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Correlation between oil content and DN values RGB Colour Analysis Ripe oil palm fruit is reddish in color. In this study, a camera captures the image of the fruit by using 8-bit storage which contains 3 planes known as Red, Green and Blue planes. Combination of these three planes makes it 24-bit. Each plane gives different DN value with reference to the fruit. Table 3 shows DN value results for ripe, over ripe and under ripe fruits sample. For the Ripe fruit category, the red band shows the highest value compared to the Green and Blue bands. This is because the ripeness of oil palm fruit is indicated by the reddish color of ripe fruit. For the green band, the mean DN value is in the range of 18 < = Greenripe > = 60. For the blue band, the range is < = 6 Blueripe 23. < = Red band of over ripe fruit shows the highest DN value. The range of mean DN values is 166 < = Redover ripe203. < = The oil content for this category is between 10.16% and 20.4%. For green band, the range of mean DN values is between 32 < = Green over ripe < = 69. For the Blue band, the range of DN values is between 14 < = Blueover ripe < = 29. Although the RGB values for this fruit samples shows higher value compared to the ripe fruit, the mean oil content is approximately the same compared to the ripe fruit sample. Mean DN values for the under ripe fruit category is in the range of 113 < = Red under ripe < = 188 for the red band, for the green is 49 < = Green under ripe < = 98 and for the blue band the range is 4 < Blue under ripe < = 20. The mean oil content of the under ripe fruit is 7.16%.  Fig 6(a): Linear Regression of Red Band for Ripe Fruit Sample Regression Analysis & Accuracy Assessment A linear regression was carried out using the oil content and the DN values. Figure 6(a) shows that, for the Red band, there is good correlation between the oil content and the DN values. The correlation is represented by value R2 = 0.8549. For the green and blue band, values for R2 are 0.6026 and 0.704 respectively. These values show good correlation between this two parameters as the value of R2 approaches 1.0 (Fig. 6 (a), (b), (c)).  Fig 6(b): Linear Regression of Green Band for Ripe Fruit Sample For the over ripe fruits, the regression line is shown by the Fig. 7 (a), (b), (c). From this line, we can conclude that the blue band gives the highest correlation which can be seem by the figure R2 = 0.7832. The red band is represented by R2 = 0.1793 and the Green band R 2 = 0.6293. From this figure, we can conclude that for the over ripe fruit, Blue band is significant to estimate oil content. |