Color balance in digital photography

摘要

A technique for generating a digital photograph comprises blending two related images, each sampled according to a different illumination environment. The two related images are blended according to a blend surface function that includes a height discontinuity separating two different blend weight regions. Color consistency between the two related images is achieved by spatial color correction prior to blending. The technique enables a digital camera to generate a strobe image having an appearance of consistent color despite discordant strobe and ambient scene illumination.

主权项

1. A computer program product embodied on a non-transitory computer readable medium, comprising:
code for generating a color corrected pixel based on a first pixel of a first image, a second pixel of a second image, correction factors, and histogram factors; code for generating a blended pixel based on the first pixel, the color corrected pixel, and a blend surface; and code for storing the blended pixel within a blended image, wherein the computer program product is operable such that the correction factors characterize color divergence between the first image and the second image, and wherein the computer program product is operable such that the histogram factors characterize intensity distribution within the first image and intensity distribution within the second image; wherein the correction factors include frame-level correction factors and patch-level correction factors, and wherein generating the color corrected pixel comprises:
generating adjusted frame-level correction factors based on the frame-level correction factors and the histogram factors;generating sampled patch-level correction factors based on the patch-level correction factors;generating a pixel-level trust factor based on the first pixel and the second pixel;generating pixel-level correction factors based on the adjusted frame-level correction factors, the sampled patch-level correction factors, and the pixel-level trust factor; andcorrecting color associated with the second pixel based on the pixel-level correction factors.