Recovering photometric properties of architectural scenes from photographs
Proceedings of the 25th annual conference on Computer graphics and interactive techniques
A practical analytic model for daylight
Proceedings of the 26th annual conference on Computer graphics and interactive techniques
Detecting Moving Shadows: Algorithms and Evaluation
IEEE Transactions on Pattern Analysis and Machine Intelligence
Inverse rendering for computer graphics
Inverse rendering for computer graphics
Shadow removal from a real picture
ACM SIGGRAPH 2003 Sketches & Applications
Relighting Acquired Models of Outdoor Scenes
3DIM '05 Proceedings of the Fifth International Conference on 3-D Digital Imaging and Modeling
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We present a technique for simulating variations in appearance of aerial images at different sun angles. The input to the algorithm is a single aerial image with information on the orientation of surfaces in the image. The location, date, and time at which the photograph was taken are also needed by the algorithm. The appearance of the aerial image at a new sun angle is synthesized by compensating for the direct sunlight component in the original image, and then relighting the image with sunlight from the new sun position. Techniques to remove cast shadows are also described. We demonstrate our results with images, and animations of changing lighting in aerial photographs as the sun follows a trajectory across the sky.