How can i preprocess the rice colored image before applying this code

[DGM]

See also:

https://www.mathworks.com/matlabcentral/answers/2040161-number-of-objects-in-images

Answer 1

[Walter Roberson]

You need to convert the image to grayscale and save it to 'rice_preprocessed.png'

For anything else, you should consider building better region detection code, instead of trying to figure out how to reverse-engineer an image that will work well when put through this particular code.