100%、91.4%、88.9%和76.8%。The area and wide length ratio was chosen as the characteristic parameters for different kinds of rice seeds, and a database of rice seeds type was constructed. The equivalence rectangle’s length and the least wide difference were used as standard to identify unknown rice seeds type. The disrepair of the rice seeds was identified based on the times of the black pixels change to the white pixels on one scan line and the number of scan lines. The mildew of rice seeds was identified based on the difference of area obtained by two different thresholds. Ten kinds of rice seed samples like Fengyuanyou 299 were chosen for the experiments. During the experiments, inspection of seeds type, identification of seeds in work positions, geometry parameters of seeds, mildew and disrepair situations of seeds were done respectively. The accuracy was 100%, 91.4%, 88.9% and 76.8% respectively. 