Image analysis – Image segmentation – Distinguishing text from other regions
Patent
1996-09-24
1998-09-08
Rogers, Scott
Image analysis
Image segmentation
Distinguishing text from other regions
382237, 382252, 382270, 358456, 358457, 358462, H04N 1405, G06K 938, G06T 500
Patent
active
058057242
ABSTRACT:
A printing system for rendering marks on a recording medium receives a multi-level grey scale pixel value representing a pixel having a first resolution. A screening circuit generates a screened multi-level grey scale pixel value equal to (G.sub.L -V.sub.i)+(S.sub.i -Th)*Dmp.sub.vi *Mod.sub.Eff wherein G.sub.L is the maximum grey level value of the pixel, V.sub.i is equal to the multi-level grey scale pixel value of the first resolution, S.sub.i is equal to a screen value corresponding to a position of the pixel, the image classification of the pixel and a brightness/darkness setting, The threshold value, Dmp.sub.vi is a video dependent dampening factor, and Mod.sub.Eff is a modulation multiplication factor. An interpolator converts the screened multi-level grey scale pixel value to a second resolution, the second resolution being higher than the first resolution, and a binarization circuit binarizes the converted multi-level grey scale pixel value so as to output a binary signal and an error value, the error value having a resolution equal to the first resolution. The error value is diffused to multi-level grey scale pixel values corresponding to pixels adjacent to the pixel having the first resolution, and the binary signal is converted into a mark on the recording medium.
REFERENCES:
patent: 4196453 (1980-04-01), Warren
patent: 4633327 (1986-12-01), Roetling
patent: 4866534 (1989-09-01), Tada
patent: 5243443 (1993-09-01), Eschbach
patent: 5424854 (1995-06-01), Hashimoto
patent: 5471543 (1995-11-01), Ng et al.
Feng Xiao-fan
Metcalfe David J.
Newell John T.
Triplett Roger L.
Nickerson Michael J.
Rogers Scott
Xerox Corporation
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