BASIC OPERATION OF TRK2DVEL

Contents

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

3.2 BASIC OPERATION OF TRK2DVEL

The Trk2DVel system consists of a suite of three programs, all of which are accessed by the Trk2DVel command. User-written programs may readily be added to the suite in a user-transparent manner. The structure and operation of Trk2DVel is similar to that of the main DigImage suite, though its purpose is to produce numerical and graphical analyses of the particle paths, rather than to acquire analyse images. As a result it does not include the basic acquisition and image manipulation facilities of the main DigImage suite.

As with the main DigImage system, the major part of the user documentation concerning Trk2DVel is provided by the context sensitive Help System accessed through <f1>. Trk2DVel may be run either interactively, or using command files with the same basic file format and syntax as DigImage.

Only a smaller range of the function key short cuts are available, reflecting the less general nature of Trk2DVel. In particular the following DigImage keys are implemented:

Function Key	Description
<f1>	Give help on the current activity. Pressing this key in response to a submenu will bring up a help page giving details of the various options available within the current submenu.
<shift><f1>	This key combination will display this General Help file.
<ctrl><f1>	This combination brings up a brief summary of the facilities available through the function keys.
<f2>	Displays a listing of the files in a user-specified directory. Defaults to the current directory.
<shift><f2>	No effect from -> prompts. Displays the history list for => prompts.
<ctrl><f2>	Change the current working directory.
<f3>	Display the previous output buffer.
<shift><f3>	Display the next output buffer.
<ctrl><f3>	Prompt for a buffer to be displayed.
<f4>	Same as <ctrl><f4>.
<shift><f4>	Same as <ctrl><f4>.
<ctrl><f4>	Specify a particular output look up table.
<alt><f4>	Show the DigImage news file (HlpFiles\@News.HLP).
<f6>	Open a DigImage Journal File. All keyboard input during the DigImage session (unless a command file is subsequently opened) will be recorded in this file along with comments, warning messages etc. This facility is of particular value for use when creating command files. The Journal File may be edited to provide the desired command sequence, or, for relatively simple command structures, used in its raw form. By default a .JNL extension will be added to the file name if none is specified.
<shift><f6>	Close the DigImage Journal File previously opened by <f6>.
<ctrl><f6>	Type on the screen the contents of the specified file, one page at a time.
<alt><f6>	Delete the specified file.
<f11>	Copy current buffer to user-specified destination.
<ctrl><f11>	This function key can be used to start the current screen saver at any stage where user input is requested. Note that if the frame grabber is in active use (either acquiring images or performing ALU operations) then only the computer monitor screen saver will be used.
<alt><f11>	The normal automatic starting of the screen saver can be enabled or disabled by this key combination. The screen saver will be automatically invoked under the following conditions (only the first three apply for the computer monitor):The screen saver is not disabledTrk2DVel is in a menuThe specified time must have elapsed since the last user operation (this time is set by the CONFIGUR utility)The frame grabber is not acquiring an imageThe frame grabber is not be executing an ALU instruction

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