Changes between Version 28 and Version 29 of GSoC/2016/Additional_segmentation_algorithms/weekly_report

Timestamp:

May 30, 2016, 7:17:11 PM (8 years ago)

Author:

hao2309

Comment:

--

GSoC/2016/Additional_segmentation_algorithms/weekly_report

@@ -18 +18 @@
 === What did you get done this week? ===
 * Finished A small exercise too get more familiar with basic GRASS codes
-Currently i.segment only provides region-growth algorithm. By modifying the codes in [https://trac.osgeo.org/grass/browser/sandbox/bo/i.segment.gsoc2016/i.segment/parse_args.c parse_args.c] I added three inputs each for the additional two algorithms-- mean-shift and watershed.
+    Currently i.segment only provides region-growth algorithm. By modifying the codes in [https://trac.osgeo.org/grass/browser/sandbox/bo/i.segment.gsoc2016/i.segment/parse_args.c parse_args.c] I added three inputs each for the additional two algorithms-- mean-shift and watershed.
 
 * Reviewed some literature for mean-shift algorithm
@@ -38 +38 @@
 === What did you get done this week? ===
 * Further discussion about the algorithm mechanism (about the edge effect)
+1. Edge effect:the moving window have to be re-size when it near the edge or corner of the full image. Mentor has given the solution:
+{{{
+      # figure out moving window, clip to region if necessary
+      mwrow1 = row - (int)radius
+      mwrow2 = mwrow1 + window_size
+      if (mwrow1 < 0)
+        mwrow1 = 0
+      if (mwrow2 > nrows)
+        mwrow2 = nrows
 
+      
+      mwcol1 = col - (int)radius
+      mwcol2 = mwcol1 + window_size
+      if (mwcol1 < 0)
+        mwcol1 = 0
+      if (mwcol2 > ncols
+}}}
+2. Adaptive bandwidth:
+3. The convergence condition:
 * Got the access for GRASS-addons-svn and [https://trac.osgeo.org/grass/browser/sandbox/bo/i.segment.gsoc2016 sandbox]