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In recent years, due to increasing necessity and the rise in agricultural production worldwide, an efficient, uncomplicated and precise classification mechanism of agricultural crops is indeed an important endeavor for high quality products. This paper reviews the recent techniques and features of external grading systems for the non-destructive operation and performance of automated quality verification systems for agricultural products. The grading systems utilize highly technical engineering designs and image processing techniques to convey information and grade the products. The most common methods and techniques involved in the grading system’s external inspection stages such as color, size, shape and texture are highlighted.

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