Get to know the carCameraThe imaging principle of CCD, the process of CCD imaging is as follows: The silicon semiconductor photosensitive element coated on the surface of the CCD captures photons and generates photo-generated electrons. These electrons are first accumulated in the insulating layer under the CCD, and then controlled by the control circuit in a serial manner. Export to the analog-digital circuit, and then form an image through DSP and other imaging circuits. The biggest difference between fast scan and slow scan lies in the speed of photoelectron export and the circuit system. Fast scan exports electrons at a very fast frequency in order to achieve a video-level refresh rate, but this will result in loss of electrons, increased noise, and incomplete emptying of photogenerated electrons. On the contrary, slow scan is the opposite. Its circuit design focuses on the accumulation of photogenerated electrons. In terms of protection, the derived frequency is not high, but it ensures that the loss and loss of electrons during the transmission process are minimized. Its analog-to-digital converter has extremely high dynamic range and sensitivity, which ensures that the signal conversion process is not distorted, and at the same time, in order to reduce thermal effects The noise generated is generally cooled by the Cooling system.
After reading the above explanation, we can know why professional-grade scientific research cameras are so expensive, starting from the material and area of the CCD photosensitive layer, to the accumulation of photo-generated electrons, to electronic export circuits, transmission circuits, analog-to-digital conversion circuits, and images. The display circuit, the cooling circuit, and the craftsmanship of the professional-grade scientific research camera at each step are different from those of the civilian-grade, and the cost is tens to hundreds of times. There is only one purpose, the professional camera can collect all the optical signals as completely as possible. Generally speaking, a car camera or digital camera can only reflect less than 50% of the light signal.
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