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1. A sub-pixel rendering method for a display panel, comprising: determining a plurality of sampling locations according to a plurality of arrangement locations of a plurality of sub-pixels; converting an input grayscale data of an input image according to a luminance versus grayscale curve and generating an input luminance data, said input luminance data including a plurality of input luminance values; and generating an adjustment luminance data according to a forward function of a human vision model and said input luminance data, said input grayscale data including a plurality of input grayscale values, and said adjustment luminance data including a plurality of adjustment luminance values; sampling said adjustment luminance values from said adjustment luminance data according to said sampling locations; and generating a target grayscale data according to said sampled adjustment luminance values, said target grayscale data including a plurality of target grayscale values, and said target grayscale values corresponding to said sub-pixels.
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