18900476. IMAGE SPECIFIC GLOBAL TONE CURVE AND RESIDUAL GAIN MAP GENERATION BASED ON MULTIPLE IMAGES (Apple Inc.)
IMAGE SPECIFIC GLOBAL TONE CURVE AND RESIDUAL GAIN MAP GENERATION BASED ON MULTIPLE IMAGES
Organization Name
Inventor(s)
Jackson K. Roland of San Jose CA US
Nicolas P. Bonnier of Mountain View CA US
IMAGE SPECIFIC GLOBAL TONE CURVE AND RESIDUAL GAIN MAP GENERATION BASED ON MULTIPLE IMAGES
This abstract first appeared for US patent application 18900476 titled 'IMAGE SPECIFIC GLOBAL TONE CURVE AND RESIDUAL GAIN MAP GENERATION BASED ON MULTIPLE IMAGES
Original Abstract Submitted
Disclosed are various techniques for generating image specific global tone curves and residual gain maps based on multiple images. A gain map is generated based on a comparison of a first image to a second image. A gain map scatter plot is constructed based on the gain map values and channel values of either the first image or the second image. An image specific global tone curve is determined by curve fitting to the gain map scatter plot. A residual gain map is generated based on a comparison of the gain map to a reconstructed gain map derived from the image specific global tone curve. An approximation of the second image can be constructed using the image specific global tone curve and the first image. A replica of the second image can be constructed using the image specific global tone curve, the residual gain map, and the first image.
