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Projector & Camera Range

Pieter Smakman
Prodigy 30 points


Dear Sir/Madam,
I am Pieter Smakman, a master student Integrated Product Design at the TU Delft. We are currently building a 3D Scanner for medical purposes, in cooperation with the company Vectory3.
We are considering various options for receiving 3D information for body parts, especially the hand and foot. Your Time-Of-Flight products seem very interesting, especially the DS525/D536 Module. Of course is the DLP technology also important to consider, since it can deliver very detailed depth information very quickly (and from very close). I was wondering:
  • I read a lot about Gesture Control as a strenght of your ToF product. Is it also suitable for receiving high-quality depth information for the creation of a 3D model, or would you recommend another product?
  • What is the minimal distance between the object and the scanner in order to create a quality scan (details at least 1 mm) for both technologies (ToF & LightCrafter); Therefore i would like to learn the smallest distance between the sensor and the surface where it can still focus.
  • Because I want to measure from as close as possible, i'm looking at dedicated lenses and projectors. Is it possible to use another lens and combine this with your ToF or LightCrafter module, and what would you recommend to minimize the distance between the object and the scanner?
I am looking forward to your response,
 
Sincerely,

-- 

Pieter Smakman
  • 0
    TI__Expert 6370 points

    Hi Pieter,

    This is the E2E forum for New DLP Applications, so I will be able to answer any DLP-based questions you have, for more information on TI's ToF offerings, I suggest you post your question on the Sensing E2E forum as they will be able to answer ToF questions much more completely.

    The 3D Machine Vision SDK currently available for the LightCrafter4500 receives high-quality depth information on the order of microns (depending partially on your scanning set-up). This accuracy is one of the main advantages over ToF options.

    The LightCrafter4500 has a projection distance from .5m to infinity. It is possible to replace the optics on the LightCrafter EVM to suit your needs, however it should be noted that doing so will void the warranty of the device.

    Best Regards,

    Trevor

  • 0 in reply to Trevor Dowd
    Prodigy 30 points

    Dear Trevor,

    Thanks for your fast and helpful response! The accuracy of the Structured Light product (LightCrafter) is definitely a huge advantage over the ToF products, where I believe depth accuracy will not be much better than 2.5 mm.

    However, the close range of the ToF product is very convenient for implementing the solution in the scanner. Do you think that it could be possible to reduce the minimum distance of 0.5 m to 0.2 (or smaller) for the LightCrafter by using a wide-angle lens and then re-calibrate the module? Or is this minimum distance more dependent on the projector of this module?

    Thanks in advance,

    Pieter

  • 0 in reply to Pieter Smakman
    TI__Expert 6370 points

    Hi Pieter,

    It is possible to move the focus closer. You should be able to change the optics appropriately to get the image in focus wherever you design. The camera and projector information will be updated during calibration as you mentioned.

    It's possible that you may also find that the EVM is able to focus slightly closer than the specified distance of 0.5m as there is a factor of safety built into that specification.

    Please let me know if you have any other questions!

    Best Regards,

    Trevor

  • 0 in reply to Trevor Dowd
    Prodigy 30 points

    Dear Trevor,

    Again thanks for your fast response! It's great to hear that there are a lot of possibilities to change this distance of 0.5 m. I was just wondering:

    I saw a video of FlashScan 3D on your site as a consumer case, and it seems that they did a great job in minimizing the required distance for the lightcrafter. Did they also change the optics in the module?

    Can you recommend any (suppliers of) lenses that could be used to minimize the distance? And is it also possible to change the projector to this distance? I want to be able to scan an object of at least 25 cm x 15 cm from a distance of max. 20 cm.

    Is this calibration with a new lens and/or projector quite straightforward with the included firmware and software bundle, or does it require a lot of extra coding?

    Thanks in advance!

    Sincerely,

    Pieter

  • 0 in reply to Pieter Smakman
    TI__Expert 6370 points

    Hi Pieter,

    While I cannot talk about specific customer applications (other than what is included in the video), I can share some recommendations on where to go for optics and optics designs.  DLP has a network of design houses that specialize in custom optics designs that can help you with what you are looking for. You can find more information on our Design Network here: http://www.ti.com/lsds/ti/analog/dlp/solutions-services.page

    The procedure for calibrating the system with a new lens is the same as the procedure for calibration with the original lens. The step-by-step guide to that calibration process can be found in section 3 of the 3D Machine Vision User's Guide: http://www.ti.com/lit/dlpu019

    Also, for more information on the Accurate Point Cloud Generation for 3D Machine Vision Applications using DLP® Technology TI Design, you can visit this page for downloads, test data, and helpful guides: http://www.ti.com/tool/tida-00254

    I hope this helps!

    Best Regards,

    Trevor