Inverse halftoning process

Details Inverse halftoning process Inverse halftoning process

2007-06-05

2007-06-05

Bella, Matthew C. (Department: 2624)

Image analysis

Image enhancement or restoration

Image filter

C382S303000, C358S003080

Reexamination Certificate

active

09855292

ABSTRACT:
Performing inverse halftoning on a halftoned image includes smoothing the halftoned image using a two-dimensional filter to produce a smoothed image, detecting edge areas in the smoothed image, performing lowpass filtering on non-edge areas of the smoothed image, and generating an enhanced image comprised of the edge areas of the smoothed image and lowpass-filtered non-edge areas of the smoothed image.

REFERENCES:
patent: 5027078 (1991-06-01), Fan
patent: 5166810 (1992-11-01), Sorimachi et al.
patent: 5323247 (1994-06-01), Parker et al.
patent: 5333064 (1994-07-01), Seidner et al.
patent: 5343309 (1994-08-01), Roetling
patent: 5506699 (1996-04-01), Wong
patent: 5798846 (1998-08-01), Tretter
patent: 5850294 (1998-12-01), Apostolopoulos et al.
patent: 5852475 (1998-12-01), Gupta et al.
patent: 6201613 (2001-03-01), Zhang et al.
patent: 6229578 (2001-05-01), Acharya et al.
patent: 6621595 (2003-09-01), Fan et al.
patent: 6947178 (2005-09-01), Kuo et al.
patent: 03259193 (1991-11-01), None
Sato et al., Gary Scale Character Display Device, translation date of JP 03259193 A: Apr. 2004, publication date of JP 03259193 A: Nov. 19, 1991, JPO & Ralph Mcelroy Translation Company, pp. 4 and 6.
Damera-Venkata et al., Fast Blind Inverse Halftoning, Oct. 4-7, 1998, International Conference Image Processing, 1998, vol. 2, pp. 64-68.
Ting et al., “Error-Diffused Image Compression using a Binary-to-Gray-Scale Decoder and Predictive Pruned Tree-Structured Vector Quantization” IEEE Transactions on Image Processing, vol. 3, No. 6 (1994).
Hein et al., “Halftone to Continuous-Tone Conversion of Error-Diffusion Coded Images” IEEE Transactions on Image Processing, vol. 4, No. 2 (1995).
Kim et al., “Inverse Halftoning Using Binary Permutation Filters” IEEE Transactions on Image Processing, vol. 4, No. 9 (1995).
Wong “Inverse Halftoning and Kernel Estimation for Error Diffusion” IEEE Transactions on Image Processing, vol. 4, No. 4 (1995).
Xiong et al., “Inverse Halftoning Using Wavelets” Dept of Electrical Engineering, University of Hawaii, Honolulu, HI 96822 Dept of Electrical Engineering, Princeton University, 569-572.
Jarvis et al., “A Survey of Techniques for the Display of Continuous Tone Pictures on Bilevel Displays” Computer Graphics Image Processing 5: 13-40 (1976).
Gonzalez “Digital Image Processing” (Index) Addison Wesley, first edition, 1992.
Hamming “Digital Filters” (Index) Englewood Cliffs, NJ: Prentice-Hall, 1976.
Stevenson “Inverse Halftoning via MAP Estimation” IEEE Transactions on Image Processing vol. 6, No. 4 (1997).
Ostromoukhov, et al., “Multi-level Colour Halftoning Algorithms” Ecole Polytechnique Fédérale, Lausanne, Switzerland, SPIE 2949:332-340 (1996).
Floyd et al., “An adaptive algorithm for spatial grey scale”, Proc. Soc. Inf. Display, 17, pp. 75-77 (1976).
Eschbach et al., “Error-diffusion algorithm with edge enhancement ” JOSA (A) , (12):1844-1850, 1991.
Martins et al., “Halftone coding with JBIG2” Journal of Electronic Imaging 9(1), 52-60 (2000).

Affiliated with

Also associated with

Rating

Inverse halftoning process does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Inverse halftoning process, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Inverse halftoning process will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3870765