Putting visual marker in an image

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Con
Con 2013-3-20
评论： khalid jackson 2018-6-12
I'd like to be able to simply mark a point on an image using a crosshair or something similar. It's not a plot I'm using, I want to be able to overlay the marker on the actual image at a particular point.
  2 个评论
Walter Roberson
Walter Roberson 2013-3-20
My interpretation is that the marker needs to be written into the image.
Image Analyst
Image Analyst 2013-3-20
Please clarify if you want the cross mark in the overlay (above the image) or if you want it actually written into the image pixels themselves.

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回答（2 个）

Image Analyst
Image Analyst 2013-3-20
Try this:
grayImage = imread('moon.tif');
imshow(grayImage);
uiwait(msgbox('Locate the point'));
[x,y] = ginput(1);
hold on; % Prevent image from being blown away.
plot(x,y,'r+', 'MarkerSize', 50);
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Image Analyst
Image Analyst 2018-6-12
No. If you show another image, it blows away whatever was in the axes. So you have to put "hold on" and then call plot() to place your points into the overlay above the image again.
You might look into imoverlay() - not sure if that will keep the overlay points since I haven't tried it.

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Youssef Khmou
Youssef Khmou 2013-3-20
编辑：Youssef Khmou 2013-3-20
hi Con
You can use 'gtext', and put the dot in a position you want , example :
X=imread('circuit.tif');
imshow(X), gtext('*')
You can also make many text strings using the same function :
X=imread('circuit.tif');
figure,imshow(X), gtext({'My point1';'My mpoint2';'My point3'})

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