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issue with imshow ploting

1 次查看（过去 30 天）
Jerome
Jerome 2013-3-4
关闭： MATLAB Answer Bot 2021-8-20
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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回答（2 个）

Brian B
Brian B 2013-3-4
It is probably a scaling issue. What are the sizes of image and phi?
  9 个评论
显示 7更早的评论
Brian B
Brian B 2013-3-4
编辑：Brian B 2013-3-4
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
Image Analyst 2013-3-4
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 个评论
Brian B
Brian B 2013-3-4
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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