Issued Patents All Time
Showing 26–47 of 47 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6144775 | Method and system for storing error values for an image conversion process utilizing dynamic error diffusion | Leon C. Williams, David J. Metcalfe | 2000-11-07 |
| 6137907 | Method and apparatus for pixel-level override of halftone detection within classification blocks to reduce rectangular artifacts | Raymond J. Clark | 2000-10-24 |
| 5960109 | Single pass marker enclosed area detection system and method for a photocopier | — | 1999-09-28 |
| 5933539 | Method and system for hybrid error diffusion processing of image information using programmable screen modulation | David J. Metcalfe | 1999-08-03 |
| 5903361 | Method and system for processing image information using background error diffusion | David J. Metcalfe | 1999-05-11 |
| 5880857 | Error diffusion pattern shifting reduction through programmable threshold perturbation | Leon C. Williams, David J. Metcalfe | 1999-03-09 |
| 5852678 | Detection and rendering of text in tinted areas | Zhigang Fan, Raymond J. Clark | 1998-12-22 |
| 5850474 | Apparatus and method for segmenting and classifying image data | Zhigang Fan, Kathy Ryall, Shriram V. Revankar | 1998-12-15 |
| 5809177 | Hybrid error diffusion pattern shifting reduction using programmable threshold perturbation | David J. Metcalfe, Leon C. Williams | 1998-09-15 |
| 5787206 | Method and system for processing image information using expanded dynamic screening and error diffusion | Leon C. Williams, David J. Metcalfe | 1998-07-28 |
| 5765029 | Method and system for fuzzy image classification | Stuart A. Schweid, Raymond J. Clark | 1998-06-09 |
| 5710836 | System and apparatus for tonal reproduction adjustment in an error diffusion process | Francis K. Tse | 1998-01-20 |
| 5696601 | System and method for redistributing error values from an error diffusion process | David J. Metcalfe, Leon C. Williams | 1997-12-09 |
| 5642202 | Scan image target locator system for calibrating a printing system | Leon C. Williams | 1997-06-24 |
| 5608821 | Method of high addressability error diffusion | David J. Metcalfe, Leon C. Williams | 1997-03-04 |
| 5553171 | Apparatus and method for arbitrary binary resolution conversion | Ying-wei Lin | 1996-09-03 |
| 5528384 | System and method for implementing fast high addressability error diffusion process | David J. Metcalfe, Leon C. Williams | 1996-06-18 |
| 5515172 | Apparatus and method for enhanced color to color conversion | — | 1996-05-07 |
| 5353127 | Method for quantization gray level pixel data with extended distribution set | Zhigang Fan | 1994-10-04 |
| 5341226 | Automatic image segmentation for color documents | — | 1994-08-23 |
| 5293430 | Automatic image segmentation using local area maximum and minimum image signals | Barbara L. Farrell | 1994-03-08 |
| 5196942 | System and method for determining picture element values | — | 1993-03-23 |