[Camera N: Calibration (3D Camera Image Input)]

By setting the calibration, the measurement result can be converted and output as actual dimensions. Select your calibration method.
There are three calibration methods as shown below.
Table: Calibration (3D Camera Image Input)
Item
Description
Section to see
Point
Set up calibration by specifying any preferable points (in pixels).
Parameter
Set up by inputting values directly.
Sampling
Set by sampling measurement.
You can check the contents of the set calibration data.
View Calibration Parameters
For calibration, see User's Manual, "Terminology".
Note
  • When measurement results are to be output in actual dimension, set [Calibration] to "ON" in [Output parameter] for each unit. If [Calibration] is "OFF" (factory default), the coordinate values of the camera image are output as measurement results.
Important
  • [Camera N: Calibration] is used to set the calibration (function to convert to actual dimension) for the standard camera (camera photographing the object to be measured from the front). Even when 3D cameras are connected, this must be set when using only the front camera to measure 2D processing items. For 3D processing, calibration to spatial coordinate must be performed after calibration to actual dimension. Be sure to set the following.

Setting up Calibration by Specifying Any Points (Point)

This is a method to set calibration by specifying any points (in pixels).
The calibration parameter is calculated automatically when the actual coordinate of the specified location is entered. Up to 3 points can be specified.
  • When magnification is the same in X and Y directions
    Specify only 2 points.
    Description diagram when magnification is the same in X and Y calibration directions
  • When magnification is not the same in X and Y directions
    Specify 3 points.
    Description diagram when magnification is not the same in X and Y calibration directions
Note
  • When 2 points are specified, the coordinate system is set to left-handed system (forward in the clockwise direction). Specify 3 points to perform calibration including the coordinate system.
  1. In the "Item tab" area, tap [Calibration].
    Calibration
  2. In the "Calibration setting" area, select "Point".
    Calibration - Calibration Setting Area
  3. In the "Point" area, add a point coordinate pair.
    Adding point coordinates
    1. In the "Image display" area, tap a point whose position coordinates are to be added.
      The added point coordinates and the corresponding actual coordinates are reflected on the Point List.
      Calibration - Point Area
      Coordinates for up to 3 points can be added.
    Editing coordinates
    1. Select coordinates you want to edit on the Point List, and tap [Edit].
      Calibration - Point Area
    2. In the Coordinate Setting window, tap [...] for "Point" and "Actual", and specify the X and Y coordinate values for each of them.
      For how to input value, see User's Manual, "Inputting a Value"
      Coordinate Setting Window
      Table: Calibration Setting (3D Camera Image Input) - Point
      Actual Coordinate
      Set Value
      [Factory Default]
      Point coordinate X
      0 to 99999.9999
      [Point you tapped in the window]
      Point coordinate Y
      0 to 99999.9999
      [Point you tapped in the window]
      Actual coordinate X
      -99999.9999 to 99999.9999
      [0]
      Actual coordinate Y
      -99999.9999 to 99999.9999
      [0]
    3. Tap [OK].
      The added point coordinates and the corresponding actual coordinates are reflected on the Point List.
    Deleting Point Coordinates
    1. Select the coordinates you want to delete on the Point List, and tap [Del].
      Calibration - Point Area
      A confirmation window is displayed.
    2. Tap [OK].
  4. Repeat the Step 3 to add point coordinates.
  5. Tap [Generate calibration parameters].
    Calibration - Point Area
    Calibration parameters are generated.
For the subsequent operations, see Setting [3D Camera Image Input].

Setting up Calibration by Entering Values (Parameter)

Directly enter values as calibration data.
  1. In the "Item tab" area, tap [Calibration].
    Calibration
  2. In the "Calibration setting" area, select "Parameter".
    Calibration - Calibration Setting Area
  3. In the "Parameter" area, tap [Icon] for "Coordinate" and select a coordinate system.
    Calibration - Parameter Area
    • Lefthand: Clockwise is forward when specifying the coordinate.
    • Righthand: Counter-clockwise is forward when specifying the coordinate.
    Diagram describing the Coordinate System
  4. Tap [Icon] for "Origin" and choose where to place the origin of the actual coordinate.
    Calibration - Parameter Area
    Diagram describing how to specify the coordinate origin
  5. Tap [...] for "Magnification" and input a value of the actual size corresponding to one pixel.
    Allowed range: 0.00001 to 9.99999
    For how to input value, see User's Manual, "Inputting a Value"
    Calibration - Parameter Area
  6. Tap [Generate calibration parameters].
    Calibration - Parameter Area
    Calibration parameters are generated.
For the subsequent operations, see Setting [3D Camera Image Input].

Setting up Calibration by Sampling Measurement (Sampling)

This is a method to set calibration based on measurement result.
Actual coordinates can be obtained by registering the model and searching the specified measurement area. Calibration parameters are calculated automatically from the obtained actual coordinates.
  1. In the "Item tab" area, tap [Calibration].
    Calibration
  2. In the "Calibration setting" area, select "Sampling".
    Calibration - Calibration Setting Area
  3. In the "Sampling" area, tap [Regist model].
    Calibration - Sampling Area
  4. Register a model using the Drawing Tools.
    Calibration - Drawing Tools
  5. Set the search region as necessary.
    1. In the "Sampling" area, tap [Search region].
      Calibration - Sampling Area
    2. Set the search region using the Drawing Tools.
      The default is the entire screen.
  6. Tap [Sampling measurement].
    Calibration - Sampling Area
    Measurement is performed.
    The search result (cross-shaped cursor) is displayed in the "Image display" area, and the Sampling Coordinate window is displayed.
  7. In the Sampling Coordinate window, tap [...] to enter the X and Y values.
    For how to input value, see User's Manual, "Inputting a Value"
    You can also use the arrow buttons to set the values.
    Sampling Coordinate window
  8. Tap [OK].
    Point coordinates and actual coordinates are registered in the sampling area.
    Calibration - Sampling Area
  9. Move the object to be measured and repeat the Steps 3 to 8.
  10. Tap [Generate calibration parameters].
    Calibration - Sampling Area
    Calibration parameters are displayed.
    Calibration - Calibration Parameter Area
For the subsequent operations, see Setting [3D Camera Image Input].

View Calibration Parameters

View the set calibration data.
  1. In the "Item tab" area, tap [Calibration].
  2. In the "Calibration parameter" area, confirm the calibration data.
    Calibration - Calibration Parameter Area
    Table: View Calibration Parameters
    Item
    Set Value
    [Factory Default]
    Description
    A
    Calculated value
    [1.000]
    These are calibration conversion values. Camera coordinates are converted to actual coordinates based on these calibration conversion values. The conversion formulas to actual coordinates are as follows:
    • (X, Y): Measurement point (camera coordinates), Unit: pix
    • (X', Y'): Conversion point (actual coordinates)
    X'=A x X + B x Y + C
    Y'=D x X + E x Y + F
    B
    Calculated value
    [0.000]
    C
    Calculated value
    [0.000]
    D
    Calculated value
    [0.000]
    E
    Calculated value
    [1.000]
    F
    Calculated value
    [0.000]
    Sight
    Calculated value
    [640]
    This is an actual dimension in the X direction.