Method and system for fitting image positions
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United States of America Patent
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-
Jul 23, 1991
Grant Date -
N/A
app pub date -
Oct 3, 1989
filing date -
Oct 7, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In each of two images obtained by a digital radiography system, for example, a mask image and a live image, two regions of interest are set by a cutout position setting section. Images within corresponding regions of interest are subjected to subtraction in a subtraction processing section. By calculating the entropy of one of two subtraction images in an entropy calculating section, amounts of shift to make the entropy local minimum is searched for. By using the amounts of shift to make the entropy local minimum, an amount of rotation is searched for, which makes the entropy of the other subtraction image local minimum. The amounts of shift and rotation are set by a parameter setting section in accordance with the calculated entropy.
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