National Instruments IMAQTM 用户手册
Chapter 6
Calibrating Images
© National Instruments Corporation
6-5
Figure 6-4. Defining a Coordinate System
Learning Calibration Information
After you define a calibration grid and reference axis, acquire an image of
the grid using the current imaging setup. For information about acquiring
images, refer to the
the grid using the current imaging setup. For information about acquiring
images, refer to the
section of Chapter 2,
. The grid does not need to occupy the entire
image. You can choose a region within the image that contains the grid.
After you acquire an image of the grid, learn the calibration information
by inputting the image of the grid into
After you acquire an image of the grid, learn the calibration information
by inputting the image of the grid into
CWIMAQVision.LearnCalibrationGrid
.
Note
If you want to specify a list of points instead of a grid, use
CWIMAQVision.LearnCalibrationPoints
to learn the calibration information.
Use the CWIMAQCalibrationPoints object to specify the pixel to real-world mapping.
1
Default Origin in a Calibration Grid Image
2
User-Defined Origin
x
y
1
2
y'
x'
y
x