Lossy compression of high dynamic range video
US8666186B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 21, 2012 |
| Grant date | Mar 4, 2014 |
| Priority date | — |
| Expiry date | Dec 21, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V10/40
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A high dynamic range (HDR) video can be compressed using inter-frame or intra-frame compression. The compression results in multiple encoded macroblocks and associated residual images. The residual images can be lossy compressed by mapping floating point image data values of the residual image from a light linear space to a perceptually linear space using a first non-linear mapping function. A value in the light linear space is proportionate to the power of a light source, and a value in the perceptually linear space is proportionate to a visual perceived brightness. Floating point discrete cosine transform (DCT) frequency coefficients of the floating point image data values of the residual image are determined. The floating point DCT frequency coefficients are quantized. The quantized floating point DCT frequency coefficients are compressed. The compression of the quantized floating point DCT frequency coefficients is lossless. The compressed quantized floating point DCT frequency coefficients are stored.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.