Apple Stem and Calyx Recognition by Decision Trees

D. Unay, B. Gosselin, and O. Debeir (Belgium)


segmentation; classification; feature selection; CART; C4.5; McNemar


In this paper, a decision tree-based approach for recogniz ing stem and calyx regions of apples by computer vision is proposed. The method starts with background removal and object segmentation by thresholding. Statistical, textural and shape features are extracted from each segmented ob ject and these features are introduced to two decision tree algorithms: CART and C4.5. Feature selection is accom plished by sequential floating forward selection method. Analysis showed that feature selection improves accuracy of both system. Eventhough CART performed slightly bet ter than C4.5 after feature selection, McNemar’s test found them statistically indifferent.

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