VIOSO 6
Exaplay Documentation
  • Welcome to VIOSO 6
  • Changelog and Version History
  • System Preparation
    • Operating System
      • Visual Studio Runtime
      • DirectX Runtime
    • Graphics cards
      • Display Adaptors
      • NVIDIA RTX/Quadro Setup
        • Find and install NVIDIA Drivers
        • EDID Emulation
        • 3D Settings for video playback
        • NVIDIA Mosaic
        • Output Synchronization
      • Others/onBoard GPUs
      • Expanders
    • Network
      • setup a network of fixed IPs
      • firewall configuration
      • camera network
      • remote access via LAN and internet
      • Network settings in VIOSO 6
    • Camera
      • Webcams
      • VIOSO Camera kits
        • Configuring Daheng Cameras
        • Configuring HIK Vision Cameras
        • Configuring IDS Imaging Cameras
      • SLR Cameras via USB connection
      • Other IP-cameras (IP, cctv etc)
    • Projectors
      • Blacklevel explained
    • Deploy VIOSO 6
      • Licensing
        • License information
        • Demo License
        • License Activation
        • License Transfer
        • Maintenance
      • First Init & Autostart
      • Updating VIOSO 6
  • Getting Started
    • Testpattern
    • Project Mode vs. Free Mode
    • Free Mode
      • Multiclient Configuration (Abstract Displays)
      • 3D Model Handling
    • Project Mode
      • Project Creation
      • Designer
  • Calibration
    • Scanning
      • Device Selection
      • Camera adjustment
        • Webcams / DirectShow devices
        • Using Daheng Cameras within VIOSO 6
        • Using HIK Vision Cameras within VIOSO 6
        • Camera Masking (Region of interest)
      • Projector masking
      • Scanning projectors
      • Scan Result
    • Content Mapping
      • 3D Mapping
        • 3D Mapping parameters
        • 3D Mapping in Freemode
      • 2D Warp
    • Blending & Global Adjustments
    • Adjust Projectors
  • USING CALIBRATIONS
    • Integrated Videoplayer
    • Export to Exaplay
    • Export to any application
    • Desktop Embedding
    • Real-time Engines
      • Unity3D
      • Unreal Engine
        • UE Examples & Sample files
      • MiddleVR
      • Techviz
    • VIOSO WarpBlend API
      • VIOSOWarpBlend.ini Reference
  • STEP BY STEP GUIDES
    • Calibration for common media servers
      • AV Stumpfl Pixera
        • Pixera v.2
          • Project Mode Walkthrough
          • Free Mode Walkthrough
        • Pixera v.1
      • Dataton Watchout
        • Watchout v.7
        • Watchout v.6
      • Ioversal Vertex
      • 7th Sense Delta Server
      • Christie Pandoras Box
      • Derivative TouchDesigner
      • BrightSign
  • Typical Calibration Workflows
    • Immersive Rooms (free mode)
    • Cylindrical Panorama with fisheye camera (project mode)
    • 3D calibration in VIOSO 6 free mode
  • References
    • Command Line Reference
    • Remote Control Reference
    • Export Automation Reference
    • Scripting for VIOSO applications
  • Tools
    • Configure Mosaic
  • Knowledgebase
    • FAQ
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On this page
  • 1. Adjust brightness
  • 2. Adjust Dot Size
  • 3. Noise Filter Threshold
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  1. Calibration
  2. Scanning

Scanning projectors

PreviousProjector maskingNextScan Result

Last updated 8 months ago

The next steps after configuring the camera is to define settings for the scanning procedure based on the site-specific situation: lighting condition, projector setting, surface and camera setting.

For each projector, a series of settings is defined:

1. Adjust brightness

This step determines the brightness of the projector depending on the camera exposure and reflectivity of the surface.

At first run, the ideal brightness for a projector is determined automatically.

If in doubt, go with this setting and manipulate only if there are obvious issues with the brightness detection.

  • A value between 80 and 95 is ideal as it indicates a certain buffer for brightness adjustments.

  • A value of 100 indicates that the projector signal perceived by the camera has reached it's maximum. Consider to increase the camera sensitivity (longer exposure, open iris)

  • A value <50 usually indicates a way too high signal input, e.g. by a strong light source, reflection of metal, sunlight, etc. Try to remove this source. If not, consider to manually override the brightness until the perceived projection light is appropriate.

Use the slider to adjust the brightness or re-run the automatic brightness detection by pressing Automatic.

Continue to the next step by pressing Next.

2. Adjust Dot Size

This visual feedback loop is crucial. It allows you to define the level of detail for the test pattern, which is essential for accurately capturing the projector’s mapping and the surface properties.

The success of the auto-alignment process hinges on how the camera perceives and interprets this pattern.

The objective: To see as many dots as possible that are clearly delineated, do not smudge and do not fade away

We always start with dot size = 1.2 and margin = 0, which surprisingly often works right from the spot

Depending on camera resolution, projector image size, projector resolution and camera distance any other value might be suitable. If in doubt and if the dot pattern looks like in the picture "OK", do not do not alter and give it a try by pressing Next.

If dots keep being blurry, smudged and not clearly delineated, go through these checklist:

Next will proceed to the scanning (see Scan Result).

3. Noise Filter Threshold

In case of troubles getting well detected dots, the threshold for the built-in noise filtering can help to solve the issue. The threshold is determined automatically after the brightness adjustment.

A fading image with dots left out is a typical indicator for an improper threshold:

Klick Threshold to go back one step to the noise filter threshold dialog.

The projector displays a line pattern and the camera tries to find a threshold for the noise filter to keep the lines clearly visible while cutting off noise. Whenever you change the slider thickness, the noise filter analyzes the camera image and tries to find a matching threshold setting.

Use the slider threshold to optimize the result on a line pattern that reflects more or less the size of the dots.

Once a good threshold setting has been determined, click Next to proceed to the dot pattern again.

Dont't be mislead by a morieè effect happening (see ). This is due to the fact that the lines are mostly finer than the camera can resolve. morieè effect has no impact on the scanning quality.

https://en.wikipedia.org/wiki/Line_moir%C3%A9
most likely the noise filter threshold is wrong