Plant Recognition by Inception Networks with Test-time Class Prior Estimation

The paper describes an automatic system for recognition of 10,000 plant species from one or more images. The system finished 1st in the ExpertLifeCLEF 2018 plant identification challenge with 88.4% accuracy and performed better than 5 of the 9 participating plant identification experts. The system is based on the Inception-ResNet-v2 and Inception-v4 Convolutional Neural Network (CNN) architectures. Performance improvements were achieved by: adjusting the CNN predictions according to the estimated change of the class prior probabilities, replacing network parameters with their running averages, and test-time data augmentation.