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arxiv 1803.02077 v4 pith:N5T64PCT submitted 2018-03-06 cs.CV cs.LG

The Contextual Loss for Image Transformation with Non-Aligned Data

classification cs.CV cs.LG
keywords imagelossalignedcontextfunctionsimagesproblemstransformation
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Feed-forward CNNs trained for image transformation problems rely on loss functions that measure the similarity between the generated image and a target image. Most of the common loss functions assume that these images are spatially aligned and compare pixels at corresponding locations. However, for many tasks, aligned training pairs of images will not be available. We present an alternative loss function that does not require alignment, thus providing an effective and simple solution for a new space of problems. Our loss is based on both context and semantics -- it compares regions with similar semantic meaning, while considering the context of the entire image. Hence, for example, when transferring the style of one face to another, it will translate eyes-to-eyes and mouth-to-mouth. Our code can be found at https://www.github.com/roimehrez/contextualLoss

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