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2018 | OriginalPaper | Buchkapitel

8. Image Upscaling

verfasst von : Dr. V. Ilia Safonov, Dr. V. Ilya Kurilin, Prof. Dr. N. Michael Rychagov, Dr. V. Ekaterina Tolstaya

Erschienen in: Adaptive Image Processing Algorithms for Printing

Verlag: Springer Singapore

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Abstract

In this chapter, we describe two upscaling methods for photo printers. They are both based on constructing an edge map and interpolating known image values along the edges, preserving the edge structure, and avoiding the appearance of artefacts. The interpolation process is followed by a post-processing stage, where edges are emphasized using a specially designed tone-mapping curve. The second algorithm uses structure tensor analysis to distinguish edges from textured areas and to find local structure direction vectors. The vectors are quantized into six directions. Individual adaptive interpolation kernels are used for each direction. The new methods provide high-resolution images with sharper edges, with quality higher than that obtained by bilinear interpolation, and require less computation than higher order bi-cubic methods.

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Metadaten
Titel
Image Upscaling
verfasst von
Dr. V. Ilia Safonov
Dr. V. Ilya Kurilin
Prof. Dr. N. Michael Rychagov
Dr. V. Ekaterina Tolstaya
Copyright-Jahr
2018
Verlag
Springer Singapore
DOI
https://doi.org/10.1007/978-981-10-6931-4_8

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