Segmentation of Skin Cancer Images

Results:
Fig. 1: (a) A color image showing an atypical lesion. (b) Image obtained after mapping colors into intensities in such a way that the intensity at a pixel is proportional to the CIELAB color distance (14) of the pixel to the average color of the background. (c) Gradient magnitudes of (b) obtained by the Soble operator. Larger gradients are shown brighter.


Fig. 2: (a) A desirable function for mapping color distances to image intensities. (b) Approximation of function (a) by (1/sqrt(2pi) x sigma)(1-exp(i^2 / 2sigma^2)).

Fig. 3. (a) Transforming intensities of Fig. 1b according to the function of Fig. 2b. (b) Smoothing of (a) with a 2-D Gaussian kernel of standard deviation 2 pixels.