Calibration info for a single image
If the image isn’t calibrated by the device or by the calibration table, you can calibrate a single image
yourself.
3.1 How to calibrate a single image
To calibrate a single image, please use the following procedure:
Take an image with the device or import the image into the image library of Examine Pro.
Use an object you know the measurement of, for example a paperclip or a coin
Open
the image in a viewport.
Click on the
Annotations button
Select the
Measure tab
Select the
Line tool
and draw a line on the image (the length of the line is in pixels, this is an
indication that the image is not calibrated).
Choose the
Calibrate tab
(you will find it next to the Implants tab – if available)
Fill in the real length/size of the object.
Click
Apply
and you will see the size will turn into mm.
Now this
single image
is calibrated and you can use the calibration value to measure additional
things
When you know you will use more images from the same device or you will import more images
from the same origin, you can setup the calibration value into the
calibration table
. Depending
on the image size you can define the calibration value, so images with the
same size
will use the
same calibration
value.
4
How to setup the calibration table
Go to
Options
in the Mediadent menu, and click on
Calibration table
A
The calibration table will be shown
Click on the
Add button
Fill in the values you can see in the
calibrate tab
of the annotations window
Click on the
Save button
and then the
Exit button
.
A
As a result images imported with the size 600x600 pixels, will be automatically calibrated
with 17177 pixels/meter.
Important note: The values used in this example are fictitious and cannot be used on real life
examples of images. They are used to show the functionality in Mediadent.
153 %Examine Pro gebruikt de kalibratietabel als er geen kalibratie informatie beschikbaar is vanuit de module. De kalibratietabel bevat een lijst met vaste afbeeldingsgroottes en de bijbehorende kalibratiewaarde (pixels/meter). Een afbeelding met een breedt van 468 en hoogte van 578 wordt gekalibreerd als 21700 pixels/meter.
...
De waarden in deze tabel kunnen worden aangepast. Zie hiervoor Kalibratietabel wijzigen.