Rainbow Flash Camera: Depth Edge Extraction Using Complementary Colors

    •  Taguchi, Y., "Rainbow Flash Camera: Depth Edge Extraction Using Complementary Colors", European Conference on Computer Vision (ECCV), October 2012, vol. 7577, pp. 513-527.
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      • @inproceedings{Taguchi2012oct2,
      • author = {Taguchi, Y.},
      • title = {Rainbow Flash Camera: Depth Edge Extraction Using Complementary Colors},
      • booktitle = {European Conference on Computer Vision (ECCV)},
      • year = 2012,
      • volume = 7577,
      • pages = {513--527},
      • month = oct,
      • url = {}
      • }
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    Computer Vision

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We present a novel color multiplexing method for extracting depth edges in a scene. It has been shown that casting shadows from different light positions provides a simple yet robust cue for extracting depth edges. Instead of flashing a single light source at a time as in conventional methods, our method flashes all light sources simultaneously to reduce the number of captured images. We use a ring light source around a camera and arrange colors on the ring such that the colors form a hue circle. Because complementary colors are arranged at any position and its antipole on the ring, shadow regions where a half of the hue circle is occluded are colorized according to the orientations of depth edges, while non-shadow regions where all the hues are mixed have a neutral color in the captured image. In an ideal situation, the colored shadows in a single image directly provide depth edges and their orientations. In practice, we present a robust depth edge extraction algorithm using an additional image captured by rotating the hue circle with 180 degrees. We demonstrate the advantages of our approach using a camera prototype consisting of a standard camera and 8 color LEDs.