Determination of HSV Colour Indices of Dragon Fruit
Abstract
Dragonfruit (Hylocereus spp.) is a vibrant tropical fruit gaining attention for its unique appearance, nutritional value, and market potential. Its color serves as a critical determinant of consumer preference, reflecting fruit quality and maturity. This study aimed to quantify the HSV (hue, saturation, and value) color indices of dragonfruit at different maturity stages—unmature, mature, and overmature—using advanced image processing techniques. Images were collected under controlled conditions, preprocessed for segmentation, and analyzed using MATLAB R2023a. The HSV parameters were calculated for 400 samples, revealing distinct variations in color attributes across developmental stages. Mature dragonfruit exhibited the highest hue values, indicating peak coloration, while overmature fruits showed a decline due to potential discoloration. Saturation values were most vivid in mature fruits, signifying optimal pigmentation, whereas unmature fruits displayed subdued colors. Brightness progressively increased with maturity but slightly decreased in overmature samples. Combined HSV indices provided a robust metric for differentiating between maturity stages, with the highest values observed at the mature stage. These findings underscore the utility of HSV color indices as reliable indicators for maturity classification, contributing to quality control, automated sorting, and improved postharvest management.
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Introduction
Dragonfruit, commonly known as Hylocereus spp., is a tropical fruit gaining global attention due to its vibrant color, unique appearance, and nutritional value. The fruit is not only consumed fresh but also processed into products such as juices, jams, and food colorants, making its visual appeal a critical determinant of consumer preference [7]. Among the visual characteristics, color plays a pivotal role as it is often associated with quality, ripeness, and overall marketability [8]. Color indices, such as those derived from Lab* (lightness, chromaticity), RGB (red, green, blue), and HSV (hue, saturation, value) color spaces, offer an objective method to quantify color attributes. These indices have been widely used in agricultural research to evaluate fruit quality and ripening stages [2]. For dragonfruit, however, research on standardized color indices remains limited, despite its expanding commercial relevance. This study aims to determine and evaluate the color indices of dragonfruit under varying conditions, including ripeness levels and storage treatments. By establishing reliable color metrics, this research intends to contribute to better quality control and postharvest management practices for dragonfruit. Furthermore, it seeks to bridge existing gaps in literature regarding color quantification and its applications in the dragonfruit value chain.
Conclusion
The comprehensive methodology employed in this study combines field-based data collection, advanced image processing, and robust statistical analysis to establish reliable HSV color indices for mature dragon fruit. This systematic approach ensures the accuracy and reproducibility of results, paving the way for future research on the visual quality assessment of dragon fruit and other horticultural crops.
The study successfully quantified the HSV color indices of dragonfruit at different maturity stages using image processing techniques. The results demonstrated clear distinctions in hue, saturation, and brightness values between unmature, mature, and overmature fruits. The mature stage exhibited the most desirable color characteristics, as indicated by the highest HSV values, while the overmature stage showed signs of quality decline. These findings underscore the importance of HSV indices as reliable and objective indicators for fruit maturity classification. Future research could explore the integration of these indices with machine learning algorithms for automated maturity detection. Additionally, investigating the relationship between HSV parameters and biochemical attributes, such as pigment concentration and sugar content, could provide deeper insights into the ripening process. Such advancements would further enhance the applicability of color indices in improving the quality and marketability of dragonfruit.
