Method and Apparatus for Compressive Acquisition of Depth Range

Technology #15495

Questions about this technology? Ask a Technology Manager

Download Printable PDF

Image Gallery
FIG. 1A is a block diagram illustrating an exemplary imaging system in which spatial modulation of transmitted light is used in accordance with an embodiment;FIG. 1B is a block diagram illustrating an exemplary imaging system in which light is spatially modulated after reflection from a scene of interest in accordance with an embodiment;FIG. 2 is a flowchart illustrating a machine implemented method for use in recovering depth information for a scene of interest in accordance with an embodiment;FIG. 3 is a flowchart illustrating a machine implemented method for use in processing digital sample data to generate a depth map for a scene of interest in accordance with an embodiment;FIGS. 4A is a diagram illustrating a coordinate system for use in describing an imaging environment in accordance with an embodiment;FIGS. 4B is a diagram illustrating a coordinate system for use in describing an imaging environment in accordance with an embodiment;FIGS. 4C and 4D are diagrams illustrating a coordinate system for use in describing an imaging environment in accordance with an embodiment;FIGS. 5A and 5B are diagrams illustrating the response of a single rectangular facet of a scene of interest to a fully transparent SLM pattern in accordance with an embodiment;FIGS. 5C is a diagram illustrating the response of a single rectangular facet of a scene of interest to a fully transparent SLM pattern in accordance with an embodiment;
Categories
Inventors
Ahmed Kirmani
Research Laboratory of Electronics, MIT
Vivek Goyal
Research Laboratory of Electronics, MIT
Managed By
Dave Sossen
MIT Technology Licensing Officer
Patent Protection

Method and Apparatus to Determine Depth Information For A Scene of Interest

US Patent 8,982,363
Publications
CoDAC: A Compressive Depth Acquisition Camera Framework
Proc. IEEE Int. Conf. Acoustics, Speech, and Signal Processing (Kyoto, Japan), March 2012, pp. 3809-3812.

Applications

This technology is useful for 3D sensing and imaging applications.

Problem Addressed

Traditional methods of sensing three-dimensional (3D) scenes suffer from poor spatial resolution, low range accuracy, and the high cost of its implementation. Therefore, it is desirable to develop a depth acquisition system that possesses high spatial resolution without increasing the device cost and complexity.

Technology

The invention captures depth information for a three-dimensional scene in an efficient and cost-effective manner using only a single time-resolved detector and a pulsed laser diode as the illumination unit. The system achieves spatial resolution through patterned sensing of the scene using a digital micro-mirror device (DMD) array. The depth map reconstruction uses parametric signal modeling to recover the set of distinct depth ranges present in the scene. Then, using a convex program that exploits the sparsity of the Laplacian of the depth map, the spatial content at the estimated depth ranges is recovered.

Advantages

  • Higher spatial resolution, lower device cost and complexity than conventional 3D acquisition techniques.
  • Well suited for limited energy availability application such as battery powered applications and applications with smaller form factor e.g. laptops, digital cameras, etc.
  • Capable of minimizing the negative effects of ambient light when capturing 3D scenes.