Leaflet shape analysis separates rose cultivars and estimates leaf area
2019
Mansour Matloobi | Sepideh Tahmasebi | Faribourz Zare Nahandi | Alireza Motallebi-Azar
Trying to use tip leaflet of rose plants as asample to estimate leaf area and to separate rose cultivars, in an experimentwe took leaf images from three different stem layers of four garden roses.After preliminary image pre-processing measures, some important leaf geometricfeatures such as leaf and leaflet area, perimeter, circularity and leafletlength and width were measured or calculated. Analysis of variance showed thatit would be possible to separate rose cultivars by including only two leafproperties, i.e., tip leaflet angle and leaflet area to leaf area ratio. It wasalso determined that three leaf layers along the rose stem can be recognizedand categorized by implementing just angle of tip leaflet. Leaflet area wasagreeably approximated by fitting a simple linear model to the product ofleaflet minor and major axes. Further analyses indicated that some leafletproperties such as solidity, perimeter and circularity can be used assignificant criteria to distinguish rose cultivars, however other features likeleaflet elongation and rectangularity were quite poor and insignificant in thiscase. In conclusion, it was determined that rose leaflet tip angle not only hasthe ability of being as a good morphometric marker in separating rose stem leaflayers but also it is capable of identifying different rose cultivars.
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