Method and system for transferring image data between two devices having different bandwidths
US5572335A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 1, 1994 |
| Grant date | Nov 5, 1996 |
| Priority date | — |
| Expiry date | Apr 1, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/3292
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An image input terminal synchronously transfers image data to a host terminal when the internal data transfer rate of the image input terminal exceeds the data transfer rate of the host terminal. The image input terminal scans the document at a constant rate, but the constant rate is slower than the normal scan rate for the image input terminal, thereby effectively scanning the document at a higher resolution. To realize an apparent internal data transfer rate equal to the data transfer rate of the host terminal, the image input terminal periodically discards or skips scanlines of valid image data to give the host terminal ample time to complete the transfer of valid image data. The image input terminal, to facilitate a synchronous transfer of image data, will skip N-1 scanlines of valid image data out of N scanlines of valid image data such that N is determined by the data transfer rate of the host terminal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.