Compressed MIP map decoding method and decoder with bilinear filtering
US10674162B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 24, 2019 |
| Grant date | Jun 2, 2020 |
| Priority date | — |
| Expiry date | May 24, 2039 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/82
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Methods and apparatus for compressing image data are described along with corresponding methods and apparatus for decompressing the compressed image data. A decoder unit identifies neighbouring pixels based on coordinates of a sample position and fetches encoded data from the compressed image data for each of the neighbouring pixels. A first decoder decodes fetched encoded blocks of a first image and a difference decoder decodes fetched encoded sub-blocks of differences between the first image and a second image and outputs a difference quad and a prediction value for each of the four pixels, and a reconstruction of the image is generated at the sample position using the decoded blocks of the first image, difference quads and prediction values. A bilinear filtering unit performs bilinear filtering on a linearly interpolated output of a pre-filter using a second part of the coordinates of the sample position to generate the reconstruction of the image at the sample position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.