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Home > News > How to Choose the Resolution of Industrial Cameras - Dushen Technology
How to Choose the Resolution of Industrial Cameras - Dushen Technology
Release time:2019-12-17
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How should the resolution of an industrial camera be ?
The specific choice of resolution of industrial cameras needs to be based on the needs of the system to choose the size of the camera resolution, the following is a case study.
Application case:
Assuming that the surface scratch of an object is detected, the size of the object required to be shot is 10 x 8mm, and the required detection accuracy is 0.01mm. First of all, assuming that we want to shoot a field of view range of 12 x 10mm, then the  resolution of the camera should be  in: (12/0.01) x (10/0.01) x 1200 x 1000, about 1.2 megapixels of the camera, that is, a pixel corresponding to a detection defect, then the resolution must be no less than 1.2 million pixels on the market, but the common is 1.3 million pixels of the camera  100 000 pixels of the camera. But the practical problem is, if a pixel corresponds to a defect, then such a system will be extremely unstable, because casually a interference pixel can be mistaken for a defect, so in order to improve the accuracy and stability of the system, it is best to take the area of the defect in 3 to 4 pixels or more, so we choose The camera is also more than 1.3 million times 3, that is, the can not be less than 3 million pixels, usually using 3 megapixel camera for the best (I have seen the most people holding sub-pixels do not say to do zero sub-pixels, then do not need such a high-resolution camera.) For example, they say that if 0.1 pixels, is a defect corresponding to 0.1 pixels, the size of the defect is calculated by the number of pixels, ask the area of 0.1 pixels how to represent? These people use sub-pixels to fool people, often shows that they do not have common sense). In other words, we are only used for measurement, then the use of sub-pixel algorithm, 1.3 megapixel camera can basically meet the demand, but sometimes because of the impact of edge clarity, when extracting the edge, casually offset a pixel, then the accuracy is greatly affected. Therefore, we choose 3 million cameras, but also allow the extracted edge deviate from about 3 pixels, which is a good guarantee of accuracy of measurement.  
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