Three-dimensional imaging system with a stereo vision capturing and wavefront reconstruction

Abstract

A three-dimensional (3D) imaging system which consists of an equipment for stereo vision capturing and optical wavefront recontruction is developed. In the system, after acquisition of stereo images, depth maps are calculated by means of an area-based stereo matching algorithm. Hologram pattern is generated from the obtained depth maps with digital signal processing and displayed on a spatial light modulator. A three-dimensional image is reconstructed by illuminating plane wave of coherent light to the modulator. The attractve feature of the imaging system is to contstruct a holographic display without an optical interferometer for hologram recording. We fabricate a prototype of a stereo vision equipment and capture a target object. To obtain the depth map, we apply various methods of area-based stereo maching. The experimental results showed that a sum of absolute difference method provides desired depth maps. We calcuate an in-line hologram pattern with electronic signal processing. In the numerical reconstruction, 3D objects are reconstructed successfully. These results have shown usefulness of the proposed system.