>Professor Pelli,dear michelle
>
>I'm one of your fans of your website --- psychophysicaltoolbox.You are so
>kind to contribute your works and provide the toolbox. I really learn a
>lot from the website.
>
>I'm a self-learner in Matlab with limited knowledge in programing. May I
>ask you a question about blurring an image? I found a problem in my work,
>when I created some blurred images with the following codes:
>Img=imread(I.tif');
>G=rgb2gray(s);
>n=double(G)/255;
>f=[1/16 2/16 1/16; 2/16 4/16 2/16; 1/16 2/16 1/16];
>C=conv2(n,f,'same');
>
>I found that the degree of blur is too significant. How can I blur images
>with just-noticeable-difference?
>
>
>
>Thank you for your kind attention.
>
>
>Best Regards,
>Michelle
you're doing what i'd do, but others in the forum may have useful
suggestions, so i'm forwarding your query there.
http://yahoogroups.com/group/psychtoolbox/
you could also low-pass filter using the 2d fft.
best
denis
NOTE TO ALL: denis.pelli@... is my preferred email address. Please
use that address. My "verizon.net" address will go away soon, partly
because Verizon forces me to use that as my "From:" address. My current
email program won't allow me to designate a separate "Reply-to:" address.