John C Dalton

Title: Innovations of John C Dalton

Introduction

John C Dalton is a notable inventor based in San Francisco, CA. He has made significant contributions to the field of image processing and has been awarded four patents for his innovative work. His inventions focus on improving the quality of image representation and processing.

Latest Patents

Dalton's latest patents include a system and method for adapting the thresholds of a dither matrix. This system generates a binary representation signal suitable for outputting on an output device from a continuous toned image signal. It ensures local correspondence between the average value of the input signal and the output representation signal for local spatial areas. The system comprises a processor, an input device, an image adaptor, a summer, a dither signal generator, and a pixel activator. The image adaptor receives a reference image signal, determines the number of pixels in local areas to be activated, and generates an adaptive signal. The summer combines a dither signal from the dither signal generator and a continuous toned image signal to create a ditherized signal. The pixel activator generates a signal to activate the pixels in each local area based on the highest sum according to the adaptive signal.

Another patent focuses on generating images with improved visual quality. This system produces a set of dither matrix signals having local correlation. It includes a processor, an input device, a display device, a hard output device, an incremental threshold generator, a pattern generator, an optimizer, a dither matrix storage, and a pixel activator. The incremental threshold generator determines a maximum tolerable error and generates an incremental threshold signal. The pattern generator uses this signal to create possible pattern signals based on previous gray levels. The optimizer selects the pattern signal that introduces the least error into the output image and stores it in the dither matrix storage.

Career Highlights

John C Dalton is currently employed at Apple Inc., where he continues to innovate and develop new technologies. His work has significantly impacted the field of image processing, enhancing the visual quality of images produced by various devices.

Collaborations

Dalton has collaborated with Gary K Starkweather, a fellow innovator in the field. Their combined expertise has led to advancements in image processing technologies.

Conclusion

John C Dalton's contributions to image processing through his patents and work at Apple Inc. highlight his role as a significant inventor in the technology sector. His innovative systems and