DemosaicingVerarbeitung

Demosaicing, also known as debayering, is a process in digital image processing used to reconstruct a full-color image from the output of a color filter array (CFA). Many digital cameras, particularly DSLRs and smartphones, use a CFA such as the Bayer filter. This filter consists of a mosaic of red, green, and blue filters placed over the image sensor, where each photosite records only one color. The demosaicing algorithm interpolates the missing color information for each photosite to create a full RGB image.

The Bayer filter pattern typically places green filters in a checkerboard arrangement, with red and blue filters alternating in the remaining positions. This is because the human eye is more sensitive to green light. A common demosaicing algorithm is the bilinear interpolation method, which averages the values of neighboring pixels to estimate the missing colors. More advanced algorithms like bicubic interpolation or edge-directed methods aim to preserve image details and reduce artifacts such as color aliasing or jagged edges. The choice of demosaicing algorithm can significantly impact the perceived quality of the final image, affecting sharpness, color accuracy, and the presence of visual noise.