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finding the exact thrreshold for im2bw

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Mary Kodogianni
Mary Kodogianni 2011-5-31
移动：Rena Berman 2023-12-29
Hello to everyone, i'm trying to convert an image to logical,so i have to find a threshold for im2bw, but i don't know which is the right algorithm to do this?

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回答（3 个）

Walter Roberson
Walter Roberson 2011-5-31
There is no one algorithm: it depends on what you are interested in examining.
You might want to look at graythresh()
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Mary Kodogianni
Mary Kodogianni 2011-7-14
移动：Rena Berman 2023-12-29
I want to convert an image with gaussian spots to binary and find the coordinates of the gaussians but i don't know wich threshold to use..

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Image Analyst
Image Analyst 2011-7-14
You might be interested in a visual/interactive GUI to allow you to pick a threshold: http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862
Sean de Wolski
Sean de Wolski 2011-7-14
It is calculated from the range of the class(im)
range = getrangefromclass(A);
BWp = (A > range(2) *level);
Is the engine: So for example:
range = getrangefromclass(uint8(magic(3)));
level = 0.75;
range(2) *level
ans =
191.25
>>

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