JPS5828590B2 - Image processing method - Google Patents

Description

[Detailed Description of the Invention] In recent years, telephone networks have been used to connect home televisions to information centers that store and supply information such as weather forecasts, stock market conditions, information on entertainment events, etc., and to respond to requests from users at home. In response to this, a system has been developed that displays the above information in text and graphics on a television.

The present invention relates to an image processing method that can be applied to a terminal device in such a system that displays the above-mentioned information in the form of characters and graphics on a cathode ray tube.

This type of information may be in color rather than black and white,
The transmission of color signals constituting image information such as text and graphics from an information center that is supplied in response to a user's request distinguishes between the portions of the color signals that represent the characters and graphics and the other portions (the so-called background). They simply processed the color signals as a series of color signals without distinguishing them, and simply represented the color signals of the three primary colors of light, red, green, and blue, as binary codes, without giving any consideration.

Therefore, the information that becomes the text or figure cannot be the same color as the background, and if the difference in brightness between the text or figure and the background is not large, the user cannot change the color of the text or figure as an image. There was a strong possibility that it would become unrecognizable.

The present invention has been made in consideration of these points, and has a structure in which the signal levels of the information part and the background part of characters and figures are changed, and the purpose is to make the hue of the characters and figures and the background the same. This makes it possible to display characters and figures that should be included in an image so that the user can identify them, even if there is not much difference in brightness.This will be explained in detail below using the diagram. .

FIG. 1 is a simplified block diagram showing an embodiment of the present invention, and numeral 1 indicates a boundary signal indicating the boundary between characters and figures, which are information to be made into an image, and a background.

2 is a sinner power signal, 3 is a training input signal, and 4 is a sound input signal. These are the three primary colors of light, and are sent together with the boundary signal 1 as a binary symbol from an information center (not shown). This is the information that comes with it.

Also, 5゜6.7 is an inverter, 8 is a constant voltage generation circuit, 9
1 is a background brightness control circuit, and 10 is an output of the background brightness control circuit 9, which indicates a brightness signal.

Further, 11 is a red signal generation circuit, R is its output and is a red output signal, 12 is a green signal generation circuit, G is its output and is a line output signal, 13 is a blue signal generation circuit, and B is its output and is a line output signal. is the output signal.

FIG. 2 is a diagram showing a specific circuit of the background brightness control circuit 9, which is composed of resistors 21, 22, 23, a variable resistor 24, and transistors Try and Tr2.

FIG. 3 is a diagram showing a specific circuit example of the red signal generation circuit 11, which includes resistors 31 and 32 and a transistor Tr3.

The green signal generation circuit 12 and the green signal generation circuit 13 have a similar configuration.

Next, details of the image processing operation configured as above will be described below.

First, among the information from the information center (not shown), characters,
When the boundary signal 1 indicating the boundary between the figure and the background arrives at a binary signal, that is, at a logic level 11''', the transistor Tr1 of the background brightness control circuit 9 shown in FIG. 2 is short-circuited.

Therefore, the voltage from the constant voltage generation circuit 8 is applied to the resistor 21
, 22 and the variable resistor 24, and the divided voltage is applied to the base of the transistor Tr2.

Further, when the boundary signal 1 arrives at the logic level "On", the transistor Tr1 becomes an open state, contrary to the case of the above logic level "'1", and the voltage from the constant voltage generation circuit 8 is directly applied to the base of the transistor Tr2. It will be added.

In this way, the transistor Tr2 and the resistor 23 constitute a buffer circuit, and due to this function, the base voltage of the transistor Tr2 is applied to the constant voltage generating circuit according to the logic level "1" or "0" of the boundary signal 1 explained above. A voltage of 8 is applied, which appears on the vine, and a brightness signal of 1
Output as 0.

This luminance signal 10 is supplied to signal generation circuits 11, 12, and 13 for red, green, and blue, which are the three primary colors of light.

Also, among the information from an information center (not shown), the sinner power signal 2, the line input signal 3, and the sound input signal 4 are inverted by inverters 5, 6, and 7, respectively, and the corresponding red signal generation circuits 11
．． The signal is supplied to a green signal generation circuit 12 and a green signal generation circuit 13.

Here, among the input signals from the information center, for example, when the sinner power signal 2 arrives as a binary signal, that is, a logic level "1", the transistor Tr3 of the red signal generation circuit 11 shown in FIG. 3 is opened. , the voltage of the luminance signal 10 corresponding to the boundary signal which is the output of the background luminance control circuit 9 described above is applied to the base of the transistor Tr.

Further, when the sinner power signal 2 arrives as a logic level "0", the transistor Tr3 is short-circuited, and the transistor Tr3 is short-circuited.
The voltage applied to the base of 4 is OV.

In this way, the transistor Tr4 and the resistor 32 constitute a buffer circuit, and this circuit configuration allows the voltage applied to the base of the transistor Tr4 to be adjusted according to the logic level "1" or N Ojj of the sinner power signal 2. The red signal output R is output from the emitter.

Similarly, the line input signal 3 and the front human power signal 4 operate in the same way as the sin human power signal 2 described above, and the corresponding green signal generation circuit 12,
Line output signal G and front output signal B are passed through the blue signal generation circuit 13.
This is what we get.

The three primary colors of light, red, green, and blue, obtained as described above are then irradiated onto a cathode ray tube (not shown) and synthesized.
Images from the information center are reproduced and provided to users as information.

The variable resistor 2 that constitutes the background brightness control circuit 9 in this way
By changing the brightness signal 4 as necessary, the signal level of the brightness signal 10 that is the output of the background brightness control circuit 9 can be changed.

That is, since the signal level of the background part can be changed arbitrarily by adjusting the variable resistor 24, it becomes easy to distinguish it from characters and figures which are information.

It should be noted that the signal levels of the characters and figures by the red, green, and blue output signals R, G, and B, respectively, can be easily adjusted by changing the constant voltage supplied by the constant voltage generating circuit 8.

As described in detail above, according to the present invention, the signal levels of characters, figures, and other background parts by signals of red, green, and blue, which are the three primary colors of light, can be varied by setting the variable resistor. Therefore, even if there is not much difference in brightness between the image areas or the hues are similar, the user can adjust the brightness to the desired brightness for easy viewing depending on the content of the image on the CRT or the surrounding environmental conditions. Furthermore, by changing the supplied constant voltage, the signal level of characters and figures can be changed, so it can be used for various character display devices, graph ink display devices, etc., and has excellent effects. We can expect it.

[Brief explanation of the drawing]

FIG. 1 is a simplified block diagram showing an embodiment of the image processing method according to the present invention, and FIGS. 2 and 3 are circuit diagrams showing one specific circuit of the main part in FIG. 1, respectively. 1... Boundary signal, 2... Sinner power signal,
3... Picture input signal, 4... Human power signal, 5, 6, 7... Inverter, 8...
Constant voltage generation circuit, 9...Background brightness control circuit, 1
0...Brightness signal, 21,22°23.31,3
2...Resistor, 24...Variable resistor,
Trl, Tr2, Tr3. Tr4++・m) transistor, R... Red output signal, G... Line output signal, B... Front output signal.

Claims (1)

[Claims] 1. A human input signal is a signal expressed as a binary code (for example, logic levels ``'l'' and ``0''), and includes input signals of the three primary colors of red, green, and blue light, and information. It is connected to a circuit that supplies a constant voltage signal, and the input signal from the circuit is converted into the binary value of the boundary signal. A background brightness control circuit having means for changing the level of an output signal to be output according to the code state is provided, and the output signal level from the background brightness control circuit is set to two of the red, green, and blue input signals. An image processing method characterized by making it easy to distinguish between text and graphic parts that are information and the background by synthesizing it as a color signal output and creating an image according to the state of the value code. 2. Background brightness control circuit. 2. The image processing method according to claim 1, wherein switch means including a variable resistor is used as means for changing the signal level.