ENHANCING DYNAMIC RANGES OF IMAGES
First Claim
Patent Images
1. A method for enhancing dynamic range of a first image, the method comprising:
- identifying one or more enhancement regions within the first image for which luminance values satisfy an enhancement criterion;
applying a smoothly-varying brightness enhancement function to the first image to obtain a second image having a dynamic range greater than that of the first image, the brightness enhancement function increasing luminance values of the second image over the first image in the enhancement regions and in at least some areas adjacent to the enhancement regions, the effect of the brightness enhancement function dropping off smoothly with increasing distance from the enhancement regions.
1 Assignment
0 Petitions
Accused Products
Abstract
Methods and apparatus according to various aspects take as input image data in a lower-dynamic-range (LDR) format and produce as output enhanced image data having a dynamic range greater than that of the input image data (i.e. higher-dynamic range (HDR) image data). In some embodiments, the methods are applied to video data and are performed in real-time (i.e. processing of video frames to enhance the dynamic range of the video frames is completed at least on average at the frame rate of the video signal).
-
Citations
20 Claims
-
1. A method for enhancing dynamic range of a first image, the method comprising:
-
identifying one or more enhancement regions within the first image for which luminance values satisfy an enhancement criterion; applying a smoothly-varying brightness enhancement function to the first image to obtain a second image having a dynamic range greater than that of the first image, the brightness enhancement function increasing luminance values of the second image over the first image in the enhancement regions and in at least some areas adjacent to the enhancement regions, the effect of the brightness enhancement function dropping off smoothly with increasing distance from the enhancement regions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
-
-
19. A method for displaying a first image having a relatively high dynamic range obtained from a second image having relatively low dynamic range, the method comprising:
-
identifying at least one enhancement region within the second image; applying a brightness enhancement function to the second image to generate the first image, wherein compared to the second image, the first image comprises increased luminance values of enhancement-region pixels in the enhancement region and increased luminance values of one or more boundary-region pixels outside of the enhancement region, the luminance value increase of the boundary-region pixels decreasing with distance from the enhancement region; and determining driving signals for at least one modulator of a dual-modulator display based at least in part on intermediate data obtained in the course of application of the brightness enhancement function to the second image. - View Dependent Claims (20)
-
Specification