Facsimile and static presentation processing – Static presentation processing – Size – resolution – or scale control
Reexamination Certificate
1998-02-02
2001-08-07
Lee, Thomas D. (Department: 2724)
Facsimile and static presentation processing
Static presentation processing
Size, resolution, or scale control
C358S451000, C382S298000
Reexamination Certificate
active
06271933
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to an image reading apparatus.
2. Related Background Art
In case of reading an image on an original by a copying apparatus, a facsimile apparatus, or an image reading apparatus such as an image scanner or the like, there is an apparatus having a function to variably magnify (zoom, namely, enlarge or reduce) a size of image to be read. In case of zooming an image by such an image reading apparatus, such a zoom processing is accomplished by changing a reading main scanning speed at which an image reading unit for optically reading an original is relatively moved for the original.
However, in order to read the original image at a low resolution by using an image scanner having a high reading resolution, it is necessary to scan an optical system at a very high speed for the original. To move the optical system at a high speed as mentioned above, a long approach run distance is needed, resulting in an enlargement in size of the apparatus. When a motor is operated at a high speed, since the vibration increases, it becomes a factor of deterioration of an image quality such as fluctuation of the image or the like. Further, a high speed and expensive driving motor is also necessary.
SUMMARY OF THE INVENTION
It is an object of the invention to provide an image reading apparatus which can properly zoom an image.
Another object of the invention is to provide an image reading apparatus which can properly convert a pixel density.
According to an embodiment of the invention, there is provided an image reading apparatus comprising: reading means for reading an image; first magnifying means for changing a magnification of the image; second magnifying means for changing the magnification of the image by a method different from that of the first magnifying means; and selecting means for selecting either one of the first and second magnifying means.
With such a construction, the image can be properly zoomed.
According to another embodiment of the invention, there is provided an image reading apparatus comprising: reading means for reading an image; first density converting means for changing a pixel density per unit area of the image; second density converting means for changing a pixel density per unit area of the image by a method different from that of the first density converting means; and selecting means for selecting either one of the first and second density converting means.
With such a construction, the pixel density of the image can be properly converted.
The above and other objects and features of the present invention will become apparent from the following detailed description and the appended claims with reference to the accompanying drawings.
REFERENCES:
patent: 4771473 (1988-09-01), Sugiura
patent: 4905096 (1990-02-01), Moriya
patent: 4969051 (1990-11-01), Sasaki
patent: 5703729 (1997-12-01), Takeda et al.
Asai Hidehiko
Kaneko Satoshi
Kuboki Keiju
Kutsuwada Satoru
Canon Kabushiki Kaisha
Fitzpatrick ,Cella, Harper & Scinto
Lee Thomas D.
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