Appeal No. 95-4373
Application 07/917,108
original image are broken down into image zones, and transfor-
mation-coded data are prepared and/or a motion vector is
determined per image zone as a function of a change criterion,
for example a threshold value that serves to distinguish between
changed and unchanged image zones.
Independent claim 10 is reproduced as follows:
10. In a process for preparing image data in the form
of image data signals for transmission, wherein the
image represents successive original images, each
original image is divided into a plurality of image
regions, each image region is associated with a
respective portion of the image data and each image
data portion has a characteristic, the process
including comparing the characteristic of the image
data portion associated with each image region of each
original image with the characteristic of the image
data portion of the same image region of the
immediately preceding original image to produce an
indication of any difference between the image data
portions with respect to the characteristic, comparing
each difference indication with a threshold value
representing a selected difference indication, and,
based on each difference indication which exceeds the
threshold value, performing at least one operation
selected from the group consisting of preparing
transformation-coded data and determining a motion
vector, the improvement comprising changing the
threshold value from one original image to the next so
that the threshold value has a low value for a first
group of original images and a high value for a second
group of original images, where the original images of
the first group alternate with the original images of
the second group, the high value being selected so
that for each original image of the second group, said
performing step based on each difference indication
will be carried out for only a small number of image
regions in which major changes occur relative to the
preceding original image.
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Last modified: November 3, 2007