Code not displaying major and minor axes over image-CodePudding

I am using the following code:

   majors = cell_props.MajorAxisLength;
   minors = cell_props.MinorAxisLength;
   ctr = cell_props.Centroid;
   theta = cell_props.Orientation;

   imshow(cell_full)
   hold on

   for k = 1:length(measurements)

       xMajor=ctr(k,1)   [-1 1]*(majors(k)/2)*cosd(theta(k));
       yMajor=ctr(k,2)   [-1 1]*(majors(k)/2)*sind(theta(k));

       plot(xMajor,yMajor,'r','LineWidth',2);

       xMinor=ctr(k,1)   [-1 1]*(minors(k)/2)*sind(theta(k));
       yMinor=ctr(k,2) - [-1 1]*(minors(k)/2)*cosd(theta(k));
   
       plot(xMinor,yMinor,'b','LineWidth',2);
   end
   hold off

My image is:

When I try to run the code previously mentioned, for some reason it creates these lines:

I realize I am probably doing something wrong with the math here, but I am not sure what. I have tried converting theta to radians, switching the minor coordinates and major coordinates for the lines. Nothing seems to work.

Any help would be appreciated.

CodePudding user response：

As Christoph pointed out in his comment, the axes ought to be reflected vertically. This means the positive direction of orientation angle is wrong. A negative sign in front of theta(k) should fix it.

xMajor=ctr(k,1)   [-1 1]*(majors(k)/2)*cosd(-theta(k));