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http://dx.doi.org/10.6109/jkiice.2007.11.7.1341

Optical flow of heart images by image-flow conservation equation and functional expansion  

Kim, Jin-Woo (경성대학교 멀티미디어통신공학과)
Publication Information
Journal of the Korea Institute of Information and Communication Engineering / v.11, no.7, 2007 , pp. 1341-1347 More about this Journal
Abstract
The displacement field (Optical flow) has been calculated by bottom-up approaches based on local processing. In contrast with them, in this paper, a top-down approach based on expanding in turn from the lowest order mode the whole motion in an image pair of sequential images is proposed. The intensity of medical images usually represents a quantity which is conserved during the motion. Hence sequential images are ideally related by a coordinate transformation. The displacement field can be determined from the generalized moments of the two images. The equations which transform arbitrary generalized moments from a source image to a target image are expressed as a function of the displacement field. The appareent displacement field is then computed iteratively by a projection method which utilizes the functional derivatives of the linearized moment equations. This method is demonstrated using a pair of sequential heart images. For comparative evaluation, we applied Horn and Schunck's method, a standard multigrid method, and our proposed algorithm to sequential image.
Keywords
Motion image; Optical flow; Medical image; Moment transform;
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