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Problems about the offset of DLP LightCrafter

user6158159
Prodigy 20 points

Hello, I have some questions about offset and hope to get answers.

For structured light measurement and 3D vision applications, can I use 100% offset lightcrafter for point cloud generation?

For calibration and triangle reconstruction algorithms ,is 100% offset device the same as zero offset?  Can I use the zero offset algorithm on the 100% offset device? What's the difference between 0 offset and 100% offset devices on point cloud generation algorithms ?Does the 100% offset device's imaging model satisfy pinhole imaging model as the camera？

For 3D vision applications,  when using the 100% offset device ,what's the requirement for mounting positions of DLP devices and camera ?What is the difference of  mounting positions between zero offset and 100% offset devices？

Thanks & Regards

  • 0
    TI__Mastermind 22830 points

    Hi,

    Welcome to DLP forum and thank you for your interest in DLP technology.

    We will investigate this subject and get back to you by middle of the week.

    regards,

    Vivek

  • 0 in reply to Vivek Thakur
    Prodigy 20 points

    Thanks.Look forward to your reply.

  • 0 in reply to user6158159
    TI__Mastermind 22830 points

    Hello,

    Thank you for your patience.  Please find the response to your questions:

    1. "For structured light measurement and 3D vision applications, can I use 100% offset lightcrafter for point cloud generation? "

    Yes , you can use projector with 100% off-sets for structured light application.

    2. "For calibration and triangle reconstruction algorithms ,is 100% offset device the same as zero offset?  Can I use the zero offset algorithm on the 100% offset device? What's the difference between 0 offset and 100% offset devices on point cloud generation algorithms ?Does the 100% offset device's imaging model satisfy pinhole imaging model as the camera？"

    The projector’s vertical offset needs to be part of the calibration data used by the 3D vision application SW. This information, along with the camera calibration parameters, is usually obtained through camera-projector calibration methods.

    The pinhole model (camera or projector), should work for all possible vertical offset configurations, provided that the actual vertical offset number (usually called “principal point” in the 3D vision/metrology lexicon) is part of the calibration data.

    Please note that the vertical offset number used for point cloud calculations should match the actual/physical vertical offset of the projection lens, otherwise the obtained point cloud will be inaccurate.

    3. "For 3D vision applications,  when using the 100% offset device ,what's the requirement for mounting positions of DLP devices and camera ?What is the difference of  mounting positions between zero offset and 100% offset devices？"

    For camera mounting, the only requirement is for the projected images/patterns to be entirely visible to the camera at all operating distances. In general, a positive (non-zero) vertical offset would require tilting the camera upward (a positive pitch angle) to be able to capture all of the projected pixels.

    regards,

    Vivek