Problem with rotating an image

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Ely Raz
Ely Raz 2023-11-21
评论： Image Analyst 2023-11-22
Hi,
I have a code within app designer which is aim in rotating an object but I get sometimes this error:
c
=
1.0e+03 *
1.0595 1.0271
Intermediate dot '.' indexing produced a comma-separated list with 2 values, but it must produce a single value
when followed by subsequent indexing operations.
Error in RotateV/ManualrotateButtonPushed (line 765)
xCentre = stat.Centroid(1);
Error in matlab.apps.AppBase>@(source,event)executeCallback(ams,app,callback,requiresEventData,event) (line 62)
newCallback = @(source, event)executeCallback(ams, ...
Related documentation
Error while evaluating Button PrivateButtonPushedFcn.
The relevant code is:
[B,L] = bwboundaries(app.Iworking,'noholes');
k=1;
stat = regionprops(L,"Centroid","MajorAxisLength","Orientation","MinFeretProperties","MaxFeretProperties");
b = B{k};
c = stat(k).Centroid;
app.yBoundary = b(:,2);
app.xBoundary = b(:,1);
cy = c(:,2);
cx = c(:,1);
app.IManualAngleRotImg = imrotate(app.Iworking, app.rotateEditField.Value);
[B,L] = bwboundaries(app.IManualAngleRotImg,'noholes');
k=1;
stat = regionprops(L,"Centroid","MajorAxisLength","Orientation","MinFeretProperties","MaxFeretProperties");
b = B{k};
c = stat(k).Centroid
app.yBoundary = b(:,2);
app.xBoundary = b(:,1);
cy = c(:,2);
cx = c(:,1);
imshow(app.IManualAngleRotImg,'Parent', app.objectRotateEditorAxes)
hold(app.objectEditorAxes,'on');
plot(app.objectRotateEditorAxes, app.yBoundary, app.xBoundary, 'red', 'linewidth', 2);
hlen = stat.MajorAxisLength;
xCentre = stat.Centroid(1);
yCentre = stat.Centroid(2);
Any idea how can I solve it? is it related to the "1.0e+03 *" outcome, Can someone help?
Thanks a lot

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回答（1 个）

Image Analyst
Image Analyst 2023-11-21
stat is a structure array, not a single structure.
Try this
xy = vertcat(stat.Centroid); % Get all N blobs centroids into an N by 2 array with x=column1 and y=column2.
cx = xy(:, 1); % Or xCenter = xy(:, 1);
cy = xy(:, 2); % Or yCenter = xy(:, 2);
  2 个评论
Ely Raz
Ely Raz 2023-11-22
Hi,
Thanks.
I was applying your comments and also fixed the Orientation issue. I think the structure array issue is repetitive in all the script as I get this error with this line
line(app.objectRotateEditorAxes, [stat.MaxFeretCoordinates(1),stat.MaxFeretCoordinates(2)],[stat.MaxFeretCoordinates(3),stat.MaxFeretCoordinates(4)],'Color','blue','LineWidth',2);
Error using GMRotateVer11/ManualrotateButtonPushed
Intermediate dot '.' indexing produced a comma-separated list with 5 values, but it must produce a single value
when followed by subsequent indexing operations.
Any idea how can I solve this error as I presume it will occur also with MinFeretCoordinates?
Thanks a lot again and I highly appriciate it.
Code:
function ManualrotateButtonPushed(app, event)
[B,L] = bwboundaries(app.Iworking,'noholes');
k=1;
stat = regionprops(L,"Centroid","MajorAxisLength","Orientation","MinFeretProperties","MaxFeretProperties");
b = B{k};
c = stat(k).Centroid;
app.yBoundary = b(:,2);
app.xBoundary = b(:,1);
cy = c(:,2);
cx = c(:,1);
app.IManualAngleRotImg = imrotate(app.Iworking, app.rotateEditField.Value);
[B,L] = bwboundaries(app.IManualAngleRotImg,'noholes');
k=1;
stat = regionprops(L,"Centroid","MajorAxisLength","Orientation","MinFeretProperties","MaxFeretProperties");
b = B{k};
c = stat(k).Centroid;
app.yBoundary = b(:,2);
app.xBoundary = b(:,1);
cy = c(:,2);
cx = c(:,1);
imshow(app.IManualAngleRotImg,'Parent', app.objectRotateEditorAxes)
hold(app.objectEditorAxes,'on');
plot(app.objectRotateEditorAxes, app.yBoundary, app.xBoundary, 'red', 'linewidth', 2);
hlen = stat.MajorAxisLength;
xy = vertcat(stat.Centroid); % Get all N blobs centroids into an N by 2 array with x=column1 and y=column2.
xCentre = xy(:, 1);
yCentre = xy(:, 2);
oriTemp = vertcat(stat.Orientation);
ori = oriTemp(1, 1);
% cosOrient = cosd(stat.Orientation);
% sinOrient = sind(stat.Orientation);
cosOrient = cosd(ori);
sinOrient = sind(ori);
xcoords = xCentre + hlen * [cosOrient -cosOrient];
ycoords = yCentre + hlen * [-sinOrient sinOrient];
line(app.objectRotateEditorAxes, xcoords, ycoords, 'Color','magenta','LineWidth',2);
line(app.objectRotateEditorAxes, [stat.MaxFeretCoordinates(1),stat.MaxFeretCoordinates(2)],[stat.MaxFeretCoordinates(3),stat.MaxFeretCoordinates(4)],'Color','blue','LineWidth',2);
line(app.objectRotateEditorAxes, [stat.MinFeretCoordinates(1),stat.MinFeretCoordinates(2)],[stat.MinFeretCoordinates(3),stat.MinFeretCoordinates(4)],'Color','green','LineWidth',2);
app.orientationAngleLabel.Text = strcat("Orientation angle: ", num2str(stat.Orientation));
app.minFeretangleLabel.Text = strcat("Min. Feret angle: ", num2str(stat.MinFeretAngle));
app.maxFeretangleLabel.Text = strcat("Max. Feret angle: ", num2str(stat.MaxFeretAngle));
app.Iworking = app.IManualAngleRotImg;
app.outline2save = [app.yBoundary app.xBoundary]
%imshow(app.Iworking);
end
Image Analyst
Image Analyst 2023-11-22
Again, stat is a structure ARRAY, not a single structure so you're going to have to give an index. If you want to do it like you're doing, stat would have to be a table. To do that add the 'table' option to regionprops.

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