Image processor and computer program product

Details Image processor and computer program product Image processor and computer program product

2011-06-07

2011-06-07

Mehta, Bhavesh M (Department: 2624)

Image analysis

Color image processing

Color correction

C382S162000, C358S524000, C348S441000

Reexamination Certificate

active

07957588

ABSTRACT:
To acquire the signal values of all the color components (RGB) at the positions of all the pixels constituting an image, the processing for interpolating the signal value of a lacking color component is performed by converting the gradation space from a linear gradation space into a square root gradation space with offset as follows. An offset ε in proportion to the ISO sensitivity preset for an imaging device is added to a linear gradation signal x. The value (x+ε) after the offset is converted into a gamma space of one-half power. Therefore, the errors contained in the signal values after the gamma conversion are equalized over the whole gradation by the error propagation rule. The slope of the curve23indicating the square-root gradation space with offset is not steeper in a region (e.g. 0<x<0.1) where the linear input is smaller than that of the curve22indicating the mere square-root gradation space.

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Supplementary Partial European Search Report issued in European Patent Application No. 05 75 3013 on Dec. 1, 2009.

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