Allan Chiwan Cheung

Title: Innovator Allan Chiwan Cheung: Driving Advancements in Digital Halftoning

Introduction

Allan Chiwan Cheung, a prominent inventor based in Lexington, KY, has made significant contributions to the field of digital halftoning. With an impressive portfolio of four patents, he has focused on refining halftoning algorithms that enhance the visual quality of output devices, such as color displays and printers.

Latest Patents

Cheung's latest patents involve advanced halftoning techniques. His first innovation, titled "Combined Color Halftoning," explores halftoning algorithms like error diffusion and blue noise mask. These algorithms produce visually appealing, random, and uniformly distributed patterns of dots across various output devices. Cheung's extension of these algorithms allows for a substantial homogenous distribution of dots when utilizing multiple colorants by combining the number of dots from each colorant to create a cohesive output.

Another notable patent is the "Digital Halftoning with Error Diffusion." This technique leverages a modified Floyd and Steinberg type filter that calculates two error terms — one divisible by two and another by four. By employing this method, Cheung enhances the accuracy and quality of digital halftoning, making significant improvements to scanning direction and resulting output.

Career Highlights

Allan Chiwan Cheung is currently associated with Lexmark International, Inc., where he continues to innovate and drive advancements in his field. His work has not only focused on the technical specifications of halftoning but also emphasizes the practical implications of these patents in enhancing digital output quality.

Collaborations

Throughout his career at Lexmark International, Cheung has collaborated with talented colleagues, including Scott Michael Heydinger and Shaun Timothy Love. These collaborations have likely enriched his research and led to advancements that benefit the company and the broader technology sector.

Conclusion

Allan Chiwan Cheung stands out as an influential figure in the realm of digital imaging and halftoning. His innovative patents demonstrate his commitment to enhancing the quality of digital output through meticulous research and development. As technology continues to evolve, Cheung's contributions are expected to play a pivotal role in shaping the future of digital printing and display technology.