how to convolute an image with low pass filter?

[liaw82]

Hi,

I need to convolute a whole image by using a low pass filter. I know there is a low pass filter vi but it looks like it is applied to an image one shot but not "convolute" the image. Does anyone have an idea of doing this?

thz

[BruceAmmons]

Use the IMAQ convolution vi.  The icon is a circle with an X in it.  It is in the same palette as the low pass filter.  You need to provide the matrix input for the convolution and the images.

Bruce

[RManion]

Hi Liaw,

Bruce is correct, and the matrix input he referred to is called a Kernel.  Many useful kernels are outlined in the IMAQ Vision Concepts Manual.

Good luck on your application,

Robert

[liaw82]

Hi,

I knew convolute vi can be used. However, what is the input matrix of kernel that has property of low pass filter? In other words, I need to convolute an image with low pass filter's kernel...

thx..

[RManion]

Two examples of a smoothing kernel are:

0  1  0           2  2  2
1  0  1           2  1  2
0  1  0           2  2  2

The topic of kernels is covered both in the Vision Concepts Manual and many image processing textbooks.

Hope this helps!

Robert