JPH06334934A - Picture display device - Google Patents

Abstract

PURPOSE:To easily execute the writing, correction or the like of a text to be superposed to a picture such as a television(TV) picture by inputting an additional picture independently of the text by an additional picture input device, storing the additional picture signal in an additional writing memory and superposing the additional picture signal to the TV picture signal by an additional synthesizer. CONSTITUTION:A surrounding line or the like is plotted on a text displayed on a monitor display device 15 by means of a write pen 10. A plotting signal for a plotting graphic is generated by the write pen 10 and stored in a plotting memory 11 corresponding to a page in a current text picture. The plotting signal stored in the memory 11 is read out synchronously with a TV picture signal outputted from a video tape recoder 1 based upon a synchronizing signal outputted from a signal processing part 3, inputted to a synthesizing part 14 through a switch 12 and a gradation adjusting part 13 and synthesized with the TV picture signal to which the text is superposed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display device for superimposing and displaying text such as telop characters on the screen of a TV (television receiver, the same applies hereinafter).

[0002]

2. Description of the Related Art As such an image display device, for example, an electronic telopper is known. An electronic teloper generally uses a personal computer-based part of hardware and software to input telop characters,
It realizes conversion, font expansion, and various graphic functions.

FIG. 4 shows a conventional example of this electronic telop. In FIG. 4, 1 is a video tape recorder for reproducing TV image signals, and 2 is a personal computer for creating text such as telop characters to be superimposed on TV images.

Reference numeral 3 is a signal processing unit for performing processing such as extracting horizontal / vertical synchronizing signals from the analog TV image signal from the video tape recorder 1. A frame memory (telop memory 4) stores a text image signal from the personal computer 2 in frame units and reads it in synchronization with the clock rate of the TV image signal on the video tape recorder 1 side based on a synchronization signal from the signal processing unit 3. Also referred to as). The frame memory 4 is capable of storing a plurality of text images, and is configured so that a necessary text image can be read out as appropriate.

Reference numeral 5 denotes a switching composition unit for composing a TV image signal from the video tape recorder 1 and a text image signal from the personal computer 2. The switching / synthesizing unit 5 normally selects and outputs the TV image signal from the signal processing unit 3 side, but at the screen coordinate position where the text exists, the text image signal from the frame memory 4 side is selected and output. By switching, text is superimposed on the TV image. Reference numeral 6 denotes a video monitor for displaying the composite image composited by the switching composition unit 5 on the screen.

The operation of this conventional apparatus will be described. Text created in advance by the personal computer 2 is stored in the frame memory 4 and extracted from the TV image signal when the TV image signal is read from the video tape recorder 1. The text image signal is read from the frame memory 4 in synchronization with the TV image signal by the synchronization signal,
The TV image signal and the text image signal are combined by the switching composition unit 5, and the composite image in which the text image is superimposed on the TV image is displayed on the video monitor 6.

Since the TV image signal output from the video tape recorder 1 and the text image signal generated by the personal computer 2 have different signal formats, the above-described configuration is adopted.
This is because it is necessary to convert the text image signal on the side into a TV image signal by converting the signal format.

[0008]

In the image display device described above, a mode for creating text such as telop characters in the personal computer 2 is a creation mode, and the created text image signal is transferred to the frame memory 4 to be a TV image signal. The mode for reading in synchronization is called the sending mode.

In this conventional apparatus, the text to be superimposed on the TV image needs to be created in advance in the creation mode, and the creation cannot be performed in the sending mode. In other words, as the text to be superimposed, there is no choice but to select from a plurality of texts created in advance in the creation mode, switch it to the sending mode, and send it. Therefore, if it becomes necessary to write or modify the contents of the text after switching to the send mode, once cancel the send, return to the create mode, correct the text, and then switch to the send mode again. It needs to be sent out. However, such a process takes time, and when it is desired to urgently correct / change the text content that has already been created, for example, at a broadcast site, it cannot be easily performed in reality.

The present invention has been made in view of the above problems, and an object of the present invention is to make it possible to easily write or modify texts superimposed on an image such as a TV image. is there.

[0011]

In order to solve the above-mentioned problems, the image display device of the present invention has, as one form,
In an image display device for displaying a text created in advance by superimposing it on a predetermined image, an additional image input device for inputting an additional image separately from the text and an additional image signal input by the additional image input device are stored. It is provided with a writing memory and an additional synthesizing device for superimposing the additional image signal read from the additional writing memory on a predetermined image signal.

As another form of the image display device of the present invention, in the above-mentioned image display device, a display ON / OFF means for controlling the sending / stopping of the sending of the additional image signal from the additional writing memory to the additional synthesizing device is provided. It is configured to further include.

As another form of the image display device of the present invention, in the above-mentioned image display device, a gradation adjusting means for adjusting the gradation of the additional image signal input to the additional synthesizing device is further provided. It was done.

As still another form of the image display device of the present invention, in the above-mentioned image display device, the text is stored in the text memory in units of a plurality of pages, and the additional write memory is used to store the additional image. It is configured so that it is stored in units of a plurality of pages and corresponding to each page of the text memory, and pages are forwarded / returned and read synchronously so that the stored image pages of the text memory and the additional writing memory correspond to each other. The page feed / return means is further provided.

[0015]

[Operation] When it is desired to perform additional writing or correction on the text superimposed on the display image, the additional image input device inputs the additional image separately from the text, and the additional image signal is added to the additional writing memory. Remember. Then, the additional image signal read from the additional writing memory is superimposed on the TV image signal by the additional synthesizing device. As a result, the finally displayed composite image can include an image such as a video and text as well as an additionally written image.

By using the display ON / OFF means, it is possible to arbitrarily display or erase the additional writing image. At this time, the original text can be saved as a material image without being damaged.

Further, even when the additional writing image fills the original image or the text and the visibility is lowered, if the gradation of the additional writing image is adjusted to be lighter by adjusting the gradation. , Visibility can be restored.

If the page feed / return means is used, an additional writing image corresponding to the page of the text can be displayed with respect to the displayed text. Therefore, each time the text screen is switched, the additional writing image corresponding to the additional writing image is displayed. Since the information is displayed, the explanation can be made more effectively when the explanation is given based on the composite image.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an image display device as an embodiment of the present invention. Here, the video tape recorder 1 in the figure,
The personal computer 2, the signal processing unit 3, the frame memory 4, the switching composition unit 5, and the video monitor 6 are the same as those described in the section of the prior art.

Reference numeral 10 is a light pen, and 15 is a monitor display device. The light pen 10 and the monitor display device 15 constitute a pointing device for inputting a drawn image. That is, the same image as the composite image signal input to the video monitor 6 is input to the monitor display device 15, and the same image as the video monitor 6 is displayed. By drawing with the light pen 10 on the screen of the monitor display device 15, a drawing signal composed of position (XY coordinate) information of the drawing figure on the screen and writing pressure (drawing pressure) information is generated and output. can do. As the writing pressure information, the absolute value of the drawing signal is large at the position where the writing pressure is large and is small at the position where the writing pressure is small.

Reference numeral 11 denotes a drawing memory for storing the drawing signal in units of frames. The drawing memory 11 can store a plurality of drawing figures in association with each page of the text image in the frame memory 4. . The reading of the drawing signal from the drawing memory 11 is performed by the signal processing unit 3
It is performed according to the synchronization signal from. That is, the drawing signal is read out in synchronization with the TV image signal of the video tape recorder 1. The writing ON / OFF control unit 17 controls ON / OFF of writing a drawing signal from the light pen 10 to the drawing memory 11.

Reference numeral 16 is a text forward / backward control unit,
This text feed / return control unit 16 is used for the frame memory 4
The page of the plurality of text images stored in is forwarded or returned, and the plurality of drawing figures stored in the drawing memory 11 are also used for page feed / return of the text image in the frame memory 4. Corresponding page feed / return.

Reference numeral 12 is a switch for turning on / off the display.
It is possible to turn ON / OFF the sending of the drawing signal read out from the drawing memory 11 to the synthesizing unit 14 side by being turned ON / OFF under the control of the control unit 18.

Reference numeral 13 is a gradation adjusting unit, and this gradation adjusting unit 13 adjusts the gradation of the drawing figure from the drawing memory 11 according to the magnitude of the gradation adjusting signal from the gradation adjusting signal generating unit 19. It can be adjusted.

Reference numeral 14 is a synthesizing unit, and this synthesizing unit 14 synthesizes the superimposing TV image signal from the switching synthesizing unit 5 so as to superimpose the drawing signal from the drawing memory 11. The combined image signal combined by the combining unit 14 is sent to the video monitor 6 and the monitor display device 15.

FIG. 2 shows a detailed configuration example of the synthesizing unit 14. As shown, the voltage controlled amplifiers 21, 22,
The inverter 23 and the adder / synthesizer 24 are included. The voltage control amplifiers 21 and 22 are amplifiers whose gain can be controlled according to the magnitude of the control voltage. The voltage control amplifier 21 receives the TV image signal from the switching / combining unit 5 as its input signal and draws it as the control voltage. The drawing signal from the memory 11 side is inverted in level by the inverter 23 and input. On the other hand, the voltage control amplifier 22 receives the superimposed character color level signal as its input signal and the drawing signal from the drawing memory 11 side as the control voltage. Here, the superimposed character color level signal is a signal that determines the color level of the drawing figure to be displayed, and has a certain fixed value. In addition, the adder / synthesizer 24
Is a circuit for adding and synthesizing the output signals of the voltage control amplifiers 21 and 22 and outputting as a synthesized image signal.

When the synthesizing section 14 is constructed as described above, if the size of the drawing signal read from the drawing memory 11 is large, the drawing signal is input to the voltage controlled amplifier 21 as a control voltage via the inverter. Therefore, the gain on the side of the voltage control amplifier 21 decreases, and the TV image signal from the switching / combining unit 5 decreases (that is, the density of the TV image decreases), while the color level signal output from the voltage control amplifier 22 increases. Then (that is, the shading of the drawn figure becomes darker) and they are combined. On the contrary, if the size of the drawing signal read from the drawing memory 11 is small, the TV image is dark and the drawing figure is thin, and the TV image is combined. Therefore, depending on the writing pressure when drawing with the light pen 10, the degree of shading of the combined TV image and drawing figure changes so that the drawing figure is dark when the writing pressure is high and becomes thin when the writing pressure is small. It will be.

It should be noted that in FIG.
An A converter is used, and this D / A converter changes the analog voltage level of the output signal in accordance with the magnitude of the gradation adjustment signal so that the gradation adjustment can be substantially performed. There is.

The operation of the apparatus of this embodiment will be described below.
The operation of synthesizing the TV image signal from the video tape recorder 1 with the text image signal created by the personal computer 2 in the creation mode in the switching synthesizing unit 5 is the same as that described in the related art. In the transmission mode, the composite image in which the text is super-invoked on the TV image is displayed on the video monitor 6, and the same composite image is also displayed on the monitor display device 15.

In this sending mode, in order to emphasize the important points and effectively explain the text portion of the composite image displayed on the monitor display device 15, a predetermined character is surrounded by a line. Underlines are used. To this end, the text displayed on the monitor display device 15 is drawn using the light pen 10 such as a surrounding line. As a result, the light pen 10 generates a drawing signal for the drawing figure, and the drawing signal is stored in the drawing memory 11 corresponding to the page of the current text image.

Similarly, when the text image from the frame memory 4 is switched, a drawing figure corresponding to the text image is created by the light pen 10 and the drawing signal is stored in the drawing memory 11. That is, as shown in FIG. 3, each page of the drawn image is stored in the drawing memory 11 in association with the page of the plurality of text images stored in the frame memory 4.

The drawing signal stored in the drawing memory 11 is read out in synchronism with the TV image signal from the video tape recorder 1 based on the synchronizing signal from the signal processing unit 3, and this is read by the switch 12 and the gradation. It is input to the synthesizing unit 14 via the adjusting unit 13, and is synthesized with the TV image signal on which the text is superimposed. The combined image signal in which the drawing signal is additionally combined in this manner is sent to the video monitor 6 and the monitor display device 15, so that a combined image in which text and drawing figures are superimposed on the TV image is displayed on their screens.

If the display ON / OFF control section 18 turns off the switch 12 when the emphasis by the drawing figure is no longer necessary, the sending of the drawing signal from the drawing memory 11 to the synthesizing section 14 is stopped. Therefore, the drawn figure is erased from the composite image. As described above, since the drawing figure for emphasis is not directly written in the frame memory 4, the text image on the side of the frame memory 4 is stored as it is regardless of the presence or absence of the drawing figure. Therefore, the text material image is contaminated and damaged. Can be prevented.

By turning the display ON / OFF by the display ON / OFF control unit 18, it is possible to easily make a TV image of only the original material image (including text etc.) or switch to a TV image with a drawing figure added. Since it is possible to compare the two images easily, the video monitor 6
When the explanation or the like is made on the basis of the combined image displayed on, the explanation can be effectively made.

Furthermore, by adjusting the magnitude of the gradation adjustment signal by the gradation adjustment signal generator 19, the size of the drawing signal from the drawing memory 11 can be changed,
As a result, it is possible to arbitrarily specify the gradation of the drawing figure to be superimposed on the TV image. With this configuration, when the shade of the added drawing figure is too dark to fill the original material image, the gradation of the drawing figure is lowered to reduce the degree of filling of the material image. As a result, the visibility of the material image as the background is improved, and the explanation based on the composite image can be easily understood.

Further, when the text feed / return control unit 16 page-feeds or returns the text image stored in the frame memory 4, the drawing figure of the drawing memory 11 is also displayed correspondingly to the page of the text image. The same number of pages are forwarded / returned to correspond to. As described above, in the drawing memory 11, as shown in FIG. 3, the page structure management corresponding to each page of the text created in advance is performed. ) When sending, the drawing figure written for the previous page is automatically deleted,
Further, for convenience of explanation, even if the page is returned to the previous text, the drawing figure for the text is automatically read from the drawing memory 11 and displayed again. By doing so, it is possible to effectively explain with a text or the like.

Various modifications are possible in carrying out the present invention. For example, in the above-described embodiment, the additional image to be written later is a handwritten drawing figure with a light pen, but the present invention is not limited to this, and if necessary, other image creating means such as a personal computer may be used. The characters / figures created by using the text may be added later to the TV image after the text is superimposed.

Further, in the above-described embodiment, as a method of superimposing the additional drawing figure on the TV image, after the text image signal is superposed on the TV image signal, the additional drawing signal is further combined with the combined image signal. However, the present invention is not limited to this. For example, the additional drawing signal and the T
The V image signal may be first combined and then the text image signal may be combined. Alternatively, the additional drawing signal and the text image signal may be combined and then combined with the TV image signal, or all of them may be combined at the same time. It is also possible to configure to synthesize.

[0039]

As described above, according to the present invention, it is possible to easily perform additional writing, correction, etc. on a text superimposed on an image such as a TV image. Therefore, in the case of giving an explanation based on the composite image displayed on the video monitor, it is necessary to write an underline for emphasis or correct / add the explanation in a short time with respect to the previously created explanation. It can be performed easily, and thereby the effect of the explanation based on the composite image can be enhanced.

[Brief description of drawings]

FIG. 1 is a block diagram showing an image display device as an embodiment of the present invention.

FIG. 2 is a block diagram showing a detailed configuration of a combining unit in the apparatus of the embodiment.

FIG. 3 is a diagram for explaining page configuration management of a drawing memory.

FIG. 4 is a block diagram showing a conventional image display device.

[Explanation of symbols]

1 Video Tape Recorder 2 Personal Computer 3 Signal Processing Section 4 Frame Memory 5 Switching Composition Section 6 Video Monitor 10 Light Pen 11 Drawing Memory 12 Switch 13 Gradation Adjusting Section 14 Compositing Section 15 Monitor Display Device 16 Text Forward / Return Control Section 17 Writing ON / OFF control unit 18 Display ON / OFF control unit 19 Gradation adjustment signal generation unit 21, 22 Voltage control amplifier 23 Inverter 24 Additive synthesizer

Claims (4)

[Claims] 1. An image display device for displaying a text created in advance by superimposing it on a predetermined image, and an additional image input device (10, 15) for inputting an additional image separately from the text, and the additional image. Image display including an additional writing memory (11) for storing an additional image signal input by an input device, and an additional synthesizing device (14) for superimposing the additional image signal read from the additional writing memory on the predetermined image signal apparatus. 2. A display ON for controlling transmission / stop of transmission of an additional image signal from the additional writing memory to the additional synthesizing device.
The image display device according to claim 1, further comprising: an OFF means (12, 18). 3. The image display device according to claim 1, further comprising a gradation adjusting means (13, 19) for adjusting a gradation of an additional image signal input to the additional synthesizing device. . 4. The text is configured to be stored in the text memory (4) in units of a plurality of pages, and the additional writing memory is configured to add an additional image in units of a plurality of pages and to each page of the text memory. It further comprises page feed / return means (16) configured to store correspondingly and synchronously page forward / backward and read out so that the pages of the stored image in the text memory and the additional writing memory correspond to each other. The image display device according to claim 1, wherein the image display device is a display device.