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What does the noise of industrial cameras mean

2021-09-15

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The noise of industrial cameras refers to the signals outside the actual imaging target that are not expected to be collected during the imaging process. According to the European camera test standard EMVA1288, the noise in the camera defined can be generally divided into two categories: one is the statistical fluctuation noise that conforms to the Poisson distribution brought by the effective signal, also called shot noise (shot noise) ), this noise is the same for any camera, unavoidable, especially the definite calculation formula. (That is: the square of the noise = the mean of the signal). The second category is the inherent signal-independent noise of the camera itself, which is caused by the image sensor readout circuit, camera signal processing and amplification circuit, etc. The inherent noise of each camera is different. In addition, for digital cameras, quantization noise will be generated when the video signal is converted from analog to analog, and the higher the quantization bit, the lower the noise.

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The signal-to-noise ratio of the camera is defined as the ratio of signal to noise in the image (the ratio of the average gray value of the effective signal to the root mean square of the noise), which represents the quality of the image. The higher the image signal-to-noise ratio, the better the image quality.