The active contour interactive software
The active contour software was originally developed in a
C++/Tcl-Tk
environment for segmentation of 3D ultrasound data and
later
adapted for segmentation of MRI/CT images. This section gives a
brief
description of the second version.
The version for MRI/CT images can read the binary format of
the VHP
images directly. The following two windows constitute the
main
user-interface (click on any of them for a full sized version):
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1. The first window shows the original image and has the
following functionalities:
- add : Add a polygon by marking a region of interest on
the image, clicking the first mouse button at every point on the
image upon which you wish to place a vertex. Vertices are
automatically connected by lines;
- move polygon : Move an entire polygon to another
location in the image;
- move vertex : Move a vertex of a polygon to another
location in the image. The original links of the polygon remain,
i.e. the neighbouring vertices of the moved vertex are still the
same;
- deform : This causes the closed polygon in the image to
become active and trying to settle down in a minimum according to
the calculated energy of the image;
- delete : Delete a polygon;
- glue : Glue a vertex. A glued vertex will not move when
the deform option is activated.
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2. The second window shows the energy used to drive the active
contour. The energy of the image is obtained by taking the
gradient of the reciprocal of the gradient of a Gaussian
convolved with the image:
The standard deviation of the Gaussian kernel can be varied in
the range 1.0-10.0 pixels with the slider at the bottom of the
window.
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