Method for sending bit mapped image by appending special code to text string and transmitting the text string separately from compressed residual image
US5640607A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 21, 1992 |
| Grant date | Jun 17, 1997 |
| Priority date | — |
| Expiry date | Apr 21, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V10/751
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of transferring the digital representation of a bit-mapped image which includes the steps of: (1) identifying predefined patterns in the bit-mapped image data, and (2) transmitting pattern codes corresponding to those patterns to a receiving device. The identification of the patterns involves the partitioning of the bit-mapped image into a series of pattern cells and the scanning of those pattern cells to find preselected patterns. The preferred method of searching the pattern cells is based upon the use of a hashing function and hash tables. In response to the received pattern codes, the receiving device reconstructs the bit-mapped image associated with the pattern codes. After all patterns in the bit-mapped images are identified and sent to the receiving device, the non-recognized portions of the bit-mapped image are then sent. The overall bit-mapped image is recreated by combining the recognized patterns with the non-recognized portions in their original order.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.