1. A method, comprising: computing a first color parameter based on a set of image color values of pixels of a digital image; defining a plurality of fuzzy membership functions correlated to image colors, said plurality of fuzzy membership functions comprising a first fuzzy color membership function having a trend defined by said first color parameter; applying to a current pixel of the digital image a fuzzy inference procedure based on said plurality of fuzzy membership functions; and classifying the current pixel as a fire image pixel based on the applying of the fuzzy inference procedure to the current pixel.