Efficient processing of images in printers
US7170628B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 20, 2002 |
| Grant date | Jan 30, 2007 |
| Priority date | — |
| Expiry date | Aug 5, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L69/22
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A printer controller in which the image data received in indexed format is stored only in indexed format. The image data is converted to long format when required for rendering operations by using an appropriate lookup table. By storing the image data only in indexed format until the time of rendering, the memory requirements within a system may be minimized. According to another aspect of the present invention, floating point operations (providing higher precision) may be used in a interpreter block and fixed point operations (providing more speed) may be used in a rendering block, while avoiding/reducing image artifacts in upscaled images. A check is performed to determine whether a pixel in the upscaled image maps back to fall within the boundary of the source image, and corrective action is taken if the pixel does not fall within the boundary.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.