在当前人眼视觉系统（HVS）特性研究的基础上提出基于梯度及HVS特性的离焦模糊图像质量评价模型（GVSSIM）。该模型利用Sobel边缘梯度算子提取图像的梯度信息，并根据人眼视觉特性进行视觉加权，得到新的结构相似性评价指标，进而获得图像质量评价指标。该方法与SSIM(图像结构相似度)评价模型相比，具有计算简单的特点，对离焦模糊图像的评价结果能更好地反映人眼视觉感受。

Abstract The style-based GAN architecture (StyleGAN) yields state-of-the-art results in data-driven unconditional generative image modeling. We expose and analyze several of its characteristic artifacts, and propose changes in both model architecture and training methods to address them. In particular, we redesign generator normalization, revisit progressive growing, and regularize the generator to encourage good conditioning in the mapping from latent vectors to images. In addition to improving image quality, this path length regularizer yields the additional benefit that the generator becomes significantly easier to invert. This makes it possible to reliably detect if an image is generated by a particular network. We furthermore visualize how well the generator utilizes its output resolution, and identify a capacity problem, motivating us to train larger models for additional quality improvements. Overall, our improved model rede- fines the state of the art in unconditional image modeling, both in terms of existing distribution quality metrics as well as perceived image quality.

本文档是海思官方提供的Hi3518SDK图像质量调试工具指南，对于进行基于Hi3518开发的人员，主要辅助调试人员进行图像效果及差异化的调节。

JPEG图像编码中质量因子选取方法研究，王文军，pdf版本

通过四元数小波变换分解立体图像的左右视图,获取不同尺度不同方向的幅值相位信息,并结合人眼视觉特性生成单目图;对左右视图和单目图作亮度去均值对比度归一化(MSCN)处理,获取MSCN系数图,采用广义高斯分布模型拟合MSCN系数和MSCN四方向邻域系数乘积,提取统计参数特征(联合峰度、偏度、标准偏差和能量),组成特征向量,通过XGBoost模型预测图像质量感知得分。结果表明,所提立体图像质量评价算法在LIVE3D图像库上优于其他方法,并且运行速度得到大幅度提高。

计算两幅图片的PSNR和SSIM

基于结构相似性SSIM的图像质量评价方法是通过两幅图像的亮度、对比度以及结构相似度的对比来实现评价效果的。

对Pytroch版本的代码做了整理，直接点击train.py即可完成训练。

特征相似度评价算法远吗，Matlab实现代码

适合在视频和图像领域进行算法研究的开发者，经典算法有参考意义。