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issue with imshow ploting
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I am trying to plot/show an image with the certain parameters, but it doesn't show. Only the contour. Does anyone know how I can resolve my image to be shown the the parameters and contour? Thanks in advance
imshow(image,'Border','tight','InitialMagnification',100)
colormap(gray)
hold on
contour(phi,[0 0],'r')
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Answers (2)
Brian B
on 4 Mar 2013
It is probably a scaling issue. What are the sizes of image and phi?
9 Comments
Brian B
on 4 Mar 2013
Edited: Brian B
on 4 Mar 2013
By default, imshow expects values between 0 and 1. You can normalize your matrix, or you can explicitly tell it what range to map to the coloraxis (using 'DisplayRange' or the bracket notation above, but with the min and max values as in [-7 255]), or you can tell it to map the whole range by passing in the empty brackets as I did above.
Image Analyst
on 4 Mar 2013
It's not clear if you meant
min(image(:)) = 7
or
min(image(:)) = -7
But either way you can do
imshow(yourImage, []);
It's also a bad idea to call your image "image" because it would blow away the built in image() function. I hope you didn't do that.
1 Comment
Brian B
on 4 Mar 2013
True! I read it so quickly I didn't even notice the missing "=".
On the same note, as a control engineer I am always appalled when examples in the MATLAB documentation assign the output of a function testing some true or false condition to a variable named tf! Where are your transfer functions, now?
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