Levenhuk C800 NG Digital Camera, USB 2.0 - Manual (Page 89)

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Thinning filter will not operate upon True Color images. If one wants to
thin a
True Color image, he must first convert it to Gray Scale .
Distance The distance filter is used to show the distances of pixels within blobs to
the outer boundaries of those blobs. After applying the distance filter, the
background will be black (i.e. pixels with value 0). Only the area within
the blobs will have non-zero values (will be white). The values of each
pixel within the blob will be a count of the shortest distance from that
pixel to the edge of the blob. Thus, all pixels along the blob's border will
have a value of 1 (since they are one pixel away from the edge of the
blob); pixels that are a distance of 2 from the border will have the value
2, and so on. This creates a distance map of the image. The Distance
filter will not operate upon True Color images. If one wants to use the
Distance filter with a True Color image, he must first convert it to Gray
Scale .
Options :
1. If Erode , Dilate , Open , or Close filters is checked, the options will relate to the
kernel size and shape. The following options will be presented:
2 x 2 Square Check to use the 2x2 square kernel configurations.
3 x 1 Row Check to use the 3x1 row kernel configuration.
1 x 3 Column Check to use the 1x3 column kernel configuration.
3 x 3 Cross Check to use the 3x3 cross kernel configuration.
5 x 5 Circle Check to use the 5x5 circular kernel configurations.
7 x 7 Circle
Check to use the 7x7 circular kernel configurations. This is a
two-pass filter, accomplished using a 5 x 5 circle followed by a 3x3
cross.
11 x 11 Circle
Check to use the 11 x 11 circular kernel configurations. This is a
three-pass filter, accomplished using a 5 x 5 circle followed by
another 5 x 5 circle, followed by a 3 x 3 cross.
Passes Set the number of times iterate the filter.
Note : The circular kernels are especially effective on round objects (cells, grains and
so on) because their circular configuration preserves the circular shape of the objects