Image forming apparatus capable of converting the resolution

Details Image forming apparatus capable of converting the resolution Image forming apparatus capable of converting the resolution

1997-01-24

1998-06-09

Vu, Kim Yen

Image analysis

Image transformation or preprocessing

Changing the image coordinates

358448, 358462, 382176, H04N 140

Patent

active

057648166

ABSTRACT:
According to the image processing apparatus of the present invention, image data are entered with an input resolution of 16 dots/mm, yet allowing the use of a conventional image processing system with a resolution of 8 dots/mm, and there can be produced an image better in quality than a conventional one. First, pixel data with an input resolution of 16 dots/mm are subjected to resolution conversion using a resolution converting unit 21. The resolution conversion is made by an odd-numbered pixel thinning processing when the apparatus mode is set to a binary mode, and by a two pixel averaging processing when the apparatus mode is set to a half-tone mode. Then, pixel data of which resolution has been converted into 8 dots/mm, are supplied to an image processing unit 22, where an image processing is then executed on the pixel data.

REFERENCES:
patent: 4841375 (1989-06-01), Nakajima et al.
patent: 5327258 (1994-07-01), Ueda
patent: 5424854 (1995-06-01), Hashimoto
patent: 5517331 (1996-05-01), Murai et al.

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