Abstract
This paper presents an effective local dimming algorithm that
preserves the perceived image quality consistently in the backlight
dimmed images regardless of viewing distances. The proposed algorithm
determines the clipped points of each LED block by limiting the maximum
size of image area to be distorted, and guarantying the minimum image
quality in terms of the peak signal-to-noise ratio. It also preserves
the perceived image quality of the dimmed images by adjusting the
size of area to be distorted depending on the viewing distances of
users. Simulation results show that the proposed method improves the
average PSNR and the average SSIM values of the dimmed images by 4.19–13.21
dB and 0.002–0.004, compared with the benchmark methods, for
viewing distances of 2.5–6.5 m, respectively. The proposed method
also maintains the image quality of the dimmed images regardless of
the image's characteristics, compared with the benchmark methods.
In addition, it is confirmed that the proposed method achieves the
higher power savings as the viewing distance increases. At the viewing
distance of 6.5 m, although the image quality of the dimmed images
are higher than that of the benchmark methods, the proposed method
consumes 0.56% less power.
© 2014 IEEE
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