how to get a good resolution for a binary image from an image, which took through getframe?

Hello everyone,

I have an image, which must be captured from a plot and then resized and converted to a binary image, that's my code:

plot (L(:,1),L(:,2),'k');

axis([min(x) max(x) min(y) max(y)])

drawnow

ax1 = gca;

ax1.YDir = 'normal';

ax1.Units = 'pixels';

pos = ax1.Position;

marg = 5;

rect = [marg, marg, pos(3)-2*marg, pos(4)-2*marg];

F = getframe(gca,rect);

ax1.Units = 'normalized';

[X, Map] = frame2im(F);

Y = imresize (X,[500 500]);

BW = im2bw(Y,Map,0.5);

In fact, I've got a binary image but with very bad resolution, how i can fix that?

Answer 1

[Pruthvi Muppavarapu]

The following answer may help you improve the resolution of the binary image:

https://in.mathworks.com/matlabcentral/answers/94753-why-does-the-getframe-function-in-matlab-produce-movie-frames-of-poor-resolution