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7 марта 2019 г. 09:50

CCD camera and CMOS camera in optical camera

Optical components are a key component of a machine vision system. The basic function is to transform optical signals into ordered electrical signals. Choosing the right optical waveplate manufacturer camera is also an important part of the design of the machine vision system. The optical camera not only directly determines the image resolution, image quality, etc., but also directly relates to the operating mode of the whole system. The CCD camera provides good image quality and noise immunity. Although the size of the system is increased due to the addition of external circuits, the copying is improved, but the circuit designer can be more flexible and better to enhance the special attention of the CCD camera. performance. 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 cameras have 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 procurement customizable large size optical Window components still dominate the visual inspection program. CCD working principle: CCD is the abbreviation of charge-coupled device. After the photosensitive image point receives illumination, the photosensitive element generates corresponding current. The current magnitude corresponds to the light intensity. Therefore, the electrical signal directly output by the photosensitive element is simulated. In the CCD sensor, each photosensitive element does not further process this, but directly outputs it to the next register, and outputs the analog signal generated by the component to the third register, and so on, until all registers are combined. In order to form a unified output. Since the electrical signal generated by the photosensitive element is too weak and a large amount of voltage loss is generated in the process, the analog-to-digital conversion cannot be directly performed. Therefore, the output data must be uniformly amplified. This task is performed by the CCD sensor. The amplifier is specifically responsible for, after processing by the amplifier, the electrical signal strength of each pixel is increased by the same amplitude; since the signal is amplified by only one amplifier, less noise is generated. Since the CCD procurement high efficiency optical lens parts component itself cannot convert the analog signal directly into a digital signal, it also needs a special analog-to-digital conversion chip for processing, and then outputs it to a dedicated DSP processing chip in the form of a binary digital image matrix. CMOS working principle: CMOS is the abbreviation of complementary metal oxide semiconductor. Each photosensitive element in CMOS sensor directly integrates amplifier and analog-to-digital conversion logic. When the photodiode receives illumination and generates analog electrical signal, the electrical signal is first The amplifier in the photosensitive element is amplified and then directly converted into a corresponding digital signal. In other words, in the CMOS sensor, each photosensitive element can produce a digital output, and the resulting digital signal is combined and sent directly to the DSP chip for processing. The problem is exactly where the amplifier in the CMOS sensor belongs to the analog device. Ensure that the magnification of each image point is kept strictly consistent, so that the enlarged image data cannot represent the original appearance of the captured object - reflected in the output result, that is, a large amount of noise appears in the image, the quality is significantly lower than the CCD sensor, but currently this The technology has been greatly improved.

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