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Image System Quality and Data Compression Enhancement by Excision of Isolated Single Pels and Quad Pel Groups

IP.com Disclosure Number: IPCOM000034384D
Original Publication Date: 1989-Feb-01
Included in the Prior Art Database: 2005-Jan-27

Publishing Venue

IBM

Related People

Authors:
Rohe, CF White, JM [+details]

Abstract

In image data systems, halftone patterns and other high amplitude noise severely impact data compression and reduce image quality. Excision of isolated (unconnected) pels and quads of pels effects significant image quality and data compression enhancement. (Image Omitted) This exposition of the present embodiment assumes that the image has been optically scanned, with each pel digitized and stored in memory. The stored image is examined and upgraded. Fig. 1 shows a single pel "X" surrounded (isolated) by white "W" pels. Fig. 2 shows a quad, or 2 by 2 group of "X" pels (which may include up to 4 black pels) isolated by the 12 "W" pels of an intact 4 by 4 perimeter. In the present embodiment all "X" pel positions meeting these criteria are converted to "W", regardless of their initial status.