MATLAB: Finding the co-ordinates

image processing

I have a matrix as 
S=[0 0 0 0 0 0 0  0 0 0 0
0 0 0 1 1 1 1 0 0 0 0
0 0 0 1 1 1 1 0 0 0 0
0 0 0 1 1 1 1 0 0 0 0
0 0 0 1 1 1 1 0 0 0 0
0 0 0 1 1 1 1 0 0 0 0]
in this i want to find the position of ones so that i can draw the bounding box over ones please help how to processs

Best Answer

st = regionprops(S, 'BoundingBox' )

eg:

z = randi(15,size(S))
ij = ceil(st.BoundingBox);
out = z(ij(2) + (0:ij(4)-1),ij(1) + (0:ij(3)-1))

added after the Kash's comment

Img = imread('Q8vjJ.png');
BW = im2bw(Img,graythresh(Img));
BW(:,1) = false;
BW2 = cumsum(BW,2) & fliplr(cumsum(BW(:,end:-1:1),2));
BW2 =  cumsum(BW2) & flipud(cumsum(BW2(end:-1:1,:)));
st = regionprops(SBW2, 'BoundingBox' );
imcrop(Img,st.BoundingBox + [-1 -1 1 1]);

Related Solutions

MATLAB: How to get a border/boundary around the hand as shown in the figure

You can use the below command with properties as 'BoundingBox'

stats = regionprops(BW,properties)

https://in.mathworks.com/help/images/ref/regionprops.html

MATLAB: Serious problem with “createMask” function.

Here is some code illustrating how to use bwboundaries to get X-Y polygon vertices that work better for mask creation via createMask or poly2mask (which createMask calls). The idea is to get a polygon that includes the centers of the desired mask pixels inside the polygon instead of along its edges. First, here is your code with some graphics to show the area of each pixel and to show the output of bwboundaries going through pixel centers.

BW = [0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
     0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
     0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
     0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
     0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
     0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
     0 0 0 0 0 1 1 1 1 1 1 1 1 1 0 0 0 0 
     0 0 0 0 0 1 1 1 1 1 1 1 1 1 0 0 0 0 
     0 0 0 0 0 1 1 1 1 1 1 1 1 1 0 0 0 0 
     0 0 0 0 0 1 1 1 1 1 1 1 1 1 0 0 0 0 
     0 0 0 0 0 1 1 1 1 1 1 1 1 1 0 0 0 0 
     0 0 0 0 0 1 1 1 1 1 1 1 1 1 0 0 0 0 
     0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
     0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
     0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
     0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
     0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
     0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0];
   B = bwboundaries(BW);
   b = B{1};
   imshow(BW,'InitialMagnification','fit');
   hold on
   [M,N] = size(BW);
   x = [0.5 (N+0.5)];
   for k = 1.5:(M-0.5)
       y = [k k];
       plot(x,y,'Color',[.7 .7 .7],'LineStyle','--');
   end
   y = [0.5 (M+0.5)];
   for k = 1.5:(N-0.5)
       x = [k k];
       plot(x,y,'Color',[.7 .7 .7],'LineStyle','--');
   end
   plot(b(:,2),b(:,1),'r')
   hold off

And here is modified code that produces X-Y values that do not go directly through pixel centers.

 BW3 = imresize(Z,3,'nearest');
 B3 = bwboundaries(BW3);
 b3 = B3{1};
 b3 = (b3 + 1)/3;
 imshow(BW,'InitialMagnification','fit');
 hold on
 [M,N] = size(BW);
 x = [0.5 (N+0.5)];
 for k = 1.5:(M-0.5)
     y = [k k];
     plot(x,y,'Color',[.7 .7 .7],'LineStyle','--');
 end
 y = [0.5 (M+0.5)];
 for k = 1.5:(N-0.5)
     x = [k k];
     plot(x,y,'Color',[.7 .7 .7],'LineStyle','--');
 end
 plot(b3(:,2),b3(:,1),'r')
 hold off

Best Answer

Related Solutions

MATLAB: How to get a border/boundary around the hand as shown in the figure

MATLAB: Serious problem with “createMask” function.

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