Standards Development
This International Standard specifies a method for determination of the kernel shape of husked or milled rice using an image acquisition device.
The International Codex Standard Rice (CODEX STAN 198-1995) and ISO standard for Rice Specification (ISO 7301-2021) classify rice based on grain length, grain width, and length/width ratio. For example, according to CODEX STAN 198-1995, if rice is classified as long, medium, or short kernels, the classification should be in accordance with one of the following specifications. Option 1, kernels length/width ratio: for long grain rice, husked rice or parboiled husked rice with a length/width ratio of 3.1 or more, milled rice or parboiled milled rice with a length/width ratio of 3.0 or more; for medium grain rice, husked rice or parboiled husked rice with a length/width ratio of 2.1-3.0, milled rice or parboiled milled rice with a length/width ratio of 2.0-2.9; for short kernel rice, husked rice or parboiled husked rice with a length/width ratio of 2.0 or less, milled rice or parboiled milled rice with a length/width ratio of 1.9 or less. Option 2, the kernel length: long grain rice has a kernel length of 6.6 mm or more, medium grain rice has a kernel length of 6.2mm or more but less than 6.6mm, short grain rice has a kernel length of less than 6.2 mm. Option 3, a combination of the kernel length and the length/width ratio: long grain rice has a kernel length of more than 6.0mm and with a length/width ratio of more than 2 but less than 3, or a kernel length of more than 6.0mm and a length/width ratio of 3 or more, medium grain rice has a kernel length of more than 5.2mm but not more than 6.0mm and a length/width ratio of less than 3, short grain rice has a kernel length of 5.2mm or less and a length/width ratio less than 2. At present, both internationally and domestically, manual methods are mainly used for detecting the length and width of large rice grains. This method requires arranging the rice grains in one direction and taking the average after measuring 100 grains, which is timeconsuming, laborious, and subjective in sample selection, resulting in high experimental result errors. By using a rice appearance scanner, grain length, grain width, and aspect ratio can be determined through image analysis, which is fast, accurate, and has good application prospects.
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