Scannerless loss modulated flash color range imaging
| DWPI Title: Method for providing three dimensional (3D) image of target for application e.g. facial recognition, involves comparing unmodulated and modulated images having respective modulation frequencies equal and not equal to zero |
| Abstract: Scannerless loss modulated flash color range imaging methods and apparatus are disclosed for producing three dimensional (3D) images of a target within a scene. Apparatus and methods according to the present invention comprise a light source providing at least three wavelengths (passbands) of illumination that are each loss modulated, phase delayed and simultaneously directed to illuminate the target. Phase delayed light backscattered from the target is spectrally filtered, demodulated and imaged by a planar detector array. Images of the intensity distributions for the selected wavelengths are obtained under modulated and unmodulated (dc) illumination of the target, and the information contained in the images combined to produce a 3D image of the target. |
| Use: Method for providing three dimensional image of target for application such as facial recognition, robotic machine, industrial inspection and measurement, collision avoidance, automated rendezvous and docking. |
| Advantage: The 3D image is generated inexpensively based on range information which is determined by comparing modulated an unmodulated images. |
| Novelty: The intensity of light from a light source (102) having three wavelengths is modulated by a modulator (105). The light is delayed by delay lines (108a-c) and illuminated on a target (124). The backscattered light is demodulated by a demodulator (120). The modulated and unmodulated images of intensity distribution for each wavelength with respective modulation frequencies equal and not equal to zero are obtained by an array detector (122). The 3D image of target is generated based on range information which is determined by comparing modulated and unmodulated images. |
| Filed: 10/18/2007 |
| Application Number: US2007874241A |
| Tech ID: SD 10058.1 |
| This invention was made with Government support under Contract No. DE-NA0003525 awarded by the United States Department of Energy/National Nuclear Security Administration. The Government has certain rights in the invention. |
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