To analyze the contaminated rice seeds, the most of rice
seeds to be discriminated is from the G histogram, in five
levels of histogram. There are three responses as not rice seed,
rice seed, or process to next step. Testing with 100 seeds in G
process can distinguish 79 seeds. Classification of rice seed is
67 rice seeds and 12 sticky rice seeds. The other 21 seeds are
unclassified in this process. Then process the on R histogram,
21 seeds are classified in this process. From 9 seeds, there are
6 rice seeds and 3 sticky rice seeds. In B histogram process,
input 12 seeds for classification in the process, as 6 rice seeds
and 3 sticky rice seeds. There are 3 rice seeds undistinguished.
We demonstrate all the undistinguished rice seeds by
destructive method.