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Touchscreen everywhere: on transferring a normal planar surface to a touch-sensitive display.

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    A projector and camera create an interactive display on any table surface. This human-computer interface uses structured light sensing for accurate touch detection and interaction.

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    Area of Science:

    • Human-Computer Interaction
    • Computer Vision
    • Optical Sensing

    Background:

    • Traditional interactive displays require specialized hardware.
    • Integrating large displays and touch input in small devices is challenging.
    • Projector-camera systems offer potential for novel interfaces.

    Purpose of the Study:

    • To develop a low-cost, versatile human-computer interface using a projector and camera.
    • To enable a standard table surface to function as both a projection screen and a touch input device.
    • To investigate the feasibility of structured light sensing for touch detection.

    Main Methods:

    • A structured light sensing scheme with a random binary pattern was embedded into the projected display.
    • A camera captured the projected image on a table surface.
    • System calibration, hand segmentation, and homography mapping were used to detect touch events and positions.

    Main Results:

    • The system successfully transformed a regular table surface into a touch-sensitive display.
    • Accurate detection of finger presence, touch location, and trajectory tracking was achieved.
    • The system demonstrated multi-touch capability and efficient performance.

    Conclusions:

    • The proposed projector-camera system offers a feasible and cost-effective solution for creating interactive surfaces.
    • This approach enables large-display, touch-input capabilities using readily available components.
    • The technology has potential applications in various interactive environments.