DE

Stairs Measurement

Preparation

For stairs measurement please download the special targets and two start boards using the links in the Settings view of the app (one level back). Print the sheets and the targets on cardboard or glue them onto cardboard such that the targets are flat and not moving.

Positioning of the measuring marks

  • Place two markers on each step. The green tip of the marker defines the point to be measured.
  • Place one start board at the bottom platform of the stairs.
  • Place additional targets around the bottom start board.
  • Place the other start board at the top platform of the stairs.
  • Place additional targets around the top start board

Taking photos

The photos must meet the following requirements:
  • The pictures must be sufficiently bright. Turn on all available light sources. The flash of your device's camera is turned on by default. If it isn't, turn it on.
  • Set your device's camera to wide angle/minimum zoom. Do not change the zoom setting while taking photos
  • The images must be perfectly sharp! (see images below)
  • Make sure that at least six targets are visible on each photo. Make sure that the left and the right target of a step are visible in the image
  • Do not move or touch the markers or the start board any more. Even small shifts could distort the measurement result. Start over with the photos if need be.
  • Stand next to the wall or the handrail when taking photos (also on platforms). Standing in the middle of a step or a platform may reduce precision and recognition rates.
Taking photos:
  • Start at the bottom platform.
  • Take seven photos of the starting sheet.
  • Walk up the stairs and take a photo on each step.
  • Take at least seven photos on the top platform, especially from the edges of the platform towards the targets.
  • Walk down the stairs and take a photo on each step.
  • Take seven photos of the starting sheet.
  • Walk up the stairs and take a photo on each step.
  • Take seven photos on the top platform
  • Walk down the stairs and take a photo on each step.
  • Divide the stair platforms into imaginary 50cm x 50cm squares and take photos out of each square.
  • Evaluation

    Click "Compute" in the 3D view. A few seconds later you should see the results. You can export them from the settings menu at the bottom right.

    Right and Wrong

    Do not step on the markers
    Do not step on the markers
    Markers are touched when taking pictures
    Wrong: markers are touched when taking picutres
    Markers clearly visible
    The markers should be clearly visible and, e.g., not be covered by other steps
    Markers not visible on the right side
    Wrong: markers not visible on the right side
    At least six markers per picture
    At least six markers per picture and two per step
    Only one side of a step is visible
    Wrong: Only one side of a step is visible
    Sharp pictures are necessary
    Sharp pictures are absolutely necessary
    Picture not sharp
    Wrong: blurred picture
    4 markers should be used for wide steps
    For steps wider than 30cm, 4 markers should be used per step
    Too long distances between the markers
    Wrong: Too long distances between the markers
    You should go upstairs and downstairs wide-ranging
    You should go upstairs and downstairs on the very left and the very right side of the stairs. so that pictures are taken from as different angles as possible. A dot means that you should take pictures at this position.
    Photos are all taken in the middle of the stairs
    Wrong: Pictures are all taken in the middle of the stairs

    Disclaimer

    The accuracy is influenced by the condition of your device's camera, the condition of the targets and the way the photos are taken. All these factors cannot be controlled by Linearis3D. Linearis3D does not accept any responsibility for the accuracy or feasibility of a measurement. The user must take appropriate measures to make sure that the results meet the user's requirements.