Photometric stereopython

Photometric stereo is a method of estimating surface geometry by using a fixed-position camera and multiple light sources. It was proposed by Robert J Woodham in 1980 as an alternative to other stereo techniques, that needed two images of the same object, viewed from different directions, to determine its surface orientation. These techniques require some knowledge of the correspondence between picture elements, that is not always easy to achieve. The idea of photometric stereo is to vary the direction of incident illumination between successive images, while the viewing direction is constant; in this way, the correspondence of image points is known beforehand, as the position of the object is not changed, and surface orientation is determined by using the radiance values recorded with the different images.

Photometric stereopdf

This repository contains an implementation of Woodham's algorithm as a standalone module, an example script showing its usage and several example image sets. The algorithm requires the knowledge of light directions. You can set them by using tilt and slant angles (in degrees) or loading a matrix containing the directions. Reference frames are shown in the following images.

Photometric stereosoftware

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Photometric stereogithub

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Photometric stereo has several applications: it is used to detect small surface defects, imperceptible to the human eye; it has also medical applications, i.e. to detect skin lesions and help in the diagnosis of melanoma. More recently, it has been used also to perform a non-invasive 3D scan of surfaces, and as a cheap method to get a real-time facial motion capture, widely used in computer graphics applications.

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