Image analysis – Image transformation or preprocessing – Selecting a portion of an image
Patent
1997-01-24
1999-07-27
Boudreau, Leo H.
Image analysis
Image transformation or preprocessing
Selecting a portion of an image
382284, 382260, 382263, 382290, 358462, 358463, 358455, G06K 920
Patent
active
059304049
ABSTRACT:
An image processing system and method for laser-printing a composite image containing a monotone image and a multi gradation-level image in a superposed fashion such that the contours of characters in the monotone image are well smoothed without degrading the multi gradation-level image. The multi gradation-level image remains a faithful reproduction of the original and the resultant composite image is improved.
When receiving a composite image 2, an image processing system binarize the pixel values of the composite image 2, to reproduce a mono-tone image 8. At the same time, the system generates a multi gradation-level, N-fold density image 10 from the composite image 2. The mono-tone image 8 is subjected to a smoothing process to smooth the contours of characters. The pixels corresponding to a corrected pixel area 17 in the mono-tone image 8 of the N-fold density image 10 are converted into white pixels by masking the corrected pixel area. Thereafter, the smoothed monotone image 16 and the N-fold density image 18 are superposed one on the other, to thereby form a final image 22.
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Boudreau Leo H.
Patel Kanji
Seiko Epson Corporation
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