Guotong Feng

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Effective document compression algorithms require scanned document images be first segmented into regions such as text, pictures and background. In this paper, we present a document compression algorithm that is based on the 3-layer (foreground/mask/background) MRC (mixture raster content) model. This compression algorithm first segments a scanned document(More)
Recently, joint analysis and optimization of both the optical subsystem and the algorithmic capabilities of digital processing have created new digital-optical imaging systems with system-level benefits. We explore a special class of digital-optical imaging systems called spherical coding that combine lens systems having controlled amounts of spherical(More)
Conventional halftoning methods such as error diffusion and ordered dithering are poorly suited to the compression of halftone images using the baseline fax compression schemes CCITT G3 and G4. This paper proposes an efficient and flexible solution for binary representation of mixed content documents using CCITT G3/G4 compression. The solution includes two(More)
ii To the memory of my father, ˙ Ihsan Kama¸sak iii ACKNOWLEDGMENTS First of all, I would like to thank my father for inspiring and encouraging me. To be a worthwhile son, I always strive to be one the best in whatever I do in life. I am grateful to my mother and sister for their love and endless support during my graduate studies. I thank for all they have(More)
ii For my parents, Haruko and Hiromasa. iii ACKNOWLEDGMENTS First, I would like to express my greatest appreciation to my major advisor, Professor Charles A. Bouman, who has given me countless precious advice, encouragement, consideration, support, and discipline to train me. His creativity and enthusiasm toward research and education has been a great(More)
Recent research demonstrates the advantage of designing electro-optical imaging systems by jointly optimizing the optical and digital subsystems. The optical systems designed using this joint approach intentionally introduce large and often space-varying optical aberrations that produce blurry optical images. Digital sharpening restores reduced contrast due(More)
It has been shown that electro-optical imaging systems designed by integrating optics and digital processing provide system-level advantages such as extended depth-of-field and lower optical component costs. In such imaging systems, the strength of the optical aberration or blur can dramatically change with the f-number, and hence different digital filters(More)
Recent research in the area of electro-optical system design identified the benefits of spherical aberration for extending the depth-of-field of electro-optical imaging systems. In such imaging systems, spherical aberration is deliberately introduced by the optical system lowering system modulation transfer function (MTF) and then subsequently corrected(More)
This paper reports on novel and traditional pixel and semantic operations using a recently standardized document representation called JPM. The JPM representation uses compressed pixel arrays for all visible elements on a page. Separate data containers called boxes provide the layout and additional semantic information. JPM and related image-based document(More)