1. A method of displaying an image, said image having structures therein, said image being transformed into digital image data, the method comprising the steps of: inputting said image data, said image data representing pixel values corresponding to the grey values of said image; calculating a histogram of said image data, said histogram representing pixel values by the number of pixels with said pixel value in said image data; segmenting the histogram using piecewise constant regression to obtain a plurality of magnitude constant segments, said segments being a statistical representation of a structure of said image; and displaying the image using at least one of said magnitude constant segments on a display terminal.