arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1804.04593cs.CV
收藏

变形感知图像压缩

Deformation Aware Image Compression

Technion—Israel Institute of Technology(以色列理工学院)

Tamar Rott Shaham, Tomer Michaeli

摘要:

有损压缩算法旨在以能够以最小误差恢复图像的方式对图像进行压缩编码。我们发现,现有算法的一个关键限制是,它们依赖于对几何变形(例如SSD,SSIM)非常敏感的误差测量。这迫使编码器投入许多比特来描述图像中每一个细节的精确几何形状,这显然是浪费的,因为人类视觉系统对小的局部平移漠不关心。出于这种观察,我们提出了一个变形不敏感的误差测量,可以很容易地纳入任何现有的压缩方案。正如我们所示,在我们的标准下,最佳压缩涉及轻微变形的输入图像,使其变得更加“可压缩”。令人惊讶的是,虽然这些微小的变形几乎不明显,但它们使编解码器能够保留否则完全丢失的细节。我们的技术使用的编解码器作为一个“黑盒子”,从而允许简单的集成与任意的压缩方法。广泛的实验,包括用户研究,证实我们的方法显着提高了许多编解码器的视觉质量。这些方法包括JPEG,JPEG 2000,WebP,BPG和最近的深网方法。

英文摘要:

Lossy compression algorithms aim to compactly encode images in a way which enables to restore them with minimal error. We show that a key limitation of existing algorithms is that they rely on error measures that are extremely sensitive to geometric deformations (e.g. SSD, SSIM). These force the encoder to invest many bits in describing the exact geometry of every fine detail in the image, which is obviously wasteful, because the human visual system is indifferent to small local translations. Motivated by this observation, we propose a deformation-insensitive error measure that can be easily incorporated into any existing compression scheme. As we show, optimal compression under our criterion involves slightly deforming the input image such that it becomes more "compressible". Surprisingly, while these small deformations are barely noticeable, they enable the CODEC to preserve details that are otherwise completely lost. Our technique uses the CODEC as a "black box", thus allowing simple integration with arbitrary compression methods. Extensive experiments, including user studies, confirm that our approach significantly improves the visual quality of many CODECs. These include JPEG, JPEG2000, WebP, BPG, and a recent deep-net method.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑