This is an article describes the basic concepts of CCD and CMOS and chip size and the image of the article, which pixels enough theory for analysis of today's point of view seems somewhat conservative, is a good introductory article.
A colleague of mine is going to buy a digital camera, like Sony's DSC-P92 on the grounds that such product 500 mega pixel level, as long as the $ 3000, cost-effective enough.
Many ordinary consumers, just like the old colleagues, in the choose a digital camera, the first glance of CCD pixel number is, the second eye also tend to be the last time, to see is the price. Both the determination of the Chinese and the purchase of the basic set up under. However, this was many consumers value the CCD has many ordinary consumers do not know the secret. Exactly how many pixels CCD, CCD? English abbreviation, ChargeCoupledDevice Hansard "charge-coupled device". From a functional point of view, it is responsible for the lens of optical signals into electrical signals, similar to an ordinary optical camera film. CCD photoelectric conversion through many of the above with CCD sensor point (MOS capacitors). A picture is the one of the PC points to describe their color, brightness and gamma. On the CCD sensor, we usually another describes as "pixels". In theory, the more pixels, the shooting will be able to be filming of video get more sophisticated, a description of the image will also be more granular. That is, to improve the image resolution, the most direct way is to increase the number of pixels, that is, the number of CCD sensor point. For this reason, the number of CCD pixels that make up digital camera imaging quality of an extremely important decision factors — even, is the vast majority of people deemed to be the only important parameters, especially in ordinary consumers there, "the only pixel theory" has become a mainstream consumer attitudes. At the beginning of the case, that of my colleagues, it is 500 megapixels and even zoom capability and NiMH batteries can be tolerated. So, in practice, we should think of the number of pixels? someone says, if you want to reach general 35mm optical camera picture quality, digital camera pixels at least to do the above. It's another layer of meaning seems to be, even if the level of top-grade 600 mega pixel digital camera, its home imaging quality with ordinary optical cameras compared. But that's not entirely true that the above comparison is unfair, because all everything depends on our application. In some specific sectors, such as publishing, imaging, advertising industry, they often need to picture. On this application, the most advanced million pixel-level digital cameras, compared with traditional optical camera, but also to make ends meet. While in the home area, but very few have photo enlarged to 7 inch above needs — even if 7 inch photos, mega and fully meeting their needs. Listed below are a set of resolution, pixel and the relationship between the actual Imaging size: 600 × 800 = 48 megapixels = 3-inch photo 700 x 1000 = approximately 80 megapixels = 5 inch photos (3.5 × 5 inches, mm size 89 x 127); 800 × 1200 = about 100 megapixel = 6 inch photos (4 x 6 inches, mm specifications 102 × 152); 1000 x 1400 = approximately 150 megapixels = 7 inch photos (5 × 7 inches, mm specifications, 127 x 178); 1200 × 1600 = about 200 megapixel = 8 inch photos (6 x 8 inches, mm specifications 152 × 203); 1600 x 2000 = $ 310 m pixel = 10-inch photo (8 x 10 inches, mm specifications 203 × 258); 1600 x 2400 = approximately 400 megapixel = standard photo (8 x 12 inches, mm specifications 203 × 304); 1600 × 2800 = approximately 400 megapixel = wide photo (8 x 14 inches, mm specifications 203 × 356). (Note: the above resolution is the appropriate size photos need resolution, may be related to a digital camera can adjust the resolution level slightly different. In General, the resolution of the picture is the product of the number of pixels. In the same phase of prime numbers, the imaging of maximum size also generally. For example, 300 m pixel products, its adjustable resolution grades in digital camera may appear to 2048 × 1536, may also be manifested in 1600 × 2000. ）
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