save and loading ROIs

Question

Yong-Ho 2013-8-20

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https://ww2.mathworks.cn/matlabcentral/answers/85141-save-and-loading-rois

I want to save ROIs that selected from a jpg image using imfreehand. And in other jpg image, I want load save ROIs and adjust their position separately. How can I save ROIs and read again?

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Answer 1

Image Analyst 2013-8-20

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https://ww2.mathworks.cn/matlabcentral/answers/85141-save-and-loading-rois#answer_94652

I'd save them into a .mat file with the save() function, and recall with the load() function.

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Matt Kindig 2013-8-20

What doesn't work about this approach? Your r1 should be back in the workspace after you call the load() command.

Image Analyst 2013-8-20

编辑：Image Analyst 2013-8-20

在 MATLAB Online 中打开

Moving the ROI has nothing to do with saving and recalling it. First of all, you can get the (x,y) coordinates like this:

hFH = imfreehand();
% Get the x,y coordinates from the ROI object.
xy = hFH.getPosition;
x = xy(:, 1);
y = xy(:, 2);
plot(x, y, 'r-'); % Draw it over the image.

Next you need to move it. Probably the easiest thing for you to do is to have scrollbars, one vertical and one horizontal. In the vertical scrollbar callback, increment or decrement the y value, and in the horizontal scrollbar callback increment or decrement the x values. See the FAQ: http://matlab.wikia.com/wiki/FAQ#How_can_I_share_data_between_callback_functions_in_my_GUI.28s.29.3F. If you want to get fancier you could use the mousemove callback to drag the ROI around.

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