Highlighting the contour of a specific region and its lowest end points.

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Anjan Goswami 2020-5-16

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https://ww2.mathworks.cn/matlabcentral/answers/525923-highlighting-the-contour-of-a-specific-region-and-its-lowest-end-points

回答： Anjan Goswami 2020-5-16

I have to plot the contour of an specific area of the attached 'InputImage.png' as shown by green countour in the attached 'sample...png'. I wanted to use bwtraceboundary() but I couldn't manage to determine the row and column coordinates of a pixel on the border. If I sort the biggest area, then is it possible to show the contour of that area?

Also, I have to highlight the two endpoints at the base as shown in the 'sample...png'. How can it be done?

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Answer 1

Anjan Goswami 2020-5-16

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https://ww2.mathworks.cn/matlabcentral/answers/525923-highlighting-the-contour-of-a-specific-region-and-its-lowest-end-points#answer_432862

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I have solved the problem. The code is as below:

crownAndSecondaryDroplet=imread('inputImage.png');
%get the row number of the lowest white pixels
lowestRow = find(sum(crownAndSecondaryDroplet, 2)>0, 1, 'last');  % Bottom white row of the image
hp = impixelinfo(); %to check the output of the lowest row
%find the column numbers of the lowest row
colummsOfLowestRow= find(crownAndSecondaryDroplet(lowestRow,:)==1);
%find the x value for the leftmost and the rightmost pixels of the lowest row
lowestLeftXvalue = min(colummsOfLowestRow);
lowestRightXvalue = max(colummsOfLowestRow);
%get the boundary of the contour
boundary = bwtraceboundary(crownAndSecondaryDroplet,[lowestRow, lowestLeftXvalue],'N'); 
%display the image
figure, imshow(crownAndSecondaryDroplet, []);
title('Image with Rim Contour', 'FontSize', fontSize, 'Interpreter', 'None'); 
axis on;
% Enlarge figure to full screen.
set(gcf, 'Units', 'Normalized', 'OuterPosition', [0 0 1 1]);
hold on;
%plot the contour and lowest end points
plot(boundary(:,2),boundary(:,1),'g','LineWidth',2);
plot(lowestLeftXvalue , lowestRow, 'r+', 'LineWidth', 3, 'MarkerSize', 20 ); 
plot(lowestRightXvalue , lowestRow, 'r+', 'LineWidth', 3, 'MarkerSize', 20 ); 
hold off;