Biomedical Engineering Reference
In-Depth Information
efficiencies, ensuring digital image data is optimized for parametric analysis
and event characterization. Ancillary technologies include advanced illu-
mination techniques, including high brightness laser illumination, arc dis-
charge lamp illumination, plasma lighting, structured lighting, and signal
enhancement techniques. Custom MATLAB
®
routines are often employed
for analysis of x-ray imagery. Specialized image acquisition methodologies
are enhanced with data fusion from fiber-optic sensors and strain gauges,
providing enhanced event characterization.
A typical process flow is illustrated in Figure 6.15 for an event employ-
ing, for example, high-speed video acquisition, x-ray cineradiography, sur-
face deformation, and an integrated sensor suite. Event characterization
may include analysis of impact velocity and velocity curves, pitch and yaw
during trajectory and at impact, and deformation, providing correlation to a
range of parameters.
A typical problem uses an image as an intermediate data structure, formed
from raw data, which is analyzed further to extract desired information.
This information—such as the location of a defect in a body armor image—
can best be determined only after thoroughly understanding the physics of
the imaging process and characterizing all available prior knowledge. Given
this understanding, we develop signal processing algorithms that involve
concepts from random signals, statistical inference, optimization theory, and
digital signal processing [13].
A host of high-speed cameras are available commercially, including Vision
Research Phantoms and Photron high-speed cameras (see Figure 6.16).
Image
acquisition
Terahertz imaging
and spectroscopy
Image
processing
and
analysis
Data
presentation
and archiving
Impact plane
Flash X-
ray
cineradio-
graphy
Sensor fusion/Data
cloud integration
visualization and
parametric analysis
Post processing, data
storage and transfer,
media archiving
High speed acquisition
Fiber sensor inserts
for energy dissipation
measurement
Full field surface
deformation digital
image correlation
Technical lighting
VCSEL
Arc discharge
plasma
Structured lighting
projector
VCSEL
Acquisition
illumination
FIGURE 6.15
High-speed video acquisition process.
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