Method and apparatus for coding an image object of arbitrary shape
US6718066B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 14, 2000 |
| Grant date | Apr 6, 2004 |
| Priority date | — |
| Expiry date | Jan 15, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/61
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
It is known to represent a square block of an image which has a maximum horizontal or vertical extension N as N vectors each representing one column or row, and encode it using an N×N discrete cosine transform matrix. We introduce a technique which transforms an input vector, or array, representing a portion of an arbitrarily-shaped object block in which the maximum horizontal or vertical extension is at most N, by adding to it additional padding elements, to produce a vector or array which can be encoded using an N×N discrete cosine transform. The padding maximises the number of transformed elements which are zero. We propose encoding arbitrarily-shaped objects based on this padding technique.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.