Before revision:  Although the top-performing methods rely on RGB-D image channels, strong results were achieved when only RGB channels were used at both training and test time -- out of 26 evaluated methods, the third method was trained on RGB channels of PBR and real images, while the fifth was trained on PBR images only.
After revision:  Although the top-performing methods rely on RGB-D image channels, strong results were achieved when only RGB channels were used at both training and test time -- out of 26 evaluated methods, the third method was trained on RGB channels of PBR and real images, while the fifth on RGB channels of PBR images only.