System and method for a high performance color filter mosaic array
A method of implementing high-performance color filter mosaic arrays (CFA) using luminance pixels. The introduction of luminance pixels greatly improves the accuracy of the image acquisition process for a given pixel and image sensor size.
1. A pixel comprising:
a single pixel luminance filter positioned over the pixel, the single pixel luminance filter comprising a plurality of colors, wherein the size of each of the colors of the single pixel luminance filter is proportional to a share of the associated color of the single pixel luminance filter that is used to calculate a luminance value for the pixel, wherein the luminance value for the pixel is determined using only filtered electromagnetic radiation received by a single image sensor through the single pixel luminance filter, and wherein the plurality of colors include red, green and blue, and wherein the green filter comprises 70% of the single pixel luminance filter, the red filter comprises 20% of the single pixel luminance filter and the blue filter comprises 10% of the single pixel luminance filter.
2. The pixel of claim 1 wherein the single image sensor is coupled to receive a luminance filtered electromagnetic radiation signal from the single pixel luminance filter, and to provide an output indicative of a luminance of an input electromagnetic radiation signal.
3. A color filter array comprising:
a luminance pixel, the luminance pixel comprising a single pixel luminance filter including a plurality of colors, wherein the size of each of the colors of the single pixel luminance filter is proportional to a share of the color used when calculating a luminance value of the luminance pixel, wherein the luminance value is determined using only filtered electromagnetic radiation received by a single image sensor through the single pixel luminance filter, and wherein the plurality of colors include red, green and blue, and wherein the green filter comprises 70% of the single pixel luminance filter, the red filter comprises 20% of the single pixel luminance filter and the blue filter comprises 10% of the single pixel luminance filter.
4. The color filter array of claim 3 wherein the single image sensor is coupled to receive a luminance filtered electromagnetic radiation signal from the single pixel luminance filter, and to provide an output indicative of a luminance of an input electromagnetic radiation signal.
5. The color filter array of claim 3 , further comprising:
a plurality of luminance pixels; and
a plurality of chroma pixels, wherein each chroma pixel is adjacent to at least two luminance pixels.
6. The color filter array of claim 5 , wherein each chroma pixel is adjacent to at least four luminance pixels.
7. The color filter array of claim 6 , wherein the luminance pixels surround each of the plurality of chroma pixels.
8. The color filter array of claim 7 wherein each luminance pixel is bordered by at least one chroma pixel in the color filter array.
9. The color filter array of claim 3 wherein a shape of the single pixel luminance filter is matched to a shape of an image sensor.
10. The color filter array of claim 9 wherein each luminance pixel is bordered by four chroma pixels in the color filter array.
11. The color filter array of claim 3 wherein the luminance pixel provides only luminance information for the luminance pixel.
12. The color filter array of claim 10 wherein the chroma pixels include red pixels and blue pixels, and wherein the red pixels and blue pixels are disposed in different rows.
13. The color filter array of claim 3 wherein the luminance pixel is one of a plurality of pixels in the color filter array, and wherein the other plurality of pixels comprise chroma pixels.