June 2014
Intermediate to advanced
576 pages
16h 43m
English
book
Image Analysis, Classification and Change Detection in Remote Sensing, 3rd Edition
by Morton J. Canty
Content preview from Image Analysis, Classification and Change Detection in Remote Sensing, 3rd Edition
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358 Unsupervised Classification
8.7.1 Segmenting a classified image
The ENVI Classic menu c ommand
C
lassification/Post Classification/Segmentation Image
provides a simple mechanism to convert a classification image into a segmented
image by means of blobbing, i.e., finding c onnected regions. Unfortunately, this
command does not r espect cla ss labels. The IDL program SEGMENT_CLASS_RUN,
which is described in Appendix C and an excerpt of which is shown in List-
ing 8.10, may be used as a replacement. In lines 2 to 1 2 of the listing, the
IDL function LABEL_REGION() is used to segment each selected class succes-
sively. Connected regions smaller than a user-defined ...
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