Overlapped curve mapping for histogram-based local tone and local contrast
US11354788B1 · kind B1 · utility
1Cited by
0References
18Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 7, 2020 |
| Grant date | Jun 7, 2022 |
| Priority date | — |
| Expiry date | Dec 7, 2040 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2360/16
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Methods and apparatuses are disclosed herein for performing tone mapping and/or contrast enhancement. In some examples, a block mapping curve is low-pass filtered with block mapping curves of surrounding blocks to form a smoothed block mapping curve. In some examples, overlapped curve mapping of block mapping curves, including smoothed block mapping curves, is performed, including weighting, based on a pixel location, block mapping curves of a group of blocks to generate an interpolated block mapping curve and applying the interpolated block mapping curve to a pixel to perform ton mapping and/or contrast enhancement.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.