Good and bad classification of Guava (Psidium Guajava)
Description
guava is (Psidium guajava) commonly known as pointed gourd, is a nutritious fruit widely consumed in South Asia. Rich in vitamin C, boosts immunity Good source of dietary fiber, improves digestion and prevents constipation Helps in blood sugar control, helps prevent cell damage Improves skin health and slows aging Aids in weight management (low calorie, high fiber). The standard shelf life of Psidium guajava(Guava) mainly on storage conditions:Guava spoilage is rapid due to thin skin, with a shelf life of only 3-4 days at room temp but extendable to 1-3 weeks in controlled conditions like 8-10°C for mature fruit, using methods like packaging (polybags/cling wrap), modified atmosphere storage, edible coatings, or chilling injury prevention. The Guava fruits showing green to light green colour with relatively smooth and intact skin represent better-preserved samples, although slight shrivelling and surface dullness suggest moisture loss and advancing senescence. In contrast, the severely deteriorated fruit exhibits orange–yellow discoloration, extensive fungal growth (white mycelium) tissue softening, and surface decay, which are typical symptoms of microbial spoilage and over-ripening. These changes reflect high respiration rate, enzymatic breakdown of tissues, and microbial invasion during prolonged storage. The image clearly demonstrates that after 14 days, Guava stored under uncontrolled or suboptimal conditions becomes unacceptable for consumption, confirming its limited shelf life. Sample collection:- Fresh and mature fruits of psidium guajava were collected from local markets of Malda town, West Bengal, India (24°59′N, 88°08′E), and the collection location was mapped using GPS coordinates. Immediately after procurement, the samples were sorted to remove damaged or visibly spoiled fruits. The selected potol samples were first washed thoroughly with normal tap water to remove adhering soil and surface impurities. Digital images of the samples were captured using a smartphone (Redmi C12) operating on Android version 12 (Funtouch OS 2.0.4.0). The device was equipped with an octa-core processor (2.3 GHz), 4 GB RAM, and 128 GB internal storage.Image acquisition was carried out daily for 14 consecutive days after purchase to monitor visual quality changes and shelf-life deterioration. Approximately 1000 images were captured per day, out of which 73 high-quality images per day were selected based on clarity, focus, and uniform illumination for further analysis. The image dataset was used to study progressive changes in color, texture, surface integrity, and microbial spoilage during storage. This systematic image acquisition protocol enabled continuous non-destructive monitoring of Guava quality throughout the storage period. In this dataset, the bad image folder contains 500 images of Guava (psidium guajava )and the good image folder also contains 500 images of Guava (Psidium Guajava) Therefore, the total number of images in the dataset is 1000.