Color filter arrays are widely used in digital cameras. Such arrays allow for every pixel on a sensor array to capture only one of the primary colors red, green and blue. The missing color values need to be interpolated. The arrangement of color filters on the sensor array affects the quality of the reconstructed image. The study of alternative color filter arrays is therefor an important task to improve image quality. In this master thesis four color filter arrays are compared. These are the traditional Bayer-pattern, Fuji's X-Trans-pattern, the pattern that Sony uses in it's F65 camera as well as a pattern for hexagonal grids. For each of them specialized demosaicing algorithms have been implemented to achieve the best possible quality. Several sample images have been processed to show the different properties of the color filter arrays. PSNR and SSIM were measured to determine their quality. Based on these measurements and observations no clear recommendation for a CFA can be made. However, advantages and disadvantages of the CFAs are highlighted and discussed.
This is the abstract of my master thesis. I will add more of it in future posts. If you can´t wait to find out more feel free to contact me.
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