Digital halftoning
Digital halftones by dot diffusion
ACM Transactions on Graphics (TOG)
A simple and efficient error-diffusion algorithm
Proceedings of the 28th annual conference on Computer graphics and interactive techniques
Variants of Jump Flooding Algorithm for Computing Discrete Voronoi Diagrams
ISVD '07 Proceedings of the 4th International Symposium on Voronoi Diagrams in Science and Engineering
ACM SIGGRAPH 2008 papers
A robust technique for image descreening based on the wavelettransform
IEEE Transactions on Signal Processing
Inverse halftoning via MAP estimation
IEEE Transactions on Image Processing
Look-up table (LUT) method for inverse halftoning
IEEE Transactions on Image Processing
Restoration of error-diffused images using projection onto convex sets
IEEE Transactions on Image Processing
Tree-structured method for LUT inverse halftoning and for image halftoning
IEEE Transactions on Image Processing
Inverse halftoning algorithm using edge-based lookup table approach
IEEE Transactions on Image Processing
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We propose a blind inverse halftoning method with adaptive energy diffusion. A discrete Voronoi diagram is built by treating halftone dots as Voronoi cell sites. Gaussian filters are then created adaptively based on Voronoi cells and used for energy diffusion to form the grayscale inverse halftone image. We further perform a median filter on the Gaussian filters' parameters to maintain consistency of filters across different image regions. To remove artifacts in dense halftone dots area, we show that a secondary Voronoi diagram can be built based on the non-halftone dots and a heuristic blending can be employed. Comparing with other inverse halftoning methods, our method is able to remove artifacts in both sparse and dense halftone dots regions and produces visually pleasant gray-scale images. Our method is also applicable to edge enhancement and structure-aware halftoning.