CPC G06T 5/002 (2013.01) [H04N 1/58 (2013.01); H04N 9/646 (2013.01); H04N 9/7908 (2013.01)] | 20 Claims |
1. An operation method of an image signal processor (ISP) configured to perform signal processing on a raw image received from an image device, the operation method comprising:
generating a plurality of multi-scale images based on an input image, the plurality of multi-scale images having resolutions that are different from each other;
iteratively performing a fast global weighted least squares (FGWLS) based operation on each of the plurality of multi-scale images to generate a final illuminance map; and
outputting an enhanced image based on the final illuminance map and the input image.
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