Tamarisk
®
Camera Control Software User Guide
7.3 CUSTOM LENS CALIBRATION AND CUSTOM PIXEL MAP TABS ARE NON
FUNCTIONAL
• The Custom Lens Calibration and Custom Pixel Map tabs are non-functional but the other tabs
are functional
The Custom Lens Calibration and Custom Pixel Map tabs are only enabled for cameras
that have FPGA firmware version 01.00.0076 or higher.
7.4 CUSTOM LENS CALIBRATED CAMERA HAS POOR VIDEO
Focus on an object far in the distance. Do not focus the camera on the uniform black
body.
Ensure that the uniform black body is truly uniform and stable before beginning the
custom lens calibration
Ensure that the custom lens calibration option is enabled by selecting the correct
calibration table.
Power cycle the camera to ensure that the calibration settings are applied
The dynamic range may be too small or too large. Adjust the temperature of the black
bodies to ensure adequate dynamic range over the scene temperature desired.
Ensure that air conditioning or air is not blowing on the camera or the black body during
the Custom Lens Calibration process. The air movement can cause thermal gradients
which will show up as gain or offset errors and cause poor image uniformity. For best
results the test environment should be thermally static.
Ensure that the custom lens and lens mount are tightly coupled to the TIM. For best
results the TIM, lens mount, and lens should be isothermal.
Do not rely on the analog video output to determine the video quality. If the image is
extremely uniform the AGC will cause the image to look like it has more noise. To
properly evaluate the image quality, the user should look at the pre AGC, Camera Link
video data. The user should plot the histogram of the output image while looking at a
uniform black body. Figure 62 shows the same camera (with a custom lens) while looking
at the same black body. The histogram on the left is with the custom lens calibration
disabled. The histogram on the right is with the custom lens calibration enabled. Notice
that the pixel distribution on the right is much tighter (which is expected and desired). But
while looking at the analog output image (while looking at the same black body), the
image with the custom lens calibration looks worse; this is because the AGC is trying to
apply gain correction over a narrow (uniform) scene.
To Next Page
Loading...
