Method of processing image data for transmission, and use of this process
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United States of America Patent
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Feb 9, 1999
Grant Date -
N/A
app pub date -
Aug 9, 1993
filing date -
Apr 30, 1990
priority date (Note) -
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Abstract
Image data representing successive original images is prepared for transmission by comparing the characteristics of an 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 portions with respect to the characteristic, each differences indication is compared with a threshold value representing a selected difference indication, and, based on each difference indication which exceeds the threshold value, an operation is performed, which involves preparing transformation-coded data or determining a motion vector. The Threshold value from one original image to the next is changed 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 is selected so that for each original image of the second group, the performance of an operation based on each difference indication will be carried our for only a small number of image regions in which major changes occur relative to the preceding original image.
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