How to select rectangle ROI in the image and adjust the position of ROI manually. Then it can return the adjusted ROI position

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chihyu
chihyu 2021-9-11
评论： Matt J 2021-9-18
I can generate roi using images.roi.Rectangle function, but it is easy to be time-consuming during the adjustment process.
Is there any way to write that allows me to manually adjust the roi size and position in the image, and return the pixel value of the roi adjusted position
close all
I = imread('rice.png'); % your input image
figure, imshow(I);
roi = images.roi.Rectangle(gca,'Position',[80,45,80,100]);

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Matt J
Matt J 2021-9-11
编辑：Matt J 2021-9-11
h=drawrectangle();
wait(h);
You must double-click on the rectangle to confirm its position and return control to Matlab.
  2 个评论
chihyu
chihyu 2021-9-18
After I follow deer Matt and the URL below, I succeeded. Thanks.
https://ww2.mathworks.cn/matlabcentral/answers/732603-drawrectangle-drawcircle-drawellipse-and-drawpolyon-draw-region-of-interest-at-wrong-position
ROI = drawrectangle('Color', 'r')
x1 = ROI.Position(1);
x2 = x1 + ROI.Position(3) - 1;
y1 = ROI.Position(2);
y2 = y1 + ROI.Position(4) - 1;
caption = sprintf('x1 = %.1f, x2 = %.1f, y1 = %.1f, y2 = %.1f',...
x1, x2, y1, y2)
title(caption, 'FontSize', 15)
wait(ROI);
x1 = ROI.Position(1);
x2 = x1 + ROI.Position(3) - 1;
y1 = ROI.Position(2);
y2 = y1 + ROI.Position(4) - 1;
captionNEW = sprintf('x1 = %.1f, x2 = %.1f, y1 = %.1f, y2 = %.1f',...
x1, x2, y1, y2)
title(captionNEW, 'FontSize', 15)

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