Changes in Machine Dependent RGB Colour Coordinates of Alphonso Mango During Ripening Using Digital Image Processing

A study was carried out to explore the possibilities of using machine dependent colour coordinates for prediction of ripening of mangoes. Alphonso mangoes were used for the study. The raw mangoes were kept in ripening chamber after ethylene treatment. Digital images were taken in every 24 h interval throughout the ripening period of 19 days. Then the machine dependent colour coordinates red (R), green (G) and blue (B) were extracted from the images using MATLAB. It was found that, the red and green were changing significantly during ripening of mangoes than blue. So the red and green would be more suitable to predict the ripening colour change rather than B value. In case of ratios, the red ratio (R/B), the green ratio (G/B) bothblue ratios would be suitable to predict the ripening.