CCD sensor principle Working principle of CCD image sensor Answer: In the current and future DC products with single CCD image sensor, there will never be products of the same level as silver halide film. Those who use traditional cameras can be happy! Why? Because, we not only care about the resolution of photos, I think DX cares most about the color! Color restoration and expression. From the basic working principle, a single CCD cannot collect 100% of the colors reflected on its photosensitive surface, while silver halide film can record 100% of all the colors and light reflected on it (note that the colors I am talking about here are visible to the human eye, not invisible, and invisible silver halide film cannot collect most of the colors). In order to make everyone understand what I am saying, I will start with the working principle of CCD: The full name of CCD is \"Charge Coupled Device\", which means charge coupled device, a special semiconductor. Due to the high technical content of research and manufacturing, few factories can produce it. The three CCD brands with the strongest capabilities and large output are only Kodak, Sony, and Philips. CCD image sensor consists of three layers: the first layer, micro lens; the second layer, color filter; the third layer, photosensitive element. Each photosensitive element of CCD image sensor consists of a photodiode and a storage unit that controls adjacent charges (I mentioned it in the previous article). Phototubes are of course used to capture photons. They convert photons into electrons. The stronger the light collected, the more electrons are generated. The stronger the electronic signal, the easier it is to record and the less likely it is to be lost, and the richer the image details. So if you want to make the image good, the photosensitive part of the phototube must be made larger. Wouldn\'t it be possible to absorb more light if the phototube is made bigger? This is a good way. If a 2/3-inch CCD is made into 4 million pixels, then each phototube will be larger than a 2/3-inch CCD made into 5 million pixels. The image quality is of course good. But high pixels are the direction of development. How can the image from a 5-million-pixel 2/3-inch CCD be better than the image from a 4-million-pixel 2/3-inch CCD? Here we need to introduce the concept of aperture ratio: it is impossible for all parts of a photoelectric tube to absorb photons. When the photosensitive element is arranged in an area array...
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