Endometrium estimation in a sequence of ultrasonic images

In this paper a novel algorithm for motion estimation of the endometrium in a sequence of ultrasonic images is presented. The algorithm used is based on the criterion that a pixel of a motion object at different times has a d ifferent gray value. The motion estimation includes motion frequency and th ickness; the former one is determined by the detection of change of a pixel value in a sequence of images during a given time period, and the latter i s the result of the object's dimension divided by its extended width. The a lgorithm has been tested on synthetic and real images, and the results are encouraging. (C) 2001 Elsevier Science Ltd. All rights reserved.