Dalsa QuickCam, User Manual

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53 QuickCam User’s Manul
03-032-10187-04 DALSA corp.
7.2 Setting a Region of Interest
The region of interest is your desired calibration region. The region of interest
determines the pixel range used when calibrating gains, offsets and pixel
coefficients.
In most applications, the field of view exceeds the required object size and these
extraneous areas can be ignored. It is recommended that you set the region of
interest a few pixels inside the actual useable image.
To set the camera’s region of interest:
1. Open the Calibration tab in the Camera Configuration Window .
Under Region of Interest :
2. Enter the region of interest to use in the X1 and X2 text boxes.
3. Click Apply .
4. To save the settings to the camera’s nonvolatile memory, click Save Camera
Settings .
7.3 Viewing a Region of Interest
You can view the region of interest in the Image Output Window .
To view the region of interest:
1. If the camera is currently grabbing images, stop grabbing images by clicking
the button on the toolbar.
2. Open the Calibration tab in the Camera Configuration window.
Under Region of Interest :
3. Enter the region of interest to use in the X1 and X2 text boxes.
4. Click Apply .
5. On the QuickCam toolbar, click the to view the area defined by the
region of interest.
The line disappears when you begin imaging again.
7.4 Performing Flat Field Correction
The QuickCam application has the ability to calculate correction coefficients in
order to remove non-uniformity in the image. This video correction operates on a
pixel-by-pixel basis and implements a two point correction for each pixel. This
correction can reduce or eliminate image distortion caused by the following
factors:
ƒ
Fixed Pattern Noise (FPN)
ƒ
Photo Response Non Uniformity (PRNU)
ƒ
Lens and light source non-uniformity