How can I measure how many indentation or foldings are present in the three objects presented below?
http://s20.postimage.org/s1zoc1r8t/indent.png
Hi,
Maybe you can perform an analisys over the "Shape signature" like here http://basic-eng.blogspot.com.es/2006/01/signature-of-binary-objects.html
Once you have the signature, you can characterize each object (signature) and identify it by training a classifier as ANN or something like this.
If there are many features, they can be reduced using a PCA
Good luck
Approach 1:
Find the difference between binary image and its convex hull & apply morphology to remove small regions & count the remaining no. of indents or foldings
____________________________________________________
%% Matlab program to check indents or foldings in binary image
clc;close all; clear all; warning off;
I=imread('indent.png');
BW=im2bw(I);
BW=imclearborder(BW);
figure,imshowpair(I,BW,'montage');
BW_convhull=bwconvhull(BW,'objects');
indent=xor(BW,BW_convhull);
figure,imshowpair(BW_convhull,indent,'montage')
indent_final=bwareaopen(indent,100); % remove small regions
figure,imshowpair(I,indent_final,'montage');
L=labelmatrix(bwconncomp(BW_convhull));
s=regionprops(L,'BoundingBox');
L1=bwlabel(imcrop(indent_final,s(1).BoundingBox));
L2=bwlabel(imcrop(indent_final,s(2).BoundingBox));
L3=bwlabel(imcrop(indent_final,s(3).BoundingBox));
disp('No. of indents in three objects respectively are:')
disp([max(L1(:)),max(L2(:)),max(L3(:))]);
_____________________________________________________
Result
No. of indents in three objects respectively are:
2 1 1
Approach 2:
Check http://syntacticsalt.com/2013/01/11/finding-dents-in-an-blobby-shape/
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