Content-adaptive perceptual quantizer for high dynamic range images
US10419762B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Mar 1, 2016 |
| Grant date | Sep 17, 2019 |
| Priority date | — |
| Expiry date | Apr 14, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/154
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A content-adaptive quantizer processor receives an input image with an input bit depth. A noise-mask generation process is applied to the input image to generate a noise mask image which characterizes each pixel in the input image in terms of its perceptual relevance in masking quantization noise. A noise mask histogram is generated based on the input image and the noise mask image. A masking-noise level to bit-depth function is applied to the noise mask histogram to generate minimal bit depth values for each bin in the noise mask histogram. A codeword mapping function is generated based on the input bit depth, a target bit depth, and the minimal bit depth values. The codeword mapping function is applied to the input image to generate an output image in the target bit depth.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.