Method for estimating white point shift for auto white balance

Details Method for estimating white point shift for auto white balance Method for estimating white point shift for auto white balance

2007-02-13

2007-02-13

Do, Anh Hong (Department: 2624)

Image analysis

Color image processing

Color correction

C382S162000, C382S289000, C382S293000, C382S296000

Reexamination Certificate

active

10248373

ABSTRACT:
A method of estimating shift of white balance point. According to characteristics of a photograph sensing apparatus, a white-point plane of a YIQ color coordinate is determined. The white-point plane has a normal direction pointing one of the axis of the YIQ color coordinate. The white-point plane is thus perpendicular to such axis with a one-dimensional one-spot value. Consequently, a YIQ image data described by the YIQ color coordinate is obtained. The same rotation operation is performed to rotate the YIQ image data to obtain a one-dimensional image value. The one-dimensional image value is compared to the one-dimensional white-point value to obtain a differential value, so as to estimate the white-point shift. In the above method, the axis of the YIQ color coordinate includes the Y-axis after rotation.

REFERENCES:
patent: 4623973 (1986-11-01), Hoffrichter et al.
patent: 6674561 (2004-01-01), Ohnishi et al.
patent: 6868179 (2005-03-01), Gruzdev et al.
patent: 7009733 (2006-03-01), Gruzdev et al.

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