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Untitled - MendelNet 2013 - Mendelova zemědělská a lesnická ...

Untitled - MendelNet 2013 - Mendelova zemědělská a lesnická ...

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MENDELNET <strong>2013</strong>Fig. 1 The measurement procedure THRESHOLD + WAND (TRACING) TOOL on the caudal fin.On the left, the first image is demarcation of borders in Paint.net. The second image is drawing finstool THRESHOLD and third marking outline WAND (TRACING) TOOL.RESULT AND DISCUSSIONThere were evaluated 13 dorsal and caudal fins. The results show no statistically significantdifference (p> 0.05) between the two methods (Tab.1).Tab. 1 The measured values for fins in mm 2 .Fin Dorsal CaudalFishPOLYGONSELECTIONTRESHOLD+WAND(TRACING) TOOLPOLYGONSELECTIONTRESHOLD+WAND(TRACING) TOOL1 510,42 510,6 672,57 674,642 309,03 313,6 1116,02 1116,613 759 759,85 1692,92 1693,864 559,55 559,46 1400,22 1399,975 550,98 540,58 1108,19 1110,96 591,07 594,12 1317,85 1314,127 330,46 333,39 1326,32 1331,798 352,89 354,2 629,4 633,699 524,41 530,67 1074,09 1078,7210 488,24 491,74 876,63 882,7911 90,17 91,51 834,87 833,0512 361,36 363,75 989,46 994,7913 202,52 203,64 743,54 746,09Image analysis is suitable for the biometric measurement. It is characterized by less variability thanmanual measurements (Goodenough et al. 2012). POLYGON SELECTION requires more time tomeasure and higher number of clicks, for example to surface caudal fin is needed on average 177clicks. It depends on the size, the degree of damage and frayed fins. Measurement usingTHRESHOLD + WAND (TRACING) TOOL is faster, about 90% less mouse clicks (to get surface750 | P age

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