How do I Plot images in two different figures

In this snippet below, I want subplot 1 and 2 as a part of the same figure, which is something I am to get. I need a separate plot figure of the "%Separate side figure". I am not able to obtain that. Can you please help me out here?

Also, if I comment pause(0.000000001), my plot doesn't show up. Do you guys know why?

Thanks!

for i = 1 : length(srcFilesKinect)

      axis off
      filenameBL = strcat( path,'sk_left_rgb/',srcFilesBL(i).name);
      I = imread(filenameBL); axis off
      subplot(3,2,1), subimage(I)                           % Subplot 1
      title( 'left')

      filenameBR = strcat( path,'sk_right_rgb/',srcFilesBR(i).name);
      I = imread(filenameBR);  axis off
      subplot(3,2,2), subimage(I)                           %Subplot 2
      title('right')

      filenameKinect = strcat( path2,srcFilesKinect(i).name);
      I = imread(filenameKinect);                           %Separate side figure
      %imshow(I);
      %subplot(3,2,3), subimage(I)
      image(I)
      title('Demo')

      fprintf('Reading %d th image\n',i)

      pause(0.000000001)
  end

[Jan]

Do not use "path" as the name of a variable, because this shadows an important Matlab function. This can cause a very strange behavior during debugging.

Prefer fullfile instead of strcat to concatenate file names, because it cares about the separators.

[Emmanuel]

Okay. Thank you for the suggestion

Answer 1

[Adam]

doc figure

Just create a figure explicitly (which you should always do anyway unless you are plotting on a GUI you have created), get its axes explicitly and plot on them explicitly. e.g.

hFig = figure; hAxes = gca;
imshow( hAxes, I );

[Emmanuel]

Hey! Thanks I am getting this error:

Error using images.internal.imageDisplayParsePVPairs (line 125)
Invalid input arguments.

Error in images.internal.imageDisplayParseInputs (line 69)
[common_args,specific_args] = images.internal.imageDisplayParsePVPairs(varargin{:});

Error in imshow (line 223)
  [common_args,specific_args] = ...

Error in dataSequenceEdit (line 63)
            imshow( hAxes, I );

Do you know why?

[Adam]

Ah, sorry, I didn't check and thought all plotting functions had this syntax now - I never use imshow myself. Apparently imshow is still archaic so you need to use

imshow( I, 'Parent', hAxes );

Answer 2

[Jan]

The pause is required to allow Matlab to update the graphics. The minimal delay is 0.01, so pause(0.000000001) does the same as pause(0.01). I'd prefer drawnow for the updating, but both work reliably.

subimage is deprecated, prefer imshow.

Do not use "path" as the name of a variable, because this shadows an important Matlab function. This can cause a very strange behavior during debugging. I've renamed to to "path1".

Prefer fullfile instead of strcat to concatenate file names, because it cares about the separators.

Then:

Axes1H = subplot(3,2,1);
title('left');

Axes2H = subplot(3,2,2);
title('right');

Fig2H  = figure;
Axes3H = axes;
title('Demo');

for i = 1 : length(srcFilesKinect)
    filenameBL = fullfile(path1, 'sk_left_rgb', srcFilesBL(i).name);
    I = imread(filenameBL);
    imshow(I, 'Parent', Axes1H);
    axis off

      filenameBR = fullfile(path1, 'sk_right_rgb', srcFilesBR(i).name);
      I = imread(filenameBR);
      imshow(I, 'Parent', Axes2H)
      axis off

      filenameKinect = fullfile(path2, srcFilesKinect(i).name);
      I = imread(filenameKinect);
      imshow(I, 'Parent', Axes3H);
      axis off

      fprintf('Reading %d th image\n', i);
      drawnow;
  end

There will be better names than the counted "Axes1H", something more meaningful. Indices inside names of variables are a bad idea.

[Emmanuel]

Thank you! I am getting this error though:

Error using imshow>validateParent (line 348)
HAX must be a valid axes handle.

Error in imshow (line 253)
      validateParent(specific_args.Parent)

Error in dataSequenceEdit (line 62)
            imshow(I, 'Parent', Axes3H);

Do you know why?

[Jan]

After

Fig2H  = figure;
Axes3H = axes;

Axes3H is a valid axes handle. It can only get invalid, if this axes is deleted, e.g. by clf or a similar command, or if its figure is deleted.