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8 марта 2019 г. 09:43

Talking about the selection of optical camera

Image processing, the object of processing is the image from the procurement high efficiency thin-film multilayer optical filter, so the choice of optical camera, industrial camera, industrial camera is an indispensable and very important step. The first thing to understand is whether your own detection task is static or dynamic, how often is the photo taken, whether it is defect detection or size measurement or positioning, what is the size of the product (field of view), how much precision needs to be used, and what is used. Software performance, on-site environmental conditions, and other special requirements. If it is a dynamic photo, what is the speed of the movement, choose a small exposure time according to the speed of movement and whether the camera needs to be scanned progressively; and the camera's rate (high camera frequency) is related to the pixel, usually the higher the resolution, the lower the rate. The optical frequencies of different brands of optical cameras are slightly different; the resolution of the required optical camera can be calculated according to the different inspection tasks, the size of the product, the resolution required, and the performance of the software used; the temperature of the field environment is to be considered. Choose a different purchasing laser grade optical prism for humidity, interference, and lighting conditions. 1. CCD or CMOS The CCD provides good image quality and noise immunity. Although the size of the system is increased due to the addition of external circuits and the copying is improved, the circuit designer can be more flexible and better enhance the performance of the CCD camera with special attention. . CCD is more suitable for applications where camera performance is very high and cost control is not strict, such as astronomical, high-definition medical X-ray images, other applications that require long-time exposure and strict image noise requirements. CMOS has the advantages of high yield, high integration, low power consumption and low price. But the noise of the image itself is more. The current CMOS technology is constantly evolving, and has overcome many of the early shortcomings, and has developed a level that can be compared with CCD technology in terms of image quality. CMOS is suitable for applications where space is small, size is small, power consumption is low, and image noise and quality requirements are not particularly high. Such as industrial inspection applications for most auxiliary lighting, security security applications, and most consumer commercial digital cameras. At present, CCD optical cameras still dominate the visual inspection program. 2. The right resolution According to the accuracy requirements of the target, the pixel precision of the camera is reversed. Camera unidirectional resolution = single direction field of view divided by theoretical accuracy. For example, for a field of view size of 10*10mm, the required accuracy is 0.02mm/pixel, then the resolution in the direction is 10/0.02=500. However, considering the distortion of the camera's edge field of view and the stability requirements of the system, it is generally not only Use one pixel unit to correspond to one measurement accuracy value, generally choose a multiple of 4 or higher, so the camera's single-direction resolution is 2000, the camera's resolution = 2000 * 2000 = 4 million, so the 5 megapixel camera can be used to meet . 3. Sufficient camera frame rate When the measured object has motion requirements, it is necessary to select an procurement optical lens manufacturer/supplier with a higher number of frames. Generally, the higher the resolution, the lower the number of frames. 4. The right lens The size of the supported lens of the selected lens should be greater than or equal to the size of the camera CCD sensor chip. In addition, the mounting base should match the C, CS or F type interface, and consider the working distance of the lens, and whether there is enough space.

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