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Table 1 Summary of the main image acquisition characteristics of the two experimental sites

From: Wheat ear counting using K-means clustering segmentation and convolutional neural network

Sites Date Weather Plot Image size Camera Image Focal length (mm) Resolution (mm)
Xuchang 06/05/2019 Sunny cloudy 12 4000 × 3000 Redmi Note 7 60 5 0.27–0.54
Xuchang 14/05/2019 Sunny cloudy 12 4000 × 3000 Redmi Note 7 60 5 0.27–0.54
Xuchang 14/05/2019 Sunny cloudy 12 4000 × 3000 DJI Phantom 3 Pro 20 4 1.00
Yuanyang 15/05/2019 Sunny cloudy 10 4000 × 3000 Redmi Note 7 490 5 0.27–0.54
Xuchang 16/05/2019 Sunny 12 4000 × 3000 Redmi Note 7 60 5 0.27–0.54
Xuchang 20/05/2019 Sunny 12 4000 × 3000 Redmi Note 7 324 5 0.27–0.54
Xuchang 13/05/2020 Sunny cloudy 12 4608 × 3456 HUAWEI nova 3i 48 4 0.18–0.26
  1. The images collected by the mobile phones were taken by holding mobile phones or holding selfie sticks at an altitude of 1.5–2.2 m. The UAV images were taken at an altitude of 3 m