Appeal No. 94-2081
Application No. 07/809,984
spatial resolution, Figure 4 of Le Gall does, however, show a
reduction in spatial resolution when the originating raster
characteristics 100 are compared to the receiving raster
characteristics 200. Other than the brief mention that the
number of bits per pixel can be changed, Le Gall does not
state how the change in bits per pixel is accomplished in
conversion unit 10. More importantly, Le Gall does not
describe the order in which the changes in spatial resolution
and data resolution are performed in the conversion unit. The
claims on appeal specifically state that changes in the data
resolution are performed on the downsampled or spatially
reduced image by (1) thresholding the downsampled image to
produce a specific number of bits with respect to the
originally digitized image or (2) quantizing in accordance
with plural quantizing thresholds.
Hirabayashi discloses binarization of an image after
subsampling (Figures 4, 10 and 14). The reduced pixel values
from the subsampling unit are input to the binarization unit
and are compared with the threshold value T=0.5 (column 7,
lines 18 through 23 and column 8, lines 58 through 60). The
comparison of the pixel values with the single threshold value
8
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