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Comput Biol Med. 2015 Apr;59:106-15. doi: 10.1016/j.compbiomed.2015.01.023. Epub 2015 Feb 9.

No-reference hair occlusion assessment for dermoscopy images based on distribution feature.

Author information

1
Image Processing Center, School of Astronautics, BeiHang University, Beijing 100191, China. Electronic address: xfy_73@buaa.edu.cn.
2
Image Processing Center, School of Astronautics, BeiHang University, Beijing 100191, China. Electronic address: oskorlee@gmail.com.
3
General Hospital of the Air Force, PLA, Beijing 100036, China. Electronic address: mrs5822@163.com.
4
Image Processing Center, School of Astronautics, BeiHang University, Beijing 100191, China. Electronic address: jiangzg@buaa.edu.cn.

Abstract

The presence of hair is a common quality problem for dermoscopy images, which may influence the accuracy of lesion analysis. In this paper, a novel no-reference hair occlusion assessment method is proposed according to the distribution feature of hairs in the dermoscopy image. Firstly, the image is adaptively enhanced by simple linear iterative clustering (SLIC) combined with isotropic nonlinear filtering (INF). Then, hairs are extracted from the image by an automatic threshold and meanwhile the postprocessing is used to refine the hair through re-extracting omissive hairs and filtering false hairs. Finally, the degree of hair occlusion is evaluated by an objective metric based on the hair distribution. A series of experiments was carried out on both simulated images and real images. The result shows that the proposed local adaptive hair detection method can work well on both sparse hair and dense hair, and the designed metric can effectively evaluate the degree of hair occlusion.

KEYWORDS:

Dermoscopy image; Hair detection; Hair occlusion; Image quality; No-reference assessment

[Indexed for MEDLINE]

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