1. A method of identifying image areas that show a same person in different images, the method comprising capturing color pixel values of a first and second image; selecting a first and second image area in the first and second image respectively; computing a first and second primary histogram of pixels in the first and second area respectively, the primary histograms representing sums of contributions from pixels with color values in histogram bins, each histogram bin corresponding to a combination of a range of color values and a range of heights of the pixels in the first or second image area, the ranges of color values being normalized relative to a distribution of color pixel values in the first and second area respectively; computing first and second secondary histograms of pixels in the first and second area respectively, the secondary histograms representing sums of contributions from pixels with color values in further histogram bins for ranges of color values that are at least partly independent of the distribution; computing a first histogram intersection score of the first and second primary histograms; computing a second histogram intersection score of the first and secondary histograms; computing a combined detection score from the first and second histogram scores.