Testo 875-1 [21/65] Creating image overlay with twinpix
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Testo 875-1 [21/65] Creating image overlay with twinpix

Testo 875-1 [21/65] Creating image overlay with twinpix
6 Using the software
21
6.3.4. Creating image overlay with TwinPix
An image overlay can be created using the IR image and the
attached real image
2
(taken with the thermal imager) or the
imported real image (taken with a separate imager) (see Real
image document window page 34). Both images can be shown
together in one image. The images are aligned by setting marking
points.
The image overlay simplifies the orientation in the image, whereby
the localization of certain measurement points is made easier, for
example.
1. Click on TwinPix .
- The Wizard for TwinPix is opened.
- The First steps tab contains a description of the image overlay
function. This tab can be hidden: Do not show this page
again.
2. Click on the Image markings tab.
3. Set marking points in the IR image and the real image. Note the
following while doing this:
• Set the marking points at the same position in both images:
Use distinctive spots. The zoomed image sections with the
cursor position displayed below the images help with
precise positioning.
• Distribute the marking points throughout the image. Set
additional marking points in the image area that is of
particular importance (if possible).
• The marking points must be set in the same order in both
images.
• At least four marking points must be set.
• The points are numbered automatically.
To move a marking point:
> Move marking point with mouse button pressed.
To delete a marking point:
> Select the point in the list below the image and click on
[Delete].
- The point is deleted. The corresponding point with the same
number in the other image is also deleted.
4. Click on [Continue].
- The image overlay is displayed.
2
The real-image lens and IR lens have a different slant due to the special
separation. This means that the image areas do not correspond exactly
(parallax error).

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