MRI enhancement ACE 变分法 色彩校正 CNN ADMM Computer Vision OCR CTW DRCN SR Deconvolution video enhancement Fusion GAN ImageNet ILSVRC low-light enhancement enhancement Machine Learning mutil-task learning data harmonization FAN RARE STN SRN R-CNN Reinforcement Learning image enhancement ResNet LSTM Denoising SICE SRCNN SID super resolution Deep Learning Self-supervised VGG convex set convex function 图像增强 无监督学习 MRI Segmentation 图像分类 MR Image Synthesis