Browsing by Author "Chen, Huaijin"

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    CS-ToF: High-resolution compressive time-of-flight imaging
    (Optical Society of America, 2017) Li, Fengqiang; Chen, Huaijin; Pediredla, Adithya; Yeh, Chiakai; He, Kuan; Veeraraghavan, Ashok; Cossairt, Oliver
    Three-dimensional imaging using Time-of-flight (ToF) sensors is rapidly gaining widespread adoption in many applications due to their cost effectiveness, simplicity, and compact size. However, the current generation of ToF cameras suffers from low spatial resolution due to physical fabrication limitations. In this paper, we propose CS-ToF, an imaging architecture to achieve high spatial resolution ToF imaging via optical multiplexing and compressive sensing. Our approach is based on the observation that, while depth is non-linearly related to ToF pixel measurements, a phasor representation of captured images results in a linear image formation model. We utilize this property to develop a CS-based technique that is used to recover high resolution 3D images. Based on the proposed architecture, we developed a prototype 1-megapixel compressive ToF camera that achieves as much as 4× improvement in spatial resolution and 3× improvement for natural scenes. We believe that our proposed CS-ToF architecture provides a simple and low-cost solution to improve the spatial resolution of ToF and related sensors.
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    Passive and single-viewpoint 3D imaging system
    (2023-06-13) Wu, Yicheng; Boominathan, Vivek; Chen, Huaijin; Sankaranarayanan, Aswin C.; Veeraraghavan, Ashok; William Marsh Rice University; Carnegie Mellon University; United States Patent and Trademark Office
    A method for a passive single-viewpoint 3D imaging system comprises capturing an image from a camera having one or more phase masks. The method further includes using a reconstruction algorithm, for estimation of a 3D or depth image.
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    Passive and single-viewpoint 3D imaging system
    (2024-08-27) Wu, Yicheng; Boominathan, Vivek; Chen, Huaijin; Sankaranarayanan, Aswin C.; Veeraraghavan, Ashok; Rice University; United States Patent and Trademark Office
    A method for a passive single-viewpoint 3D imaging system comprises capturing an image from a camera having one or more phase masks. The method further includes using a reconstruction algorithm, for estimation of a 3D or depth image.