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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Safonov, V.I., Kurilin, V.I., Rychagov, N.M., Tolstaya, V.E. (2018). Image Upscaling. In: Adaptive Image Processing Algorithms for Printing. Signals and Communication Technology. Springer, Singapore. https://doi.org/10.1007/978-981-10-6931-4_8
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DOI: https://doi.org/10.1007/978-981-10-6931-4_8
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