Bitmap block transfer image conversion
US5644758A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 13, 1994 |
| Grant date | Jul 1, 1997 |
| Priority date | — |
| Expiry date | Dec 13, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G5/393
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The speed of bitmap block transfers involving image transformations between source and destination bitmaps is increased by forming a mapping array with entries corresponding one-to-one to elements of destination bitmap scan lines. A preprocessor fills the entries of the mapping array with indices of elements in a source scan line that map according to the image transformation to the elements of a destination scan line that correspond with the array entries. A block transfer compiler can then generate code to perform the transfer which uses the mapping array in an indexed look-up operation to determine the source element to transfer to each element of each scan line of the destination bitmap.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.