عضو
ما هوRegions of Interest وكيف عمله لصورة فضائيةفى بر برنامج envi ؟
عضو متميز
بعد التحية
Create and Restore ROIs
1. From the Display group menu bar, select Overlay > Region of Interest. An ROI Tool dialog
appears.
2. Draw a polygon ROI anywhere in the image by clicking repeatedly to define straight-line
segments. Or, draw a free-form polygon by clicking and dragging inside the image.
3. Right-click to complete the ROI and to close the polygon. Right-click again to lock the ROI in
place.
4. In the ROI Tool dialog, click Stats. An ROI Statistics Results dialog appears with an embedded
plot window that shows the following:
l Mean spectrum (white)
l First standard deviation above and below the mean spectrum (green)
l Minimum and maximum envelope containing all of the spectra in the ROI (red)
5. From the ROI Statistics Results dialog menu bar, select File > Cancel.
6. In the ROI Tool, click Delete to delete the selected ROI.
7. From the ROI Tool dialog menu bar, select File > Restore ROIs. An Enter ROI Filenames
dialog appears.
8. Navigate to Data/c95avsub and select cup95_av.roi. Click Open. This file contains
previously defined ROIs for known areas of specific minerals. The ROIs are listed in an ENVI
message dialog and loaded into the ROI Tool dialog as shown in the following figure:
3
9. In the ROI Tool dialog, select the Off radio button to enable pixel positioning in the display group.
10. From the Display group menu bar, select Tools > Profiles > Z Profile (Spectrum).
11. Move the crosshairs in the Zoom window to a pixel inside of an ROI.
المرجع
http://www.ittvis.com/portals/0/tuto...l_Analysis.pdf
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