Image Tracking: Overview - CellScale BioTester User Manual

Image Tracking: Overview

Image tracking is a function that can be used to quantify the
motions of image features (rake tines, specimen texture and
fiducial markers). This can be useful for studying localized
specimen deformations,
comparing the results of one test to another.
The image tracking engine is based on a template matching
algorithm. This algorithm starts by defining a "patch" of pixels
(called a template) surrounding the selected source point on the
source image. It then determines the optimal location for this
template on a target image within a specified search region.
The algorithm defines the location of the tracked point on the target image as the centre of the
optimally located template.
To track an image, follow these steps:
1. Click the Create button in the
tracking window, shown above.
This brings up the Tracking Editor
dialogue box.
2. Enter a Tracking Name.
3. Select the Source Image in the
test image list tree, and click Set
to the left of the Source box.
4. Select the Target Images in the
test image list tree, and click Set
to the left of the Target box. The
target image list will automatically
be sorted to remove duplicates
and be put in sequential order.
5. Generate source points on the
source image by performing the
following steps:
a. Manually click source point
locations on the source image
with the Add button depressed.
b. Draw a box on the source image with the Select button depressed, then click the
Grid button and define a grid of points.
The displayed image will automatically change to the source image when either the Add
or Grid buttons are depressed.
verifying strain magnitudes,
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