JPH01126887A - Image transmitter - Google Patents

Abstract

PURPOSE:To transmit an image according to the transmission mode of a black and white, a color and resolution to a remote place in a catalogue sale or the like by arbitrarily selecting the transmission modes of transmission time, the resolution, color and the black and white to transmit them, discriminating the transmission mode, correctly receiving and reproducing corresponding image data at a receiving side, as well. CONSTITUTION:An analog image signal picked up by a television camera 2 is converted to a digital signal and stored in video memories (V-RAM) 5, 6. The data of the video memories 5, 6 can be communicated by a personal computer in a communication line 20 through a modem 19. Then, a CPU 12 having the respective transmission mode selection command function of the black and white mode, the color mode, the resolution mode at the time of a transmission and a reproducing command function of the mode by discriminating the transmitted mode at the time of receiving is provided. Thereby, the image excellent in the quality of merchandise can be reproduced in the catalogue sale or the like.

Description

Detailed Description of the Invention "Field of Industrial Application" The present invention is an image transmission device that can transmit images in accordance with transmission modes of black and white, color, and resolution to a remote location in non-store sales, catalog sales, etc. It is related to.

"Conventional technology" Conventionally, as a technology for transmitting images to a remote location using digital communication, the image is A/D converted, the obtained digital information is sent to the remote location via a telephone line, and the receiving side performs D/A conversion. There is a so-called facsimile machine that reproduces images.

``Problems to be solved by the invention'' Conventional facsimile machines have only two gradations, black or white, and cannot reproduce images with intermediate gradations, making it difficult to reproduce high-quality images of products in catalog sales, etc. Furthermore, although the image is reproduced using the received data, the data cannot be stored in memory and used.

The present invention aims to solve these problems.

Means for Solving Problem F" The present invention digitally processes image data captured by a television camera, stores it in a video memory, and enables data in the video memory to be communicated with a personal computer via a communication line via a modem. When sending, use black and white mode,
It has a function of instructing transmission mode selection of color mode and resolution mode, and is equipped with a CPU having a function of determining the transmitted mode at the time of reception and instructing reproduction according to that mode.

"Operation" An analog image signal captured by a television camera is converted into a digital signal and stored in a video memory (V-RAM). At this time, the image signal is stored in memory by dividing each color signal of R, G, and B into four levels of luminance signal. When a transmission mode is selected and commanded by the CPU of the personal computer, that transmission mode is first sent from the modem to the other party via the communication line. This mode includes, for example, color transmission mode.

It is assumed that there is a black and white high resolution mode and a black and white low resolution mode. The receiving side receives the transmission mode and determines it to be automatic fishing. Then, the transmitting side sends image data corresponding to the transmission mode selected from among the data stored in the V-RAM. On the receiving side, in the color transmission mode, the sent image signal is temporarily stored in V-RAM, sent to the palette circuit, further converted to an analog signal by the D/A conversion circuit, and displayed on the television receiver. RlG
, B are each divided into four levels of brightness signals, a color image signal of 4,096 colors is obtained by combining the four levels, and is displayed using these 4,096 colors. In the black-and-white high resolution mode, only G is decomposed into 4-level luminance signals, which are sent and reproduced at a high resolution of 16 gradations.

In the black and white low resolution mode, only one stage of G is sent and reproduced at low resolution. Note that image signal communication is performed using HDLC.
(High Level Date Link Con
trol Procedures) method.

"Example" An embodiment of the present invention will be described below with reference to FIG.

(1) is a television receiver, and a television camera (2) is connected to this television receiver (1), and A that converts analog image signals taken by this television camera (2) into digital. /D conversion circuit (3), digitizing circuit (
4) First and second V-RAMs as video memories
(5) (6) are combined. This first, second (
7) V-RAM (5) (6) are pallet circuits (7), D
It is coupled to the television receiver (1) via a /A conversion circuit (8).

Next, (9) is a floppy disk that stores computer programs, and this disk (9) is a deck (1
0) to the deck controller (11);
This deck controller (11) is the main CPU (
12), the main RA, M (13), and the serial controller (14). In addition, the main CP
U (12) and main RAM (13) are connected to the first. Second VR
The sub-CPU (16) is coupled to the AM (5) (6) and the sub-CPU (16), which in turn is coupled to the keyboard (18) via an encoder (I7).

The serial controller (14) is a modem for modulation and demodulation (
The modem (19) is connected to a communication line (20) via a telephone (21).

The communication line (20) can be a private line as well as a public line such as a telephone line.

Next, the operation will be explained with reference to flowcharts shown in FIGS. 2 and 3.

In FIG. 2, the system starts by turning on the power, and performs initialization and internal settings for each device. Next, a menu is displayed on the television receiver (1), and the operator makes menu selections such as transmission and reception. When auto dial is selected using the keyboard (18), a call is made to the other party. That is, a command from the main CPU (12) controls the modem (19) via the serial controller (14) to auto-dial a pre-registered party. If you select maintenance, you can register or modify the other party's name, phone number, etc. When image transmission/reception is selected, the image captured by the television camera (2) is transmitted or received.

The operation of this communication will be explained in more detail.

When the operator selects transmission using the keyboard (18), the image signal captured by the television camera (2) is converted by the A/D conversion circuit (3) and sent to the digitization circuit (4). 1. Second V-RAM (5)
(6), but at this time, the image signal is stored in the fourth
As shown in the figure, it is not only decomposed into R, G, and B, but also
Each brightness is divided into four levels (numbered 3, 2, and 1.0 in order from the highest to the lowest of 8 degrees) and stored in memory. That is, the first V-RAM (5) has B3. B2
．． R3, R2, G3. G2 is memorized and the second V-R
AM (6) stores old, BO, R1, RO, Gl, and Go. Next, the transmission mode is keyboard (18)
is selected. The transmission modes include color transmission, black-and-white high-resolution transmission, and black-and-white low-resolution transmission. One of these modes is transmitted to the receiving side, and the receiving side determines the mode and waits for image data input. On the transmitting side, in the case of color transmission mode, R, G
, B are all transmitted. In the case of the black and white high resolution transmission mode τ mode, four levels of G luminance signals are transmitted. In the case of the monochrome low-resolution transmission mode, a one-level G luminance signal is transmitted. During transmission, the first and second ■-R
A M (5) Reads the image signal from (6) and combines several lines (for example, 8 lines) into one to create transmission data. At the same time, a control signal is output from the serial controller (14) based on a command from the main CPU (12), and the modem (19) connects the communication line (20) to the personal computer for communication with the personal computer. The image data is then sent to the other party. In the TV receiver (1), the fifth
As shown in the figure, there is a mark (
22) is displayed. If one screen has 152 lines, eight lines are transmitted at one time, so marks (22) for each eight lines are displayed. Transmission of one screen is completed after transmitting 8 lines 19 times.

Next, when the operator presses the receive key of the send/receive keys, the transmission mode is first received from the communication line (20), this mode is determined by the main cpu (12), and the mode that can be received is determined by the main CPU (12). state. The image data in that transmission mode is then written into the first and second V-RAMs (5) and (6). One screen worth of signals from any of the color mode, black and white high resolution mode, and black and white low resolution mode are written to the first and second V-RAMs (5) and (6), and the TV is received by 8 lines each. Displayed on machine (1). Displays 4096 colors in color mode, 166 colors in black and white high resolution mode
It is displayed in gradations, and in black and white low resolution mode it is displayed in two gradations. When a key is pressed on the keyboard (18), a menu is displayed and copied if necessary.

Next, HDLC (High
Level Date Link Control P
rocedures) method is adopted.

The features of this HDLC are as follows.

(1) In the basic procedure, there are restrictions on the information to be transmitted, and there is a lack of independence between transmission control and terminal control. In contrast,
In HDLC, transmission is bit-oriented, and transmission control and information are completely independent, and information of any bit pattern can be transmitted by any number of bits.

(2) In the basic procedure, so-called alternate monitoring transmission is performed. On the other hand, in HDLC, numbers are assigned to frames corresponding to blocks in the basic procedure, and up to the next 7 (255 in extended mode) frames can be postponed before confirming the response to one frame. You can respond to them all at once. Furthermore, it is possible to add an acknowledgment response to the frame received from the other station to the information frame, resulting in extremely high transmission efficiency.

(3) In the basic procedure, response codes and supervisory codes (ACK) are used.
, NAK, ENQ, etc.), but in HDLC, CRC (Cyclic Redundancy Clock, etc.) is assigned to all frames.
heck) bit is added to ensure high reliability of transmission.

(4) Full-duplex communication cannot be performed on a branch line in the basic procedure, but it is possible in HDLC.

(5) In HDLC, the frame format is unified and conceptually simple.

Further, the frame structure of HDLC is HDLC: In HDLC, a transmission unit is called a frame. As shown in Figure 6, a frame consists of a flag sequence called the F pattern for synchronization, an address field, a control field, an information (data) field, and a frame check sequence (F pattern) for error detection.
C8).

The F pattern is an 8-bit sequence of "011], 1110" and indicates the start/end of a frame. This flag sequence can serve both as the end of one frame and the start of the next frame.

In order to maintain the transparency of frame information, the sending side always sets a bit “0” to 1 immediately after five consecutive bits “1”.
Insert. On the receiving side, if the value immediately after five consecutive bits "1" is "011", it must automatically delete it.The F pattern is prevented from appearing within such information.

The address field is a field for specifying a secondary station, and the control field is a field for setting control information such as command/response type and sequence number. Upper level information is set in the information field.

There are three types of control fields.

The information transfer format (■ frame) is a frame for transferring information, and includes a sending sequence number, receiving sequence number,
Consists of P/F bit. The monitoring format (S frame) is used to confirm the reception of E-frames, request retransmission, and control such as - time suppression, and includes the reception sequence number, control function type,
Consists of P/F bit. The unnumbered format (U frame) is used to set the data link mode at the start of communication, disconnect at the end of communication, notify errors, etc., and consists of a control function type and a P/F bit.

"Effects of the Invention" Since the present invention is configured as described above, it is possible to arbitrarily select transmission time, resolution, color, black and white, and other transmission modes for transmission, and the receiving side also needs to first determine the transmission mode before responding. Image data can be received and played correctly.

Furthermore, the data stored in the memory can be freely retrieved and displayed or copied later.

Furthermore, it is not limited to information that has been printed or written on a flat sheet of paper, but can also transmit three-dimensional objects or landscapes photographed with a television camera.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of an image transmission device according to the present invention, FIGS. 2 and 3 are flowcharts, FIG. 4 is an explanatory diagram of v-RAM, and FIG. 5 is a front view of a television receiver. 6 are frame configuration diagrams of the HD LC system. (1)...TV receiver, (2)...TV camera, (3)...A/D conversion circuit, (4)...digitizing circuit, (5)...first (7)... ) V-RAM, (6)-
2nd (7) V-RAM, (7)...palette circuit,
(8)...D/A conversion circuit, (9)...floppy disk, (10)...deck, (11)...deck controller, (12)...main CPU, (13)...
)...Main RAM, (14)...Serial controller, (15)...Memory switching register, (16)
...Sub CPU, (17) ...Encoder, (18)
... Keyboard, (19) ... Modem, (20)
...Communication line, (21)...Telephone, (22)...
A landmark. =13-

Claims (2)

[Claims] (1) Image data captured by a television camera is digitally processed and stored in a video memory, and the data in the video memory can be communicated with a computer via a communication line via a modem. , a color mode, and a resolution mode, and includes a CPU having a function of determining the transmitted mode at the time of reception and commanding reproduction according to the mode. Transmission device. (2) The image signal is transmitted using HDLC (High Level).
DateLinkControlProcedures
) method according to claim 1.