Change Pixel intensity value
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Hi all,
I have an image(gray scale) whose pixel intensity values ranges from -0.5373 to 0.4744. I would like to change the intensity value which is lesser than 0 to 0. Can any one help me to solve this.
Thanks.
采纳的回答
Honglei Chen
2012-2-21
Say your image is x,
x(x<0) = 0;
5 个评论
Pugazhendhi
2012-2-21
Honglei Chen
2012-2-21
RGB image has 3 pages, so you need to do this for each page. If operation is the same, you can reshape it, do the conversion, and reshape back. For example
x = rand([3 3 3])-0.5;
x = reshape(x,3,[])
x(x<0)=0
reshape(x,3,[],3)
Pugazhendhi
2012-2-21
Honglei Chen
2012-2-21
I'm just making an example, make sure there are negative numbers in x.
Image Analyst
2012-2-22
No, you don't need all that reshaping stuff. "x(x<0)=0" is sufficient to work on the whole 3D matrix (e.g., a color image) - no reshaping is needed.
更多回答（2 个）
vishnu lohith
2018-2-16
0 个投票
use a suitable transformation to change the intensities from ( 0,255) to (65,180).
1 个评论
Image Analyst
2018-2-17
Are you sure you posted to the correct six year old question? Not sure what your answer has to do with the original question about clamping the signal to zero.
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