Inverse halftoning via MAP estimation
IEEE Transactions on Image Processing
A fast, high-quality inverse halftoning algorithm for error diffused halftones
IEEE Transactions on Image Processing
Hybrid LMS-MMSE inverse halftoning technique
IEEE Transactions on Image Processing
Look-up table (LUT) method for inverse halftoning
IEEE Transactions on Image Processing
Inverse halftoning algorithm using edge-based lookup table approach
IEEE Transactions on Image Processing
Halftone to continuous-tone conversion of error-diffusion coded images
IEEE Transactions on Image Processing
Inverse halftoning and kernel estimation for error diffusion
IEEE Transactions on Image Processing
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A new inverse halftoning algorithm based on reversible data hiding techniques for halftone images is proposed in this paper. The proposed scheme has the advantages of two commonly used methods, the lookup table (LUT) and Gaussian filtering methods. We embed a part of important LUT templates into a halftone image and restore the lossless image after these templates have been extracted. Then a hybrid method is performed to reconstruct a grayscale image from the halftone image. In the image reconstruction process, the halftone image is scanned pixel by pixel. If the scanned pattern surrounding a pixel appeared in the LUT templates, a gray value is directly predicted using the LUT value; otherwise, it is predicted using Gaussian filtering. Experimental results show that the reconstructed grayscale images using the proposed scheme own better quality than both the LUT and Gaussian filtering methods.