Bayer filter
From Free net encyclopedia
Image:BayerPatternFiltration.png
A Bayer filter mosaic is a color filter array (CFA) for arranging RGB color filters on a square grid of photosensors. The term derives from the name of its inventor, Bryce Bayer of Eastman Kodak, and refers to a particular arrangement of color filters used in most single-chip digital image sensor used in digital cameras, camcorders, and scanners to create a color image.
Bryce Bayer's patent called the green photosensors luminance-sensitive elements and the red and blue ones chrominance-sensitive elements. He used twice as many green elements as red or blue to mimic the human eye's greater resolving power with green light. These elements are referred to as samples and after interpolation become pixels.
The "RAW" output of Bayer-filter cameras is referred to as a Bayer Pattern image. Since each pixel is filtered to record only one of the three colors, two-thirds of the color data is missing from each. To obtain a full-color image, various demosaicing algorithms can be used to interpolate a set of complete red, green, and blue values for each point.
Different algorithms requiring various amounts of computing power result in varying-quality final images. This can be done in-camera, producing a JPEG or TIFF image, or outside of the camera using the RAW data directly from the sensor.
Reference
- Bryce E. Bayer, U. S. patent No. 3,971,065 (20 July 1976).
External links
- Understanding Digital Sensors, Sean McHugh in Cambridge in Colour
- RGB "Bayer" Color and MicroLenses, Silicon Imaging (design, manufacturing and marketing of high-definition digital cameras and image processing solutions)ru:Фильтр Байера