The cancerous or pre-cancerous tissue visualization method comprisesproviding a fluorescence intensity image as well as a fluorescence lifetime image of the tissuelocalizing a region of healthy tissue and a region of cancerous or pre-cancerous tissue in the fluorescence intensity imageidentifying in the fluorescence lifetime image one or more first pixels corresponding to the region of healthy tissue and one or more second pixels corresponding to the region of cancerous or pre-cancerous tissuedefining a weighting function mapping fluorescence lifetime values onto weighting factors in a range from a predetermined low weighting factor to a predetermined high weighting factor based upon the constraint that the weighting function maps a fluorescence lifetime value contained in the one or more first pixels onto the low weighting factor and a fluorescence lifetime value contained in the one or more second pixels onto the high weighting factorproducing a weighted fluorescence intensity image by weighting the fluorescence intensity values contained in the pixels of the fluorescence intensity image with weighting factors obtained by evaluation of the weighting function at the fluorescence lifetime values contained in corresponding pixels of the fluorescence lifetime imagedisplaying the weighted fluorescence intensity image.
