Question about Gaussian Blur

Posted by Ting Xu on Jan 31, 2015; 9:26am
URL: http://imagej.273.s1.nabble.com/Question-about-Gaussian-Blur-tp5011393.html

 Hi,
I do not kown how to set the parameter when I use the gaussian blur filter in Figi(Image J 1.49m) . In the guide, it has said that “Sigma is the radius of decay to e − 0.5 (≈61%), i.e., the standard deviation (σ) of the Gaussian (this is the same as in Adobe®Photoshop®, but different from ImageJ versions till 1.38q, in which radius was 2.5 × σ “.  At the same time, I have found a letter, that you send to a user named Jarek in 4 May 2007, written that “With ImageJ 1.38r, you have to enter the standard deviation directly, and ImageJ will calculate an appropriate kernel size.”.So, is the kernelradius equal to sigma with the Image J 1.47m? i.e. if I enter 1 as the value ofthe standard deviation sigma,that the kernel radius is equal to 1 pixel too,and have a 3x3 kernel.


How toset this parameter in the new version?


 
Please,any suggestions? Anything will be greatly appreciate.

Thankyou very much. Warm regards,

Ting Xu 
School of stomatologyWuhan universityPR China
Email: [hidden email]

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