An Adaptive Adjustment Algorithm for Planck's Curve

Abstract

The invention discloses an adaptive adjustment algorithm of a Planck curve. The algorithm is realized in steps as follows: drawing an original Planck curve table PLK[N]; establishing a Planck curve remapping table PLK Mapping[N / L] with a distance L as an interpolation with a linear interpolation method; setting each parameter in the PLK Mapping[N / L] one by one according to the deviation condition of color statistical information corresponding to an actual scene from high and low color temperature parts of the original Planck curve in a Cr-Cb coordinate system; selecting a reference curve in an X-Y coordinate system, remapping the Planck curve, obtaining points closest to the reference curve from rg and bg in PLKN[N], setting all high and low color temperature overlapping parts at two ends of the PLKN[N] as Cr=Cb. Thus, related calculation for automatic white balance is performed by the aid of the remapped PLKN[N], and adaptive adjustment of the high and low color temperature parts is realized.

Description

technical field [0001] The invention relates to an automatic white balance algorithm of a digital image, more specifically, an adaptive adjustment algorithm of a Planck curve. Background technique [0002] Under different lighting conditions, when we directly observe the world with the naked eye, the perception of the same color remains basically constant. For example, when we look at a white object in the morning when the sun rises, we feel that it is white. and at night, when we look at a white object under dim light, we feel that it is still white. Another example is that we stay under the tungsten lamp for a long time, the white under the tungsten lamp is still white, and the white paper does not feel reddish. This is due to the continuous growth of human beings, and the human brain has adapted to the color of objects under different light. It is precisely because of this unique adaptability that the human brain can detect and correct color changes under different ligh...

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to provide an adaptive adjustment algorithm of the Planck curve, which solves the problem that the existing automatic white balance algorithm based on the Planck curve is prone to color distortion such as bluish and reddish under high color temperature and low color temperature. question

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