Transfer function and high dynamic range images
US7626614B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 15, 2005 |
| Grant date | Dec 1, 2009 |
| Priority date | — |
| Expiry date | Sep 1, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/741
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Methods and apparatuses to derive at least one exposure function for high dynamic range imaging from images of different exposure durations. In one aspect, a method to generate a high dynamic range image from a plurality of images taken with a plurality of exposure durations respectively, includes: computing an exposure function from the plurality of images; and combining the plurality of images into a high dynamic range (HDR) image using the exposure function. In one example of an embodiment, the exposure function is evaluated through: evaluating first data representing a derivative of the exposure function from pixel values of the plurality of images; and integrating the first data to generate second data representing the exposure function.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.