| US 7,532,361 B2 | ||
| Image forming system, apparatus, and method | ||
| Kotaro Yano, Tokyo (Japan) | ||
| Assigned to Canon Kabushiki Kaisha, Tokyo (Japan) | ||
| Filed on Sep. 20, 2002, as Appl. No. 10/247,282. | ||
| Claims priority of application No. 2001-301217 (JP), filed on Sep. 28, 2001. | ||
| Prior Publication US 2003/0067638 A1, Apr. 10, 2003 | ||
| Int. Cl. G06K 15/00 (2006.01); H04N 1/405 (2006.01) | ||
| U.S. Cl. 358—3.05 [358/3.03; 358/3.06] | 10 Claims |
| 1. An image forming system for forming a subject image, which has been formed on a recording medium, and which is observed
by superposing an optical member which has a one-dimensional periodic structure, comprising:
image acquisition means for acquiring an image sequence of the subject image;
image synthesizing means for synthesizing a stripe image in such a manner that pixels having identical coordinates in each
image of the image sequence will be arrayed as adjacent pixels;
error diffusion quantization means for converting the stripe image to a multivalued image by reducing a number of tones through
the error diffusion method;
binarization means for converting the multivalued image to a binary dot pattern through a density pattern method; and
image forming means for forming the binary dot pattern on a recording medium,
wherein said binarization means switches among the plurality of dot patterns, which are the same level as each other, sequentially
in accordance with a pixel position, in the multivalued image, in a direction perpendicular to a direction of repetition of
the periodic structure of the optical member, so as to, when the optical member is superimposed, reduce occurrence of fringes
by shortening a period of a binary dot pattern in the direction of repetition of the periodic structure from a period of a
binary dot pattern in the direction perpendicular to the direction of repetition of the periodic structure, thereby converting
the multivalued image to a binary dot pattern.
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