Figure 3

Application of the tumour extraction algorithm with and without colour deconvolution. The algorithm was applied basal cell carcinoma images of the infiltrative (A), nodular (D), and superficial (G) subtypes. The performance of the algorithm was evaluated by identifying pixels containing true positive pixels (white), false negative pixels (blue), and false positive pixels (red) in the images pre-processed using colour deconvolution (B, E, H), and the images without colour deconvolution (C, F, I).