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REGION GROWING is a method by which the user defines a starting point (seed) within the object of interest, and the algorithm tries to find all connected pixels which fulfill a certain criterion. It is required to triangulate the seed point with the orthogonal plane layout as illustrated below.

P3D Region Growing

The inclusion criterion is formed by the Threshold value and the Direction specification:

= include all connected pixels with a value Threshold ± Deviation;

>= include all connected pixels above the defined Threshold value;

<= include all connected pixels below the defined Threshold value.

Note the Probe value which displays the image value at the position of the cursor, which is useful for finding appropriate Threshold setting.