User`s guide

12-5
Modified Behavior for the regionprops ConvexHull Property
The 'ConvexHull' property of regionprops depends on the MATLAB convhull function.
Due to changes in convhull, the results returned by 'ConvexHull' will now be slightly
different than in previous releases.
Compatibility Considerations
The order of the vertices returned by the 'ConvexHull' property of regionprops may
differ from that returned in releases before R2009b. Also, the returned hull may contain
additional collinear points that were omitted in previous releases.
Efficient Display and Navigation of Very Large NITF-File Images in imtool
The rsetwrite function allows you to create multi-resolution image pyramids (R-Sets)
that you can open in imtool. In previous releases, rsetwrite worked only with TIFF
files. Now it accepts NITF files, as well, as long as they are Version 2.0 or greater,
contain an uncompressed image, have integer data (no floating point data), and have
three or fewer image bands. Finally, if a NITF file has more than one band of data, the
data must be unsigned.
Performance Improvements
The performance of several existing toolbox functions has been improved in this release.
In some cases, other toolbox functions call these functions and therefore will also benefit
from these speed improvements.
Faster Functions
• bwdist
• imcomplement
• imdilate
• imerode
• imfilter
• improfile
• imrotate