JP3349894B2 - Control method for facsimile machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a control method for a facsimile apparatus having a function of processing image information by a JBIG coding method.

[0002]

2. Description of the Related Art In recent years, the so-called JBIG system has been widespread as a high-efficiency coding system for black-and-white binary image data. Like 85, it has been adopted as a coding method for facsimile apparatuses.

[0003] Image information (hereinafter referred to as JBIG image information) according to the JBIG encoding method is defined as a binary image body BIE as shown in FIG. 7 (a). As shown in FIG. 3B, the image data is composed of a binary image header BIH and binary image data BID.
(Note that the following description is based on ITU-T Recommendation T.85, and for the exact content of each term and the details of the JBIG system itself, refer to the Recommendation.)

As shown in FIG. 1C, a binary image header BIH includes data DL representing a lowest resolution layer,
Data D representing the final resolution layer, data P representing the number of bit planes, data XD representing the size in the horizontal direction, data YD representing the size in the vertical direction, and data L0, AT representing the number of lines per stripe of the lowest resolution. Adaptive template) data MX representing the maximum horizontal offset in pixels, data MY representing the maximum vertical offset in AT pixels,
It consists of order data that defines the order of the stripe data forming the binary image data BID, and option data that defines options.

[0005] The option data includes data LRLTW indicating that a two-line template is selected.
O, NEWLENTH data VLENTH indicating whether or not a marker is used, data TPDON indicating whether the TP of the differential layer can be used, TPBON indicating whether the TP of the base layer can be used, data DPON indicating whether the DP can be used, and private DP. Data DPPRIV indicating whether the table can be used and data DPLA indicating whether the last DP table can be used
ST is included. Note that these data LRLTWO,
VLENTH, TPDON, TPBON, DPON,
DPPRIV and DPLAST are each 1-bit data.

As shown in FIG. 1 (d), the binary image data BID includes one or more stripe data bodies obtained by combining code data of a predetermined number of lines (hereinafter referred to as "stripe") of the original image. One or more SDEs are included. In addition, floating marker information for controlling information can be inserted between stripe data bodies SDE or before the first stripe data body SDE.

The stripe data body SDE is shown in FIG.
As shown in the figure, the protected stripe code data PSCD which is the main body of the code data, a predetermined code ESC,
And data SDRST or SDNORM. In addition, data SDRST or data SDNORM
Is to indicate whether to reset the state of the data being encoded before processing the next stripe data or to carry over to the processing of the next stripe data.

The floating marker information includes an ATMOVE marker indicating a position of an AT pixel, a NEWLEN marker indicating a change in vertical size, and a COMMENT marker indicating a private comment.
The type is defined and can be specified as appropriate.

Here, the NEWLEN marker is used in the binary image header BIH to change the vertical size defined by the data YD, and as shown in FIG. 1F, the code ESC, the code NEWLEN, and ,
It consists of vertical size data YD. Also, this NE
When the WLEN marker is added, data “1” is set in the data VLENTH of the option data.

In a facsimile apparatus, there is a case where a so-called direct transmission mode in which image data read by a scanner is transmitted to the other party while being encoded. In this case, the number of lines of image data per page is not known until reading of the document image is completed.

On the other hand, in one binary image body BIE constituting JBIG image information, the data Y of the binary image header BIH
In D, the number of lines of the encoded original image data is shown. However, when the image information is transmitted in the above-described direct transmission mode, it is necessary to know the number of lines of the image data before starting the encoding. Since it is not possible, in this case, a NEWLEN marker inserted into the binary image data BID is used, and is usually arranged next to the last stripe data body SDE. In this case, the binary image header BIH
Is set to the data VLENTH of the option data.

[0012]

Therefore, when receiving the JBIG image information, the receiving side checks whether or not data "1" is set in the data VLENTH of the binary image header BIH to be received first. And data VL
If the data "1" is set in ENGTH, each stripe data body SDE of the received binary image data BID is encoded, and then a NEWLEN marker is received to determine the actual number of lines of image data. Then, the decoding process needs to be stopped.

It is necessary to determine whether or not to stop the decoding process because the JBIG system does not define the code data for determining the end of the code data. Judge the number of data lines,
This is because it is necessary to determine the end of the image data.

The present invention has been made in view of such circumstances, and has as its object to provide a method of controlling a facsimile apparatus that can appropriately decode JBIG image information.

[0015]

SUMMARY OF THE INVENTION The present invention relates to a method for controlling a facsimile apparatus having a function of encoding and decoding image information in a JBIG encoding system. The header information of the image information is analyzed to determine whether the NEWLEN marker is used in the JBIG image information. When the NEWLEN marker is used, the received JBIG
Find the NEWLEN marker from the image information,
Recognizing the total number of lines of the image information indicated by the EWLEN marker and decoding the received JBIG image information until the number of lines of the decoded image data matches the recognized total number of lines. , Decryption processing.

In a control method for a facsimile apparatus having a function of encoding and decoding image information in the JBIG encoding method, when JBIG image information is received, the header information of the received JBIG image information is analyzed. And that J
It checks whether or not the NEWLEN marker is used in the BIG image information. When the NEWLEN marker is used, when decoding the received JBIG image information, a total line of the image information indicated by the found NEWLEN marker is used. The number is recognized, and the number of lines of the decoded image data is limited to the recognized total number of lines.

In a control method of a facsimile apparatus having a function of encoding / decoding image information by a JBIG encoding method, when the image information is received, a JBIG is transmitted to the transmitting side.
While notifying that only the basic IG system is provided, and receiving JBIG image information, the received JBI
The header information of the G image information is analyzed to check whether the NEWLEN marker is used in the JBIG image information. When the NEWLEN marker is used,
When decoding the received JBIG image information, the total number of lines of the image information indicated by the found NEWLEN marker is recognized, and the number of lines of the decoded image data is changed to the recognized total number of lines. It is intended to be restricted.

[0018]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
An embodiment of the present invention will be described in detail.

FIG. 1 shows a group 3 facsimile apparatus according to one embodiment of the present invention.

In FIG. 1, a control unit 1 performs a control process of each unit of the facsimile apparatus and a facsimile transmission control procedure process.
The control unit 1 stores a control processing program to be executed by the control unit 1 and various data necessary for executing the processing program, and also constitutes a work area of the control unit 1 such as a page memory. , For storing various information unique to the group 3 facsimile apparatus.

The scanner 4 is for reading a document image at a predetermined resolution, the plotter 5 is for recording and outputting an image at a predetermined resolution, and the operation display section 6 is a facsimile apparatus. To operate,
It consists of various operation keys and various indicators.

The encoding / decoding section 7 encodes and compresses the image signal and decodes the encoded and compressed image information into the original image signal.
It has a coding / decoding function of both the R system, the MMR system, and the JBIG system. The image storage device 8 is for storing a large number of image information in a coded and compressed state.

The group 3 facsimile modem 9 is for realizing a group 3 facsimile modem function, and exchanges a transmission procedure signal (a low-speed modem function (V.21 modem)) and mainly exchanges image information. High-speed modem function (V.34 modem, V.34
17 modem, V.I. 29 modem, V.29. 27ter modem etc.).

The network control device 10 is for connecting the facsimile apparatus to a public telephone line network and has an automatic transmission / reception function.

The control unit 1, the system memory 2,
The parameter memory 3, the scanner 4, the plotter 5, the operation display unit 6, the encoding / decoding unit 7, the image storage device 8, the group 3 facsimile modem 9, and the network control device 10
It is connected to the internal bus 11, and data exchange between these elements is mainly performed via the internal bus 11.

Data exchange between the network controller 10 and the group 3 facsimile modem 9 is directly performed.

FIG. 2 shows an example of processing when an incoming call is detected according to an embodiment of the present invention.

When an incoming call is detected, an incoming call is answered (process 10).
1) A predetermined called station identification signal CED is transmitted (step 10).
2) a non-standard function identification signal NSF for notifying a non-standard device function (for example, the JBIG system) provided in the own terminal, and a standard device function provided in the own terminal. Digital identification signal DIS for notification
Is sent (process 103).

When the non-standard function setting signal NSS is received from the partner terminal (step 104), it is checked whether or not the coding system specified at that time is the JBIG system (decision 105). When the result of determination 105 is YES, a predetermined modem training procedure is executed at the designated modem speed (process 106), a modem speed to be used at that time is determined, and a predetermined reception procedure is started (process 106). 107).

Here, the option data of the binary image header BIH of the received binary image body BIE is checked, and data "1" is set in the data VLENTHH.
It is checked whether or not the use of the EWLEN marker is specified (decision 108), and the result of the decision 108 is YE
If S, the received JBIG image information is temporarily stored in the image storage device 8 (process 109). Also, judgment 10
If the result of step 8 is NO, the encoding / decoding section 7 decodes the received JBIG image information to form original image data, and the plotter 5 records and outputs the image of the image data (step 110).

When the reception of the image information is completed, a predetermined post-transmission procedure is executed (step 111), and the line is restored (step 1).
12), a series of image information receiving operation ends.

When the encoding method of the image information specified by the partner terminal is the normal method and the result of determination 105 is NO, a normal image information receiving process is executed (process 1).
13) When this image information receiving process is completed, the process 112
Then, the line is restored, and a series of image information receiving operations is terminated.

When the JBIG image information is stored when the image information is received, the processing shown in FIG.
The IG image information is decoded, and the image of the obtained image data is recorded and output from the plotter 5.

First, N is obtained from the accumulated JBIG image information.
Until an EWLEN marker is detected, the JBIG image information data is scanned (NO loop of determinations 201 and 202). When the NEWLEN marker is detected and the result of determination 201 is YES, the value of the total number of lines indicated by the data YD is substituted for the variable LA (process 203).

Next, the value of a counter LC for counting the number of decoded lines is initialized to "0" (step 204), and decoding processing of JBIG image information is performed. That is, the encoding / decoding unit 7 decodes one line of JBIG image information (processing 205), increases the value of the line counter LC by one (processing 206), and converts the decoded image data of one line into a page. The data is stored in the buffer in the line order (process 207).

Then, it is checked whether or not the value of the line counter LC is larger than the value of the variable LA (decision 208). When the result of the decision 208 is NO, the JBIG image information data It is checked whether or not all the decoding processes have been completed (determination 209). If the result of determination 209 is NO, the image data of the designated number of lines has not been formed, so the process 205
And the decoding process of the remaining image data is performed.

When the result of the judgment 208 is YES and when the result of the judgment 209 is YES, the decoding process of the received JBIG image information has been completed, and the JBIG image information is stored in the page memory at that time. The image data for one page is transferred to the plotter 5, and the received document for one page is recorded and output (process 210).

As described above, in this embodiment, when the received JBIG image information indicates that the NEWLEN marker is used, the received JBIG image information is used.
G image information is temporarily stored, and N is obtained from the stored JBIG image information.
The EWLEN marker is searched for, and based on the accumulated JBIG image information, the image data of the total number of lines specified by the NEWLEN marker is decoded and formed, so that no unnecessary image data is formed.
The document image read on the transmission side can be appropriately reproduced.

FIG. 4 shows an example of processing when an incoming call is detected according to another embodiment of the present invention.

When an incoming call is detected, an incoming call is answered (step 30).
1) A predetermined called station identification signal CED is transmitted (process 30).
2) a non-standard function identification signal NSF for notifying a non-standard device function (for example, the JBIG system) provided in the own terminal, and a standard device function provided in the own terminal. Digital identification signal DIS for notification
Is transmitted (process 303).

When the non-standard function setting signal NSS is received from the partner terminal (step 304), it is checked whether or not the coding system specified at that time is the JBIG system (decision 305). When the result of determination 305 is YES, a predetermined modem training procedure is executed at the designated modem speed (process 306), the modem speed to be used at that time is determined, and a predetermined reception procedure is started (process 306). 307).

Next, the value of a counter LC for counting the number of decoded lines is initialized to "0" (process 3).
08), the encoding / decoding unit 7 decodes one line of JBIG image information (processing 309), and the line counter LC
Is increased by one (step 310), and the decoded image data for one line is stored in the page buffer in the line order (step 311).

Here, it is checked whether or not the NEWLEN marker has been detected (judgment 312). If the result of the judgment 312 is YES, the value of the total number of lines indicated by the NEWLEN marker data YD is substituted for the variable LA. (Step 313). When the result of the determination 312 is NO, the process 313 is not executed.

Then, it is checked whether or not all decoding processing of the JBIG image information data has been completed (decision 31).
4) If the result of determination 314 is NO, process 3
Returning to step 09, decoding processing of the remaining image data is performed.

When the decoding of all the JBIG image information data is completed and the result of determination 314 is YES, a procedure for ending reception of image information for one page is executed (process 315). Then, it is checked whether or not the value of the line counter LC at that time is larger than the value of the variable LA (decision 316), and if the result of the decision 316 is YES, of the image data saved in the page memory, Image data other than the portion from one line to the number of lines indicated by the variable LA is deleted from the page memory (process 3).
17). When the result of the determination 316 is NO, the process 317 is not executed.

When the image data for one page is arranged in the page memory in this way, the image data for one page stored in the page memory is transferred to the plotter 5, and the received original for one page is copied. Record and output (Process 31
8).

Next, it is checked whether the transmission of the next page has been notified from the partner terminal (decision 31).
9) When the result of the determination 319 is YES, the process returns to the process 308 to perform the image information receiving operation of the next page.

If the result of the determination 319 is NO, the line is restored according to a predetermined termination procedure (Step 3).
20), a series of image information receiving operations ends.

When the encoding method of the image information notified from the partner terminal is the normal method, the result of decision 305 is NO.
, A normal image information receiving process is executed (process 321).
0, restore the line according to the predetermined termination procedure,
A series of image information receiving operation ends.

As described above, in this embodiment, when the decoding process forms image data of a total number of lines or more designated by the NEWLEN marker, the number of lines of the image data is designated by the designated number. Since the number of lines is limited, the original image read on the transmission side can be appropriately reproduced without forming useless image data.

In the above-described embodiment, the data capacity of the page memory requires a data capacity capable of holding one page of image data. However, the data capacity required for the page memory can be reduced. FIG. 5 and FIG. 6 show processing at the time of reception according to still another embodiment of the present invention.

In this case, when an incoming call is detected, an incoming call is answered (process 401), a predetermined called station identification signal CED is sent out (process 402), and non-standard device functions (for example, (Basic method such as JBIG method)
A non-standard function identification signal NSF for notifying
A digital identification signal DIS for notifying a standard device function provided in the terminal itself is transmitted (process 40).
3).

Then, when the non-standard function setting signal NSS is received from the partner terminal (step 404), it is checked whether or not the coding system designated at that time is the JBIG system (decision 405). If the result of decision 405 is YES, a predetermined modem training procedure is executed at the designated modem speed (process 406), the modem speed to be used at that time is determined, and a predetermined reception procedure is started (process 406). 407).

Next, the value of a counter LC for counting the number of decoded lines is initialized to "0" (process 4).
08), the encoding / decoding unit 7 decodes one line of the JBIG image information (processing 409), and the line counter LC
Is increased by one (process 410), and the decoded image data for one line is converted to 128
The data is stored in a page buffer having a data capacity of 128 lines corresponding to the stripes of the lines in the line order (process 411). In the basic method of the JBIG method, the size of the above-described sprite is defined as 128 lines. Therefore, in this case, each stripe data body SDE of the binary image data BID includes one of the original images.
Code data not exceeding 28 lines is included.

Here, it is checked whether or not the NEWLEN marker has been detected (judgment 412). If the result of the judgment 412 is YES, the value of the total number of lines indicated by the NEWLEN marker data YD is substituted for the variable LA. (Step 413). When the result of the determination 412 is NO, the process 413 is not executed.

It is checked whether image data of 128 lines, which is one stripe, has been formed (decision 41).
4) If the result of determination 414 is YES, the image data for 128 lines of the data buffer is
To record and output the image of that portion (Process 4
15). When the result of the determination 414 is NO, the process 415 is not executed.

Then, it is determined whether or not all decoding processing of the JBIG image information data has been completed (decision 41).
6) If the result of determination 416 is NO, process 4
Returning to step 09, decoding processing of the remaining image data is performed.

When the decoding of all JBIG image information data is completed and the result of determination 416 is YES, a procedure for ending reception of image information for one page is executed (process 417). Then, it is checked whether or not the value of the line counter LC at that time is larger than the value of the variable LA (decision 418). If the result of the decision 418 is YES, of the image data stored in the page memory,
The image data corresponding to the number of (LC-LA) lines is deleted from the last line (process 419). Also, judgment 41
When the result of Step 8 is NO, the process 419 is not executed.

In this way, when the image data of the last stripe of the image data for one page is arranged in the page memory, the image data stored in the page memory is transferred to the plotter 5 and the remaining image is recorded. Output (process 420).

Next, it is checked whether the transmission of the next page has been notified from the partner terminal (decision 42).
1) When the result of the determination 421 is YES, the process returns to the process 408 to perform the image information receiving operation of the next page.

If the result of determination 421 is NO, the line is restored in accordance with a predetermined termination procedure (Step 4).
22), a series of image information receiving operation ends.

When the encoding method of the image information notified from the partner terminal is the normal method, the result of decision 405 is NO.
, A normal image information receiving process is executed (process 423).
Go to 2 and restore the line according to the predetermined termination procedure,
A series of image information receiving operation ends.

As described above, in this embodiment, by notifying the transmitting terminal that only the basic JBIG system is provided, the original image included in each stripe data body SDE of the binary image data BID is notified. Since the number of lines of image data is limited to 128 lines, the data capacity required for the page memory can be reduced, so that the apparatus cost can be reduced.

In the above-described embodiment, the case where the present invention is applied to a group 3 facsimile apparatus has been described. However, the present invention is applicable to other image transmission apparatuses such as a group 4 facsimile apparatus and these facsimile apparatuses. The present invention can be similarly applied to a data terminal device having a function of transmitting image information equivalent to the above.

[0065]

As described above, according to the present invention,
When the received JBIG image information indicates that the NEWLEN marker is used, the received JBIG image information is temporarily stored, a NEWLEN marker is searched for from the stored JBIG image information, and the stored JBIG image information is used.
Since the image data of the total number of lines specified by the NEWLEN marker is decoded and formed based on the IG image information, no unnecessary image data is formed. The effect is that it can be reproduced in a short time.

When the decoding process forms image data of a total number equal to or more than the total number of lines specified by the NEWLEN marker, the number of lines of the image data is changed to
Since the number of lines is limited to the specified total number, there is also obtained an effect that a document image read on the transmission side can be appropriately reproduced without forming useless image data.

Further, by notifying the transmitting terminal that only the basic JBIG system is provided, the number of lines of the original image data included in each stripe data body SDE of the binary image data BID is reduced to 128 lines. Since the data capacity required for the page memory can be reduced, the effect that the apparatus cost can be reduced can also be obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration example of a group 3 facsimile apparatus according to one embodiment of the present invention.

FIG. 2 is a flowchart illustrating an example of processing when an incoming call is detected according to an embodiment of the present invention.

FIG. 3 is a flowchart showing an example of JBIG image information decoding processing.

FIG. 4 is a flowchart showing a processing example when an incoming call is detected according to another embodiment of the present invention.

FIG. 5 is a flowchart showing a part of a processing example at the time of detecting an incoming call according to still another embodiment of the present invention.

FIG. 6 is a flowchart showing another part of the processing example when an incoming call is detected according to still another embodiment of the present invention.

FIG. 7 is a schematic diagram for explaining the structure of image information data in the JBIG system.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04N 1/41-1/419 H04N 1/32

Claims (3)

(57) [Claims] In a control method of a facsimile apparatus having a function of encoding and decoding image information in a JBIG encoding method, when JBIG image information is received, header information of the received JBIG image information is analyzed. And NEW in that JBIG image information
Check if the LEN marker is used and check for NEW
When the LEN marker is used, a NEWLEN marker is searched for from the received JBIG image information, the total number of lines of the image information indicated by the NEWLEN marker is recognized, and the received JBIG image information is decoded. A decoding process until the number of lines of the decoded image data matches the recognized total number of lines. 2. A method of controlling a facsimile apparatus having a function of encoding and decoding image information in a JBIG encoding method, comprising the steps of: when receiving JBIG image information, analyzing header information of the received JBIG image information; And NEW in that JBIG image information
Check if the LEN marker is used and check for NEW
When the LEN marker is used, when decoding the received JBIG image information, the found NEWL
A method for controlling a facsimile apparatus, comprising: recognizing the total number of lines of image information designated by an EN marker, and limiting the number of lines of decoded image data to the recognized total number of lines. 3. A control method for a facsimile apparatus having a function of encoding / decoding image information in a JBIG encoding method, wherein the transmitting side is provided with only the basic JBIG method when receiving image information. While receiving the JBIG image information, the header information of the received JBIG image information is analyzed, and the JBIG image information is used as the NEW.
Check if the LEN marker is used and check for NEW
When the LEN marker is used, when decoding the received JBIG image information, the found NEWL
A method for controlling a facsimile apparatus, comprising: recognizing the total number of lines of image information designated by an EN marker, and limiting the number of lines of decoded image data to the recognized total number of lines.