“Spectral remapping for image downscaling” by Gastal and Oliveira

  • ©Eduardo Simões Lopes Gastal and Manuel M. Oliveira




    Spectral remapping for image downscaling

Session/Category Title: Image and Light Field Manipulation




    We present an image downscaling technique capable of appropriately representing high-frequency structured patterns. Our method breaks conventional wisdom in sampling theory—instead of discarding high-frequency information to avoid aliasing, it controls aliasing by remapping such information to the representable range of the downsampled spectrum. The resulting images provide more faithful representations of their original counterparts, retaining visually-important details that would otherwise be lost. Our technique can be used with any resampling method and works for both natural and synthetic images. We demonstrate its effectiveness on a large number of images downscaled in combination with various resampling strategies. By providing an alternative solution for a long-standing problem, our method opens up new possibilities for image processing.


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