Concept
DigImage: Particle Tracking
:::: IMAGE CAPTURE
:::: PARTICLE LOCATION
:::: PARTICLE MATCHING
:::: OPERATION
Subsequent Analysis
:::: STRUCTURE OF FILES
:::: BASIC OPERATION OF TRK2DVEL
:::: CONFIGURATION OF TRK2DVEL
:::: FACILITIES
Advanced Features
:::: PARTICLE-TAGGED DATA
:::: IMAGE PREPROCESSING
Experimental Hints
Index
The particle tracking may be customised in a number of ways with user supplied subroutines to perform pre-processing of the images and to determine and record auxiliary particle-tagged data such as particle size, shape and orientation.
The particle tracking process includes a user-hook to enable additional data concerning the particles being tracked (or another feature of the flow) to be stored in a special file with the .HOK extension. The user-hook is contained in the Fortran file User_Obj\Trk2Hook.OBJ. This hook is provided full access to the raw image, along with a list of the particles already found and their associated intensities. One record of data must be saved for each particle in the list. This particle-tagged data may be of any length or complexity, depending on the user specification. Typical uses of this facility are to record size/shape/orientation of the particles, or features about the background intensity in the neighbourhood of the particle. For complete details, please refer to Document\Trk2Hook.DOC.
This feature
is also invoked through the User_Obj\Trk2Hook.OBJ
file and may be used to perform arbitrary pre-processing operations
on the images prior to locating the particles. Again, refer to
Document\Trk2Hook.DOC
for details.
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