Differences Between The Digital And The Film Camera Part 5

Now all digital cameras of amateur level use one sensor control. Some high-end professional devices (no less than many portable video cameras) use some sensor controls. In them entering light is divided by a prism into a number of bunches, each of which gets on the sensor control. Such technology allows preventing imposing of colors (when borders of red, dark blue and green color are shifted on the image). However similar cameras demand accurater process of production, and because of availability of a prism they more value and are less hardy.

Also in them the improved optics, so the total price of such camera essentially above should be used. That is interesting; use of several sensor controls doesn’t lead to linear growth of quantity of pixels. In the majority of cameras (no less than in multitouch videocameras) it is used three separate sensor control for red, green and dark blue color. Each of them receives 1/3 color information. Thus, at use of three 3 MP sensor controls they will work as one 3 MP a sensor control.

However frequently in digital cameras the mechanism of use of the information received from sensor controls, differs. Actually it depends on model and from the manufacturer. In some three-touch cameras each sensor control grasps 1/3 from the permission of the complete image, and then there is an interpolation.

Other cameras use any combination of the main colors on each sensor control and will involve difficult algorithms for image reception. For example, already not issued Minolta RD-175 has been equipped by three sensor controls two of which were green, and the third was red-dark blue. (Such doubling of a green sensor control reminds technology Bayer Pattern about which it will be told more low).

Each of sensor controls RD-175 contained less than 1 MP, but thanks to the further mathematical transformation the turning out image consisted of 1,7 Megapixels. In many digital cameras only the pixel part reacts to light, therefore it is important to direct as much as possible light on the necessary area of pixel (this phenomenon is called as filling coefficient, fill factor). For this purpose on sensor controls of the majority of cameras of amateur level the microlenses settling down directly over each pixel and directing photons directly on photosensitive area are used. Photons will be transformed in electrons by means of the silicon photo diode which is settling down in the top part of photosensitive area, and the area works as the condenser as possesses possibility of preserving of an electric charge.

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