JPH01261982A - Still picture video telephone device - Google Patents

Abstract

PURPOSE:To transmit the large quantity of character information and to display a picture and a character on the same scope by transmitting picture data and character code data with identifying data respectively after finishing handshaking. CONSTITUTION:Terminal capacity is confirmed by handshaking, and when it becomes transmittable, the data of a next signal format are transmitted to a receiving side. That is, a picture identifying signal, picture data, a character identifying signal and a character code are transmitted following a header part. At the receiving side, the data are received by a transmission/reception part 19, and they are supplied to a memory and a display control circuit 12 through a system controller 15. Next, the picture data are written in a picture memory 13 and the character code is written in a character code memory 16, respectively. Then, the picture identifying signal and the character identifying signal are decoded, and the picture and the character are displayed on a display in the condition of scope partition at the same time corresponding to them.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a still picture video telephone device, and particularly to a technique for transmitting and displaying images and characters.

[Summary of the invention]

This invention allows setting a mode in which images and characters can be transmitted during handshaking, and then transmits image data and character code data together with identification information, so that characters and images can be transmitted. It can be transmitted as the same transmission unit, and characters and images can be displayed on the same screen on the receiving side.

[Conventional technology]

Still image video telephone systems have been proposed that transmit and receive still image information via telephone lines. In this still image videophone, a unified standard is being considered for the transmission method of image information, but the transmission of information other than images, such as text information, has not been stipulated.

Therefore, currently, when trying to transmit text, it is necessary to transmit it in the same way as a still image, which requires writing the text on paper, photographing it with a camera, and transmitting it as a still image.

[Problem to be solved by the invention]

However, the number of pixels to be transmitted as a still image is the number of pixels in the horizontal direction x the number of pixels in the vertical direction - 160 x 100 or 9
6. Since the number of pixels is about 100, the number of pixels is small, and only simple characters (hiragana, katakana, numbers, alphabets, etc.) of about 20 digits x 10 lines at most can be transmitted.

In addition, in applications such as Prepon services that use this videophone, when an image and an explanatory text for it are transmitted, each is written as a still image for one screen in a separate memory from the image and text on the receiving side. If you don't have two monitor displays, you won't be able to see both at the same time.

It is an object of the present invention to make it possible to transmit a large amount of character information regardless of the number of pixels, and to display images and characters on the same screen.

[Means to solve the problem]

The still image videophone device according to the present invention includes means for transmitting and receiving recognition information indicating the content of data to be transmitted at the time of handshake, and after completion of the handshake, at least image identification information indicating the size of the image display and image data. and means for transmitting display data that includes character identification information indicating the number of characters, character display position, etc., and coded character data, and for displaying images and characters on a divided display screen. .

[Effect]

Image data and character data are transmitted in the same transmission unit as information on the same screen. Therefore, the image and its explanatory text are displayed on the same screen on the display of the videophone device on the receiving side.

〔Example〕

Figure 2 shows the configuration of an example of connection of videophone equipment.
IA) and (IB) indicate the video telephone device as a whole. The videophone devices (LA) (IB) have exactly the same configuration, and each has a video camera (2), operation buttons (3), ! = It has a monitor display (4) made of CRT or the like. Each videophone device (IA) (1B) is equipped with a telephone device for telephone calls (5A).
) and (5B) are connected. In addition, a character input device (6
8) and (6B) are each connected to the videophone device.

The video telephone devices (LA) (1[]) are connected via a telephone line (7).

FIG. 1 shows the configuration of a video telephone device (for one person).

The image taken by camera (2) is used as an image signal, and A
/D converter (11) converts into digital image data. This digital image data is written into an image memory (13) by a memory and display control circuit (12). ° wobble, at the same time■]/A converter (14)
is converted back into analog image data, which is supplied to a monitor display (4). The image taken by the camera (2) is then displayed on this display (4).

Character information regarding this image is input using a character input device (68) or (6B). The input character data is supplied to the memory and display control circuit (12) via the system controller (1, 5).
・Character code memo I by roll turn liI & (12)
Written to J(16). The written character code data is also sent to the character generator (17) at the same time.
is converted into character image data by This character image data is mixed with the camera image in an adder circuit (18),
As will be described later, a captured image and a character image are displayed on the monitor display (4) in a split screen state.

At this time, the operation button (3) and the character manual device (6A)
(or (6B)) The size of the captured image to be displayed, that is, the number of horizontal and vertical pixels and the display position are specified, as well as the number of characters to be displayed and the display position. Here, in videophones, the number of transmission pixels is scheduled to be standardized into two modes: 160 (horizontal) x 100 (vertical) and 96 (horizontal) x 100 (vertical). Therefore, the display (4) is 160 (horizontal) x 100 (
Vertical) capabilities are available. Therefore, for example, the number of horizontal and vertical pixels of the image is 96 (horizontal) X1
If 00 (vertical) is specified and the text is displayed aligned to the left, a character display area will be created on the right side of the screen as shown in FIG. The character display capacity in this character display area is 32 columns x 25 lines. In this case, the memory and display control circuit (12) allows the image memo! J(], 3
) or the data from the Δ/D converter (11) is converted into analog data by the D/Δ converter (14) and is supplied to the adder circuit (18). During the period, character code memo IJ
A character code is read from (16) and converted into a character image signal by a character generator (17), which is then supplied to an addition circuit (18). As a result, explanatory characters for the left-aligned still image are simultaneously displayed in the character display area on the display (4) as shown in FIG.

FIG. 4 shows another display example, in which a captured image and characters are vertically divided and displayed. In this example, the vertical direction is a maximum of 100 pixels, but this is a case where 80 pixels are allocated to the image. In this example, the character display capacity is 80
Column x 5 rows.

In this example, the memory and display control circuit (
12), data read out from the image memo IJ (13) or data from the A/D converter (11) is supplied to the adder circuit (18) in all horizontal sections up to 80 pixels in the vertical direction. In all horizontal sections after 80 pixels in the direction, the character code from the character code memory (16) is converted into character image data by the character generator (17) and supplied. As a result, the fourth
As shown in the figure, a still image is displayed at the top of the display (4), and explanatory characters are displayed at the bottom.

Next, by pressing the forward button of the operation buttons (3), the above-mentioned images and characters are transmitted in the communication procedure shown in Figure 5 and in the signal format shown in Figure 6. transmitted to the other party.

That is, within the current unified standard for videophones, a manufacturer-specific mode using a manufacturer code is permitted. Therefore, in this case, a mode for transmitting images and characters is set as a mode unique to this manufacturer.

In order to enter this manufacturer's original mode, first a handshake is performed with the recipient, as shown in FIG. As shown in Figure 6, in this handshake, data consisting of a header section (21) containing synchronization signals, amplitude standards, etc., and a recognition code (22) containing a manufacturer code is exchanged between the transmitting side and the receiving side. This is done through mutual interaction. This confirms the capabilities of both the transmitting and receiving terminal devices, that is, the videophone device.

In this manner, the terminal capability is confirmed through this handshake, and if transmission becomes possible, data in the signal format shown in FIG. 6B is transmitted to the receiving side. That is, after the head section (23), an image identification signal (24) containing information on the number of horizontal and vertical pixels of the image and the display area is sent, followed by image data (25). This header (23)
The format from to image data (25) is the same as the unified standard for videophone calls, but in this example, a character identification signal (26) containing information on the number of characters, character color, and character display area is further transmitted. After that, take a note! J
The character code (27) read from (17) is sent.

The following transmission operations and data formatting are performed in the system controller (15) and the transmitting/receiving section (19). The videophone device on the receiving side has a transmitting/receiving section (
19) receives the data, which is supplied to the memory and display control circuit (12) via the system controller (15), and the image data is sent to the image memo IJ (
At 13), the character code is written into the character code memory (16). Then, the image identification signal and the character identification signal are decoded, and accordingly, the image and its explanatory characters are simultaneously displayed on the display (4) in a split-screen manner as described above.

Note that the display size and display area of images and characters are not limited to the example shown in the figure, and can be set freely.

〔Effect of the invention〕

As described above, according to the present invention, since characters are transmitted as codes in the video telephone device, a large amount of information can be transmitted regardless of the number of pixels.

In addition, since images and characters are transmitted together with identification signals that cannot be displayed by dividing the display screen,
The image and text can be viewed on the same screen on the receiving side display. Therefore, the effect of this invention is remarkable when expanding the application of information services using Brevi telephones, such as scenery and its explanatory text in travel guides.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a videophone device according to an embodiment of the present invention, FIG. 2 is a diagram showing a connection configuration of videophone equipment, FIGS. 3 and 4 are diagrams showing display examples of a display, and FIG. FIG. 5 is a diagram for explaining an example of a communication procedure by the device of the present invention, and FIG. 6 is a diagram showing an example of a signal format. (18) and (IB) are video telephone devices, (2) is a video camera, (4) is a display, (68) and (6B)
) is a character-powered device, (12) is a memory and display controller)・
The roll circuit, (13) is an image memory, (16) is a character roll memory, (18) is an addition circuit, and (19) is a transmitting/receiving section.

Claims (1)

[Claims] Means for transmitting and receiving recognition information indicating the content of data to be transmitted during handshake; and after the handshake is completed, at least image identification information indicating the size of image display, image data, number of characters, and character display. A still image television comprising character identification information indicating a position, etc. and coded character data, and a means for transmitting display data for displaying images and characters on a divided display screen. Telephone device.