| findtb | Find high and low gray level points |
| -in <image> | input image |
| -dout <nodes> | points in a data frame |
| [-size <maskrad>] | radius of search area |
| [-neq] | neighbourhood has not same gray level |
| [-t] | find tops (light areas) |
| [-b] | find bottoms (dark areas) |
This command is used for finding points characterizing structure of (paper) image. Resulting data frame contains fields x, y and gray. First two define coordinates of points and third field has value 0 or 255 telling if point is bottom or top point, respectively.
Example: See section 6.6.4.