Filter-matrix cameras collect three channels of color information in a single integration. This technology depends on a sensor that has integral red, green, and blue color filters (or sometimes cyan, magenta, yellow, and green color filters) organized in a 2 x 2 unit cell. Instead of capturing the color channels in sequence, the channels are captured simultaneously—at considerable cost to the versatility, sensitivity, and resolution of the sensor—but with greater convenience and ease of use.
If a filter-matrix sensor is read out directly, as a monochrome array, the resulting "raw" image looks like a checkerboard, with different squares showing different color channels. To recover the embedded color image, it is necessary to interpolate a representative (R, G, B) value for each pixel from surrounding pixels. Since the interpolation is equivalent to a low-pass spatial filter, the resolution of
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