DocumentCode :
18394
Title :
Local Diagonal Extrema Pattern: A New and Efficient Feature Descriptor for CT Image Retrieval
Author :
Dubey, Shiv Ram ; Singh, Satish Kumar ; Singh, Rajat Kumar
Author_Institution :
Indian Inst. of Inf. Technol. Allahabad, Allahabad, India
Volume :
22
Issue :
9
fYear :
2015
fDate :
Sept. 2015
Firstpage :
1215
Lastpage :
1219
Abstract :
The medical image retrieval plays an important role in medical diagnosis where a physician can retrieve most similar images from template images against a query image of a particular patient. In this letter, a new and efficient image features descriptor based on the local diagonal extrema pattern (LDEP) is proposed for CT image retrieval. The proposed approach finds the values and indexes of the local diagonal extremas to exploit the relationship among the diagonal neighbors of any center pixel of the image using first-order local diagonal derivatives. The intensity values of the local diagonal extremas are compared with the intensity value of the center pixel to utilize the relationship of central pixel with its neighbors. Finally, the descriptor is formed on the basis of the indexes and comparison of center pixel and local diagonal extremas. The consideration of only diagonal neighbors greatly reduces the dimension of the feature vector which speeds up the image retrieval task and solves the “Curse of dimensionality” problem also. The LDEP is tested for CT image retrieval over Emphysema-CT and NEMA-CT databases and compared with the existing approaches. The superiority in terms of performance and efficiency in terms of speedup of the proposed method are confirmed by the experiments.
Keywords :
computerised tomography; image retrieval; medical image processing; CT image retrieval; NEMA-CT databases; diagonal neighbors; dimensionality curse problem; emphysema-CT databases; first-order local diagonal derivatives; image features descriptor; local diagonal extrema pattern; medical image retrieval; Biomedical imaging; Computed tomography; Feature extraction; Image retrieval; Indexes; Medical services; Vectors; CT image retrieval; LBP; LTCoP; LTP; Local features; local diagonal neighbors; medical image;
fLanguage :
English
Journal_Title :
Signal Processing Letters, IEEE
Publisher :
ieee
ISSN :
1070-9908
Type :
jour
DOI :
10.1109/LSP.2015.2392623
Filename :
7009996
Link To Document :
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