Improve image quality, grainy words

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alessandro mutasci
alessandro mutasci 2021-10-18
评论： Rik 2021-10-18
Good morning, I'm using this script to obtain a sequences of image. The problem is that the quality of the written part, or more in general of the final image is poor. If I try to zoom the image, it is all grainy. Is there a way to improve it? I attach the script I use and an example of image I obtain.
path='C:\Users\Utente\Desktop\xtreno\imm\New Folder1';
Dir=dir(path);
c=figure('Visible','off');
h1=subplot(1,2,1)
annotation(c,'line',[0.733928571428571 0.7875],[0.4 0.4],'Color',[1 0 0],'LineWidth',1);
annotation(c,'textbox',[0.779571428571429 0.354761904761906 0.131142857142857 0.107142857142858],'String',{'PROBE'},'FontSize',12,...
'FitBoxToText','off',...
'EdgeColor','none');
for i=1:17
h1=subplot(1,2,1)
hold on
plot(t1(1:i),s11(1:i),'Marker','x','LineStyle','--') %s1t1 camera, s3tefibra
if i<1
plot(t2(1:i),s3(1:i),'LineWidth',2)
else
plot(t2(1:i*10-7),s3(1:i*10-7),'LineWidth',2)
end
line([t1(i) t1(i)],[-2 2],'Color',[0 0 0]);
ylabel({'Phase (-)'},'FontName','Times New Roman');
xlabel({'t (s)'},'FontAngle','italic','FontName','Times New Roman');
legend1 = legend({'Camera','Fibre'});
h2=subplot(1,2,2)
I=imread([path,'/',Dir(2+i).name]);
imshow(I);
box(h1,'on');
h1.Position=[0.13 0.135714285714286 0.5075 0.789285714285715];
set(h1,'FontSize',10,'LineWidth',1.5,'XGrid','off','YTick',[0.2 0.9],'YTickLabel',{'Liq', 'Vap'},'XLim',[t1(i)-0.2,t1(i)+0.05],'XLimMode','Manual','YLim',[-0.2,1.2],'YLimMode','Manual');
F = getframe(c);
F1(:,:,:,i) = F.cdata;
imwrite(F1(:,:,:,i), sprintf('frame%d.png', i));
end
  2 个评论
Rik
Rik 2021-10-18
Your image is apparently fairly small. You can either increase the size of your figure, or use a different function that allows you to set the resolution (like @yanqi liu suggested).
alessandro mutasci
alessandro mutasci 2021-10-18
yes you are right, I tried the function that @yanqi liu suggested, but it's still grainy. Could you tell me how to increse the size of my figure please?

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回答（1 个）

yanqi liu
yanqi liu 2021-10-18
sir，please use
print(gcf,'-dpng','-r200','your_image_name')
  3 个评论
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alessandro mutasci
alessandro mutasci 2021-10-18
yes, using an higer DPI, it is going ok. but now I'm trying to use it for all images but it's not working. it says that there are multiple error, but I'm not understanding how to solve it.
for i=1:16
I=sprintf('frame%d.png',i)
print(I,'-dpng','-r1000','your_image_name%d')
end
Rik
Rik 2021-10-18
You received an error. Now it is time to read the documentation of that function. You didn't do that yet, but you should.

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