CN1155818A

CN1155818A - Image processing method at time of character display in image apparatus

Info

Publication number: CN1155818A
Application number: CN 96114413
Authority: CN
Inventors: 吉田升
Original assignee: Funai Electric Co Ltd
Current assignee: Funai Electric Co Ltd
Priority date: 1995-11-02
Filing date: 1996-11-02
Publication date: 1997-07-30

Abstract

An image processing method at the time of character display in an image apparatus having a section for super-imposing character display on an ordinary dynamic picture image. In the method, the level of 'color depth' of the dynamic picture image is automatically controlled at the time of character display to thereby make it easy to see character display. Specifically, when character display is effected in monochrome, the dynamic picture image is displayed in a color other than monochrome. When character display is effected in a color other than monochrome, the dynamic picture image is displayed in monochrome.

Description

Image processing method when character shows in imaging device

The present invention relates to the image processing method when character shows in imaging device, this imaging device has display unit, such as cathode ray tube (CRT), and LCD (LCD) or plasma display, can show R-G-B (RGB) signal, vision signal or their composite signal thereon.Imaging device has constituted television receiver, videograph/replay device, and terminal, or communication terminal device is whole or a part of.

So far,, a kind of method is arranged, wherein character is shown to overlap whole scribble (demonstration scribbles monochromatic screen) on the monochromatic screen, in addition, also have a kind of method, produce than font signal than Zao signal and slower signal for the character demonstration.Thereby (see the clear 56-51676 of Japanese patent of invention No., exercise question is: the profile cancellation element of character signal) to carry out edged around font.

In the method, whole screen is coated monochrome, yet the shortcoming that produces is can not see dynamic image at all.

On the other hand, carry out in the method on picture limit in the periphery of font, the shortcoming of generation is to make the structure of circuit become complicated, thereby has increased cost.

The purpose of this invention is to provide a kind of image processing method, wherein, utilize fairly simple circuit structure, when character shows, be easy to see that the character that overlaps onto on dynamic image or the rest image shows.

In order to achieve the above object, the invention provides and a kind ofly character shown the image process method when character shows in the imaging device overlap onto the overlapping device on the image, the level of the colored degree of depth of automated control chart picture when carrying out the character demonstration having.

Fig. 1 is the block diagram that expression has the television receiver of implementing character display circuit of the present invention;

Fig. 2 is the figure of the colored port output signal of TV microcomputer in the presentation graphs 1;

Fig. 3 is the flow chart of TV microcomputer work in the presentation graphs 1.

Below in conjunction with accompanying drawing embodiments of the invention are described.

Fig. 1 is the block diagram that expression has the television receiver of implementing character display circuit of the present invention.

Be input to TV signal processing IC (integrated circuit) 2 from character signal R, G and the B of 1 output of TV microcomputer, then, picture quality control signal from 1 output of TV microcomputer: brightness, contrast (picture contrast), colored (the colored degree of depth) and tone, through D/A converter 3,4,5 and 6 are input to TV signal processing IC 2 respectively.

Come intermediate frequency (IF) signal of self-tuner terminal and be input to TV signal processing IC 2 from the vision signal of video input terminal.The signal of handling through TV signal processing IC 2 is input to CRT7.

The work of character display circuit will be described below.

Usually, (the IF signal is demodulated to vision signal for the vision signal of handling by TV signal processing IC 2 or IF signal, carry out image processing by IC2 then), the picture quality control signal that the picture quality level is set by the user inputs to IC2, thereby keeps stable image quality.

For example, when when showing current time or current channel, that is to say, in this case, the character signal that changes when " the colored degree of depth " that require dynamic image is during from 1 output of TV microcomputer, is stored in tentation data in the memory (not shown) in advance from the colored port output of TV microcomputer 1.Now hypothesis is when the voltage of the picture quality control of TV signal processing IC 2 reduces, and the picture quality level reduces (chroma level in " the colored degree of depth " reduces), and then the signal of exporting from the colored port of TV microcomputer 1 is the sets of signals shown in Fig. 2.

Sort signal is converted to the voltage of predetermined value by the D/A converter 5 of colored (the colored degree of depth), make voltage be input to TV signal processing IC 2, the output of the vision signal of the chroma level that will change like this and character signal is simultaneously overlapping then, thereby dynamic image and character are presented on the CRT7.This is a kind of method that is used for overlapping character display on common dynamic image.

Fig. 3 is a flow chart, in the expression image-forming apparatus according to the present invention when character shows the embodiment of image processing method.

At step S1, the key of remote controller or the chain on the imaging device are depressed.At step S2.Judge whether the key of depressing like this needs character to show.

At step S3, judge that this character shows whether request comprises the variation of color data.At step S4, will become tentation data from the data that the colored port of TV microcomputer 1 is exported.At step S5, output character signal R, G and B.

Specifically, be when realizing when character shows with monochrome, then not with monochrome but show dynamic image with colour; When character shows is with colored rather than when realizing with monochrome, then shows dynamic image with monochrome.

Although the top background image of doing that shows in the imaging device that is described in is a dynamic image, also this image processing method can be used with rest image (comprising image etc. the at a slow speed) situation of image as a setting, and need not to consider any technical problem.

As mentioned above, the image processing method during character display is designed so that microcomputer provides predetermined output in imaging device according to the present invention, so that change the level of " the colored degree of depth " according to this output when character shows.So, character is shown sees easily.Like this, according to the present invention, under the situation that shows dynamic image or rest image, be easy to see reliably very much that character shows, and need not the circuit of any complexity.

Claims

1. character shown overlap onto in the imaging device of the overlapping device on the image having, carry out the image processing method of character when showing, wherein carry out " the colored degree of depth " level of character automated control chart picture when showing.

2. according to the image processing method of claim 1, it is characterized in that, is then need not monochrome come display image with colour when realizing with the unit when character shows.

3. according to the image processing method of claim 1, it is characterized in that, is with colored rather than then come display image with monochrome when realizing with monochrome when character shows.

4. according to the image processing method of claim 1, it is characterized in that described image is a dynamic image.

5. according to the image processing method of claim 1, it is characterized in that described image is a rest image.