JPH05122605A - Still image transmission system - Google Patents

Abstract

PURPOSE:To synthesize a still image received at another channel with part of a still image being received via an ISDN and to display the synthesized image. CONSTITUTION:The still image is inputted from the ISDN line network via an input parts 1. When an input signal has been processed in data compres5ion, the signal is inputted to a data expansion part 2 via a control part 6 to expand the data as necessary. When the still image is inputted at another channel in the ISDN 7 and the input data has also been processed in data compression, the data expansion part 2 expands the data independently from the former input signal data. When two still images are inputted, they are inputted to an image synthesization part 3, which reduce the size of one of the still image and synthesizes it with another of the still image. The signal from the image synthesization part 3 is inputted to a D/A conversion part 4, converted into an analog image signal, inputted to an image display part 5 and displayed on a screen.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a still image transmission system, and more particularly to a system for inputting image information in a plurality of channels via a digital communication network and synthesizing a plurality of images on one screen for display.

[0002]

2. Description of the Related Art In a still image transmission apparatus using an analog line network or the like, for example, when a still image is transmitted from another party while receiving the still image, it is necessary to receive the received image in order to see the transmitted image. It is necessary to temporarily hold the inside one and receive the other still image, which causes troubles such as the interruption of the communication that came first. Alternatively, in the case of a still image transmission apparatus using a digital communication network capable of simultaneously communicating information on a plurality of channels, while information is being received on one channel, communication on another channel is not accepted, and in the case of an emergency, etc. There is a problem that information cannot be confirmed.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and when still images are respectively sent through a plurality of channels by a digital communication network or the like, a part of one image is partially transferred to the other image. The present invention provides a still image transmission system that synthesizes images and displays them on a screen.

[0004]

In order to solve the above-mentioned problems, the present invention uses an input unit for inputting information data of a plurality of channels from a required digital communication network and an information unit of different channels from the input unit. Image synthesizing section for synthesizing the images of 1 into one image, a D / A converting section for converting the data from the image synthesizing section into an analog image signal, and a D / A
An image display unit that displays the image signal from the conversion unit on the screen,
The present invention provides a still image transmission system including a control unit that controls the input unit, the image synthesis unit, and the D / A conversion unit.

[0005]

With the above construction, in the still image transmission system according to the present invention, when still images are respectively transmitted through a plurality of channels of the digital communication network, one still image is combined with the other still image. It is generated as one image, converted into an analog image signal, and displayed on the screen of a monitor or the like.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a still image transmission system according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a block diagram of essential parts of an embodiment of a still image transmission system according to the present invention. In the figure, 1 is an input unit, for example, ISD
A digital information signal is input via N (Integrated Digital Communication Network) or the like, and information from two ISDN channels can be input at the same time. A data decompression unit 2 performs a required data decompression process when the information signal from the input unit 1 is data-compressed. An image synthesizing unit 3 synthesizes images input from two channels into one image. A D / A converter 4 converts the digital image data from the image synthesizer 3 into an analog image signal. An image display unit 5 displays the image signal from the D / A conversion unit 4 on a monitor screen or the like. A control unit 6 controls each unit.

Next, the operation of the still image transmission system according to the present invention will be described. A digital signal of a still image is input from the ISDN line network or the like via the input unit 1. When the input signal is subjected to data compression processing, it is input to the data decompression unit 2 via the control unit 6, temporarily recorded in the buffer memory or the like, and read data decompression processing is appropriately performed. The input unit 1 is an ISD
Two data channels can be input simultaneously by connecting to two information channels of the N line network. Further, the data decompression unit 2 has a function of separately decompressing different data, and the two data channels of the ISDN line network are When a still image compressed in each of the information channels is input, the expansion processing of each information data is performed at the same time. The data from the data decompression unit 2 is input to the image synthesis unit 3 via the control unit 6, and is input to the lower right portion of the image 11 input to one channel in the other channel as in the example shown in FIG. A reduced image of the image 12 is fitted and a composite image like the image 13 is generated. The reduction processing in the image composition unit 3 is
The input signal is once recorded in a buffer memory or the like and then read out as appropriate. For example, when the screen size is reduced to one-third, one horizontal scanning line is extracted for every three lines.
The screen is reduced by extracting one pixel out of three pixels for each line. Then, the data in the range corresponding to the combining position of the combined image recorded in the buffer memory or the like is replaced with the reduced data and combined into one image. The data combined by the image combining unit 3 is input to the D / A conversion unit 4, converted into an analog image signal, and displayed on a monitor screen or the like via the image display unit 5.

[0008]

As described above, according to the still image transmission system of the present invention, if a still image is input to the other channel while receiving the still image from one channel, one of the one image is transmitted. The other image is combined and displayed on the copy. Therefore, while the still image is being received, other information can be viewed without interrupting the reception, and there is no fear of impeding emergency contact or the like.

[Brief description of drawings]

FIG. 1 is a block diagram of essential parts of an embodiment of a still image transmission system according to the present invention.

FIG. 2 is a diagram showing an example of image combination.

[Explanation of symbols]

 1 input unit 2 data decompression unit 3 image composition unit 4 D / A conversion unit 5 image display unit 6 control unit

Claims (1)

[Claims] 1. An input unit for inputting information data of a plurality of channels from a required digital communication network and one image for each image by the information data of different channels from the input unit.
An image synthesizing unit for synthesizing an image, a D / A converting unit for converting data from the image synthesizing unit into an analog image signal, and a D / A converting unit.
A still image transmission system comprising an image display section for displaying an image signal from the A conversion section on a screen and a control section for controlling the input section, the image composition section and the D / A conversion section.