User`s guide

3 Using the Image Acquisition Tool GUI
Memory Logging
If you select Memory or Disk and M em ory in the Logging To fiel d, the
Memory Limit fie ld will display how much memory is available on your
system.
This is equal to the total number of bytes image acquisition frames can occupy
in memory. By default, th e tool sets this limit to eq ual all available physical
memory at the time the tool is first used, or 1 GB, whichever is less.
Disk Logging
If you select Disk or Disk and Memory in the Logging To fi el d, the Disk
Logging field will become editable so you can designate a f il e and locatio n to
save to.
To use disk logging:
1 Click the Browse button to select a location for the file, or type the location.
2 In the Open dialog box, enter a name in the File name fi eld, and click
Open.
The
.avi extension is appended to the nam e on the Logging tab, and
the other fields will become editable.
3 Leave Compression set to the default of None, or select a compression
codec from the drop-down list to e nable file compression. The compre ssion
choices are
Indeo3, Indeo5,andCinepak for most devices. Grayscale
devices also support
MSVC an d RLE.
If you select a compression codec, set the Quality and Key Frames Per
Second fields or leave the default settings. For the Quality setting,
lowering the number results in smaller log files, but a lower quality. The
MATLAB default is
75%. The Key Frames Per Second field determines
theratioofframesthatgetcompressedversusframesthatjustcalculate
the delta from the last frame. The value of
2.14 is the MATLAB defa ul t.
Larger numbers would result in a higher image quality, b ut a larger log
file. The trade-off is quality of the image versus size of the log file.
3-14