How to save an image with plotted lines and annotations

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Jed 2014-3-19

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评论： Jed 2014-4-8

Hi, i am doing a batch processing task and for each image i will get a thresholded image with lines plotted ontop showing the initial point of spray and final point of spray and a value for the length of spray. However, i am needing to save all of this to one file like the image below. My matlab knowledge is depressingly basic. I was trying to use the imwrite function below as this will allow me to put all the processed images in the same folder, however, i do not know how to add the plotted lines and annotations to the thresholded image.Does anyone know how to do this? Thank you in advance!

% plot thresholded image

imagesc(BWpen);axis image; hold on;

% plot max penetration onto BWpen

plot(result(:,1),result(:,2),'r-.')

[And the line for nozzle exit]

% annotate with length of penetration

text(InjectorX-60,InjectorY-30,...
sprintf('%1.3f',meani)],'color','b','FontSize',14,'FontWeight','bold');

% attempt to write into folder

imwrite([BWpen], ['cropped\' filelist(k).name]);

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Jed 2014-3-19

And sorry, secondly, how could i write the values of the maximum penetration for each image into a file so that i could later draw graphs from them? [where the value for maximum penetration is given by 'meani'.in the above code] Thank yoooouu!!

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采纳的回答

Image Analyst 2014-3-19

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export_fig() (the most downloaded MATLAB app of all time) is probably the most common way. See the FAQ: http://matlab.wikia.com/wiki/FAQ#How_do_I_save_my_figure.2C_axes.2C_or_image.3F_I.27m_having_trouble_with_the_built_in_MATLAB_functions.

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Image Analyst 2014-3-20

在 MATLAB Online 中打开

Yes. Below is a snippet from a pulldown menu where I allow the user to save a screenshot of their GUI at that point in time:

% --------------------------------------------------------------------
function mnuFileSaveScreenshot_Callback(hObject, eventdata, handles)
% hObject    handle to mnuFileSaveScreenshot (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
% --------------------------------------------------------------------
  try
    filterSpec = '*.*';
    defaultName = sprintf('%s\\Screenshot.png', handles.calibrationFolder);
    dialogTitle = 'Save Screenshot?';
    [baseFileName, folder] = uiputfile(filterSpec, dialogTitle, defaultName);
    if baseFileName == 0
      % User clicked cancel.
      return; % Bail out.
    end
    fullFileName = fullfile(folder, baseFileName);
    message = sprintf('Please wait...\n\nSaving screenshot image as:\n%s', fullFileName);
    set(handles.txtInfo, 'String', message);
    drawnow;  % Needed to get it to refresh.
    export_fig(fullFileName, handles.figMainWindow);
    message = sprintf('Done!\n\nScreenshot image saved as:\n%s', fullFileName);
    set(handles.txtInfo, 'String', message);
    msgboxw(message);
  %   close(hFigure);
  catch ME
    message = sprintf('Error in mnuFileSaveScreenshot_Callback():\n%s', ME.message);
    WarnUser(message);
  end
  return; % from mnuFileSaveScreenshot_Callback

Image Analyst 2014-4-8

I don't know. I've just used it for capturing screenshots of the entire figure, not of just one axes on the figure. I'd try to contact Oliver Woodford, who wrote export_fig. Worst case, read it in, crop it (hopefully it's the same size every time) and re-save it.

Jed 2014-4-8