Method for Processing Highlights and Saturated Regions in a Digital Image

摘要

A method for performing highlight restoration on a digital image includes comparing the pixels in the image with a saturation level value to identify saturated pixels. A saturation map of saturated pixels is generated. Each selected saturated pixel is identified as a restorable pixel only if at least one color channel of the pixel is unsaturated. For each restorable pixel, a group of the closest unsaturated pixels above, below, to the left, and to the right of the select saturated pixel is identified. A replacement pixel value is generated for each saturated color channel of the restorable pixel, using a combination of the pixel values of the unsaturated color channels of the restorable pixel and the pixel values of the corresponding color channels of the nearby unsaturated pixels.

主权项

1. A method for restoring pixels in a digital image having saturated values in a color channel, comprising:
creating a saturation map of the image by comparing the pixel values with a predetermined threshold; analyzing the image to select pixels having unsaturated values in the color channel; creating at least one table of correction factors; for each pixel in the image, calculating the index to the correction table, and applying the correction factor to the saturated value of the color channel to obtain a corrected value; and replacing the saturated value in the color channel with the corrected value.