Abstract: As an important edible quality, beef color is a significant charcteristic to differ from the fat and also a grading index.Combining with a standard beef color chart, this paper analyzed the RGB color characteristics of beef by means of statistical andtheoretical ways. At last the rules of beef color were obtained and the implementation of the automatic grading algorthm assured.

Key words: automatic grading, beef color, RGB (Red Green Blue) color system, computer vision, image process