A Simple Model for Rapid and Nondestructive Estimation of Bell Pepper Fruit Volume

Abstract

<jats:p>Nondestructive estimates of fruit volume are used for yield prediction. They are also used to study the relationship between fruit expansion rate and susceptibility to diseases or physiological disorders such as fruit cracking. A model relating bell pepper (<jats:italic>Capsicum annuum</jats:italic>) fruit diameter and length to its volume was derived using the equation of the volume of a sphere as the starting point. The model has the following formula: V<jats:sub>F</jats:sub> = KD<jats:sup>2</jats:sup> Lπ/6, where V<jats:sub>F</jats:sub> is fruit volume, K is the shape factor that varies with fruit type, D is fruit diameter, and L is fruit length. The model is simple, easy to use in the field, and may account for variations in fruit shape. Regression analyses using actual fruit volume of bell pepper measured with the water displacement method and the volume estimated using different equations showed that accuracy of the new model is comparable to that of one of the best models previously proposed. However, because the model is less complex than previous models, it is easier to use in the field.</jats:p>

Evaluation of Morphological and Agronomical Characterization of Turkish Pepper Accessions

“…Ascorbic acid (vitamin C) content of the juice was determined by titration with the 2,6-dichloroindophenol method (Association of Official Analytical Chemists [AOAC], 1995). Fruit volume was calculated as V F = 1.1 * D 2 * L * π * 6, where: V F = fruit volume, D = fruit diameter, L = fruit length (Ngouajio et al, 2003). Acidity was measured by titration with 0.1 N NaOH to pH 8.1 and results expressed as citric acid in the juice.…”

A new method for assessment of bunch compactness using automated image analysis

“…The morphological features most commonly used to characterise the shape of an object are the area, the perimeter, the length of the major and minor axes, and also the aspect ratio (Costa et al 2011). Other authors used several ratios to estimate volume in bell peppers (Ngouajio et al 2003) or for in-line sorting of mandarins (Blasco et al 2009a). Accordingly, Venora et al (2009) used the length/circumference ratio for beans, and Wang and Nguang (2007) used length/ diameter ratios in order to extract fruit volume of axi-symmetric agricultural products.…”

Shape Analysis of Agricultural Products: A Review of Recent Research Advances and Potential Application to Computer Vision

“…Generally, the length/circumference ratio consistently contributes to the determination of the fruit shape, which is an important quality factor (Venora et al 2007(Venora et al , 2009. Length/diameter ratios were studied in order to extract fruit volume (Sabliov et al 2002;Wang and Nguang 2007) and attribute shape classes as described, for example, in bell peppers by Ngouajio et al (2003).…”