Improved methods of estimating shape from shading using the light source coordinate system
Artificial Intelligence
International Journal of Computer Vision
A novel algorithm for color constancy
International Journal of Computer Vision
Estimation of Illuminant Direction, Albedo, and Shape from Shading
IEEE Transactions on Pattern Analysis and Machine Intelligence
IEEE Transactions on Pattern Analysis and Machine Intelligence
Randomized Hough transform: improved ellipse detection with comparison
Pattern Recognition Letters
Computer and Robot Vision
Markov Random Field Models for Unsupervised Segmentation of Textured Color Images
IEEE Transactions on Pattern Analysis and Machine Intelligence
Computing illumination-invariant descriptors of spatially filtered color image regions
IEEE Transactions on Image Processing
Robust recovery of multiple light source based on local light source constant constraint
Pattern Recognition Letters
Estimation of Illuminant Direction and Intensity of Multiple Light Sources
ECCV '02 Proceedings of the 7th European Conference on Computer Vision-Part IV
Estimation of Multiple Illuminants from a Single Image of Arbitrary Known Geometry
ECCV '02 Proceedings of the 7th European Conference on Computer Vision-Part III
Estimation of multiple directional light sources for synthesis of augmented reality images
Graphical Models - Special issue on Pacific graphics 2002
Multiple Light Source Detection
IEEE Transactions on Pattern Analysis and Machine Intelligence
Cast shadow segmentation using invariant color features
Computer Vision and Image Understanding
International Journal of Computer Vision
A unified framework for scene illuminant estimation
Image and Vision Computing
Estimation of multiple directional illuminants from a single image
Image and Vision Computing
Recovering surface reflectance and multiple light locations and intensities from image data
Pattern Recognition Letters
EURASIP Journal on Advances in Signal Processing
Recovering Light Directions and Camera Poses from a Single Sphere
ECCV '08 Proceedings of the 10th European Conference on Computer Vision: Part I
Difference sphere: An approach to near light source estimation
Computer Vision and Image Understanding
Joint Estimation of Shape and Reflectance using Multiple Images with Known Illumination Conditions
International Journal of Computer Vision
Using real shadows to create virtual ones
SCIA'03 Proceedings of the 13th Scandinavian conference on Image analysis
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We present a methodology for calibrating multiple light source locations in 3D from images. The procedure involves the use of a novel calibration object that consists of three spheres at known relative positions. The process uses intensity images to find the positions of the light sources. We conducted experiments to locate light sources in 51 different positions in a laboratory setting. Our data shows that the vector from a point in the scene to a light source can be measured to within $2.7 \pm .4 ^{\circ }$ at $ \alpha =.05 $ (6 percent relative) of its true direction and within $0.13 \pm .02 $ m at $ \alpha =.05 $ (9 percent relative) of its true magnitude compared to empirically measured ground truth. Finally, we demonstrate how light source information is used for color correction.