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research-article

Multiple Illuminant Direction Detection with Application to Image Synthesis

Published: 01 August 2001 Publication History

Abstract

In the early 1980s, Pentland observed that the human's eye is sensitive to the change of intensities. On an image of a smooth surface, the change of intensities is maximal whenever the illuminant direction is perpendicular to the normal of the surface. This motivates us to introduce the concept of critical points, where the surface normal is perpendicular to some light source direction. Apparently, the illuminant direction has a simple geometric relationship with the corresponding critical points. In this paper, for simplicity reasons, we restrict our discussions to the shading of a Lambertian sphere of known size in a multiple distant light source environment. A novel global representation of the intensity function is derived. Based on this intensity characterization, the least-squares and iteration techniques are used to determine critical points and, thus, the light source directions and their intensities if certain conditions are satisfied. The performance of this new approach is evaluated using both synthetic images and real images. As an application, we use it as a tool to determine light sources in real image synthesis. The experimental results show that this technique can be used to superimpose synthetic objects with a real scene.

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  1. Multiple Illuminant Direction Detection with Application to Image Synthesis

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      Published In

      cover image IEEE Transactions on Pattern Analysis and Machine Intelligence
      IEEE Transactions on Pattern Analysis and Machine Intelligence  Volume 23, Issue 8
      August 2001
      142 pages

      Publisher

      IEEE Computer Society

      United States

      Publication History

      Published: 01 August 2001

      Author Tags

      1. Computer vision
      2. critical point
      3. illuminant direction detection
      4. image synthesis.

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