Weighted gradient based and color corrected interpolation

Details Weighted gradient based and color corrected interpolation Weighted gradient based and color corrected interpolation

2007-08-14

2007-08-14

Villecco, John M. (Department: 2622)

Television

Camera, system and detail

With single image scanning device supplying plural color...

C348S237000, C348S280000, C382S167000

Reexamination Certificate

active

10347984

ABSTRACT:
The apparatus and method invented are operating upon a digital image signal obtained from an image sensor. The sensor is covered with different colored filters and is only able to record the color transmitted through each specific filter into the photosite or pixel. This type of sensor is known as a color filter array or CFA sensor. The different colored filters are arranged in a predefined pattern across the sensor. To obtain a full color image the missing color information is estimated by a set of weighed values obtained by an inverted gradient function. The set of weighted values is found from the neighboring pixels in the four compass directions, north, east, west and south or is found horizontally and vertically. The surrounding pixels are corrected by the chrominance channel to better fit the center pixel in the luminance channel, prior to using the gradient functions. The chrominance channel is interpolated in a similar manner and is also corrected to better fit the center pixel before the inverted gradient functions are applied.

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