TY - JOUR
T1 - Fast and effective similarity search in medical tumor databases using morphology
AU - Korn, Philip
AU - Sidiropoulos, Nicholaos D.
AU - Faloutsos, Christos
AU - Siegel, Eliot L.
AU - Protopapas, Zenon
PY - 1996
Y1 - 1996
N2 - We examine the problem of finding similar tumor shapes. The main contribution of this work is the proposal of a natural (dis-)similarity function for shape matching called the 'morphological distance'. This function has two desirable properties: a) it matches human perception of similarity, as we illustrate with precision/recall experiments; b) it can be lower-bounded by a set of features, leading to fast indexing for range queries and nearest neighbor queries. We use state-of-the-art methods from morphology both in defining our distance function and for feature extraction. In particular, we use the 'size-distribution', related to the 'pattern spectrum', to extract features from shapes. Following Jagadish and Faloutos et. al., we organize the n-d feature points in a spatial access method. We show that any Lp norm in the n-d space lower-bounds the morphological distance. This guarantees no false dismissals for range queries. In addition, we present a nearest neighbor algorithm that also guarantees no false dismissals. We implemented the method and tested it against a testbed of realistic tumor shapes generated by an established tumor- growth model. The response time of our method is up to 27 times faster than sequential scanning. Moreover, precision/recall experiments show that the proposed distance captures very well the dissimilarity as perceived by humans.
AB - We examine the problem of finding similar tumor shapes. The main contribution of this work is the proposal of a natural (dis-)similarity function for shape matching called the 'morphological distance'. This function has two desirable properties: a) it matches human perception of similarity, as we illustrate with precision/recall experiments; b) it can be lower-bounded by a set of features, leading to fast indexing for range queries and nearest neighbor queries. We use state-of-the-art methods from morphology both in defining our distance function and for feature extraction. In particular, we use the 'size-distribution', related to the 'pattern spectrum', to extract features from shapes. Following Jagadish and Faloutos et. al., we organize the n-d feature points in a spatial access method. We show that any Lp norm in the n-d space lower-bounds the morphological distance. This guarantees no false dismissals for range queries. In addition, we present a nearest neighbor algorithm that also guarantees no false dismissals. We implemented the method and tested it against a testbed of realistic tumor shapes generated by an established tumor- growth model. The response time of our method is up to 27 times faster than sequential scanning. Moreover, precision/recall experiments show that the proposed distance captures very well the dissimilarity as perceived by humans.
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U2 - 10.1117/12.257282
DO - 10.1117/12.257282
M3 - Conference article
AN - SCOPUS:33748210970
SN - 0277-786X
VL - 2916
SP - 116
EP - 129
JO - Proceedings of SPIE - The International Society for Optical Engineering
JF - Proceedings of SPIE - The International Society for Optical Engineering
T2 - Multimedia Storage and Archiving Systems
Y2 - 18 November 1996 through 18 November 1996
ER -