Watermelon is one of the tropical fruits which is often favored
among all of the different types of fresh agricultural produce
worldwide. For the commercial market, fresh and high-quality
watermelons are harvested at a suitable maturity level based on
the appearance of the fruit. With respect to this condition, the
internal quality is required for monitoring the quality changes
especially during storage. Physicochemical and environmental
aspects are the main factors that could affect the quality of the fruit
with regard to texture, sweetness, flavor, color, and shelf-life (Wani
et al., 2014). Apart from that, the evaluation of fruit quality is
crucial to determine the consumer’s choice when purchasing fresh
watermelon, taking into account the quality grade and fruit
maturity.
Recently, non-destructive optical techniques have been used in
the evaluation of quality for various types of food and agricultural
produce during postharvest processing. In this regard, numerous
non-destructive techniques have been applied due to the robustness
of the device, the lack of need for sample preparation, and the
ability to perform rapid measurements