CODEWITHSUNDEEP
imagematlabbinarydraw
Simplicity
Simplicity

Reputation: 48926

Drawing two shapes on one image

This is part of what I have done for drawing a shape on my images:

...
...
k = convhull(x,y);
I=imread('img.png');
imshow(I)
hold on
plot(x(k),y(k),'r-',x,y,'b+');
BW = roipoly(I, x(k), y(k) );

What should I do in order to receive the binary result as in BW, but that contains the other shape (i.e; xx, yy)?

I kept hold on, and was able to plot the second shape, but the issue was how to get the binary result of the two shapes at the image.

EDIT

This is what I did:

I=imread('img.png');
....
....
selectedRegions1=119;
bb = vertcat( rg( selectedRegions1 ).BoundingBox );
bb(:,3:4) = bb(:,1:2) + bb(:,3:4) - 1;
totBB = [min( bb(:,1:2), [], 1 ), max( bb(:,3:4), [], 1 ) ]
nVal=50;
totBB =

  239.5000  202.5000  252.5000  211.5000

xx1 =239.5000 + rand(nVal,1).*(252.5000- 239.5000);
yy1 =   202.5000 + rand(nVal,1).*(211.5000-  202.5000);
k1 = convhull(xx1,yy1);
I=imread('img.png');
imshow(I)
hold on
plot(xx1(k1),yy1(k1),'r-',xx1,yy1,'b+');
fill(xx1(k1),yy1(k1),[1 1 1])
selectedRegions2=[181,186,193,198];
bb = vertcat( rg( selectedRegions2 ).BoundingBox );
bb(:,3:4) = bb(:,1:2) + bb(:,3:4) - 1;
totBB = [min( bb(:,1:2), [], 1 ), max( bb(:,3:4), [], 1 ) ]

totBB =

  355.5000  100.5000  399.5000  146.5000

xx2 =355.5000 + rand(nVal,1).*(399.5000- 355.5000);
yy2 =   100.5000 + rand(nVal,1).*( 146.5000-   100.5000);
k2 = convhull(xx2,yy2);
plot(xx2(k2),yy2(k2),'r-',xx2,yy2,'b+');
fill(xx2(k2),yy2(k2),[1 1 1])
BW = roipoly( I, xx1(k1), yy1(k1) );
BW = roipoly( I, xx2(k2), yy2(k2) );
imshow(BW)

Thanks.

Upvotes: 0

Views: 946

Answers (1)

lennon310
lennon310

Reputation: 12689

The polygon region has already been described by your x(k) and y(k), so there is no more interactive part for you to draw another polygon. imshow(BW) is the same as your previous 3 lines code.

You can save/imwrite the BW and imread it again , then use roipoly to draw your own polygons.

If you draw the polygons all automatically, you can just use:

BW = roipoly( I, xx1(k1), yy1(k1) ); 
BW1 = roipoly( I, xx2(k2), yy2(k2) ); 
imshow(BW|BW1)

Upvotes: 1

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