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IBM Journal of Research and Development  
Volume 31, Number 1, Page 32 (1987)
Office Automation Technologies
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PANDA: Processing Algorithm for Noncoded Document Acquisition

by Y.-H. Chen, F. C. Mintzer, K. S. Pennington
With a scanned-document-handling system, documents can be scanned, stored, transmitted to remote locations, viewed on displays and terminals, edited, and printed. These systems hold much promise for office automation, since they facilitate the communication and storage of information that is not easily recoded into the traditional formats for text and graphics. However, most of the current systems that perform these functions are intended for documents that at every point are either black or white, but not gray. These systems effectively exclude documents that contain regions with varying shades of gray (known as continuous-tone regions). PANDA, the Processing Algorithm for Noncoded Document Acquisition, is a technique that processes mixed documents, those that contain continuous-tone regions in addition to text, graphics, and line art. PANDA produces a high-quality binary representation of all regions of a mixed document. Furthermore, all regions of the binary representation, including the continuous-tone image regions, are significantly compressed by the run-length-based compression algorithms that underlie scanned-document-handling systems. This is a key feature of PANDA. Indeed, this compression makes practical the inclusion of mixed documents into many existing systems.
Related Subjects: Algorithms; Graphics; Image processing