IBM Journal of Research and Development
IBM Skip to main content
  Home     Products & services     Support & downloads     My account  

  Select a country  
Journals Home  
  Systems Journal  
Journal of Research
and Development
    Current Issue  
    Recent Issues  
    Papers in Progress  
    Recent publications  
    Author's Guide  
  Contact Us  
  Related links:  
     IBM Research  

IBM Journal of Research and Development  
Volume 31, Number 1, Page 32 (1987)
Office Automation Technologies
  Full article: arrowPDF   arrowCopyright info


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