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Proceedings Paper

Feature detector and descriptor for medical images
Author(s): Dusty Sargent; Chao-I Chen; Chang-Ming Tsai; Yuan-Fang Wang; Daniel Koppel
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Paper Abstract

The ability to detect and match features across multiple views of a scene is a crucial first step in many computer vision algorithms for dynamic scene analysis. State-of-the-art methods such as SIFT and SURF perform successfully when applied to typical images taken by a digital camera or camcorder. However, these methods often fail to generate an acceptable number of features when applied to medical images, because such images usually contain large homogeneous regions with little color and intensity variation. As a result, tasks like image registration and 3D structure recovery become difficult or impossible in the medical domain. This paper presents a scale, rotation and color/illumination invariant feature detector and descriptor for medical applications. The method incorporates elements of SIFT and SURF while optimizing their performance on medical data. Based on experiments with various types of medical images, we combined, adjusted, and built on methods and parameter settings employed in both algorithms. An approximate Hessian based detector is used to locate scale invariant keypoints and a dominant orientation is assigned to each keypoint using a gradient orientation histogram, providing rotation invariance. Finally, keypoints are described with an orientation-normalized distribution of gradient responses at the assigned scale, and the feature vector is normalized for contrast invariance. Experiments show that the algorithm detects and matches far more features than SIFT and SURF on medical images, with similar error levels.

Paper Details

Date Published: 27 March 2009
PDF: 8 pages
Proc. SPIE 7259, Medical Imaging 2009: Image Processing, 72592Z (27 March 2009); doi: 10.1117/12.811210
Show Author Affiliations
Dusty Sargent, STI Medical Systems (United States)
Chao-I Chen, Univ. of California, Santa Barbara (United States)
Chang-Ming Tsai, Univ. of California, Santa Barbara (United States)
Yuan-Fang Wang, Univ. of California, Santa Barbara (United States)
Daniel Koppel, STI Medical Systems (United States)

Published in SPIE Proceedings Vol. 7259:
Medical Imaging 2009: Image Processing
Josien P. W. Pluim; Benoit M. Dawant, Editor(s)

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