SLAMorris Final Thesis After Corrections.pdf - Cranfield University

to a variety of locations on the storage device; the thumbnail cache was then
viewed to ascertain what changes occurred. It was noted that when a file is
created in this way a record relating to the file was not added to the thumbnail
cache. The created source files were then viewed in thumbnail view using the
file explorer, or a dialogue Window used for opening and saving documents.
The analysis of the thumbnail cache showed that viewing the visual thumbnails
in this way led to the creation of a thumbnail record for each potential thumbnail
cache source file.
Figure 6.5shows several files being viewed using the standard file browser
(Windows Explorer). In the first experiment the directory was opened and the
files were viewed without any further interaction; this resulted in each potential
user created thumbnail cache source file having subrecords added into the
thumbcache_256.db and thumbcache_96.db file. The system created images
such as the one used for the directory ‘Not Viewed’ were only added to the
thumbcache_96.db. In the second experiment when the size of the icons used
was increased from medium to large icons, the resulting additions to the
thumbnail cache did not change. The same directory was then viewed using the
extra-large icons; this resulted in the directory visual thumbnail also being
added to the thumbcache_256.db file.
In the third experiment the file ‘Goat.jpg’ was selected using a single click,
which led to the file and its metadata populating the preview and information
panels. On analysis of the thumbnail cache it was recorded that subrecords
were added to the thumbcache_1024.db file when a source file is selected and
previewed in the preview pane of the file browser. A further experiment was
performed with an image file of 1000 x1000, and a second image of 200 x 200
pixels being selected in the same way; on selection of the files the images
populated the preview and information panels. However only the 1000 x 1000
pixel image had a corresponding subrecord added to the thumbcache_1024.db
file; this suggests a subrecord is only added if the image being previewed is
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