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Automatic Detection of Malignant Melanoma using Macroscopic Images.

Ramezani M, Karimian A, Moallem P - J Med Signals Sens (2014)

Bottom Line: The evaluation measures of classification have indicated that 13 features extracted by PCA method lead to better results than all of the extracted features.These results led to an accuracy of 82.2%, sensitivity of 77% and specificity of 86.93%.The proposed method may help dermatologists to detect the malignant lesions in the primary stages due to the minimum constraints during imaging, the ease of usage by the public and nonexperts, and high accuracy in detection of the lesion type.

View Article: PubMed Central - PubMed

Affiliation: Department of Biomedical Engineering, Faculty of Engineering, University of Isfahan, Isfahan, Iran.

ABSTRACT
In order to distinguish between benign and malignant types of pigmented skin lesions, computerized procedures have been developed for images taken by different equipment that the most available one of them is conventional digital cameras. In this research, a new procedure to detect malignant melanoma from benign pigmented lesions using macroscopic images is presented. The images are taken by conventional digital cameras with spatial resolution higher than one megapixel and by considering no constraints and special conditions during imaging. In the proposed procedure, new methods to weaken the effect of nonuniform illumination, correction of the effect of thick hairs and large glows on the lesion and also, a new threshold-based segmentation algorithm are presented. 187 features representing asymmetry, border irregularity, color variation, diameter and texture are extracted from the lesion area and after reducing the number of features using principal component analysis (PCA), lesions are determined as malignant or benign using support vector machine classifier. According to the dermatologist diagnosis, the proposed processing methods have the ability to detect lesions area with high accuracy. The evaluation measures of classification have indicated that 13 features extracted by PCA method lead to better results than all of the extracted features. These results led to an accuracy of 82.2%, sensitivity of 77% and specificity of 86.93%. The proposed method may help dermatologists to detect the malignant lesions in the primary stages due to the minimum constraints during imaging, the ease of usage by the public and nonexperts, and high accuracy in detection of the lesion type.

No MeSH data available.


Related in: MedlinePlus

(a) Smoothed image of a skin lesion, (b and c) Results of adaption of two-degree polynomial function on the corners samples, (d and e) Results of adaption of three-degree polynomial function on the corners samples, (f and g) Results of adaption of two-degree polynomial function on the frame samples, (h and i) Results of adaption of three-degree polynomial function on the frame samples
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Figure 3: (a) Smoothed image of a skin lesion, (b and c) Results of adaption of two-degree polynomial function on the corners samples, (d and e) Results of adaption of three-degree polynomial function on the corners samples, (f and g) Results of adaption of two-degree polynomial function on the frame samples, (h and i) Results of adaption of three-degree polynomial function on the frame samples

Mentions: Thus, four different planes were estimated which represent four various modes of illumination distribution on the image with respect to the relative area of the lesion in image, location of lesion on body and the way of lighting while imaging. Then four V channels which have uniform illumination are obtained by dividing the original V channel on these four planes. Figure 3 shows the four estimated planes for a skin lesion image and the result of elimination of each one from the image.


Automatic Detection of Malignant Melanoma using Macroscopic Images.

Ramezani M, Karimian A, Moallem P - J Med Signals Sens (2014)

(a) Smoothed image of a skin lesion, (b and c) Results of adaption of two-degree polynomial function on the corners samples, (d and e) Results of adaption of three-degree polynomial function on the corners samples, (f and g) Results of adaption of two-degree polynomial function on the frame samples, (h and i) Results of adaption of three-degree polynomial function on the frame samples
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4236807&req=5

Figure 3: (a) Smoothed image of a skin lesion, (b and c) Results of adaption of two-degree polynomial function on the corners samples, (d and e) Results of adaption of three-degree polynomial function on the corners samples, (f and g) Results of adaption of two-degree polynomial function on the frame samples, (h and i) Results of adaption of three-degree polynomial function on the frame samples
Mentions: Thus, four different planes were estimated which represent four various modes of illumination distribution on the image with respect to the relative area of the lesion in image, location of lesion on body and the way of lighting while imaging. Then four V channels which have uniform illumination are obtained by dividing the original V channel on these four planes. Figure 3 shows the four estimated planes for a skin lesion image and the result of elimination of each one from the image.

Bottom Line: The evaluation measures of classification have indicated that 13 features extracted by PCA method lead to better results than all of the extracted features.These results led to an accuracy of 82.2%, sensitivity of 77% and specificity of 86.93%.The proposed method may help dermatologists to detect the malignant lesions in the primary stages due to the minimum constraints during imaging, the ease of usage by the public and nonexperts, and high accuracy in detection of the lesion type.

View Article: PubMed Central - PubMed

Affiliation: Department of Biomedical Engineering, Faculty of Engineering, University of Isfahan, Isfahan, Iran.

ABSTRACT
In order to distinguish between benign and malignant types of pigmented skin lesions, computerized procedures have been developed for images taken by different equipment that the most available one of them is conventional digital cameras. In this research, a new procedure to detect malignant melanoma from benign pigmented lesions using macroscopic images is presented. The images are taken by conventional digital cameras with spatial resolution higher than one megapixel and by considering no constraints and special conditions during imaging. In the proposed procedure, new methods to weaken the effect of nonuniform illumination, correction of the effect of thick hairs and large glows on the lesion and also, a new threshold-based segmentation algorithm are presented. 187 features representing asymmetry, border irregularity, color variation, diameter and texture are extracted from the lesion area and after reducing the number of features using principal component analysis (PCA), lesions are determined as malignant or benign using support vector machine classifier. According to the dermatologist diagnosis, the proposed processing methods have the ability to detect lesions area with high accuracy. The evaluation measures of classification have indicated that 13 features extracted by PCA method lead to better results than all of the extracted features. These results led to an accuracy of 82.2%, sensitivity of 77% and specificity of 86.93%. The proposed method may help dermatologists to detect the malignant lesions in the primary stages due to the minimum constraints during imaging, the ease of usage by the public and nonexperts, and high accuracy in detection of the lesion type.

No MeSH data available.


Related in: MedlinePlus