How to overlay original image with created filled circle?

Question

Ivan Shorokhov 2015-2-17

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/178953-how-to-overlay-original-image-with-created-filled-circle

评论： Ivan Shorokhov 2015-2-18

采纳的回答： Image Analyst

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Dear All,

I have following shape:

And I want to draw a filled circle above it (make a mask for this circle). I have tried following code, but it didn't work as I expected:

close all;clc; clear all;
original=imread('SA_r1.jpg'); % original=imread('u.jpg');
original=imresize(original,[500 500],'bicubic');% simple image interpolation.
bi= im2bw(original); % bi(binary image)
hbw = bwconvhull(bi);
[Clab, ~] = bwlabel(hbw);
st = regionprops(Clab,'Centroid','BoundingBox','Orientation','MajorAxisLength','MinorAxisLength');
figure; imshow(original);   hold on;
xmin=floor(st.BoundingBox(1)); ymin=floor(st.BoundingBox(2));
xmax=floor(st.BoundingBox(1)+st.BoundingBox(3)); ymax=floor(st.BoundingBox(2)+st.BoundingBox(4));
figure; imshow(hbw,[]); hold on; sp_mean=15;
r1=floor(ymin-sp_mean); r2=floor(ymax+sp_mean);c1=floor(xmin-sp_mean);c2=floor(xmax+sp_mean);
rectangle('Position',[xmin-sp_mean, ymin-sp_mean, st.BoundingBox(3)+2*sp_mean, st.BoundingBox(4)+2*sp_mean], 'Curvature',[1,1],'FaceColor','w');
figure; 
original(c1:c2,r1:r2)=rectangle('Position',[xmin-sp_mean, ymin-sp_mean, st.BoundingBox(3)+2*sp_mean, st.BoundingBox(4)+2*sp_mean], 'Curvature',[1,1],'FaceColor','w');
imshow(original); contour(original, [0,0], 'r');