Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1987-03-23
1988-06-21
Groody, James J.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358 75, 358283, G03F 308, H04N 140, H04N 146
Patent
active
047528222
ABSTRACT:
An image processing apparatus includes a generator for generating predetermined image data representing an image and an image reproducing device for reproducing the image. A reading device reads the image reproduced by the reproducing device and generates read data representative thereof. A converter converts the read data generated by the reading device to converted image data which is substantially equal to the predetermined image data generated by the generating device. The converting means includes a table adapted to receive the read data as address data for converting and outputting the converted image data. The converted image data may be transmitted to the reproducing device which is arranged to reproduce an image represented by either the predetermined image data or the converted image data. The image processing apparatus of the present invention may also incorporate a digitizer having a dither processing circuit for specifically processing data in accordance with a plurality of kinds of basic cells. Each cell has a number of threshold values and is of the same shape but has different arrangements of threshold values. The plurality of kinds of basic cells are alternately arranged in two perpendicular directions and are shifted relative to one another in row and column directions of the dither matrices by a and b respectively. The variables a and b represent displacements between the plural kinds of basic cells and each has a value other than zero. The dither matrix has a size N.times.N determined in accordance with the equation N=m(a+b) +n(a-b) where M and N are minimum values of integers and satisfy the equation M/N=(a+b)/a-b). In accordance with still a further feature of the present invention, the apparatus thereof may include an input device for inputting the image data as a plurality of bits. A first converter receives as an address the upper l bits of the image date in order to output converted image data and a second converter receives as an address the upper m bits of the image data in order to output converted data. Correcting means correct the converted image data by utilizing the converted data from the second converter and the lower n bits of the image data input by the input device.
REFERENCES:
patent: 3612753 (1971-10-01), Korman
patent: 3893166 (1975-07-01), Pugsley
patent: 4037249 (1977-07-01), Pugsley
patent: 4058828 (1977-11-01), Ladd
patent: 4075662 (1978-02-01), Gall
patent: 4270141 (1981-05-01), Sakamoto
patent: 4275413 (1981-06-01), Sakamoto et al.
patent: 4285009 (1981-08-01), Klopsch
patent: 4346402 (1982-08-01), Pugsley
patent: 4481532 (1984-11-01), Clark et al.
patent: 4507685 (1985-03-01), Kawamura
patent: 4511989 (1985-04-01), Sakamoto
patent: 4517605 (1985-05-01), Yokomizo
patent: 4534059 (1985-08-01), Yamada
patent: 4561016 (1985-12-01), Jung et al.
patent: 4626901 (1986-12-01), Tanioka
Stucki, P., "Electronic Halftoning for Color Reproduction", IBM Technical Disclosure Bulletin, vol. 20, No. 6, Nov. 1977, pp. 2423-2425.
Canon Kabushiki Kaisha
Groody James J.
Svihla Randall S.
LandOfFree
Color halftone image processing apparatus producing various scre does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Color halftone image processing apparatus producing various scre, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Color halftone image processing apparatus producing various scre will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-932205