Fig. 1. Counting and discriminating paddy rice in three parts and the relative errors of unfilled paddy rice. A, Numbering of paddy rice in the image without overlapping (The output of the first part of the algorithm). B, Counting paddy rice in the image with overlapping (The output of the second part of the algorithm). C, Counting unfilled paddy rice (The output of the third part of the algorithm). In B and C, Paddy rice in red indicates unfilled small paddy rice; Paddy rice in green indicates unfilled normal paddy rice; Paddy rice in blue indicates two unfilled paddy rice which are connected; Paddy rice in yellow indicates three unfilled paddy rice which are connected; Paddy rice in cyan is connected more than three unfilled paddy rice which are connected. ‘+1’ in B represents one paddy rice counted additionally. ‘-1’ in C represents one unfilled paddy rice misclassified as a filled one. D, Result of counting overlapping paddy rice based on 27 sample images. E, Relative error of paddy rice counting in 27 images.