HDevelop User's Manual

5.2. CAPILLARY VESSEL 97
Figure 5.3: Capillary vessel (left) and texture transformation (right).
figure 5.3 right), because it is too speckled. Therefore you must generalize the texture image by
ameanfilter(ÑÒ Ñ). From this you obtain the so called texture energy (figure 5.4 left).
Figure 5.4: Capillary vessel texture energy (left) and segmentation (right).
The filter mask is chosen very large within this program. The mask size for the horizontal
direction is 211 and 61 for the vertical direction. The asymmetry is used, because the vessel is
nested in horizontal direction. From this you obtain an image with an upper and lower part that
is brighter than that in the middle.
ÖÑ ´ÁѸ ³Ú××гµ
ØÜØÙÖÐÛ× ´ÁѸ ÌÜØÙÖ¸ ³Ð³¸ ¸ µ
ÑÒÑ ´ÌÜØÙÖ¸ ÒÖݸ ¾½½¸ ½µ
ÒØÖ×ÓÐ ´ÒÖݸ Î××е
To separate these areas you just have to find the appropriate threshold. In this case — we
have only two types of textures — the threshold can be found automatically. This is done by
the operator Ò ØÖ×ÓÐ, which also applies the resulting threshold and thus extracts the
vessel. The right side of figure 5.4 shows the result of the segmentation.
HALCON 6.0