Hierarchical feature selection for erythema severity estimation

Li Wang; Chenbo Shi; Chang Shu

doi:10.1117/12.2074369

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29 October 2014 Hierarchical feature selection for erythema severity estimation

Li Wang, Chenbo Shi, Chang Shu

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Proceedings Volume 9273, Optoelectronic Imaging and Multimedia Technology III; 927323 (2014) https://doi.org/10.1117/12.2074369
Event: SPIE/COS Photonics Asia, 2014, Beijing, China

Abstract

At present PASI system of scoring is used for evaluating erythema severity, which can help doctors to diagnose psoriasis [1-3]. The system relies on the subjective judge of doctors, where the accuracy and stability cannot be guaranteed [4]. This paper proposes a stable and precise algorithm for erythema severity estimation. Our contributions are twofold. On one hand, in order to extract the multi-scale redness of erythema, we design the hierarchical feature. Different from traditional methods, we not only utilize the color statistical features, but also divide the detect window into small window and extract hierarchical features. Further, a feature re-ranking step is introduced, which can guarantee that extracted features are irrelevant to each other. On the other hand, an adaptive boosting classifier is applied for further feature selection. During the step of training, the classifier will seek out the most valuable feature for evaluating erythema severity, due to its strong learning ability. Experimental results demonstrate the high precision and robustness of our algorithm. The accuracy is 80.1% on the dataset which comprise 116 patients’ images with various kinds of erythema. Now our system has been applied for erythema medical efficacy evaluation in Union Hosp, China.

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Li Wang, Chenbo Shi, and Chang Shu "Hierarchical feature selection for erythema severity estimation", Proc. SPIE 9273, Optoelectronic Imaging and Multimedia Technology III, 927323 (29 October 2014); https://doi.org/10.1117/12.2074369

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