Combining plot, line, text2string with getframe

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Malte Römer-Stumm 2022-4-13

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https://ww2.mathworks.cn/matlabcentral/answers/1695700-combining-plot-line-text2string-with-getframe

评论： Malte Römer-Stumm 2022-4-13

Hi,

I have an image stack, in which I would like to plot data points, label the data points and draw a trajectory as a line. To do so I loop through the images of the stack, use imshow to show an image, use plot to create the data points, use line to draw some lines, use inserttext to add the labels and then try to get the whole image with getframe. Before adding the inserttext command, it was working fine, but now I only get a white image containing the inserted text. The code does not create an error. I think I need to store the information from inserttext differently, but I don't know how. Below is the code:

v = VideoWriter('C:\Users\mrst\Desktop\Auswertungen mit Skript\test1 218\Stack\218 bearbeitet tracks.tif','Uncompressed AVI');

open(v);

for n=1:numberOfImages %loops through images in stack

clear text

clear temp

clear pos

close all

f1=figure;

set(f1, 'Visible', 'off');

imshow(stack(:,:,n),[0 255]) %stack is the image stack

axis on

hold on;

c = 1;

for m=1:length(X(:,1,2)) %determines which data points and lines should be plotted

if find(X(m,:,2)==n) > 0

temp(c)=m; %#ok<SAGROW>

c = c+1;

end

plot(nonzeros(X(temp,n,1)),nonzeros(Y(temp,n,1)), 'r+', 'MarkerSize', 3, 'LineWidth', 0.1); %plots data points

for o=1:length(temp) %creates variables for content and position of label

text{o}=sprintf('%4.0f',temp(o)); %#ok<SAGROW>

pos(o,:)=[imported_array(bubble_tracks(temp(o),n,1),8) + 10, imported_array(bubble_tracks(temp(o),n,1),9) + 10]; %#ok<SAGROW> stores position for text

end

for m=1:length(temp) %plots chosen lines

line(nonzeros(X(temp(m),:,1)),nonzeros(Y(temp(m),:,1)),'color',bubble_tracks(temp(m),1:3,3))

end

dummy=insertText(stack(:,:,n),pos,text,'FontSize',18); %inserts text --> I think the problem lies here or in the next line

imshow(dummy)

frame(n)=getframe(gcf); %#ok<SAGROW>

hold off

close(gcf)

end

writeVideo(v,frame);

close(v);

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Malte Römer-Stumm 2022-4-13

Ok so to my understanding the problem is using imshow twice. By using inserttext on the stack first and then using imshow only once, the problem could be solved.

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