(A) The AUCs for each convolutional neural network (CNN) produced by 5-fold cross-validation are shown, with mean (SD) equal to 0.958 (0.005). Model 1 demonstrated the highest level of discriminatory power between acceptable quality images and possibly acceptable quality images, as was indicated by the AUC. Therefore, it was selected for final evaluation on the independent test set (B), where it performed with an AUC equal to 0.965, a sensitivity of 93.9% and a specificity of 83.6%.