Method and system for fitting image positions

Details Method and system for fitting image positions Method and system for fitting image positions

1989-10-03

1991-07-23

Moore, David K.

Image analysis

Histogram processing

For setting a threshold

378 20, 378 62, 36441316, 36441323, G06K 932

Patent

active

050349880

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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patent: 4802093 (1989-01-01), Ema
patent: 4870692 (1989-09-01), Zuiderveld et al.
patent: 4872188 (1989-10-01), Lauro et al.

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