draw oriented rectangle around a blob
显示 更早的评论
function y=cadre(x)
info = regionprops(x,'Boundingbox') ;
imshow(x)
hold on
for k = 1 : length(info)
BB = info(k).BoundingBox;
rectangle('Position', [BB(1),BB(2),BB(3),BB(4)],'EdgeColor','g','LineWidth',1) ;
end
I am using this code with a segmented image in input, and I have this result :
input output 
I would like the rectangles to be the smallest and with the same orientation as the objects, to get the angles for exemple.
How can I modify my code ?
采纳的回答
Something like this seems to work:
img = imread('testimage.jpg');
bw = imbinarize(im2gray(img),'adaptive','Sensitivity',0.45);
info = regionprops(bw, 'all');
imshow(img);
hold on;
minSize = 50; % ignore small/noise regions (adjust as necessary)
angles = [];
for k = 1:length(info)
% get region properties
w = info(k).MajorAxisLength;
h = info(k).MinorAxisLength;
x = info(k).Centroid(1) - w/2;
y = info(k).Centroid(2) - h/2;
theta = info(k).Orientation;
if h < minSize % skip the small/noise regions
continue;
end
angles = [angles theta];
ps = polyshape([x, x, x+w, x+w], [y, y+h, y+h, y]);
ps2 = rotate(ps, -theta, [x+w/2 y+h/2]);
plot(ps2, 'EdgeColor','r', 'FaceColor','none', 'LineWidth',2);
end
angles
1 个评论
Image Analyst
2022-3-27
OK but note that the boxes don't completely contain the blobs.
更多回答（2 个）
Image Analyst
2022-3-26
1 个投票
See John D'Errico's suite of bounding shapes:
Walter Roberson
2022-3-26
编辑：Walter Roberson
2022-3-26
0 个投票
Note that if you are looking for the angles then regionprops() 'Orientation' will give you the angle of the major axes.
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