JPH05110749A - Picture transmitter - Google Patents

Abstract

PURPOSE:To provide the picture transmitter able to confirm a picture already sent by writing same picture information as the sent picture information onto a data card. CONSTITUTION:A picture signal inputted from an input terminal 101 is processed by a signal processing section 102 and converted into a digital picture signal by an A/D converter section 103. Based on a selection signal from an address decoder section 114, a picture signal stored in a latch section 104 is stored in a frame memory section 117. When the picture transmission is finished, the picture signal stored in the frame memory section 117 is outputted to a buffer section 18 via an address bus and a data bus and recorded in a data card 19 as a sent digital picture. Furthermore, address information of the digital picture recorded on the data card 19 is stored in a random access memory section 116 and it is used as an index when the transmission picture signal is reproduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image transmission device having a frame memory.

[0002]

2. Description of the Related Art In recent years, when an image signal is transmitted using a high speed digital line network such as ISDN (Integrated Service Digital Network), the image signal is first converted into a digital image signal and then converted into a semiconductor memory such as a frame memory. A method of recording and outputting to a line network via a modem (modulator / demodulator) is adopted.

FIG. 3 shows a conventional image transmission device.

The control program stored in the program memory unit 115 is executed by the system control unit 113, and a work area required for execution by the system control unit 113 is secured in the random access memory unit 116. Based on the address value output from the system control unit 113, the address decoder unit 114 causes the program memory unit 115, the random access memory unit 116, and the frame memory unit 117.
Is selected.

The image signal input from the input terminal is processed by the signal processing unit 102 and then A / D conversion unit 103.
Is converted into a discrete digital image signal by and is latched by the latch unit 104. The digital image signal is recorded in the frame memory unit 117 via the data bus under the control of the system control unit 113.

On the other hand, when the digital image signal recorded in the frame memory unit 117 is transmitted using the line network,
The digital image signal is sent to the modem 111 together with the additional data for communication control by the system control unit 113 in accordance with the communication protocol, and after being matched with the electrical characteristics of the line network, it is controlled by the NCU (network control unit) 110. It is output to the line network. When transmitting the next image signal, the image is similarly recorded in the frame memory unit 117.

The digital image signal stored in the frame memory unit 117 is latched by the latch unit 108, converted into an analog signal by the D / A conversion unit 107, processed by the signal processing unit 106, and then output. The image is output from the terminal 105 and an image is displayed on a display (not shown).

[0008]

However, in the above-described conventional example, when a plurality of image signals are transmitted, the next image signal is stored in the frame memory unit 117 after the transmission of the image signals is completed. Therefore, there has been a problem that the already transmitted image signal cannot be confirmed regardless of the transmitting side and the receiving side.

An object of the present invention is to solve the above problems and to provide an image transmitting apparatus capable of confirming already transmitted images.

[0010]

In order to achieve such an object, the present invention provides a processing means for processing input image information and a frame for temporarily storing the image information processed by the processing means. In an image transmission device having a memory and a transmission means for transmitting the image information stored in the frame memory, a data card and the same image information as the image information transmitted by the transmission means are written in the data card. It is characterized by comprising a writing means and a reproducing means for reproducing an image signal based on the image information stored in the data card.

[0011]

In the present invention, the same image information as the image information transmitted by the transmitting means is written in the data card by the writing means, and the image signal is reproduced by the reproducing means based on the image information stored in the data card.

[0012]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 shows an embodiment of the present invention.

In the figure, 101 to 117 show the same parts as in FIG. A data card 19 stores an image signal input via the buffer unit 18.

FIG. 2 shows the program memory unit 115 shown in FIG.
5 is a flowchart showing an example of a control program stored in the.

The image signal input from the input terminal 101 is processed by the signal processing unit 102 and then converted into a time-discrete digital image signal by the A / D converter 103.
The digital signal is held by the latch unit 104, and the held digital signal becomes accessible from the data bus shared by the system.

When image signal recording is selected from a control panel (not shown) in step S21, the system control unit 113 selects the frame memory unit 117 based on the selection signal from the address decoder unit 114 in step S22. The image signal held in the latch unit 104 is stored in the frame memory unit 117.

When image signal transmission is selected by the control panel (not shown) in step S23, step S24
In the system control unit 1, the image signal stored in the frame memory 117 and the control data for communication are stored.
13, the random access memory unit 16 combines them to generate communication data, and outputs the communication data onto the data bus. The communication data output on the data bus is latched by the latch unit 112.
Hold by the modem 111, and the modem 111 matches the line network, and the line terminal 1 as a modulated wave is transmitted through the NCU 110.
It outputs from 09 to the network.

When the image transmission is completed, in step S25, the image signal stored in the frame memory unit 117 is output to the buffer unit 18 by the system control unit 113 via the address bus and the data bus.
It is recorded on the data card 19 as a transmitted digital image. Further, the address information of the digital image recorded on the data card 19 is stored in the random access memory unit 116 by the system control unit 113. The address information stored in the random access memory unit 116 is used as an index when reproducing the transmission image signal.

When the index number corresponding to the reproduced image signal is selected from the control panel (not shown) in step S26, the address stored in the random access memory unit 16 is controlled by the system control unit 13 in step S27. The image signal stored in the address of the data card 19 is output to the data bus with reference to the information. Then, the image signal output to the data bus is held by the latch unit 8, converted to a time-continuous image signal by the D / A conversion unit 107, processed by the signal processing unit 106, and then output from the output terminal 105.

As described above, the transmission side can confirm the transmitted image after the image is transmitted.

In this embodiment, an example has been described in which the same image signal as the transmitted image signal is recorded on the data card after the image signal is transmitted, but it may be performed before the image signal is transmitted. In this case, the effects are essentially the same.

[0023]

As described above, according to the present invention,
Since the same image information as the transmitted image information is written in the data card and the image is reproduced based on the image information stored in the data card, there is an effect that the already transmitted image can be confirmed. ..

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a flowchart showing an example of a control program stored in a program memory unit 115 shown in FIG.

FIG. 3 is a block diagram showing a conventional image transmission device.

[Explanation of symbols]

 18 buffer section 19 data card 102, 106 signal processing section 103 A / D conversion section 104, 108, 112 latch section 107 D / A conversion section 110 NCU 111 modem 113 system controller section 114 address decoder section 115 program memory section 116 random access Memory section 117 Frame memory section

Claims (1)

[Claims] 1. A processing unit for processing input image information, a frame memory for temporarily storing the image information processed by the processing unit, and a transmission for transmitting the image information stored in the frame memory. An image transmission device having means, a data card, a writing means for writing the same image information as the image information transmitted by the transmitting means into the data card, and an image based on the image information stored in the data card. An image transmission apparatus comprising: a reproduction unit that reproduces a signal.