JPH09205524A - Facsimile equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the facsimile equipment of double side simultaneous read type with high reliability at a low cost. SOLUTION: Front side image data and rear side image data read by a front side read sensor 1 and a rear side read sensor 2 are subject to parallel compression processing by two systems of data compression sections 13, 23 and the resulting data are transferred to a storage transfer memory 3. The image data transferred and stored in the storage transfer memory 3 are read in the order of the front side and the rear side and then transmitted. A difference from compression processing speeds is caused depending on the difference from the front and rear side image information amounts of an original when the front side image data and rear side image data are subject to parallel compression processing by the two systems of data compression sections 13, 23. A scanning control section 9 conducts sub scanning control in matching with the parallel compression processing speeds which is slower caused by the difference from the front and rear side image information amounts to simplify the circuit configuration.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facsimile apparatus for simultaneously reading and transmitting double-sided originals, and more particularly to a cost reduction and an improvement in reliability.

[0002]

2. Description of the Related Art In recent years, the number of originals on both sides has increased in order to spread the use of copying machines capable of copying on both sides and to reduce the consumption of recording paper. In order to deal with the double-sided original, a facsimile apparatus capable of reading and transmitting the double-sided original has been developed as disclosed in, for example, Japanese Patent Laid-Open No. 7-160953. The document reading mechanism of the facsimile apparatus capable of transmitting both sides includes one that sequentially reads the front and back of the document by the document reversing mechanism and one that simultaneously reads image information on the front and back of the document.

As shown in FIG. 5, a facsimile apparatus for simultaneously reading image information on the front and back sides of a document has a document transport path 51 as shown in FIG.
A reading unit 52 having the front surface reading sensor 1 and a reading unit 53 having the back surface reading sensor 2 are arranged with the front side reading sensor 1 and the back side reading sensor 2 arranged therebetween, and the image information of the front and back sides of the document is displayed on the scan lines which are shifted in the sub-scanning direction to prevent show-through. Read at the same time. In this facsimile apparatus, image information read by the front surface reading sensor 1 and the back surface reading sensor 2 is sequentially accumulated in image memories 54 and 55 for front and back sides, as disclosed in, for example, Japanese Patent Laid-Open No. 7-160953. It The image information stored in the image memories 54 and 55 is read from the gate circuit 56 one by one, compressed, and transmitted. In this way, the image memory 5
Since Nos. 4 and 55 are used, the original can be conveyed, read, and processed at a constant speed regardless of the processing speed of data compression.

[0004]

As described above, the facsimile apparatus for simultaneously reading the image information on the front and back sides of the original does not require an original reversing mechanism and has a simple mechanical structure, so that the reliability can be ensured and the original can be obtained. Although it has the advantage that it can be read at high speed, it requires image memories for storing image information on the front and back sides of the original, and these two sets of image memories are expensive, and the price occupies a considerably high ratio in the entire apparatus.

Further, there is a problem that the next original cannot be read unless the compression and transfer processing of the image information on the front and back sides of the original are completed, and the throughput is not good for the price.
In order to solve this, it is sufficient to have four times as many sets of image memories so that the next original can be read while the first original is being compressed, and it is possible to switch and use two sets each, but it is more expensive. Become.

Further, it is possible to provide a data compressor capable of processing an original having any information density without stopping and a system system capable of processing and transferring compressed data. In this case, a hard disk is used.
A data compressor that can perform sequential compression processing even for data that has a large number of change points, such as a screen image, and, in some cases, generated code data that increases more than the raw data. A high speed data transfer circuit is required to transfer the data to the data storage file, which is also expensive.

The present invention has been made in order to solve the above disadvantages, and an object thereof is to obtain a facsimile apparatus of a double-sided simultaneous reading system which is low in cost and high in reliability.

[0008]

SUMMARY OF THE INVENTION In a facsimile apparatus according to the present invention, both sides of a document are simultaneously read by two reading means, and the image information of the read document is separately read side by side by the two compressing means. A facsimile apparatus that compresses data, transfers the data to a storage / transfer memory, reads the data from the storage / transfer memory in order from the front to the back, and transmits the data. The sub-scanning control is performed to a slower parallel compression processing speed caused by a difference in front and back image information amount. The feature is that they are performed together.

A compression speed buffer may be provided before the above two systems of compression means.

Further, in another facsimile apparatus according to the present invention, both sides of a document are simultaneously read by the reading means of two systems, and the image information of the front and back sides of the read document is time-divisionally compressed by one compression means. Then, the data is transferred to the storage / transfer memory, read from the storage / transfer memory in order of front and back, and transmitted.

Further, both sides of the original are simultaneously read by the two reading means, and the binary image processing of the image information on the front and back of the read original is time-divisionally processed by one image processing means and sent to the compression means. You can

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, a facsimile having a front surface reading sensor for reading image information on the front surface of a document and a back surface reading sensor for reading image information on the back surface of the document, and reading image information on the front and back sides of the document at the same time. The apparatus has two systems of data compression units for compressing front and back image information, respectively, and front and back image data are processed in parallel by two systems of data compression units. Transfer to storage transfer memory. The stored front image data and back image data transferred to the storage transfer memory are read out in order of front and back and transmitted. In this way, when the front and back image information of the original is read and the front and back image data are subjected to parallel compression processing by the two-system data compression unit, the front and back image information amount of the original is The difference causes a difference in compression processing speed. Therefore, the scanning control unit performs sub-scanning control in accordance with the slower parallel compression processing speed caused by the difference in the front and back image information amounts, thereby simplifying the circuit configuration.

Further, a buffer buffer is provided in front of the two-system data compressing section to suppress the fluctuation or reduction of the sub-scanning speed due to the difference in the front and back image information amount of the document.

Further, the front image data and the back image data read by the front surface reading sensor and the back surface reading sensor are time-divisionally processed by one data compression unit, or the front image data and the back image data are processed. -Ta 1
The circuit configuration is further simplified by alternately performing time-division processing in one image processing unit.

[0015]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. As shown in the figure, a facsimile apparatus that simultaneously reads image information on the front and back of a document has a front surface reading sensor 1 that reads image information on the front surface of the document and a back surface reading sensor 2 that reads image information on the back surface of the document. The surface image data read by the front surface reading sensor 1 is binarized by the image processing unit 11, compressed by the data compression unit 13, and transferred to the storage transfer memory 3. The backside image data read by the backside reading sensor 2 is binarized by the image processing unit 21, compressed by the data compression unit 23, and stored in the transfer memory 3.
Is forwarded to The stored front image data and back image data transferred to the storage transfer memory 3 are read in order of front and back,
The data is expanded by the data expansion unit 4 and sequentially stored in the line buffer 5. The image data stored in the line buffer 5 is compressed by the data compression unit 6 and transmitted via the modem 7 and the network control unit 8.

In this way, the image information on the front and back sides of the original is read and the front and back image data are compressed by the data compression units 13 and 23.
During the parallel compression process, the compression processing speeds of the data compression units 13 and 23 differ due to the difference in the front and back image information amount of the document. Therefore, the scanning control unit 9 performs sub-scanning control according to the slower parallel compression processing speed caused by the difference in the front and back image information amount. That is, the sub-scanning motor drive unit 10 is controlled intermittently or at a variable speed to drive the read pulse motor 11 in accordance with the slower compression / transfer operation for front / back parallel processing. For example, if the front side image has a large amount of information and the back side has a small amount of information, and if the front side compression process is not in time, even if the back side process is in time, the sub-scanning is stopped according to the front side, and the front side reading sensor 1 and the acquisition of image information from the back surface reading sensor 2 are temporarily stopped. By performing the sub-scanning control in accordance with the slower parallel compression processing speed in this manner, neither the page memory nor the high speed compressor is required, the circuit configuration can be simplified and the cost can be reduced. .

In the above embodiment, the image processing units 11 and 21 are used.
The case where the image-processed data is directly sent to the data compression units 13 and 23 has been described. However, as shown in the block diagram of FIG. 2, the image processing units 11 and 21 and the data compression unit 1
Buffer buffers 12 and 22 may be provided between 3 and 23, respectively. By providing the buffer buffers 12 and 22 in front of the data compression units 13 and 23 in this manner, it is possible to considerably suppress the fluctuation or reduction of the sub-scanning speed due to the difference in the information amount of the front and back images of the document without the page memory. it can.

In each of the above-described embodiments, the case where the front image data and the back image data read by the front surface reading sensor 1 and the back surface reading sensor 2 are subjected to parallel compression processing by the data compression units 13 and 23 will be described. However, as shown in the block diagram of FIG.
In the data compression unit 33, the front image data and the back image data are line by line,
Time-division processing may be performed in block units. In this way, by performing the time-division processing by one data compression unit 33, it is not necessary to have a data compression unit for each of the front image data and the back image data, and the circuit configuration is further simplified. You can
The price can be reduced.

Further, the case has been described in which the front image data and the back image data are time-divisionally processed by the single data compression section 33. For example, as shown in the block diagram of FIG. The image data and the back image data may be alternately time-divisionally processed by the image processing unit 31. In this case, the front image data and the back image data read by the front surface reading sensor 1 and the back surface reading sensor 2 are alternately time-divisionally processed by the image processing unit 31. The front image data and the back image data that have been subjected to the image processing alternately by the image processing unit 31 are sent to the data compression unit 43. Data compression unit 43
Compresses the front image data and the back image data which are time-divided and alternately sent. In this way, the image processing unit 31 and the data compression unit 43 can be combined into a single system like a conventional single-sided reading facsimile apparatus to realize double-sided simultaneous reading. In this case, for example, a line buffer for storing shading information, a line buffer for separately storing front and back image data, and the like may be provided separately for the front and back sides and switched for each line. .

[0020]

As described above, the present invention has the front side reading sensor for reading the image information on the front side of the original document and the back side reading sensor for reading the image information on the back side of the original, and the image information on the front and back sides of the original is simultaneously read. A facsimile machine for reading has two systems of data compression units for compressing front and back image information, respectively, and reads the front and back image information of a document to provide two systems of front and back image data. The sub-scanning control is performed according to the slower parallel compression processing speed caused by the difference between the front and back image information amounts during the parallel compression processing in the data compression unit, thus simplifying the circuit configuration. Therefore, the price can be reduced, and the reliability can be improved.

Further, a buffer buffer is provided in the preceding stage of the two-system data compression section, so that it is possible to suppress the fluctuation or reduction of the sub-scanning speed due to the difference in the front and back image information amount of the document, and to stably read the image. Processing can be performed.

Further, the front image data and the back image data read by the front surface reading sensor and the back surface reading sensor are time-divisionally processed by one data compression unit, or the front image data and the back image data are processed. -Ta 1
By alternately performing time-division processing by one image processing unit, the circuit configuration can be further simplified, and a low-priced double-sided simultaneous reading facsimile device can be provided.

[Brief description of drawings]

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

FIG. 2 is a block diagram showing a configuration of a second embodiment.

FIG. 3 is a block diagram showing a configuration of a third embodiment.

FIG. 4 is a block diagram showing a configuration of a fourth exemplary embodiment.

FIG. 5 is a configuration diagram showing a conventional example.

[Explanation of symbols]

 1 Front Side Reading Sensor 2 Back Side Reading Sensor 3 Storage Transfer Memory 11 Image Processing Section 21 Image Processing Section 12 Buffer Buffer 22 Buffer Buffer 13 Data Compressing Section 23 Data Compressing Section 31 Image Processing Section 33 Data Compressing Section 43 Data -Data compression unit

Claims (4)

[Claims] 1. Both sides of a document are simultaneously read by two reading means, and the image information of the read document is separately compressed in parallel by front and back by the two compressing means and transferred to a storage transfer memory. A facsimile device which reads out from a storage transfer memory in order from front to back and transmits, wherein the sub-scanning control is performed in accordance with a slower parallel compression processing speed caused by a difference in front and back image information amount. 2. A facsimile apparatus according to claim 1, further comprising a buffer buffer in front of said two systems of compression means. 3. Both sides of an original are read simultaneously by two reading means, and image information on the front and back sides of the read original is time-divisionally compressed by one compression means and transferred to a storage transfer memory for storage. A facsimile machine characterized by reading from a transfer memory in order of front and back and transmitting. 4. Both sides of an original are simultaneously read by two reading means, and binary image processing of image information on the front and back sides of the read original is time-divisionally processed by one image processing means and sent to a compression means. A facsimile machine characterized by.