Rotate an object based on regionprops Orientation, MinFeret and MaxFeret angles
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Asi
am 17 Okt. 2023
Kommentiert: Walter Roberson
am 18 Okt. 2023
How can I rotate an object based on regionprops Orientation, MinFeret and MaxFeret angles?
My aim is that the object and the regionprops based plotted lines will be 0 or 90 degrees.
Thanks.
Code:
close all;
clear;
clc;
I = (insertText(zeros(150,150),[0 0],'B','BoxOpacity',0,'FontSize',70,'TextColor','w'));
I = imrotate(I,15);
I = rgb2gray(I);
figure('Name','Img');
imshow(I);
I=flipud(I);
BW = imbinarize(I);
[B,L] = bwboundaries(BW,'noholes');
k=1;
st = regionprops(I,"Centroid","MajorAxisLength","Orientation","MinFeretProperties","MaxFeretProperties");
b = B{k};
c = st(k).Centroid;
yBoundary = b(:,2);
xBoundary = b(:,1);
cy = c(:,2);
cx = c(:,1);
figure('Name','Boundary and lines');
plot(yBoundary, xBoundary, 'black', 'linewidth', 2);
hlen = st.MajorAxisLength/2;
xCentre = st.Centroid(1);
yCentre = st.Centroid(2);
cosOrient = cosd(st.Orientation);
sinOrient = sind(st.Orientation);
xcoords = xCentre + hlen * [cosOrient -cosOrient];
ycoords = yCentre + hlen * [-sinOrient sinOrient];
line(xcoords, ycoords, 'Color','red');
line([st.MaxFeretCoordinates(1),st.MaxFeretCoordinates(2)],[st.MaxFeretCoordinates(3),st.MaxFeretCoordinates(4)],'Color','blue');
line([st.MinFeretCoordinates(1),st.MinFeretCoordinates(2)],[st.MinFeretCoordinates(3),st.MinFeretCoordinates(4)],'Color','green');
orientationRotImg = imrotate(I, st.Orientation-90);
figure('Name','orientationRotImg');
imshow(orientationRotImg)
MaxFeretAngleRotImg = imrotate(I, st.MaxFeretAngle-90);
figure('Name','MaxFeretAngleRotImg');
imshow(MaxFeretAngleRotImg)
MinFeretAngleRotImg = imrotate(I, st.MinFeretAngle-90);
figure('Name','MaxFeretAngleRotImg');
imshow(MinFeretAngleRotImg)
3 Kommentare
Walter Roberson
am 18 Okt. 2023
The min ferret angle and max ferret angle are not typically going to be 90 degrees from each other, so requiring that both be rotated to horizontal or vertical is not typically going to work.
Akzeptierte Antwort
Walter Roberson
am 17 Okt. 2023
Verschoben: Matt J
am 17 Okt. 2023
close all;
clear;
clc;
I = (insertText(zeros(150,150),[0 0],'B','BoxOpacity',0,'FontSize',70,'TextColor','w'));
I = imrotate(I,15);
I = rgb2gray(I);
figure('Name','Img');
imshow(I);
I=flipud(I);
BW = imbinarize(I);
[B,L] = bwboundaries(BW,'noholes');
k=1;
st = regionprops(I,"Centroid","MajorAxisLength","Orientation","MinFeretProperties","MaxFeretProperties");
MinFeretAngleRotImg = imrotate(I, st.MinFeretAngle);
figure('Name','MaxFeretAngleRotImg');
imshow(MinFeretAngleRotImg)
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