Putting visual marker in an image
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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 comentarios
Walter Roberson
el 20 de Mzo. de 2013
My interpretation is that the marker needs to be written into the image.
Image Analyst
el 20 de Mzo. de 2013
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.
Respuestas (2)
Image Analyst
el 20 de Mzo. de 2013
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);
6 comentarios
Image Analyst
el 12 de Jun. de 2018
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.
Youssef Khmou
el 20 de Mzo. de 2013
Editada: Youssef Khmou
el 20 de Mzo. de 2013
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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