图像超分辨率(SR)是提高图像分辨率的一类重要的图像处理技术以及计算机视觉中的视频。

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论文主题: Deep Learning for Image Super-resolution: A Survey

论文摘要: 图像超分辨率(SR)是提高图像分辨率的一类重要的图像处理技术以及计算机视觉中的视频。近年来,基于深度学习的图像超分辨率研究取得了显著进展技术。在这项调查中,我们旨在介绍利用深度学习的图像超分辨率技术的最新进展系统的方法。一般来说,我们可以粗略地将现有的SR技术研究分为三大类:监督SR、非监督SR和领域特定SR。此外,我们还讨论了一些其他重要问题,如公开可用的基准数据集和性能评估指标。最后,我们通过强调几个未来来结束这项调查未来社区应进一步解决的方向和公开问题.

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Super-resolution (SR) is a coveted image processing technique for mobile apps ranging from the basic camera apps to mobile health. Existing SR algorithms rely on deep learning models with significant memory requirements, so they have yet to be deployed on mobile devices and instead operate in the cloud to achieve feasible inference time. This shortcoming prevents existing SR methods from being used in applications that require near real-time latency. In this work, we demonstrate state-of-the-art latency and accuracy for on-device super-resolution using a novel hybrid architecture called SplitSR and a novel lightweight residual block called SplitSRBlock. The SplitSRBlock supports channel-splitting, allowing the residual blocks to retain spatial information while reducing the computation in the channel dimension. SplitSR has a hybrid design consisting of standard convolutional blocks and lightweight residual blocks, allowing people to tune SplitSR for their computational budget. We evaluate our system on a low-end ARM CPU, demonstrating both higher accuracy and up to 5 times faster inference than previous approaches. We then deploy our model onto a smartphone in an app called ZoomSR to demonstrate the first-ever instance of on-device, deep learning-based SR. We conducted a user study with 15 participants to have them assess the perceived quality of images that were post-processed by SplitSR. Relative to bilinear interpolation -- the existing standard for on-device SR -- participants showed a statistically significant preference when looking at both images (Z=-9.270, p<0.01) and text (Z=-6.486, p<0.01).

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