JPS61222378A - Transmitting system for image of facsimile - Google Patents

Abstract

PURPOSE:To reduce the transmitting time of image information by abolishing a fill bit for adjusting the time among image encoding signals and arranging an idle signal that complements time delay between a transmitter-receiver at every frame. CONSTITUTION:Encoding data DATA1-16 for one line consist of only image data without inserting a fill bit regardless of minimum transmitting time. And the image is transmitted by transmitting plural frames setting the encoding data having share of prescribed lines DATA1-16 as one frame. Furthermore, the idle signal is arranged between every frame to complement the time delay between the transmitter-receiver. And an apport pattern is sent as a completion signal behind the last frame.

Description

[Detailed Description of the Invention] [Summary] A facsimile image transmission method that eliminates fill pits in one line of coded data and reduces the time difference between transmission and reception in a frame composed of multiple lines of coded data. By inserting and adjusting an idle signal between the first frame and the next frame, the facsimile image transmission time was reduced.

[Industrial application field]

The present invention relates to a facsimile image transmission system, and more particularly to a facsimile transmission system that can improve transmission speed.

[Conventional technology]

The facsimile communication specifications have traditionally been G2, G
G3 specifications facsimile uses the MH method (Modified Huff+san method) and the MR method (Modified READ method) as image encoding methods. In the MR method, when the K parameter is set to 4,
First, the information on the first line, which is the standard, is transmitted using one-dimensional group coding, and following this first line, the second to fourth information is transmitted using two-dimensional group coding, and the transmission of these four lines is repeated. All images are then transmitted. As for the actual signal, as shown in Figure 3, first, the -dimensional EOL signal (
ENDOFLINE code), then sends DATA I encoded using the one-dimensional group coding method, followed by two-dimensional E
DATA2 encoded with OL code, two-dimensional encoding method
, and the following similarly, the EOL code, DATA3. EOL code, D
ATA4, and all images are transmitted by repeating this process.

In this transmission method, the minimum transmission time T per line is determined by the recording speed on the receiving side and the document reading speed on the sending side, and the transmission time of one line of information is determined by the minimum transmission time T. If not, insert a fill pit after the image information as a time adjustment and start the next EO.
The time it takes to output the L code is set to the minimum transmission time (shown in the first and second lines in Figure 3), and the transmission time of 1947 minutes of information is the minimum transmission time. If the minimum transmission time is exceeded (for example, To), the transmission is continued beyond the minimum transmission time (as shown in the third line in FIG. 3).

Therefore, the time required to transmit all the information is longer than the minimum transmission time times the total number of ins by the amount exceeding the above-mentioned minimum transmission time.

[Problem that the invention seeks to solve]

Incidentally, in recent years, in order to reduce line charges, facsimile machines with as short transmission time as possible have been desired, but in the conventional facsimile image transmission method described above, the transmission time is calculated by multiplying the minimum transmission time of one line by the total transmission time. However, the above request cannot be met.

[Means for solving problems]

In order to solve the above-mentioned problems and shorten the image transmission time, the present invention, as shown in FIG. The image is transmitted by transmitting a plurality of frames, each consisting of a predetermined line of coded data as one frame, and an idle signal is placed between each frame to compensate for the time delay between the transmitter and the receiver.

〔Example〕

Embodiments of the facsimile image transmission system according to the present invention will be described below.

1 and 2 show an embodiment of a facsimile image transmission system according to the present invention. In this embodiment,
The MR method is adopted as the image encoding method as in the past. Then, as in the past, when the K parameter is set to 4, DATAI is sent in which the reference first line information is encoded using a one-dimensional encoding method. In this case, firstly, the -dimensional E
The OL code is sent, then the DATAI is sent, and the second code is coded using the two-dimensional coding method. 3rd and 4th line information DATA2, DATA3.

Send DATA4. At this time, each DATA contains only data of one image without inserting fill pits, regardless of whether it is shorter or longer than the minimum transmission time.

Then, 4 sets of similar 4 lines of information, 1 set of 16 lines of information, and a CRC signal (
Cyclic Redundancy Check)
is attached to indicate one frame.

Then, a predetermined number of frames are transmitted to transmit the image, but if the reading speed of this l frame information is faster than the transmission speed and recording speed, there is normally only one frame between frames. The flag signals that are inserted as many times as necessary for time adjustment are continuously transmitted as idle signals. After the last frame, an abort pattern is sent as an end signal of the image signal, instead of adding RTC (6 or more EOLs), which has been done conventionally.

To send an image signal based on the tree method, follow the flowchart shown in Figure 2. First, after sending one frame, before sending the next frame, the information that has been sent and the number of bytes of the next frame to be sent. and the memory capacity on the receiving side. That is, it is determined whether or not it is possible to send the primary frame.

If it is possible to send the next frame, it will send the next frame, and if it cannot be sent, it will send the flag continuously and use it as an idle signal, waiting for the memory on the receiving side to become ready to accept information, and then send the next frame. Send. This is repeated in sequence, and after transmitting the final frame, the apartment pattern is transmitted, and the transmission of the image signal is completed.

Therefore, according to this embodiment, since no fill bit is added to the image data, the receiving side does not store unnecessary information for image regeneration, and the transmission speed of image information can be improved. Furthermore, since the EOL code added before the two-dimensional encoded information has been abolished, it is possible to further speed up information transmission.

〔Effect of the invention〕

As explained above, according to the present invention, since the time adjustment filter (t) in the image encoded signal is abolished,
This has the effect that the transmission time of image information can be shortened.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an embodiment of the facsimile image transmission method according to the present invention, FIG. 2 is a flowchart showing the transmission procedure of the facsimile image transmission method shown in FIG. 1, and FIG. FIG. 3 is a diagram showing an image transmission method.

Claims (1)

[Scope of Claims] Encoded data for one line of image is composed of only image data regardless of the minimum transmission time of a transmitter/receiver, and encoded data for a predetermined line is regarded as one frame, and a plurality of frames are transmitted. A facsimile image transmission method characterized in that an idle signal is placed between each frame to compensate for the time delay between the receiver and the transmitter.