We have developed an improved version of a high-definition real-time depth-mapping Axi-Vision Camera that enhances the speed of the depth detection, reduces external light interference, and is more compact. The new depth-detection method uses a high-resolution, fast-frame-rate CMOS sensor with a rolling shutter. The depth is calculated from four near-infrared light (NIR) images in successive video frames to cancel the effects of external light interference. Therefore, the external light interference immunity is improved so that the depth information can be detected accurately under external light at an intensity up to 30% of that of NIR light illumination. Furthermore, the compact-imaging optical system is achieved by using a specially designed HDTV camera lens, which internally separates only NIR light and provides NIR images on an image intensifier coupled with a CMOS sensor. Further compact sizing of the camera system is achieved by arranging specially developed small, high-power reflection-type LED arrays for the NIR illumination around the camera lens. As a result of this compact sizing, the volume is 1/5 that of the prototype system. We also demonstrated a method to obtain 3-D information from image data captured by this Axi-Vision Camera.
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