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This study proposes a method which can generate high quality inverse halftone images from halftone images. This method can be employed prior to any signal processing over a halftone image or the inverse halftoning used in JBIG2. The proposed method utilizes the least-mean-square (LMS) algorithm to establish a relationship between the current processing position and its corresponding neighboring positions...
This study presents two predicted-based watermarking schemes, namely ahead AC-predicted watermarking (AAPW) and post AC-predicted watermarking (PAPW), by embedding information into low frequency AC coefficients of discrete cosine transform (DCT). The proposed methods utilize the DC values of the neighboring blocks to predict the AC coefficients of the center block. The low frequency AC coefficients...
Inverse halftoning is a key technology to yield a continuous tone image from a halftone image. The main application is to make some image enhancement or further compression of halftones more feasible. Many former approaches have been proposed in the literature. Among these, a recent method proposed by Chung and Wu using edge-based lookup table achieves good image quality, where the edge feature is...
In this work, a high quality halftone image obtained by dot diffusion is proposed to reduce the deficiency gap with the error diffusion. Four kinds of filters with various sizes obtained by least-mean-square (LMS) are also introduced to simulate the human visual system (HVS). These filters are employed in the optimization procedures for class matrix of size 8x8. According to numerous of simulations,...
An improved data hiding in halftone images with cooperating pair toggling human visual system (PTHVS) is presented in this paper. An objective halftone image quality evaluation method based on the human visual system obtained by least-mean-square (LMS) is also introduced. By rigorously searching the optimum toggled pixels with the proposed human visual LMS-trained filter, the proposed method is proven...
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