Abstract
Halftoning is a technique in which gray-scale images are converted into binary ones, and has been used widely in many practical image processing applications. On the other hand, inverse halftoning is a technique of reproducing a grayscale image from a binary one. One of the sophisticated inverse halftoning methods which can yield a high quality grayscale image is that based on a look-up table (LUT). In this paper, a new inverse halftoning method based on a combination of this LUT method and a Gaussian filter is discussed. Here, the output gray-scale image is reproduced by blending the output of the LUT-based inverse halftoning and that of the Gaussian filtering appropriately in accordance with local statistics of the image. The effectiveness and the validity of the described method are verified through experiments.
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Suetake, N., Tanaka, G. & Uchino, E. Look-up table and Gaussian filter-based inverse halftoning method excellent in gray-scale reproducibility of details and flat regions. OPT REV 16, 594–600 (2009). https://doi.org/10.1007/s10043-009-0117-1
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DOI: https://doi.org/10.1007/s10043-009-0117-1