 3 and sent to the computer 4 for processing. A specially designed digital high-pass filter is used to separate the noise signal, and the root mean square value of the noise is calcul...

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Abstract

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.

Description

technical field [0001] The invention belongs to the performance evaluation of a discrete photoelectric imaging system in the field of photoelectric testing, realizes a digital objective measurement method for the signal-to-noise ratio of a CCD camera, and is applied to the evaluation of a visible light CCD camera. Background technique [0002] According to IEC1146-1:1994 "Camera Measurement Method: Non-Broadcast Single-Sensor Camera", the signal-to-noise ratio measurement method is: connect the video clutter measuring instrument at the output end of the camera, disconnect the automatic control and correction circuit in the camera channel , Connect the 6MHz low-pass filter and 100KHz high-pass filter of the video clutter measuring instrument, the camera captures the grayscale test chart of EIAJ-C3, so that the video signal amplitude at the output end of the camera is 100% white level, and the video clutter measurement Read the signal-to-noise ratio on the instrument. [0003...

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Application Information

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IPC IPC(8): H04N17/00H04N5/225
Inventor 陈凌峰张旭升周桃庚何川沙定国林家明王玥张晓迪孙若端
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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