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Bleeding and Tumor Detection for Capsule Endoscopy Images Using Improved Geometric Feature

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Abstract

This paper presents a method for detecting bleeding and tumors within capsule endoscopy (CE) images. Because CE can be used for visual, non-invasive examinations of the small bowel, it has recently become widely used. However, as a capsule progresses along the gastrointestinal tract, it collects vast quantities of images that make diagnosis a very time-consuming task. To address this problem, many computational approaches for anomaly detection have been proposed. Common to most approaches is the belief that color, texture, and shape are the most promising features for detecting anomalies within CE images. However, given that the requirements for each type of feature vary according to the anomaly, generally, it is essential to apply a complicated combination of techniques for multiple-feature extraction. In this study, in order to realize a scheme that covers the features of color, texture, and shape and can be applied to lesion areas of various sizes, a geometric image feature called local-contrast-enhanced higher-order local auto-correlation (LCE-HLAC) is proposed. Moreover, although the HSV color space is generally regarded as being appropriate for the analysis of CE images, imbalances in the distributions of utilized hue components limit discriminatory performance for normal and anomalous images. Accordingly, an image pre-processing method that uses a non-linear conversion model for the HSV color space is also proposed. Anomaly detection is implemented using a support vector machine classifier. The results of experiments, conducted with normal, bleeding, and tumor images obtained from 28 patients, demonstrate both the feasibility and superiority of the proposed method for both bleeding and tumor detection tasks.

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Authors and Affiliations

  1. Department of Intelligent Interaction Technologies, University of Tsukuba, Tsukuba, 305-8573, Japan

    Erzhong Hu

  2. Artificial Intelligence Research Center, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, 305-8568, Japan

    Hidenori Sakanashi, Hirokazu Nosato, Eiichi Takahashi & Masahiro Murakawa

  3. Department of Gastroenterology, Sakura Medical Center, Toho University, Sakura, 285-8741, Japan

    Yasuo Suzuki, Ken Takeuchi & Hiroshi Aoki

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  1. Erzhong Hu
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  2. Hidenori Sakanashi
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  3. Hirokazu Nosato
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  4. Eiichi Takahashi
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  5. Yasuo Suzuki
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  6. Ken Takeuchi
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  7. Hiroshi Aoki
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  8. Masahiro Murakawa
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Correspondence to Erzhong Hu.

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Hu, E., Sakanashi, H., Nosato, H. et al. Bleeding and Tumor Detection for Capsule Endoscopy Images Using Improved Geometric Feature. J. Med. Biol. Eng. 36, 344–356 (2016). https://doi.org/10.1007/s40846-016-0138-8

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  • DOI: https://doi.org/10.1007/s40846-016-0138-8

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