JPH03261232A - Transmission method for facsimile broadcast - Google Patents

Abstract

PURPOSE:To attain reception recording with high resolution for a receiver coping with high resolution and reception recording with low resolution for a receiver coping with low resolution by dividing high resolution picture information into plural low resolution picture information divisions, compressing each division and sending them in time division. CONSTITUTION:When picture information 1 with high resolution is sent, picture information with high resolution is divided into plural sets of picture information with low resolution, divisions 3a-3d are sent in time division. Thus, the plural divisions 3a-3d received and decoded are synthesized by a high resolution oriented receiver and one of the divisions 3a-3d is decoded by a standard resolution oriented receiver to attain reception recording. Thus, picture information is received and recorded with a resolution in response to each function even in the case of the receiver having high resolution reception capability or the receiver having standard resolution reception capability.

Description

DETAILED DESCRIPTION OF THE INVENTION A) Field of Industrial Application The present invention relates to a facsimile broadcast transmission method for multiplexing and transmitting a facsimile signal with a television broadcast.

(Example) Conventional technology Starting in the 1960s, a facsimile broadcasting system was studied in which fixed images such as letters, figures, and photographs were transmitted using television broadcast radio waves and reproduced and recorded on the receiving side (Television Society Journal 1987). (See February 2016, etc.), and in February 1999, two methods, an analog method and a digital method, were reported to the Minister of Posts and Telecommunications (
Telecommunications Technology Council Report Consultation No. 15).

Among these, digital facsimile signals are sent out at a speed of 16 kbps, with frames 1111a as shown in FIG. 4 as one unit. In FIG. 4, PFX (brifix) is used to identify the DAT (data) part,
The DAT section is roughly divided into image signals and control signals. The receiver extracts the program selection signal from the PFX part of the facsimile signal sent in the time-series tlI command as shown in Figure 5, and selects the desired program by referring to the program number, page number, etc. contained therein. It is possible to selectively receive programs (Communication Technology 1989.5 reference WA).

Conventional facsimile broadcast originals have a resolution in the main scanning direction of 1728 pixels/215mm±1% and a scanning line density of 7.
7 lines/mm±1%, and a minimum scanning time of 10 ms/scanning line is guaranteed in each frame. Also,
In wired facsimile communication, high-resolution originals (
Resolution in main scanning direction is 3456 pixels/215mm±1%
, the scanning line density is 15.4 lines/mm±1%), the image signal is generally compressed and transmitted using the MMR encoding method. Further, the transmitter determines the resolution or encoding method of the transmitted original according to the capabilities of the receiver.

C) Problems to be solved by the invention Since facsimile broadcasting multiplexes signals onto television radio waves and transmits them, the transmission error rate is higher than that of wired systems, and the MMR encoding method, which does not allow even a single bit error, is used to compress the data. cannot be converted into Furthermore, since it is not possible to transmit according to the capabilities of the receiver, if high-resolution transmission is performed, a receiver that does not have that capability cannot receive it, so it is necessary to further transmit at standard resolution.

The present invention makes it possible to receive and record high-resolution image information (original documents) whether it is a receiver with high-resolution reception capability or a standard-resolution receiver, and improves transmission efficiency. The purpose is to

2) Means for Solving the Problems The present invention divides high-resolution image information into a plurality of low-resolution image information and compresses the divided image parts when transmitting high-resolution image information in facsimile broadcasting. , is characterized in that each divided portion is transmitted in a time-division manner.

E) Effect According to the above means, a high-resolution compatible receiver combines a plurality of received and restored divided parts, and a standard resolution compatible receiver restores one of the divided parts, thereby creating a reception record. It can be carried out.

f) Example Embodiments of the present invention will be described below with reference to the drawings.

The facsimile broadcast transmission method of the present invention includes the steps of decomposing high-resolution image information obtained from a document to be transmitted into a plurality of low-resolution image information, compressing each of the resulting divided parts, and This method includes the step of time-divisionally transmitting the divided portions, and is realized, for example, by a transmitting device configured as shown in FIG. 1(a).

That is, first, in the high-resolution image input section (1), a document to be transmitted is read by a high-resolution scanner (not shown) or the like and stored in an image memory (not shown) as shown in FIG. 1(b) and FIG. 2(a). Stored as high-resolution image information. The resolution of this image information is, for example, 3456 pixels in the main scanning direction.
215mm±1%, sub-scanning direction 15° 4 lines/mm
±1%.

Next, in the image dividing section (2), the image information is divided into small blocks of high-resolution image information, for example, blocks of 2 pixels vertically by 2 pixels horizontally, for example, into 4. Of the high-resolution image information in FIG. 1(b), only the pixels of I are extracted to create a low-resolution divided image Gl as shown in FIG. Divided image GI like
The high-resolution image information is divided into divided images GI,
Divide into Gll, Gnl, and G■. Each divided image has a low resolution equivalent to a standard image that can be received and recorded without processing by a standard resolution receiver (for example, 1728 pixels/215 mm ± 1% in the main scanning direction, 7° 7 lines/mm ± % in the sub-scanning direction) is the image information of the divided image memory〈
(not shown).

Next, each image portion GI-Gr/ is encoded by encoding units (3a) to (3).
In step d), the data is converted into facsimile code data compressed by MH or MR encoding. Furthermore, the encoding unit (3a)
~ (3d) is common and the above divided image memory is connected to the dividing unit (
2), it may be stored in the memory of the encoding unit after being encoded while being divided.

This facsimile code data is converted into a packet frame by a packet frame generator (4). An example of this packet framing will be explained. In facsimile broadcasting, as shown in FIG. 4, a signal composed of 32 packets as one frame is transmitted in frame units at approximately every 577 ms. Then, each divided image portion G I-G in one frame
Allocate rV to 8 packets in a time-division manner. The sequence of Shu and bucket packets may be set to 8 packets for each part, or may be sent out sequentially as parts I to (1) and parts (1) to (2). In order to make it possible to identify that each packet is an image obtained by dividing high-resolution image information, a fourth
The undefined portion of the PFX section in the figure is used. As an example of this PFX, conventional image signals b3 to b5 are set to 011 as image Gl (an image received and recorded by a standard resolution receiver), and as shown in the column of interpolated image signals in FIG.
Using 101 of 5, set b6 to A, b7 to B, A=0, B
When = 0, image Gll, when A = O, B = 1, image Gl
rl, A=1. B=1 is defined as image GIV. Then, after assembling the packet as shown in Fig. 4, the frame as shown in Fig. 4 is assembled to form a facsimile image signal sequence.
The TV transmitter multiplexes it with the TV audio signal and also with the video signal and sends it out. In the above, since the facsimile code length of each image part is naturally different, the end point of the code data is different for each part. Therefore, it is free to decide how to use the packet position used by the portion that ended earlier. For example, it may be used for other parts or may be used as a blank signal.

By transmitting the facsimile codes of the divided images mixed in each frame as in the above embodiment (FIG. 6(c)), the divided images GI-Gr/ are serially transmitted one screen at a time (one page) at a time. More effective transmission is possible than in the case of (FIG. 6(b)). That is, for example, if we consider the case where the lines for all days are continuous, in order to guarantee the minimum scanning time of 10 m5/scanning line in each frame mentioned above, it is necessary to have data of only 57 scanning lines at most in one frame. Can not. When compressed by MR encoding (K=4), the codes of 4 scanning lines are as follows.

(EOL+1) (White 1728) (White 0
) 1st scan line 0000000000011101000
11011100110101 (EOL+O+V(0)
) 2nd to 4th scanning linesoooooooooooo○101 The above code length is 72 bits long, so in the case of 57 scanning lines, approximately 1
The length is 000 bits. Image information in one frame is 32
Since the length is X22X8=5632 bits, the remaining 4632 bits are invalid at this time. However, according to this method, each divided image part within one frame is 8
Since it is a packet, the code length is 8×22×8=1408 bits. Therefore, in the case of this method, the invalid length is 408 bits for each divided image portion, and the length for one frame is 408×4=1632 bits. From this, it can be said that this method is more efficient than serially transmitting the divided images GI to GIV one screen at a time.

Further, the transmission efficiency is also better compared to the case where a high-resolution original is sent separately into a high-resolution program and a standard-definition program (FIG. 6(a)). In other words, for high-resolution programs, the amount of original image information is the same as in this method, and in terms of compression efficiency, the amount of transmitted data is generally less than in this method, but since standard-definition programs are transmitted separately, the amount of data is larger. Become. Also,
As shown in FIG. 5, six frames of time are required between programs. Therefore, when considering the whole, it can be considered that the system shown in FIG. 6(C) occupies a shorter time for high-resolution programs. In this way, high resolution image information can be efficiently transmitted.

Furthermore, on the receiving side, if the device supports low (standard) resolution, only the GI of facsimile image information is transferred to PFX.
The information is extracted based on the identification information, decoded, and recorded. In addition, if it is compatible with high resolution, divided images Gl~GTV
After decoding each, it is possible to combine them and restore and record a high-resolution image signal.

In the above embodiment, the high-resolution original has a resolution in the main scanning direction of 3456 pixels/215 mm±1% and a scanning line density of 15.4 lines/mm±1%, but the present invention is not limited to this. . For example, if a high-resolution original has a resolution in the main scanning direction of 1728 pixels/215 mm ± 1% and a scanning line density of 15.4 lines/mm ± 1%, when it is divided into standard resolution, it will be divided into two parts in the sub-scanning direction. do it. Also, the number of packets for each part in one frame is 8 packets, but considering the minimum scanning line time, the number of packets allocated to each part can be varied.

No.

g) Effects of the Invention According to the present invention, high resolution image information in facsimile broadcasting can be transmitted at high resolution in a high resolution compatible receiver.
For low resolution receivers, this has great effects such as being able to receive and record at low resolution.

[Brief explanation of drawings]

Claims (2)

[Claims] (1) A facsimile broadcast transmission method in which a facsimile signal is multiplexed and transmitted on a television broadcast signal, which includes the steps of dividing high-resolution image information into a plurality of low-resolution image information parts, and compressing each of the divided parts. , a facsimile broadcast transmission method including the steps of time-divisionally transmitting a plurality of compressed divided parts. (2) The facsimile broadcast transmission system according to claim (1), characterized in that the facsimile codes of each divided portion are mixed and transmitted within the frame of the image signal.