Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1988-07-13
1990-05-08
Chin, Tommy P.
Facsimile and static presentation processing
Static presentation processing
Attribute control
340703, 340729, 340734, H04N 976, G09G 128
Patent
active
049242997
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an image display apparatus displaying a composite image of a character image and a graphic image in color.
BACKGROUND ART
In an image display apparatus displaying a composite color picture on a display device by mixing a character (letter) picture and a graphic (figure) picture, the existence of color factors (e.g., three primary colors: red, green, blue) constituting each pixel is expressed by a logical value "1", and a nonexistence is expressed by "0", color factors showing a character picture and color factors showing a graphic picture, pixels which corresponding to each other on the pictures are logically summed using logical summation circuits, and the summation is a logical value showing an existence of the color factor of the composite picture. As a result, a superposed composite image of the character picture and the graphic picture is obtained, the character and the graph having colors are superposed, and thus the colors are additively mixed. Since this apparatus uses the logical summation circuits as hardware, an advantage exists of a simple circuit constitution, but a problem arises in that distinction of the character becomes difficult when the character is superposed onto a complicated figure having many colors.
DISCLOSURE OF THE INVENTION
An object of the present invention is to provide an image display apparatus wherein a color display of a character image has priority over a color display of a graphic image, the color of the character image is not easily affected by the color of the superposed graphic image, and the character image can be easily distinguished from the background image thereof.
To solve the above-mentioned problem, in the present invention, there is provided an image display apparatus wherein an existence of a plurality of color factors which constitute pixels of a character image and a graphic image which have corresponding pixels is expressed by a logical value notation, the logical values of the color factors of the character image and the graphic image for the corresponding pixels are operated logically, and the composite image consisting of the character image and the graphic image is displayed, comprising a logical operation circuit in which, when at least one color factor of the character image exists for the pixels, not all the color factors of the graphic image for the pixels are displayed. By using the above-mentioned apparatus according to the invention, the letter of the character image is displayed on the composite image without a color change, and thus the letter can be displayed distinctively since the color of the figure of the graphic image does not affect the color of the letter.
BRIEF EXPLANATION OF THE DRAWINGS
FIG. 1 is a diagram explaining the present invention;
FIG. 2 is a diagram showing a logical operation circuit of an image display apparatus according to an embodiment of the invention;
FIG. 3 is a circuit diagram showing a logical operation circuit in another embodiment of the invention; and
FIG. 4 is a diagram explaining a conventional apparatus.
BEST MODE FOR CARRYING OUT THE INVENTION
An apparatus of the invention, as shown in FIG. 1, for example, a character on a character picture (CHR. PICT.) 1 is displayed on a composite picture (COMP. PICT.) 3 while the color thereof is maintained as is, and displays a graphic figure in color, as shown by a graphic picture (GRA. PICT.) 2, by oblique lines so that the color of the graphic figure does not affect the color of the character. In FIG. 1, the character of the composite picture is shown as white for convenience due to a monochromatic expression. In an embodiment of the present invention, when a color of a character on a character picture is the same as a color of the corresponding pixel of a figure on a graphic picture, the color of the character is made black.
FIG. 2 shows a logical operation circuit for forming a composite image signal by mixing a character image signal and a graphic image signal in an image display apparatus according
REFERENCES:
patent: 4827251 (1989-05-01), Aoki
Mizuno Yutaka
Takamuku Hideyuki
Chin Tommy P.
Fanuc Ltd.
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