A color vision sorter capable of performing full
color spectral sorting of different varieties of fruits and
vegetables including apples, peaches, tomatoes and
citrus was developed for color, size and shape, with a
capacity of up to 44 tons per hour [11]. However, much
of the above work had not been used in commercial
apple sorting systems because of the constraints in
speed, accuracy and flexibility. Correct classification
rates (CCR) were calculated from the confusion matrix.
The overall accuracy was 94 %.Three methods were
discussed for apple size determination by applying
known geometrical models [12]. A simplified Machine
vision system was developed for estimating size of
pomegranates [13]. It allows the estimation of volume,
surface area and weight of fruit using prediction
equations developed from the relationship between
projected area, shape and size. An automatic detection
system for finding out surface quality parameters and
defects of fruits like apples was designed [14].But this
paper mainly deals with mechanical aspects. Image
processing method with the disk approximation
technique was employed to estimate the volume of
cantaloupes of varying sizes from sets of two surface
images captured with a digital camera [15]. Algorithm to
grade papaya samples according to their size using
estimated weight information with 90% classification
accuracy was reported [16].A technique was developed
using fuzzy sets to correlate the attributes of size, color,
shape and abnormalities, obtained from tomato images,
with the inner quality of the tomato samples [17].