JPS6371886A - Image synthesizer/display device - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The invention relates to a display device that synthesizes and displays an image output from an image device and a character image, and particularly relates to image synthesis that facilitates the identification of character images. Related to display devices.

[Conventional technology]

Regarding image synthesis and display devices that synthesize and display character images and other images, the conventional device is disclosed in Japanese Patent Application Laid-Open No. 60-75876.
As described in JP-A-60-95485 and Japanese Patent Application Laid-open No. 60-95485, a shading display is created using the character image as a reference and added to the character image as a means of easily identifying characters on the composite #J. I had a method.

[Problems to be Solved by the Invention] In the above-mentioned prior art, the shading for the characters was created with the character image as a reference and in a time-delayed direction from this image. Shadows were formed only in the direction, and no consideration was given to forming shadows on the left side of the characters.

For this reason, when the background image/image to which a character image is to be synthesized is a complex image such as a television picture, there is still the problem that it is difficult to identify the characters.

An object of the present invention is to form shading not only on the right side of characters but also on the left side of characters, so that characters can be easily identified even if the background image on which a character image is to be synthesized is a complex image. It's about doing.

[Means for solving problems]

- The above purpose is to create shadow image signals for the left and right sides of characters, create character image signals simultaneously and in parallel based on these shadow image signals, control background image signals to be synthesized using the shadow image signals, and This is achieved by combining the character image signal with the character image signal.

[Effect]

A character shading image signal is first created, and a character image signal is simultaneously created using this shading image signal as a reference. and,
By using the shadow image signal as a switching signal between the character image signal and the background image signal, the background image signal 'fj! : It is possible to delete within the range of the shadow image, and the inside of the shadow image can be used as a display area that is not affected by the background art. By synthetically displaying a character image smaller than the size of this area within this shaded image area, it becomes possible to make the left and right sides of the character a shaded image.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic block diagram of the art world synthesis display device according to the present invention, FIG. 2 is a timing diagram of main signals, and FIG. 3 is a character recorded in the character shading pattern generator 7. This is an example of a pattern.

In FIG. 1, an image signal 12 is output from an art stage device 1 and input to a video switch 2. In the video switch 2, a character image is synthesized with the image signal 12 to form a composite image signal 13, which is input to the display 3 and displayed. The character to be synthesized [fN翿] is generated by the timing generator 4. Scanning line address counter 51 Display information menu 61 Character shading pattern generator 7. Parallel-serial converter 8. 1)”t delay circuit 9. OR gate 1o
and AND gate 11.

The timing generator 4 outputs a character dot timing signal 14, a scanning line timing signal 15. and character timing signal 16 are output. The scanning line timing signal 15 is input to the scanning line address counter 5, and the character timing signal 16 is input to the display information memory 6. Scan line address counter5. A scanning line address signal 1 and a display character address signal 18 corresponding to the timing of the scanning line are output from the display information memory 6 and input to the character shading pattern generator 7. As a result, character shading pattern information 19 corresponding to the scanning line address signal 1 and display character address signal 18 is output from the character shading pattern generator 7.
is output, which is converted into a serial signal by the parallel-serial converter 8 in response to the character dot timing signal 14, and is output. This output is a one-dot delay circuit 9
A one-dot delay signal 21 is created. The character pattern signal 20 and the one-dot delay signal 21, which are the output signals of the serial-parallel converter 8, are input to the OR gate 10, and this output becomes the switching signal 22, which is input to the video switch 2, and the image signal 12 and the character image signal are input to the OR gate 10. This is a signal that controls the switching of 25. On the other hand, the character pattern signal 20 and the one-dot delay signal 21 are simultaneously input to the AND gate 11, and the output thereof becomes a character image signal 23, which is input to the video switch 2.

In the video switch 2, as shown in FIG. 2, when the switching signal 22 is valid, the image signal 12 is cut off and the character image signal 23 is output, and conversely, when the switching signal 22 is invalid, the character image signal 23 is output. The signal 23 is cut off and the image signal 12 is output. As a result, the character image signal 23 is combined with the image signal 12 to form a composite image signal 13.

At this time, the character shading pattern generator 7 records a character pattern such as the example shown in FIG. 3, and a pattern including the left side shading of the character. By combining this pattern and a pattern delayed by one dot, it is possible to add shading to the left and right sides of the character.

〔Effect of the invention〕

According to the present invention, it is possible to form an image that is combined with another image with shading added to the left and right nine sides of a character image, so even when the image to be combined is a complex image such as a TV show image, This also has the effect of making it easier to identify the characters.

Further, in the device configuration for realizing the above effect, it is not necessary to add a complicated logic circuit, and there is an effect that shading can be easily added to a character image.

Claims (1)

[Claims] 1. In a display device that combines and displays an image output from an image device and a character image, a mechanism for generating a character shading pattern and a mechanism for generating a character pattern signal based on the shading pattern signal are provided, Accordingly, an image synthesis display device is provided with a function of adding shading to the left and right sides of a character image.