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HD mode F.A.Q.

 

What is the HD mode:
The High Definition mode is a completely new algorithm that greatly enhances the quality of Artec Eva and Artec Leo scans.

 

What are the advantages of using the HD mode:

  • The HD mode can increase the resolution of the scan data up to 2X*
    *In order to get a visible improvement at 0.2 resolution, the “HD Data Density” setting should be set to higher than default, and the object must be scanned well.

  • Gets rid of most 3D noise, resulting in a very clean model

mceclip6.png

  • Improves edge curvature and sharp/thin edges reconstruction

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  • Enhances the reconstruction of hard-to-reach areas and difficult-to-scan surfaces

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  • Decreases texture bias (false geometry reconstruction originating from high-contrast texture)
    Screenshot_2020-10-15_at_00.39.06.png

 

How does the HD mode work (for Artec Eva):

  • In order for raw Eva scans to be converted into HD, the "Use HD reconstruction" setting needs to be enabled before the scanning process is started.Screenshot_2020-10-15_at_00.20.01.png
  • For this reason, it is NOT possible to enhance the quality of scans that were made prior to AS15.1.
  • The scanning process itself remains unchanged. HD processing is performed after scanning, generating HD versions of the scans while also keeping the “Standard Definition” (SD) scans.
  • Each HD scan will contain several times more points in comparison to an SD scan. Due to this, HD scans require at least twice more RAM than their SD counterparts.

Important note: When working with the Eva scanner, HD reconstruction can only be performed immediately after scanning. If the HD reconstruction process is canceled, it will no longer be possible to convert the scans to HD. Saving/closing the project and reopening it later to convert the scans is also not possible. Please keep this important information in mind when working with the HD mode.

 

How does the HD mode work (for Artec Leo):

  • On the Leo scanner, the "Record HD data" parameter needs to be enabled in “Settings” before the scanning process is started.
    The default setting of 1/8 can be used in most cases: this will result in each 8th recorded frame being an HD frame. The 1/4 setting (as seen in the screenshot below) will result in each 4th recorded frame being an HD frame.

    2020-10-15_09-27-33-483.png

  • With the setting enabled, the scanning window will feature an HD Recording button.
    2020-10-15_09-23-48-791.png

  • Projects scanned in HD will also have a corresponding indicator on their preview thumbnail.
    mceclip9.png

  • HD scans made with the Leo scanner are processed during import. The user may choose to either import the scans in SD or HD, by toggling the “Use HD reconstruction” checkbox in the import dialog window.
    mceclip11.png

  • HD scans cannot be saved to the MicroSD card. They can only be imported via an ethernet or Wi-Fi connection. An ethernet connection will provide considerably faster import speeds, and is the recommended way of transferring Leo projects.


Can the Artec Eva Lite
scanner be used in HD mode:

No, the Eva Lite does not support HD mode.

 

Do the Artec [Space] Spider, Artec Micro or Artec Ray scanners work in HD mode:

No, the HD mode is not available for Artec [Space] Spider, Artec Micro or Artec Ray scanners.

 

What does the "HD data density" setting do:

  • “HD data density” is a key parameter for HD reconstruction. It controls the balance between resolution and reconstruction enhancement of the HD mode, and notably impacts the size of the HD-processed scans.
  • The multiplier number in the “HD data density” setting reflects the number of points that an HD scan will have in comparison to its SD counterpart (e.g. an HD scan processed with the "4x" HD data density setting will have 4 times more points than the corresponding SD scan). The more points the scans will have, the more RAM they will need, and the more time all the algorithms and tools will require during post-processing.
  • The “HD data density” setting does not affect the duration of the HD reconstruction process that is executed after scanning. The reconstruction process will be of equal duration regardless of the density setting chosen.
  • HD scans made with the "1x" setting will be of roughly equal size as normal SD scans. The 1x setting is recommended for users with low-end PC configurations or users who value the HD mode mainly for its noise reduction and more accurate edge and corner reconstruction capabilities. A noticeable resolution increase is not to be expected when using the 1x setting.

What is HD reconstruction sensitivity:

The “HD reconstruction sensitivity” setting allows decreasing the amount of noise on the scans.

 

Troubleshooting HD reconstruction performance issues:

  • HD reconstruction is a complex process that requires a lot of computing power and memory.
    The hardware requirements for the HD mode can be found here.
    In order for the algorithm to perform optimally, an adequate GPU is required: a modern NVIDIA graphics card with at least 2GB of VRAM (for Artec Eva) or at least 4GB of VRAM (for Artec Leo).
    For optimal calculation times, an NVIDIA card with a CUDA compute capability of at least 6.1 and 8+ GB of VRAM is highly recommended.


  • Since HD scans have more points and require more RAM, a minimum of 32 GB RAM is recommended for a smooth post-processing experience.
    When working with larger projects and higher-than-default HD Data Density values, having 64+ GB RAM is highly recommended.


  • Artec Studio will determine whether or not the installed GPU, driver, or CUDA version is supported by the HD mode. In case of an inadequate GPU (or incompatible driver version), the CPU will be used for the calculations instead, and the user will receive the following warning message: "HD reconstruction may take several hours".
    Please consult this article in order to resolve the issue.
    Screenshot_2020-10-15_at_00.20.01.png

  • A short, manual test can also be performed in order to ensure that the HD reconstructing is using the GPU (and not the CPU):

    1. a) For Eva – enable the “Use HD reconstruction” option in the Scan panel:
      Screenshot_2020-10-15_at_00.20.01.png

      b) For Leo – enable "Record HD data" in Settings.
      2020-10-15_09-28-47-155.png

    2. Record ~100 frames (Eva), or ~800 frames (Leo, with HD setting on 1/8).
    3. a) For Eva – Close the Scan panel to run the HD reconstruction algorithm.
      b) For Leo – Import the project with the "Use HD Reconstruction" checkbox enabled.
    4. Make sure that HD data appears in the workspace after the algorithm is complete.
    5. Calculate the FPS reconstruction rate (a measure of how many raw frames the algorithm can process per second) by dividing the exact number of frames by the time elapsed during HD reconstruction.

     

    The table below is structured into three groups, based on the HD reconstruction speed/performance of each GPU:
    Slow: 1.5 - 2.5 FPS
    Normal: 2.5 - 4.5 FPS
    Fast: 4.5 FPS and higher

mceclip15.png

If the reconstruction speed is slower than 1 frame per second, your GPU is most likely not being used.
Please refer to this article for instructions on updating your GPU driver.

 

 

 

In case you experience any issues with your Artec 3D scanner or require technical assistance with your device or Artec Studio, in the first instance please contact your local Artec dealer/distributor directly. You can also contact the Artec Support Team by clicking on the the "Submit a request" button at the bottom right of the page, or by emailing support@artec3d.com.