Image analysis – Image enhancement or restoration – Image filter
Patent
1994-07-01
1996-10-22
Mancuso, Joseph
Image analysis
Image enhancement or restoration
Image filter
382274, 358448, G06K 940
Patent
active
055685722
ABSTRACT:
Disclosed are printing methods and apparatus that process image source data into printed output visually superior to that obtained by conventional predistortion. In accordance with a first aspect of the invention, multibit source data representing the density variations of an original or source image is modified by a filter function. The filtered data is then processed by a halftoning routine that converts the data into a raster of single-bit data suitable for transfer to a printing device. The raster data specifies a density pattern lighter than that of the source image in highlight and upper midtone regions and darker than that of the source image in shadow and lower midtone regions. In accordance with a second aspect of the invention, an analogous filter is applied to parameters associated with the halftone processing algorithm rather than to the source data.
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Janofsky Eric B.
Mancuso Joseph
Patel Jayanti K.
Seiko Epson Corporation
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