imfilter and filter2

2012 5 2

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6 次查看（30 天）

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Hi guys,

Are imfilter and fiter2 the same for two dimensional array?

I did a lot of experiment. It seems they are the same. But filter2 are much faster than imfilter

Thanks,

Zhong

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Wayne King 2012-5-2

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Yes, they are the same in some instances:

    h = 1/100*ones(10,10);
    x = randn(20,20);
    y = filter2(h,x);
    y1 = imfilter(x,h);
    max(abs(y(:)-y1(:)))

but imfilter() gives more options to specify boundary conditions for example and whether to rotate the kernel or not -- 'corr' vs 'conv'

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