William M Doumas

Title: William M. Doumas: Innovations in Printing and Raster Imaging

Introduction

William M. Doumas is an inventor associated with Boulder, Colorado, and International Business Machines Corporation (IBM). His two patents address image quality and toner control in printing technologies.

Latest Patents

Doumas’s patent, “Printing Machine with Toner Density Balance in Solid Areas and Line,” describes a printing machine that adjusts image intensity on a picture-element basis. It distinguishes the interior of solid areas from edges, text, and lines, helping balance toner density across these different image features. The patent also describes methods for setting line width, toner density, and exposure levels.

His patent, “Anti-Aliasing of Raster Images Using Assumed Boundary Lines,” presents a method for improving raster-image quality. It compares patterns of filled and unfilled picture elements with predetermined patterns to infer a line’s position and angle. The system then adjusts the intensity of a central picture element according to how the inferred line bisects it.

Career Highlights

Doumas’s listed inventions focus on practical challenges in electrophotographic printing and raster imaging. Together, they describe techniques for controlling toner deposition and refining the appearance of lines and image boundaries.

Collaborations

The provided information lists Ralph S. Colby and Jean-Claude Fouere as Doumas’s coworkers. It does not specify their roles in the patents.

Conclusion

William M. Doumas’s two patents reflect work on improving print consistency and raster-image quality through precise control of toner density and picture-element intensity.