Single-step conversion from RGB Bayer pattern to YUV 4:2:0 format
US7002627B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 19, 2002 |
| Grant date | Feb 21, 2006 |
| Priority date | — |
| Expiry date | Feb 18, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2209/046
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Bayer-pattern pixels captured by an image sensor have only one of the three primary colors (RGB) per pixel location. Rather than interpolate the Bayer-pattern to generate the missing RGB color components for each pixel location, a direct conversion is performed to YUV pixels. A luminance calculator receives a 3×3 block of Bayer-pattern pixels and generates a luminance (Y) pixel for the center pixel location. Different coefficients are multiplied by each of the 9 Bayer-pattern pixels before summing to produce the center Y pixel, depending on the pattern location. A chrominance calculator first receives a 3×3 block of Y pixels generated by the luminance calculator. The 9 Y pixels are averaged to produce an average luminance. Two red or blue pixels in the 3×3 block are averaged and the average luminance subtracted. Then a constant is multiplied to generate the U and V pixels. Intermediate interpolated RGB avoided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.