A rice grader can be a simple one or two step process, or a multi stage process. In a one step milling process, husk and bran removal are done in one pass and milled or white rice is produced directly out of paddy. In a two step process, removing husk and removing bran are done separately, and brown rice is produced as an intermediate product. In multistage milling, rice will undergo a number of different processing steps.

The basic objective of a rice milling system is to remove the husk and the bran layers, and produce an edible, white rice kernel that is sufficiently milled and free of impurities.The basic objective of a rice milling system is to remove the husk and the bran layers, and produce an edible, white rice kernel that is sufficiently milled and free of impurities.

Physical rice grain composition is one of the components used for rice grading which involve the identification of head rice and broken rice. Rice grading is important to ensure only edible rice reaches the consumer standard. It also protects consumers from price manipulation. A new approach of image processing technique has been developed to detect and identify head and broken rice based on its physical properties, i.e. area, perimeter, minor axis length and major axis length. The rice images were first segmented automatically from background by using Otsu's method. Connected component analysis was later applied to eliminate unwanted noise. Results from the statistical analysis showed that area and perimeter give significant correlations with all of the other properties.

There are two screens provided in the rice destoner, maximum quantity of stones is separated over these two screens. It is advised to maintain a constant flow rate of paddy. The vibration is adjustable as per requirement and both motors to be operated with a single switch. The inclination can be adjustable as per the requirement, variety of paddy/ grain to be cleaned.

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