A method for measuring/recognizing a shape uses at least two electromagnetic oscillations aimed at the measurement subject from two different directions. A device is provided for taking an image of the illuminated subject in a digital form. The image matrix of the image in a digital form is read pixel by pixel and the illuminated strength values of the same pixel from different directions are compared with each other. The difference of the strength values of the two wavelengths of each pixel is added to the corresponding difference of the preceding pixel in the reading direction.