Convolution Menu

The filters described in this menu are based on a simple MxN convolution matrix. For a given pixel the resulting intensity is product of this matrix with the pixel and its neighbours. The convolution kernals are all 3x3 apart from [L Low pass, MxN point] and [U User-specified convolution kernal], both of which may be any user-defined size.

1 Low pass filter using the four nearest neighbours - 3x3 kernal.

2 Low pass filter using the eight nearest neighbours - 3x3 kernal.

3 High pass filter using the four nearest neighbours - 3x3 kernal.

4 High pass filter using the eight nearest neighbours - 3x3 kernal.

5 Laplacian filter using the four nearest neighbours - 3x3 kernal.

6 Laplacian filter using the eight nearest neighbours - 3x3 kernal.

L Low pass, MxN point.

Averages the intensities over the specified kernal. The kernal may be of any size.

U The user supplies convolution matrix kernal.

It may be of any size.

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