1. A method of identifying relevant areas in digital images, said method comprising receiving information representative of pixels in a first digital image, calculating a sum, a mean, or a median of said information for groups of neighboring pixels in said first image to form a group value for each group of pixels, calculating differences between group values, comparing said differences to a predetermined threshold value, if said difference is equal to or above said threshold value, identifying said group as being in a relevant area, and if said difference is below said threshold value, identifying said group as being in a not relevant area.