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Gaussian highpass filter

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Gaussian highpass filter Daniel Andrei 10 Feb 11:19
  Gaussian highpass filter saulgoode@flashingtwelve.brickfilms.com 12 Feb 04:39
Daniel Andrei
2009-02-10 11:19:12 UTC (about 16 years ago)

Gaussian highpass filter

Hello,
I'm sorry if this is not the proper place to post this , but I have a question and I hope some of you may be able to help me, so here goes: I need to apply a gaussian high pass filter on a grayscale image represented as a pixel matrix.
After doing some reading I understand that I need to a pply a transformation matrix on each pixel of the image, actually a transformation vector in two passes, once for the x axis and once for the y axis resulting in something like(for a row, for example):

transofrmationSum = the sum of the transformationVector elements for (i=0, i
pixels[i+(j-transformationVector.size/2)]*transformationVector[j]/transformationSum }
}

Please tell me if this is correct and how do I compute the transormation matrix for the gaussian high pass filter.

Thank you, Daniel

saulgoode@flashingtwelve.brickfilms.com
2009-02-12 04:39:14 UTC (about 16 years ago)

Gaussian highpass filter

Quoting Daniel Andrei :

Hello,
I'm sorry if this is not the proper place to post this , but I have a question and I hope some of you may be able to help me, so here goes: I need to apply a gaussian high pass filter on a grayscale image represented as a pixel matrix.

Wouldn't that basically be the difference between the original image and a Gaussian blurred version? (i.e., duplicate the layer, set the layermode of the duplicate to "Difference", and Gaussian blur the duplicate)