MATLAB: Hi, I am using Matlab version 7.9.0(R2009b). I need to select a rectangular region of interest for the tif image. I tried imrect but the rectangular appeared on an empty coordinat system, not in the tif image. Could you please help me on this

Question

mathworks

Answer 1

Try this:

  txtInfo = sprintf('Draw a box over the image by clicking and dragging over the image.\nDouble click inside the box to finish drawing.');
  text(10, 40, txtInfo, 'color', 'r', 'FontSize', 24);
      % Prompt user to draw a region on the image.
    msgboxw(txtInfo);
    
    hBox = imrect;
    roiPosition = wait(hBox);
    roiPosition % Echo coordinates to the command window.
    % Erase all previous lines.
    if ~enlargeForDrawing
      axes(handleToImage);
  %     ClearLinesFromAxes(handles);
    end
  xCoords = [roiPosition(1), roiPosition(1)+roiPosition(3), roiPosition(1)+roiPosition(3), roiPosition(1), roiPosition(1)];
  yCoords = [roiPosition(2), roiPosition(2), roiPosition(2)+roiPosition(4), roiPosition(2)+roiPosition(4), roiPosition(2)];
  % Plot the mask as an outline over the image.
  hold on;
  plot(xCoords, yCoords, 'linewidth', 2);