JPH0476595A - Image display device - Google Patents

Abstract

PURPOSE:To make an easy-to-see display even if an image has high brightness or is in a complicate shape by generating data by deflecting the output of a graphic memory vertically and horizontally and masking the output of an image memory. CONSTITUTION:Assuming that character data shown by (a) are stored in the graphic memory 1, mask data 6 generated by a mask data generator 5 is (b) and when the image data is denoted as (c), a video signal 10 for display (d) is outputted. Namely, a mask processor output 8 is obtained by processing the mask data 6 shown by (b) and image data 4 shown by (c) by a mask processor 7 and the reverse image data of the image data (b) is the mask processor output 8. Then a video signal converter 9 superposes the reverse image data of the image data (b) upon character and pattern data 2 shown by (a) again to output a video signal 10 shown by (d).

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an image display device, and more particularly to an image display device that displays multi-gradation images, characters, and graphics in a superimposed manner on the same screen.

[Conventional technology]

Conventionally, this type of image display device has either simply superimposed characters and figures on a multi-tone image, inverted the black and white of the characters and figures that overlap with the part of the multi-tone image where the value is greater than a predetermined value, or The brightness of the figure was displayed higher than the maximum brightness of the multi-tone image.

[Problem to be solved by the invention]

The conventional image display device described above either simply superimposes characters and figures on a multi-tone image, inverts the black and white of characters and figures that overlap with the portion of the multi-tone image where the value is greater than a predetermined value, or displays the characters and figures. Since the display is performed in such a way that the brightness of the image is higher than the maximum brightness of the multi-tone image, if the brightness of the multi-tone image is high, the brightness difference between the characters and figures will be small, and the shape of the multi-tone image will be If it is complicated, the brightness of characters and figures may change in a complicated manner, making it difficult to see.

[Means to solve the problem]

The image display device of the present invention includes: a graphic memory that stores character and graphic data;
an image memory for storing multi-gradation image data; a mask data creator for creating data in which the output from the graphic memory is distributed vertically and horizontally; and an output from the image memory based on the output of the mask data creator. and a mask processor for masking.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a diagram showing the configuration of an embodiment of the present invention.

In FIG. 1, 1 is a graphic memory, 3 is an image memory, 5 is a mask data generator, 7 is a mask processor, 9
is a video signal converter.

The mask data creator 5 creates mask data 6 by shaking the character/figure data 2 read from the graphic memory 1 vertically and horizontally. The mask processor 7 performs a process of masking the image data 4 output from the image memory 3 with mask data 6. The character/graphic data 2 and the mask processing capacity output 8 are converted into a video signal 10 by a video signal converter 9.
is converted and output.

In the above configuration, if the character data shown in FIG. 2(a) is now stored in the graphic memory 1, the mask data 6 created by the mask data creator 5 will be
If the image data 4 is as shown in FIG. 2(c), a video signal 10 having a display as shown in FIG. 2(d) is output. That is, the mask processing performance output 8 is obtained by processing the mask data 6 shown in FIG. 2(b) and the image data 4 shown in FIG. 2(c) in the mask processor 7, and The inverted image data of the image data in (b) becomes the mask processing ability output 8. Then, the video signal converter 9 superimposes the inverted image data of the image data in FIG. 2(b) on the character/figure data 2 shown in FIG. 2(a) again, resulting in a video signal shown in FIG. 2(d). 10 is output.

〔Effect of the invention〕

As explained above, the present invention creates mask data by shaking the character/figure data output from the graphic memory in the vertical and horizontal directions, and masks the output of the image memory with the mask data. Since the image surrounding the figure is masked and the text or figure is displayed with a border, there is an advantage that even if the image is of high brightness or has a complex shape, it can be displayed in an easy-to-read manner.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, and FIGS. 2(a) to 2(d) are explanatory diagrams explaining the operation of FIG. 1. 1...Graphic memory, 2...Character/graphic data, 3...Image memory, 4...Image data, 5...
・Mask data generator, 6...Mask data, 7...
・Mask processor, 8...Mask processing capacity output, 9...
Video signal converter, 10... video signal.

Claims (1)

[Claims] a graphic memory that stores character and graphic data;
an image memory that stores multi-gradation surface image data; a mask data creator that creates data by distributing the output from the graphic memory in vertical and horizontal directions; and an output of the image memory based on the output of the mask data creator. 1. An image display device comprising: a mask processor for masking.