Abstract
This paper proposes a retinex theory-based approach to
RGB-to-RGBW conversion that preserves the human color perception within a
pre-determined level of color distortion for RGBW displays. The proposed method
primarily consists of two procedures. In the first, it searches for the maximum
intensity level that induces no color distortion for a given image by extracting
the white spectra from the common components of the RGB primary colors and
adjusting all the pixels' gains uniformly. In the second, the proposed method
applies an additional gain to each pixel based on its chromaticness and controls
the color distortions arising from the individual gains using the color perception
estimated by retinex theory and a feedback mechanism. Experimental results
showed that the proposed method was more effective than conventional methods
in terms of intensity increment and color preservation. For Kodak test images,
the proposed method increased the average intensity by 1.4987 times with a
color-distortion level of 0.0094 compared to reference RGB displays, whereas
the conventional methods increased the average intensity by 0.8624–1.3429
times with color-distortion levels of 0.0325–0.0682. The surplus intensity
yielded by the proposed method can be used to dynamically reduce the power
consumption of a liquid crystal display (LCD) backlight or to provide brighter
images on LCDs.
© 2012 IEEE
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