Noise in industrial cameras refers to signals that are not intended to be collected during the imaging process and are outside the actual imaging target.According to the European camera testing standard EMVA1288, the noise in the defined camera can generally be divided into two categories: one is statistical fluctuation and fall noise that conforms to the Poisson distribution brought by effective signals, also called shot noise. This noise is the same for any camera, and is inevitable, especially a certain calculation formula.(That is: the square of the noise = the mean of the signal).The second type is the inherent signal-independent noise of the camera itself. It is noise caused by image sensor reading circuits, camera signal processing and amplification circuits, etc. The inherent noise of each camera is different.In addition, for digital cameras, quantization noise will be generated when analog conversion of video signals, and the higher the number of quantization bits, the lower the noise.