Method and apparatus for improved video decompression by selective reduction of spatial resolution
US5864637A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 18, 1995 |
| Grant date | Jan 26, 1999 |
| Priority date | — |
| Expiry date | Apr 18, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/59
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A video system examines the transform domain content of various spatially related blocks in a compressed video bitstream to determine whether predetermined types of similarities exist between multiple blocks. When certain selected similarities are found, the video system spatially combines the blocks in a predetermined manner. In some embodiments, DCT coefficients of a plurality of blocks are averaged to form one averaged block and the averaged block is inverse discrete cosine transformed. The averaged and IDCT transformed block is written to the display at the position of each of the averaged blocks. In some embodiments, a representative block of a plurality of DCT coefficient blocks is selected and inverse discrete cosine transformed. The selected and IDCT transformed block is written to the display at the position of each of the plurality of blocks.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.