X-ray or gamma ray systems or devices – Specific application – Absorption
Patent
1999-02-12
2000-11-28
Bruce, David V.
X-ray or gamma ray systems or devices
Specific application
Absorption
378 98, G01N 2304
Patent
active
061545198
ABSTRACT:
The invention relates to an image processing method for estimation of motion in a sequence of temporal images on the basis of a block matching algorithm, which method includes the steps of: acquiring a sequence of three successive temporal images, including an image to be processed (J.sub.t) between a preceding, so-called causal image (J.sub.t-1) and a later, so-called anti-causal image (J.sub.t+1), determining a reference block (RB.sub.t) in the image to be processed, and of a pair of blocks (CB.sub.t-1, CB.sub.t+1) which are located in the causal image and the anti-causal image, respectively, and best match the reference block (RB.sub.t) in conformity with an intensity similarity criterion, and determining a motion vector relating to the reference block on the basis of the location of the blocks of the pair with respect to the location of the reference block. The invention also relates to an image processing method for reducing the noise in a sequence of images, including steps for evaluating motion vectors between the images of the sequence and steps for the recursive temporal filtering of the noise with motion compensation by means of the vectors, and to an X-ray apparatus which includes a system for the acquisition of a sequence of images and an image processing system which has access to the data of the images and to a system for displaying the images of the sequence, and includes a processor for carrying out an image processing method.
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"Robust Block-Matching Motion-Estimation Technique for Noisy Sources" by Robert M. Armitano et al. In "1997 IEEE, International Conference on Acoustics, Speech and Signal Processing", vol. IV< pp. 2685-2688.
Florent Raoul
Gatepin Philippe
Bruce David V.
Renfrew Dwight H.
U.S. Philips Corporation
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