School of Software;
Shandong University;
Jinan 250101;
China;
School of Computer Science and Engineering;
Nanjing University of Science and Technology;
Nanjing 210094;
China;
School of Information Science and Engineering;
Shandong Normal University;
Jinan 250358;
China;
denoising; stochastic progressive photon mapping(SPPM); deep learning; residual neural network;