Logarithmic Fuzzy Entropy Function for Similarity Measurement in Multimodal Medical Images Registration

Figure 1

Yellow curve: y = x/(1 + x) − x/2; blue curve: y = −xlog(x); purple curve: y = −[xlog(x) + (1 − x)log(1 − x)]; orange curve: y = x  exp(1 − x) + (1 − x)exp(x) − 1.