JPH05344488A - Coding transmission method and device for plural pictures - Google Patents

Abstract

PURPOSE:To reduce a transmission cost per one picture by synthesizing plural picture signals, coding the result and sending the coded signal. CONSTITUTION:The device consists of picture reduction circuits 1a-1d reducing plural input picture signals, a multiplexer section 2 synthesizing the reduced signal into one synthesis picture signal, a coding circuit 3 coding the synthesized picture signal with a band, a transmission line interface circuit 4 sending the coded picture signal to a transmission line 111, a reception line interface circuit 5 receiving the coded picture signal from the transmission line 111, a decoding circuit 6 decoding the signal, a demultiplexer circuit 7 demultiplexing the synthesis picture signal into the reduced picture and picture magnification circuits 8a-8d magnifying each reduced picture signal and sending each picture signal to each terminal equipment.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for encoding and transmitting a plurality of images.

[0002]

2. Description of the Related Art Conventionally, a method and an apparatus for encoding and transmitting a plurality of images of this type uses an encoding transmission system which encodes and transmits one image and uses a multiple system.

[0003]

As described above, in the conventional transmission method, when a plurality of images are transmitted at the same time, a plurality of coded transmission systems are required, which causes a lot of equipment and cost.

[0004]

According to the method for encoding and transmitting a plurality of images of the present invention, a plurality of input image signals are respectively subjected to image reduction processing to form one combined image signal, and the combined image signal is encoded to compress information. After that, it is transmitted as image data.

[0005]

An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of the apparatus of this embodiment. In this embodiment, the number of images to be transmitted is four. Input image signals from the terminal side are input lines 101, 10
Reduction circuits 1a, 1b, 1 via 2, 103, 104
It is input to c and 1d. Image reduction circuits 1a, 1b, 1
In c and 1d, the input image is reduced to 1/4 the size of the input screen and supplied to the multiplexing unit 2.

FIG. 2 is a block diagram of the multiplexing unit 2. The reduced image signals input from the image reduction circuits 1a, 1b, 1c and 1d are stored in the memories 21a, 21b, 21c and 21d, respectively.
Are combined with the selector 22 sequentially stored by the select signal from the select signal generation period 23, multiplexed into one screen, and output to the encoding circuit 3. The encoding circuit 3 encodes the input combined image by a band compression method and outputs the encoded image to the transmission path 111 via the transmission line interface 4.

On the receiving side, the encoded image signal received via the receiving line interface 5 is decoded by the decoding section and input to the separation section. The demultiplexing unit demultiplexes the decoded composite image into four reduced image signals according to the select signal from the select signal generator in the processing step opposite to that of the multiplexing unit 2, and supplies each to the image enlarging circuits 8a to 8d. .
The image enlargement circuits 8a to 8d enlarge the reduced image signal to the original size and output it to the terminal side.

[0008]

As described above, the present invention has the effect of reducing the transmission cost per image because a plurality of images are encoded and transmitted at one time.

[Brief description of drawings]

FIG. 1 is a block diagram of an apparatus according to an embodiment of the present invention.

FIG. 2 is a partial block diagram in FIG.

[Explanation of symbols]

 1a, 1b, 1c, 1d Image reduction circuit 2 Multiplexing unit 3 Encoding circuit 4 Transmission line interface 5 Reception line interface 6 Decoding circuit 7 Separation unit 8a, 8b, 8c, 8d Image enlargement circuit

Claims (3)

[Claims] 1. A plurality of input image signals, each of which is subjected to image reduction processing to form one combined image signal, and the combined image signal is encoded, information-compressed and transmitted as image data. Coded transmission method. 2. A plurality of image reduction circuits for inputting a plurality of image signals from the terminal side and performing image reduction processing, and an output signal of the plurality of image reduction circuits are input to form one image signal. A multiplexing unit that performs a combining process, an encoding circuit that encodes the output signal of the multiplexing unit simultaneously with the compression of the transmission band, and a transmission line interface that transmits the output signal of the encoding circuit as image data to a transmission line. A circuit, a reception line interface circuit for receiving the image data from the transmission line, a decoding circuit for decoding the output signal of the reception line interface circuit, and a plurality of reduced image signals for the output signal of the decoding circuit. And a separation part that separates into
And a plurality of image enlarging circuits for enlarging each of the plurality of reduced image signals and outputting to the terminal side as a received image signal. 3. The multiplexer includes a plurality of memories for temporarily storing output signals of the plurality of image reduction circuits, a selector for sequentially reading memory signals from the memories to create one combined image signal, and the memory. 3. The multiple image coding and transmitting apparatus according to claim 2, further comprising: a select signal generator controlled by the selector.