CFAK-matrix
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[edit] CFAK-matrix
CFAK-matrix(abbr. from English Color Filter Array Kodak - a file of color filters Kodak) - a mosaic of red, green, dark blue, white photo diodes) or a CFA-sensor control (abbr. from English Color Filter Array - a file of color filters) - a matrix of company Kodak c a cell, differing standard sensor controls with Bayer's filter presence of additional photo diodes without the optical filters reacting to all spectrum of radiation.
CFAK-matrix
The CFAK-matrix has three variants of an arrangement of color detectors RGBW (abbr. from English Red Green Blue White-with a various mosaic расположеия them in cells of a matrix-RGBW*1, RGBW*2, RGBW*3. Figure of one variant of cells of an RGBW*1-CFAK-matrix. See a site http: // en.wikipedia.org/wiki/Color_filter_array. Category CFAK a matrix-more is convenient at separate discussion, for example, only the raster matrix from photosensitive photo diodes on the basis of оксида silicon not concerning the electronic scheme of reading and numbering of analog potential, т.е is not present necessity to consider a photosensor control as a whole.
Figure of a variant of cell RGBW*1 CFAK-matrixDifferences from traditional matrixes CCD, CMOS
In traditional matrixes, are used cells RGB with three types of photosensitive elements - "red", "green" and "dark blue", - covered by corresponding optical filters. Thus, generally about 2/3 light streams it is absorbed by these filters, that is it is lost.
Better and lacks
In connection with presence in cells CFA Ê-matrixes of "white" photo diodes (without filters) -they accept all visible spectrum of radiation. And as they contain up to half of "white" detectors allow to reduce losses of light approximately to half, that is up to 1/3. Therefore the matrixes made on new technology, possess the best parity a signal-noise on same values ISO. In conditions at illumination with a narrow spectrum of the radiation, close to illumination with панхроматическими rays of light, in CFA Ê-matrixes on red illumination it will be effective to react 5/8 from the general number of photosensitive cells, (1/8 "red" and 1/2 "white" in a share from their general number). And this advantage of sensor controls CFA at their use in such conditions invaluably. Possible losses of fine color details concern to lacks CFA Ê-matrixes in an operating mode in normal light conditions. For example, on sensor controls there are areas in the size 2ù2 the pixel, consisting only from "white" and "dark blue" detectors. In these areas it is impossible to allocate color of the image on an axis "red-green". I.e. losses of fine color details are possible. For example, on sensor controls there are areas in the size 2ù2 the pixel, consisting only from "white" and "dark blue" detectors. And in these areas it is impossible to allocate color of the image on an axis "red-green". [To correct]
References
http://www.dpreview.com/news/0706/07061401kodakhighsens.asp
