论文标题
学习一个具有多种质量因素的单个模型,用于删除JPEG图像伪像
Learning a Single Model with a Wide Range of Quality Factors for JPEG Image Artifacts Removal
论文作者
论文摘要
有损的压缩将伪像的伪像带入压缩图像并降低视觉质量。近年来,许多基于卷积神经网络(CNN)的压缩伪像删除方法已经成功地开发了。但是,这些方法通常会根据一个特定值或少量质量因素训练模型。显然,如果测试图像的质量因子与假定的值范围不匹配,则会导致降级性能。通过这种动机和进一步考虑实际用法,本文提出了高度稳健的压缩伪像去除网络。我们提出的网络是一种单个模型方法,可以培训用于处理各种质量因素,同时始终提供较高或可比的图像伪像删除性能。为了证明,我们将重点放在JPEG压缩的质量因素上,范围从1到60。请注意,我们提出的网络的交钥匙成功在于量化表作为培训数据的一部分的新利用。此外,它并行两个分支 - 即修复分支和全球分支。前者有效地去除了当地的伪影,例如响起的伪影去除。另一方面,后者提取了整个图像的全球特征,这些特征可提供高度工具的图像质量改进,特别是有效地处理全球工件,例如阻塞,颜色变化。对颜色和灰度图像进行的广泛实验结果清楚地证明了我们提出的单模方法在从解码图像中去除压缩伪像的有效性和功效。
Lossy compression brings artifacts into the compressed image and degrades the visual quality. In recent years, many compression artifacts removal methods based on convolutional neural network (CNN) have been developed with great success. However, these methods usually train a model based on one specific value or a small range of quality factors. Obviously, if the test image's quality factor does not match to the assumed value range, then degraded performance will be resulted. With this motivation and further consideration of practical usage, a highly robust compression artifacts removal network is proposed in this paper. Our proposed network is a single model approach that can be trained for handling a wide range of quality factors while consistently delivering superior or comparable image artifacts removal performance. To demonstrate, we focus on the JPEG compression with quality factors, ranging from 1 to 60. Note that a turnkey success of our proposed network lies in the novel utilization of the quantization tables as part of the training data. Furthermore, it has two branches in parallel---i.e., the restoration branch and the global branch. The former effectively removes the local artifacts, such as ringing artifacts removal. On the other hand, the latter extracts the global features of the entire image that provides highly instrumental image quality improvement, especially effective on dealing with the global artifacts, such as blocking, color shifting. Extensive experimental results performed on color and grayscale images have clearly demonstrated the effectiveness and efficacy of our proposed single-model approach on the removal of compression artifacts from the decoded image.