Perceptual Losses for Real-Time Style Transfer and Super-Resolution Perceptual Losses for Real-Time Style Transfer and Super-Resolution
Paper summary This paper proposes the use of pretrained convolutional neural networks that have already learned to encode semantic information as loss functions for training networks for style transfer and super-resolution. The trained networks corresponding to selected style images are capable of performing style transfer for any content image with a single forward pass (as opposed to explicit optimization over output image) achieving as high as 1000x speedup and similar qualitative results as Gatys et al. Key contributions: - Image transformation network - Convolutional neural network with residual blocks and strided & fractionally-strided convolutions for in-network downsampling and upsampling. - Output is the same size as input image, but rather than training the network with a per-pixel loss, it is trained with a feature reconstruction perceptual loss. - Loss network - VGG-16 with frozen weights - Feature reconstruction loss: Euclidean distance between feature representations - Style reconstruction loss: Frobenius norm of the difference between Gram matrices, performed over a set of layers. - Experiments - Similar objective values and qualitative results as explicit optimization over image as in Gatys et al for style transfer - For single-image super-resolution, feature reconstruction loss reconstructs fine details better and 'looks' better than a per-pixel loss, even though PSNR values indicate otherwise. Respectable results in comparison to SRCNN. ## Weaknesses / Notes - Although fast, limited by styles at test-time (as opposed to iterative optimizer that is limited by speed and not styles). Ideally, there should be a way to feed in style and content images, and do style transfer with a single forward pass.
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Perceptual Losses for Real-Time Style Transfer and Super-Resolution
Johnson, Justin and Alahi, Alexandre and Fei-Fei, Li
European Conference on Computer Vision - 2016 via Local Bibsonomy
Keywords: dblp


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