The first technique, from which later the Photometric Stereo was derived, was called Photoclinometry
which in short is the ability to create a shape from shading and therefore calculate elevation data (3D data) by analysing the shadows in the image.
We examine the morphometric characteristics by making use of a combined photoclinometry and shape from shading approach.
12) The iterative scheme used for photoclinometry and the SfS approach is described in our two preceding articles published in this journal, and is not repeated here.
Measuring the brightness of sunlight reflected from different parts of the terrain, the scientists used a technique called photoclinometry
to determine differences in the surface elevation.