Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1997-06-17
2000-08-08
Rogers, Scott
Facsimile and static presentation processing
Static presentation processing
Attribute control
358456, 358458, 358462, H04N 1405
Patent
active
061009970
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates generally to processing of a binary image consisting of binary pixels as in the case of a character font image and, more particularly, to an image half-tone processor for expressing the binary image as a multi-gradated image containing half-tones and capable of providing a comparatively easy-to-see display or print, etc. for an output dot density.
BACKGROUND ARTS
In recent years, there has increasingly been a rapid enhancement in terms of MMI (Man-Machine Interface) owing to an advancement in GUI (Graphical User Interface) in computers. Corresponding to such a trend, there increases an occasion in which the image data containing the images and characters are displayed in a variety of sizes, or printed by a printer, etc. and outputted.
On the other hand, with a diversification of the display information, a prevailing type of display device is, though low of its resolution in a so-called monochrome display, capable of displaying with multi-gradations. For example, the great majority of liquid crystal display devices exhibiting a low resolution are capable of 8- or 16-gradation display containing half-tones in addition to two gradations in black and white.
By the way, a comparatively inexpensive output device, especially a small-sized display device is generally low of the resolution and tends to be hard to see enough to worsen a visual recognizability because of an image the outline of which becomes conspicuous of sharp ruggedness when displaying binary image data consisting of rather definite binary data. A more remarkable tendency of this sort can be seen in the liquid crystal display often used for particularly a carriable type appliance such as a so-called notebook type personal computer because of rectangular dots being uniform in terms of display dots.
When outputting letter, i.e., characters having the same logic size (e.g., 10.5 point) to a display device and a printer that are defined as outputting devices, a letter image, viz., a character image actually displayed on the display device and a character image printed by the printer are expressed with different numbers of dots on account of a difference in resolution between the outputting devices. Therefore, the display device generally exhibiting a lower resolution than the printer comes to display a conspicuously rugged rough image of the character.
It is an object of the present invention, which was contrived under such circumstances, to provide an image half-tone processor capable of giving an easy-to-see display with a high visual recognizability by converting a primary binary image (an original binary image) into a multi-gradated image and outputting the image based on the multi-gradation expression in a system for outputting the binary image by use of an outputting device possible of expressing it with the multi-gradations containing half-tones.
DISCLOSURE OF INVENTION
A first image half-tone processor according to the present invention comprises a pixel converting unit for weighting each of pixels of a primary binary image, and converting the primary binary image into a multivalued image consisting of weighted pixel values, a shift inversion processing unit for forming respectively a plurality of shift-inverted images into which the primary binary image is inverted and shifted in a plurality of peripheral directions corresponding to a pixel array of the primary binary image, a gradation processing unit for forming a half-tone image on the basis of the multivalued image obtained by the pixel converting unit and the plurality of shift-inverted images obtained by the shift inversion processing unit, and an image outputting device for outputting the half-tone image formed by the gradation processing unit.
The shift inversion processing unit may be a unit for forming respectively four shift-inverted images into which the primary binary image is inverted and shifted in upper-, lower-, left- and right-directions, and the gradation processing unit may be a unit for forming a half-tone image on the
REFERENCES:
Partial European Search Report dated Jan. 28, 1999.
Fujitsu Limited
Rogers Scott
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