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Range-finding projectors: Visualizing range information without sensors

We describe sensorless visualizing techniques of 3D range information of object surfaces, in which the range information is projected directly onto the real-world surface by projectors. The proposed system consists of two projectors that merely project still images. Two techniques, namely, contour map projection based on the moire method and pseudo-color map projection based on complementary colors, are shown to be used simultaneously.