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POMATLAB - How to plot x,y on an image and save?
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copied!<h3>File datafile.txt</h3> <pre><code>code x y 23 22.1 33.11 23 110 22 23 11 200 24 111 321 24 222 111 24 10 22.1 10 88.3 99.3 10 110 32 10 121 143 10 190 200 </code></pre> <p>In the above file, the first column represents the image code which is displayed on the screen, and the x and y columns represent the point where people look on the image. There were three different images displayed to the user. The problem with the code below is that I don't know how to save the image with the plotted x-y on with the same name of file as it opened.</p> <pre><code>fid = fopen(datafile.txt); A = textscan(fid,'%f%f%f'); %Read data from the file code = A{1}; xfix = A{2}; yfix = A{3}; for k=1:length(code) imagefile=code(k) I = imread([num2str(imagefile) '.jpg']); %# Load a sample image imshow(I); %# Display it [r,c,d] = size(I) %# Get the image size set(gca,'Units','normalized','Position',[0 0 1 1]); %# Modify axes size set(gcf,'Units','pixels','Position',[200 200 c r]); %# Modify figure size hold on; x = xfix2(k); y = yfix2(k); plot(x,y,'+ b'); f = getframe(gcf); %# Capture the current window imwrite(f.cdata,([num2str(imagefile) '.jpg'])); %# Save the frame data hold off end </code></pre> <p><img src="https://i.stack.imgur.com/EyKOO.jpg" alt="Enter image description here"></p> <p>However, I have a little problem. The "cross plots" which I overlay on the image, were surrounded by gray shadow (like when we photocopy a paper, they will be a gray color on it). How did this happen?</p>

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