An effective edge-directed frequency filter for removal of aliasing in upsampled images

• Autorzy: Rataj A.
• Konferencja: International Conference on Computer Vision and Graphics ICCVG 2006 (25-27.09.2006 ; Warsaw, Poland)
• Języki publikacji: EN

Abstrakty

EN

Raster images can have a range of various distortions related to their raster structure. Their upsampling might in effect substantially reveal the raster structure of the original image, known as aliasing. The upsampling itself may introduce aliasing into the upsampled image as well. The presented method attempts to remove the aliasing using frequency filters based on discrete fast Fourier transform, and applied directionally in certain regions placed along the edges in the image. As opposed to some anisotropic smoothing methods, the presented algorithm aims to selectively reduce the aliasing only, preserving the sharpness of image details. The method can be used as a post-processing filter along with various upsampling algorithms. It was experimentally shown that the method can improve the visual quality of the upsampled images.

Słowa kluczowe

EN

aliasing; upsampling; frequency filter; edge detection

• Wydawca: Institute of Information Technology of the Warsaw University of Life Sciences – SGGW
• Czasopismo: Machine Graphics and Vision
• Rocznik: 2006
• Tom: Vol. 15, No. 3/4
• Strony: 585--598
• Opis fizyczny: Bibliogr. 14 poz., il., wykr.

Twórcy

autor

Rataj A.

• Institute of Theoretical and Applied Computer Science, Bałtycka 5, Gliwice, Poland

Bibliografia

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