Computes surface normals using four images with light source in different places.
时间: 2024-06-03 08:07:50 浏览: 21
To compute surface normals using four images with light sources in different places, we can use photometric stereo.
Photometric stereo is a technique that uses multiple images of an object taken under different lighting conditions to estimate the surface normals of the object. By analyzing how the brightness of each pixel in the images changes as the light source moves, we can determine the orientation of the surface at that point.
The basic steps of photometric stereo are as follows:
1. Take at least three images of the object under different lighting conditions. Each image should have a different light source position relative to the object.
2. Calculate the surface normals at each pixel by solving the system of equations that relates the brightness of each pixel to the surface normal and the light source direction.
3. Smooth the surface normals to remove noise and outliers.
4. Use the surface normals to reconstruct the 3D shape of the object.
5. Optionally, refine the shape using other techniques such as depth from focus or stereo.
By using four images instead of three, we can improve the accuracy of the surface normal estimation and reduce the effects of shadows and specular reflections. However, more images also mean more computation time and higher computational complexity.