Single image super-resolution (SISR) with generative adversarial networks
(GAN) has recently attracted increasing attention due to its potentials to
generate rich details. However, the training of GAN is unstable, and it often
introduces many perceptually unpleasant artifacts along with the generated
details. In this paper, we demonstrate that it is possible to train a GAN-based
SISR model which can stably generate perceptually realistic details while
inhibiting visual artifacts. Based on the observation that the local statistics
(e.g., residual variance) of artifact areas are often different from the areas
of perceptually friendly details, we develop a framework to discriminate
between GAN-generated artifacts and realistic details, and consequently
generate an artifact map to regularize and stabilize the model training
process. Our proposed locally discriminative learning (LDL) method is simple
yet effective, which can be easily plugged in off-the-shelf SISR methods and
boost their performance. Experiments demonstrate that LDL outperforms the
state-of-the-art GAN based SISR methods, achieving not only higher
reconstruction accuracy but also superior perceptual quality on both synthetic
and real-world datasets. Codes and models are available at
this https URL

本文提出了一种基于局部统计的判别学习（LDL）方法，以训练一种稳定生成感性真实细节且抑制视觉伪像的基于 GAN 的单图像超分辨率模型，实现了比最先进 GAN 方法更高的重建精度和更好的感性质量。