Subtractive color processing system for digital imaging
US6366319B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 3, 1997 |
| Grant date | Apr 2, 2002 |
| Priority date | — |
| Expiry date | Jul 3, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N25/134
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Improved methods and apparatus for digital focal plane array (FPA)—based color imaging include the step of sampling an image, using an FPA camera equipped with a color filter array (CFA) to obtain a value at each pixel position, thereby creating a set of values sampled on a per-pixel basis. Single-color cyan, yellow and white (CYW) color planes are generated from the set of sampled pixel values. Interpolates among and between the color plane values is executed to “fill in” the “gaps” in the individual color planes, and the interpolated CYW values from the single-color planes are transformed into RGB values which can be stored, transmitted, or utilized to drive a conventional video monitor or color printing device. Filtering and other post-interpolation steps are executed to reduce color aliasing, and the white plane is used to introduce high frequency content back into the filtered color image. In one practice of the invention, the CYW values are transformed into CIELAB color space values. The interpolated W plane is used to calculate L* values, and C, Y, and W planes are used to calculate a* and b* values. The a* and b* planes are filtered using a win…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.