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1. Choose CCD or CMOS camera according to different applications
CCD camera is mainly used in the image extraction of moving objects, such as the mounter machine vision, of course, with the development of CMOS technology, many mounters are also in the use of CMOS camera. CCD camera is more commonly used in the scheme of automatic visual inspection or in the industry. CMOS cameras are widely used due to their low cost and low power consumption.
2. Selection of resolution
Firstly, the precision of the object to be observed or measured is considered, and the resolution is selected according to the precision. Camera pixel accuracy = single-direction field of view/single-direction camera resolution. Then the single-direction resolution of the camera is equal to the single-direction visual field/theoretical accuracy.
If the single field of view is 5mm long and the theoretical accuracy is 0.02mm, the single-direction resolution =5/0.02=250. However, in order to increase the stability of the system, it is not necessary to use one pixel unit to correspond to one measurement/observation accuracy value. Generally, multiples of 4 or higher can be selected. In this way, the camera needs a single-direction resolution of 1000, and 1.3 megapixels is enough. Second look at the output of the camera, if the posture observation or machine software analysis recognition, high resolution is helpful; If VGA output or USB output, observe on the display, it also depends on the resolution of the display, camera resolution again high, display resolution is not enough, is meaningless; Using memory cards or photo functions, a high resolution camera is also helpful.
3. Match with the lens
The sensor chip size should be less than or equal to the lens size, and the C or CS mounting mount should also match (or add a transfer port);
4. Select the number of camera frames
When the object under test has motion requirements, the camera with high frame number should be selected. But generally the higher the resolution, the lower the number of frames.
