JPH01160285A - Still picture video telephone communication system - Google Patents

Abstract

PURPOSE:To attain the communication still picture video telephone systems with different pattern constitution by including a data as to a pattern aspect ratio to a header of a picture data transmitted and received, eliminating part of picture data at the surrounding if a data with a different aspect ratio is received and displaying the result. CONSTITUTION:Data as to the aspect ratio of its own pattern is included in a header placed before the picture data transmitted and received. A CPU 11 recognizes the aspect ratio included in the header and if the aspect ratio differs, a data corresponding to a specific picture element from a picture data received is eliminated by the CPU 11. Thus, only the midpoint is displayed on a display device 17.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a still image videophone communication system, particularly to an improvement in a communication system between different models.

[Prior Art] There is a demand for a videophone that simultaneously transmits audio and images using a telephone communication line, but in reality, current telephone communication lines cannot continuously transmit dynamic images that require a huge amount of data. Since it is difficult to send and receive a still image to the other party during a call, still image videophones are being put into practical use.

This still image videophone allows you to
It is possible to temporarily interrupt this call and send a desired still image, such as the speaker's face, a photo screen or a picture depending on the content of the call, or the like.

Therefore, with such a still image videophone, it is possible to send and receive images over a telephone line, which was previously impossible, and the amount of data processing is limited because only one still image is sent each time. This had the advantage that it was easy to put videophones into practical use.

A videophone capable of transmitting such still images is shown, for example, in the October 1986 issue of Foreign Communication Technology.

FIG. 5 is a circuit diagram of the simple still picture video telephone. In the figure, (1) is a handset, (2) is a microphone, (3) is an audio input/output circuit, (4) is an analog circuit, (5) is a matrix switch, (6) is a telephone interface circuit, and (7) is a is the telephone line connection terminal, (8) is the speaker, (9) is the keypad, (10) is the input/output port, (11) is the CPU, (12) is the program memory, (
13) is a modulation/demodulation circuit, (14) is a television camera, (15)
) is the image controller, (16) is the image memory, (
17) is a display.

Next, the operation of transmitting audio and image signals of this conventional video telephone will be explained based on FIGS. 5 and 6.

In Figure 5, a voice call is made from a handset (1) or microphone (2) to a telephone line via an audio input/output circuit (3), an analog circuit (4), a matrix switch (5), and a telephone interface circuit (6). Connection terminal (7)
sent to. Further, an audio signal from the other party is reproduced by the handset (1) or the speaker (8) via a path opposite to the above-mentioned signal path.

When transmitting an image signal, as shown in Figure 6, in order to confirm whether the communication partner is a video phone that has the ability to communicate image data in the same data format, an ID code such as data regarding the ability is sent. Sends the containing header. Then, after receiving the header back from the other party and confirming that the other party has similar capabilities, the image data is transmitted.

That is, in FIG. 5, when the keypad (9) is used to instruct image transmission, the CPU (11) detects this via the input/output board (10) and stores the program memory (
12), the header is sent to the modulation/demodulation circuit (13) according to a program stored in advance. After modulating this header into an analog signal, it is sent out from the telephone line connection terminal (7) via the matrix switch (5). The header from the communication partner is sent to the CPU via a path opposite to the above signal path.
(11) checks the code etc.

Meanwhile, the image captured by the television camera (14) during this period is quantized by the image controller (15), stored in the image memory (16), and sequentially derived and displayed on the display (17). The image is output from the image memory (16) to the telephone line connection terminal (7).

When a header is input from the other party, the matrix switch (5) recognizes that image data reception is about to begin, and uses the carrier signal received by the matrix switch (5) to change the destination to the received signal from the telephone interface circuit (6). Switch from the analog circuit (4) to the modulation/demodulation circuit (13). After the received signal is demodulated by the modulation/demodulation circuit (13), the CPU (11) returns the header or stores the data in the image memory (16), and the image controller (15) sequentially converts the self-image data and the other party's image data. It is derived and displayed on the display (17). Further, a simple header containing an indicator indicating that the image data starts is also usually placed at the beginning of the image data.

Note that when the transmission and reception of images is completed and the carrier signal from the modulation/demodulation circuit (13) disappears, the matrix switch (5
) is the telephone interface circuit (6) and the analog circuit (4).
) to restore voice calls.

[Problems to be Solved by the Invention] In such a conventional still image videophone communication system, when image data is sent from a still image videophone device with a different screen aspect ratio, it is difficult to display the image data. The problem was that it could not be done.

This invention was made to solve these problems, and is a still image videophone communication system that allows accurate display on the receiving side even when image data with different screen aspect ratios is sent. The purpose is to provide

[Means for Solving the Problems] A still image videophone communication system according to the first invention is a still image videophone communication system that transmits and receives desired still images during a call using a telephone communication line. In addition to including data about the screen aspect ratio in the header of the image data, if data with a width and width ratio different from the aspect ratio of the own screen is received, an image corresponding to at least part of the peripheral area of the own screen is received. Delete the data and
The feature is that the display matches the own screen.

A still image videophone communication system according to a second aspect of the present invention is a still image videophone communication system in which a desired still image is transmitted and received during a call using a telephone communication line, and data about the screen aspect ratio is added to the header of the image data. In addition, if data with a different screen aspect ratio is received, image data of a pre-stored specific pattern is added to at least part of the peripheral area of the user's own screen to match the image data to the user's own screen. It is characterized by displaying.

[Function] In the still image videophone communication system of the present invention, the header of the image data includes data on the number of pixels of the image signal and the screen aspect ratio. Therefore, on the receiving side,
It is possible to recognize the screen aspect ratio of the data sent.

If the received image data is different from the aspect ratio of the own screen, the data corresponding to the peripheral part of the received image data is deleted or a specific pattern is added to the part corresponding to the peripheral part of the own screen. This allows you to display a display that suits your screen.

This enables communication between still image videophone devices having different screen configurations.

[Example] Hereinafter, an example of the present invention will be described based on the drawings.

The still image videophone communication system of this invention uses a CPU (1
It is characterized by the internal processing procedure of 1), and the components (1) to (17) are the same as the conventional example shown in FIG. 5, and their explanation will be omitted.

The characteristic feature of this embodiment is that data about the aspect ratio of the own screen is included in the header that is prefixed to the image data to be sent and received.

This data may be included in a header used for exchanging ID codes prior to sending and receiving image data as in the conventional example described above, or may be included in a header provided at the beginning of image data.

The CPU (11) then stores the program memory (12) in the program memory (12).
) A header containing the screen aspect ratio (hereinafter referred to as aspect ratio) corresponding to the own display (1) is created according to a program stored in advance in the computer.

Next, in this embodiment, when receiving image data, the header is first supplied to the CPU (11);
(11) recognizes the aspect ratio included in this header and determines whether this matches the aspect ratio of its own screen. If this is correct, the conventional processing is performed.

Here, if the aspect ratio of the transmitted image data and the aspect ratio of the own screen are different, the following processing is performed.

For example, if the number of pixels on your own screen is 96x96 and the aspect ratio is 5:4 horizontally as shown in Figure 2, the number of pixels in the received image data is 96x96 and the aspect ratio is 5:4 as shown in Figure 3. If the ratio is 3:4 horizontally, if this is displayed on the screen as it is, the display will be strangely long. Therefore, in this embodiment, the CPU (
In step 11), data corresponding to a specific pixel is deleted from the received image data.

That is, from among the 96 pieces of image data from the 1st line to the 96th line, the 1st to 20th and 77th to 96th data corresponding to pixels on both sides of the screen are deleted. For this reason, the display (17
), the data in the shaded area in FIG. 1 is deleted, and only the central portion in FIG. 1 is displayed. In other words, a screen substantially similar to that shown in FIG. 2 is obtained.

Note that since the images on both sides in FIG. 3 are deleted, what was displayed in these areas on the sending side will not be displayed on the receiving side. However, in the case of still image videophone devices, self-portraits and the like are often transmitted and received, and there are many cases where it is not a problem even if the portions on both sides are deleted. Further, the display on the own screen is about 96 vertical x 56 horizontal pixels. Therefore, the image data is processed in the CPU (11) by means such as inserting the same data as the adjacent pixel, and
will be displayed as corresponding to the pixel. In this way, accurate display can be performed even when image data with different aspect ratios are received.

Note that even when the number of pixels of the received image data is different, the same effect can be obtained by deleting data corresponding to pixels on both sides after matching the number of pixels of the received image data.

Next, as shown in FIG. 4, by adding a specific pattern to the horizontally long received image data, it may be converted into image data suitable for the own screen and displayed.

For example, as in the case above, the number of pixels on your screen is 96.
X96, the aspect ratio was 5:4 horizontally as shown in Figure 2, the number of pixels of the received image data was 96x96, and the aspect ratio was 3:4 horizontally as shown in Figure 3. In this case, the CPU (11) compresses 96 lines of image data into 58 lines. Then, a specific pattern such as white or black is inserted into the image data of 19 lines above and below. This allows the image displayed on the display (17) to be similar to the image displayed on the destination screen.

In this way, image data with different aspect ratios can be sent and received in this example as well.

Note that it is also possible to convert between image data of various aspect ratios, without relying on the above-mentioned example. It also has means for both data deletion and specific pattern addition as described above, and the keypad (
The processing method may be selected by operations such as 9), or a combination of these may be used.

[Effects of the Invention] As described above, according to the still image videophone communication system according to the present invention, smooth communication between still image videophone devices having different aspect ratios is possible.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing image data processing to which an embodiment of the still picture videophone communication system according to the present invention is applied, and FIG. 2 is an explanatory diagram showing an example of the display of the still picture videophone device in the same embodiment. , FIG. 3 is an explanatory diagram showing another example of the display of the still image video telephone device according to the same embodiment, FIG. 4 is an explanatory diagram showing image data processing to which another embodiment is applied, and FIG. FIG. 6 is a block diagram showing the configuration of a still picture video telephone device, and a sequence diagram showing an image transmission procedure of a conventional video telephone device. In the figure, (1) is a handset, (5) is a matrix switch, (11) is a CPU, and (13) is a modulation/demodulation circuit. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. Agent: Patent attorney Masuo Oiwa (and 2 others) Procedural amendment 6-5P'' 1925, Month, Day 2, Name of invention: Still image video telephone communication system 3, Relationship with the person making the amendment: Representative of the patent applicant Moriya Shiki 4, agent address: 2-3, Marunojiju-chome, Chiyoda-ku, Tokyo
I'7 5, Detailed description of the invention in the specification to be amended. 6. Contents of amendment

Claims (2)

[Claims] (1) In a still image videophone communication system that sends and receives desired still images during a call using a telephone communication line, data about the screen aspect ratio is included in the header of the image data to be sent and received, and the aspect ratio of the screen is adjusted accordingly. A still image videophone communication system characterized in that when data with a horizontal ratio different from the ratio is received, image data corresponding to at least a part of the peripheral area of the own screen is deleted. (2) In a still image videophone communication system that sends and receives desired still images during a call using a telephone communication line, data about the screen aspect ratio is included in the header of the image data, and data with different screen aspect ratios is transmitted and received. A still image videophone communication system characterized in that when a videophone is received, image data of a pre-stored specific pattern is added to at least a part of the peripheral area of the own screen.