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Browse Prior Art Database


IP.com Disclosure Number: IPCOM000026906D
Original Publication Date: 1994-Apr-30
Included in the Prior Art Database: 2004-Apr-07

Publishing Venue

Xerox Disclosure Journal


Proposed is an area mapping procedure for resolution and gray level conversion in which the sizes of input and output pixels are allowed to differ. The approach can simulate gray levels from a black and white input and it can provide a very wide range of conversion ratios. The approach of the resolution conversion is based on a very simple idea of mapping the optical density, which is represented by the pixels of the raw bit map, for a given input area, to the corresponding output area. The size of the output area is identical to the input area. But, the sizes of the input and output pixels are different. The key point in this approach is to maintain the optical density and image structure of the output as close to the input as possible. To achieve this goal, the following procedure is used: