hi all, i'm Trying to use bwboundaries function to draw a boundary line around two object in binary image, but it applies only on the big one. how do i apply it on BOTH?

here's the code:

boundary2=bwboundaries(final);

cell_test = boundary2{1,1};

% plot and show boundary

figure(1);subplot(3,3,9), imshow(final); title('boundary2');

hold on; plot(cell_test(:,2),cell_test(:,1),'r','LineWidth',2); hold off;

as you can see, the boundary line circles only the left object, but not the right.

how do i apply this function on multpile object?

thanks all!

Answer 1

[Simon Chan]

Modify as follows:

boundary2=bwboundaries(final); 
% plot and show boundary
figure(1);subplot(3,3,9), imshow(final); title('boundary2');
hold on; 
cell_test = boundary2{1,1};
plot(cell_test(:,2),cell_test(:,1),'r','LineWidth',2); 
cell_test2 = boundary2{2,1};                                % Add the 2nd one
plot(cell_test2(:,2),cell_test2(:,1),'b','LineWidth',2); 
hold off;