Revisiting Pentland ' s estimator of light source direction

  title={Revisiting Pentland ' s estimator of light source direction},
  author={Wojciech Chojnacki and Michael J. Brooks},
Received February 3, 1993; revised manuscript received July 22, 1993; accepted July 22, 1993 We examine the pioneering method of Pentland [J. Opt. Soc. Am. 72, 448 (1982)] for automatically estimating the direction of the "sun" (light source) from a single image. It is shown that, under the assumptions used in the derivation of the method, the estimate of source direction is erroneous. Specifically, it is shown that an image-based expression used in calculating source direction diverges to… CONTINUE READING
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