Biomedical Engineering Reference
In-Depth Information
Video Frame
Capture
Select Region
of Interest
Filtering and Grayscale
Conversion
Magnetic Sensor
Posture
Canny's
Algorithm
Hough
CircleAlgorithm
Kinematics
Center of the
catheter
Contour of the
Cross-section
IVUS Posture
Coordinates Conversion
and Scaling
Kinematics
Contour Coordinates referred to the global coordinate
system
3D Rendering
3D Blood Vessel Imaging
Figure 7.25
Flux diagram for image processing and sensor data integration
for vasculature imaging.
As IVUS works in high frequency, therefore a noise reduction
iltering should be applied for preserving and enhancing the edges
before border detection. For that a median ilter with mask size
of 5
×
5 pixels was selected because this iltering is relatively fast.
Also a binary threshold is applied to the grayscale images for image
segmentation according to the histogram.
After obtaining the contour from Canny Algorithm, the contour
coordinates relative the image center can be calculated and expressed
with:
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