Design of Practical Color Filter Array Interpolation Algorithms

Single-chip digital cameras use a color filter array and subsequent interpolation strategy to produce full-color images. While the design of the interpolation algorithm can be grounded in traditional sampling theory, the fact that the sampled data is distributed among three different color planes adds a level of complexity. Existing interpolation methods are usually derived from general numerical methods that do not make many assumptions about the nature of the data. Significant computational economies, without serious losses in image quality, can be achieved if it is recognized that the data is image data and some appropriate image model is assumed.