plotted image has low quality

When I tried to plot on my image and show on UIAxes, the image quality reduced significantly. It also takes too much time. However in .mlx file everything is normal.

In app Designer:

In .mlx file

Code :

s= regionprops(...)
hold on


for i =1:numel(s)
    feret_diameter = s(i).MaxFeretDiameter;
    if feret_diameter < 350
        feret_coords = s(i).MaxFeretCoordinates;
        plot(feret_coords(:, 1), feret_coords(:, 2), 'r', 'LineWidth', 2);

        angle = atan2d(feret_coords(2, 2) - feret_coords(1, 2), feret_coords(2, 1) - feret_coords(1, 1));
         
        mid_point = mean(feret_coords, 1) ;
        offset_point = (mid_point + [feret_coords(2,1)  feret_coords(2,2)])*0.5;

        length = sqrt((feret_coords(2, 2) - feret_coords(1, 2))^2 + (feret_coords(2, 1) - feret_coords(1, 1))^2);

        
        offset = length * 0.05;
        text_position = [offset_point(1) - offset * sind(angle), offset_point(2) - offset * cosd(angle)];
        
        text(text_position(1), text_position(2), sprintf('%.2f', feret_diameter), 'FontSize', 8, 'Rotation', -angle+180);

    end
    
end
frame = getframe(gca);
captured_image = frame.cdata;
hold off

text(...) function also gives error like: Index in position 1 is invalid. Array indices must be positive integers or logical values.

I also used

frame = getframe(gca);
captured_image = frame.cdata;

to get quality image but it didn't help.

I need faster solution and quality image output.

Thanks for your help.

[dpb]

Well, at least attach the image file...nothing to be done without it and the stucture s

[Walter Roberson]

text(...) function also gives error like: Index in position 1 is invalid

You accidentally created a variable named text at some point.

[DGM]

These two images were generated with the exact same code, but with different figure geometry.

Given that the relative sizes of the lines and image objects is dependent on the figure/axes geometry, then I'm going to assume that your problem stems from plotting the image in a small axes. That's just my guess. That said, we have no idea how you plotted the image or did axes setup in either case.

It's also not clear how you're capturing titles and labels using getframe() on the axes and not on the figure.