One-day outdoor photometric stereo via skylight estimation

Abstract

We present an outdoor photometric stereo method us-ing images captured in a single day. We simulate a sky hemisphere for each image according to its GPS and times-tamp, and parameterize the obtained sky hemisphere into a quadratic skylight and a Gaussian sunlight distribution. Unlike previous works which usually model outdoor illu-mination as a sum of constant ambient light and a distant point light, our method models natural illumination accord-ing to a popular sky model and thus provides sufficient con-straints for shape reconstruction from one day images. We generate pixel profiles of uniformly sampled unit vectors for the corresponding time of captures and evaluate them using correlation with the actual pixel profiles. The estimated sur-face normal is refined by MRF optimization. We have tested our method to recover objects and scenes of various sizes in real-world outdoor daylight. 1

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