Hi,
I read and understood the project. i can do this using a tensorflow on raspberry pi.
I worked on several similar projects involving image processing and machine learning, including object detection, dog/cat detection, sentiment analysis based on human expressions and more.
I am a Raspberry Pi and Arduino product developer and have built numerous such projects over the last 5 years.
For the project, I will need some sample images of rice and wheat in order to create a learning data set based on it. Ideally, these should be images of the exact form of rice & wheat that will be visible during operation.
Looking forward to the project.