Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Reexamination Certificate
1994-09-12
2001-08-14
Lee, Thomas D. (Department: 2624)
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
C358S448000, C348S441000, C348S445000
Reexamination Certificate
active
06275306
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an image processing system, and more particularly to an image processing system for processing video signals.
2. Description of Related Art
Video printing is already known for printing a television image. Particularly the video printing from the conventional television system with 525 scanning lines is utilized as very useful means for printing decisive moments in news or sports programs.
In recent sports events or the like, video records are the often only available records, so that the role of video printing has become more and more important. Particularly the image of high definition television (HDTV) will significantly improve the image quality of video printing, and will evidently expand the application of the video printing. For example, high definition television has a resolving power of 1920×1035 points and can provide a high-quality image on a print up to A4 size.
However, in case of handling the image signal of the conventional high definition television in the form a digital signal, the vertical-to-horizontal ratio of each pixel is not 1:1 (square) but each pixel has a somewhat oblong rectangular shape which, for example, corresponds to the proposed standard of BTA (Broadcasting Technology Development Association). Consequently, if such data, in which the vertical-to-horizontal ratio of each pixel is not 1:1, are supplied to a printing apparatus or the like designed to process data with square pixels, a distorted image will result because the aspect ratio of the printed image is different from that of the original image.
Also similar image distortion will be encountered when a video signal of 1:1 aspect ratio, generated in an image reading unit such as a scanner, is supplied to a BTA-standard equipment such as a digital video cassette recorder.
Furthermore, the sampling frequency of 74.25 MHz employed in the high definition signal is primarily designed for use in the broadcasting studio. Since the amount of image data becomes enormous at such a sampling frequency, the frequency is generally reduced, in the usual professional and amateur appliances, to a level that can maintain tolerable image quality. For example, a sampling frequency of 48.6 MHz is employed in a so-called MUSE system. However each pixel is not square even at such a sampling frequency, such that the above-explained aspect ratio difficulty is still encountered.
SUMMARY OF THE INVENTION
An object of the present invention is to provide an image processing system without the drawbacks mentioned above.
Another object of the present invention is to provide an image processing system capable of providing a satisfactory image even if the aspect ratios of the printer and the image input apparatus are mutually different, that is, different relative to one another.
The foregoing objects can be attained, according to a preferred embodiment of the present invention, by an image processing system provided with input or output means for inputting or outputting a video signal, and a scanner for reading an original image or a printer for forming the image of the video signal, wherein the aspect ratio of the image is converted at the transfer of the video signal between said input or output means and said scanner or printer.
Still another object of the present invention is to provide an image processing system capable of providing a satisfactory image with a simple structure, even when the aspect ratios of the printer and the image input apparatus are mutually different.
Still another object of the present invention is to provide an image processing system capable of varying the aspect ratio of the image of the printer or the image input apparatus without the use of a particular device for converting the amount of data.
Still another object of the present invention is to provide an apparatus capable of satisfactorily printing an image signal matching the standard of high definition television.
Still other objects of the present invention, and the features thereof, will become fully apparent from the following description of several embodiments, which is to be taken in conjunction with the attached drawings.
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Kaneko Yushi
Suzuki Yasutomo
Wataya Masafumi
Yanaka Toshiyuki
Canon Kabushiki Kaisha
Fitzpatrick ,Cella, Harper & Scinto
Lee Thomas D.
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