Filter for producing continuous tone images from halftone digita

Details Filter for producing continuous tone images from halftone digita Filter for producing continuous tone images from halftone digita

1998-03-23

2000-08-08

Lee, Thomas D.

Image analysis

Image enhancement or restoration

Image filter

382254, 358455, 358456, G06K 940, H04N 140

Patent

active

061012858

ABSTRACT:
A method and apparatus for processing halftone digital image data to generate a corresponding continuous tone image is disclosed. More specifically, the present invention discloses a method and apparatus for filtering a halftone image in two directions which enables images to be smoothed in the flat regions, while reducing smoothing along edges of the image and eliminating smoothing altogether in the ridges and valleys. This provides for a significant improvement in image quality without losing the fine details that are often lost using standard filtering techniques.

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patent: 5027078 (1991-06-01), Fan
patent: 5243444 (1993-09-01), Fan
patent: 5339170 (1994-08-01), Fan
patent: 5343309 (1994-08-01), Roetling
Micelli, C. M. and Parker, J. Inverse Halftoning, Journal of Electronic Imaging vol. 1, No. 2, pp. 143-151, Apr. 1992.
Schweizer, S. and Stevenson, R. Bayesian Approach to Inverse Halftoning, Proc. of SPIE Conf. on Human Vision, Vis. Proc. and Dig. Display IV, Proc. SPIE 1913, pp. 282-292, 1993.
Kim, Y., Arce, G. R. and Grabowski, N. Inverse Halftoning Using Binary Permutation Filters, Proc. IEEE Trans. Image Processing, vol. 4, pp. 1296-1311, Sep. 1995.
Chen, L. M. and Hang, H. M. An Adaptive Inverse Halftoning Algorithm, IEEE Trans. on Image Processing, vol. 6, No. 8, pp. 1202-1209, 1997.
Wong, P. W. Inverse Halftoning and Kernel Estimation for Error Diffusion, IEEE Trans. Image Processing, vol. 4, No. 4 pp. 486-498, Apr. 1995.

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