ON THE SHAPE VARIATION OF PEACHES DURING RIPENING
Evaluation of peach (Red Heaven) shape variability in different stages of ripening was performed. Peach shapes were described by several methods: measuring main axis dimensions with consequent calculation of variation coefficients and expression of shape index by calculating the H/Ds, H/Dc and Dc/Ds ratios.; surface description by means of 3-D scanning; and shape variation evaluation based on elliptic Fourier descriptors. The latter approach enabled definition of the influence of the height to width ratio, position of the center of gravity, curvature and degree of roundness. The scores of the resulting components were used in subsequent analysis as peach shape characteristics. The variation in shape accounted for by each component was visualized using inverse Fourier transformation. The first four principal components provided a good summary of the data, accounting for almost 100% of the total variance. Dominant importance and relevance of length to width ratio (contributing 55 to 82% to the total variance in front view and side view) as a determining parameter of stone shape was quantitatively confirmed. This method is a simple but powerful interpretation tool which is highly applicable to evaluation of biological shapes.
Severa, L., Nedomová, S., Buchar, J., Havlíček, M., Koutný, D. and Paloušek, D. (2012). ON THE SHAPE VARIATION OF PEACHES DURING RIPENING. Acta Hortic. 962, 285-290
shape variability, ripening, image analysis, Fourier descriptors