# Photometric stereo

Photometric stereo is a technique used to estimate the shape of an object from a set of images taken from different angles. The technique works by taking multiple pictures of an object from different angles and using the differences in the brightness of the object in each image to calculate the shape of the object.

### What is photometric stereo used for?

Photometric stereo is a technique that can be used to estimate the shape of an object from a set of images taken from different viewpoints. It works by taking advantage of the fact that the brightness of a point on an object's surface will vary depending on the angle at which it is viewed. By measuring the brightness of a point in different images, it is possible to calculate the angle of incidence of the light at that point, and thus to reconstruct the surface of the object.

Photometric stereo has a number of applications, including 3D scanning, microscopy, and computer vision. It can be used to create accurate 3D models of objects, to measure small features on surfaces, and to track objects in video. What is the first step in photometric stereo? The first step in photometric stereo is to take multiple pictures of an object from different angles, using a light source that is at a different angle for each picture. What is the minimum number of images needed for running photometric stereo? The minimum number of images needed for running photometric stereo is three. This is because photometric stereo requires at least three different light sources in order to create a 3D model of an object. What is called photometry? Photometry is the science of measuring the flux of electromagnetic radiation. The flux can be measured in terms of the power per unit area, or the luminance. The SI unit for photometry is the candela per square metre (cd/m2).

### What is albedo computer vision?

Albedo computer vision is the process of determining the reflective properties of a surface from an image. The albedo of a surface is a measure of how much light it reflects. The albedo of a black surface, for example, is very low, while the albedo of a white surface is very high.

The albedo of a surface can be determined from an image by measuring the intensity of light reflected from the surface. This can be done by taking the ratio of the intensity of the light reflected from the surface to the intensity of the light incident on the surface.

The albedo of a surface can also be determined from an image by measuring the color of light reflected from the surface. The albedo of a surface is usually different for different wavelengths of light.

The albedo of a surface can be used to estimate the reflectance of the surface. The reflectance of a surface is the fraction of light that is reflected from the surface. The reflectance of a black surface, for example, is very low, while the reflectance of a white surface is very high.

The albedo of a surface can also be used to estimate the emittance of the surface. The emittance of a surface is the fraction of light that is emitted by the surface. The emittance of a black surface is very low, while the emittance of a white surface is very high.