Fast blind inverse halftoning
Damera-Venkata, N.; Kite, T.D.; Venkataraman, M.; Evans, B.L.
Image Processing, 1998. ICIP 98. Proceedings. 1998 International Conference on
Volume 2, Issue , 4-7 Oct 1998 Page(s):64 - 68 vol.2
Digital Object Identifier 10.1109/ICIP.1998.723318
Summary:We present a fast, non-iterative technique for producing grayscale
images from error diffused and dithered halftones. The first stage of
the algorithm consists of a Gaussian filter and a median filter, while
the second stage consists of a bandpass filter, a thresholding
operation, and a median filter. The second stage enhances the rendering
of edges in the inverse halftone. We compare our algorithm to the best
reported statistical smoothing, wavelet, and Bayesian algorithms to show
that it delivers comparable PSNR and subjective quality at a fraction of
the computation and memory requirements. For error diffused halftones,
our technique is seven times faster than the MAP estimation method and
75 times faster than the wavelet method. For dithered halftones, our
technique is 200 times faster than the MAP estimation method. A C
implementation of the algorithm is available
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