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Lecture Notes in Computer Science
In this work, we present a method to uncover shape from webcams "in the wild." We present a variant of photometric stereo which uses the sun as a distant light source, so that lighting direction can be computed from known GPS and timestamps. We propose an iterative, non-linear optimization process that optimizes the error in reproducing all images from an extended time-lapse with an image formation model that accounts for ambient lighting, shadows, changing light color, dense surface normaldoi:10.1007/978-3-642-33709-3_26 fatcat:47zicyul4zdztfd7tiwmhvapta