JPH08163369A - Facsimile equipment - Google Patents

Abstract

PURPOSE: To shorten the time required for decoding or picture data encoded to the JBIG code. CONSTITUTION: At the time or reception at code data in the JBIG encoding system, data is written in a buffer memory 11 and is written in a buffer memory 12; and when data is written up to the position of the 8th byte in the buffer memory 12, data in the buffer memory no is encoded. When the mast of data appears thereafter, information in a determined position from the last is taken as information of the subscanning length, and the decoding processing is executed based on this information.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facsimile machine for communicating image data using the JBIG encoding system.

[0002]

2. Description of the Related Art JBIG (Joint bi-level Image Group)
Encoding system recommended by ITU-T (T.82)
Since it is also effective for transmitting and receiving images by facsimile, some manufacturers are promoting the development of circuits for encoding and decoding images according to this encoding method, and facsimile machines equipped with such circuits. There is.

The data structure according to the JBIG encoding system is composed of BIH which is a parameter portion for each page and BID which includes image data PSCD. When transmitting by facsimile using the above encoding method, BI
In front of H or PSCD in BID, NEWLE
The sub-scan length of the page must be entered with the N marker code. Here, when focusing on the direct transmission function of the facsimile, the transmission side cannot know the sub-scan length until the reading of the image is completed. That is, PSC
It is impossible to carry sub-scan length information before D.

Therefore, the NEWLEN marker code is PS
The recommendation was changed so that the sub-scan length can be transmitted after the image data by placing the CD after the CD.

However, some existing circuits for encoding and decoding according to the JBIG encoding method do not support the above-mentioned changes, and therefore NEWLEN is added after PSCD.
If you receive data with marker code,
Decoding cannot be normally performed by the above-described conventional processing only by the circuit.

Further, in the conventional facsimile apparatus, if there is information to be extracted in the received data and it is unknown about the position where this information appears in the received data, the received data will be treated first. I'm investigating all this until the appearance of this information.

[0007]

However, in the above-mentioned conventional method, NEWWLE is used by the JBIG encoding method.
When reception is performed when the N marker code is added after PSCD, the required sub-scan length information is included in the trailing end portion of the received data, and the sub-scan length is the trailing end of the received data. Since it is decided to be placed in a fixed position from the above, there is a problem that checking all the received data from the beginning consumes processing time unnecessarily.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a facsimile apparatus capable of quickly extracting sub-scan length information and reducing the time required for decoding. Is to provide.

[0009]

[Means for Solving the Problems] and

In order to achieve the above object, the present invention provides a JBI.
In a facsimile device that transmits and receives G-encoded image data, a plurality of storage means for accumulating received image data, a detection means for detecting the writing amount of the image data in the storage means, and the writing amount being a predetermined amount. When it reaches, the information processing apparatus further comprises means for taking out information at a predetermined position of the image data, and decoding means for decoding the JBIG-coded image data by using the information as information about a sub-scanning length.

In the above configuration, it functions to shorten the time required for JBIG decoding.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a block diagram showing the configuration of a facsimile apparatus according to an embodiment of the present invention. In the figure,
Reference numeral 1 is a control unit that controls the entire apparatus by, for example, a CPU (central control unit), 2 is a scanner for reading an image, 3 is a scanner control unit that controls the scanner 2, and 4 is a scanner control unit. Printers that print and output images, 5
Is a printer control unit that controls the printer 4.

Reference numeral 6 is a JBIG circuit for encoding and decoding an image according to the JBIG encoding method, 7
Is an operating unit operated by an operator, 8 is a display unit for displaying various information, 9 is a program memory for storing a predetermined program, 10 is a data memory for storing data such as control data, Buffer memories 1, 2 and 13 for temporarily storing the received data before passing the received data to the data memory 10 accommodate a line 15 and a communication control unit for controlling communication in the present device, and
Reference numeral 14 is a bus that electrically connects the above-described components to each other.

Next, the operation of the facsimile apparatus according to this embodiment having the above configuration will be described.

2, 3 and 4 are flow charts showing a data processing control procedure (sequence) in the facsimile apparatus according to the present embodiment.

First, in FIG. 2, when an incoming call is received by the facsimile apparatus (step S201), a receiving process is performed (step S202). Then, it is checked whether or not the received data is coded data according to the JBIG coding method (step S203).

If it is determined in the above step S203 that the received data is not JBIG data, a conventionally known output process is performed (step S204). But,
If the received data is JBIG data, NEWLE in the BIH of the received data or before PSCD
It is checked whether or not the sub-scan length is indicated by the N marker code (step S205). Then, if the sub-scan length exists at the above position, JBI can be performed by normal data transfer.
The data is passed to the G circuit 6 (step S206), a decoding process is performed (step S207), and the data is output (step S208).

On the other hand, in the BIH of the received data, or P
If the NEWLEN marker code has no sub-scan length before SCD, the following processing is performed.

That is, like the normal data transfer, the image data is written in the buffer memory 1 (11) (step S301 in FIG. 3), and the end of the data is determined in the following step S302. And this buffer is full (FU
LL) (Yes in the determination in step S303)
s), the image data is written in the buffer memory 2 (12) (step S304).

In this way, when the data is written in the buffer memory 2 (12) and it is determined in step S305 that the data is not yet completed, the data is written in 8 bytes (Yes in step S306). J that decrypts the data of 1 (11) with JBIG
It is passed to the BIG circuit 6 (step S307). Then, in step S309, the buffer memory 2 (12) is set to the buffer memory 1 (11), the process is returned to step S301, and the series of writing processes described above is repeated.

In the above processing, the buffer memory 1
(11) and while writing data to the buffer memory 2 (12), when one page of data is completed (step S
302, Yes in S305), the rear end 8 bytes of the data written in these buffer memories are taken out (step S401 in FIG. 4). Then, the sub-scanning length indicated by the NEWLEN marker code is extracted from the extracted data, and it is used as the end code (SDNORM / SDRS
(T) + sub-scan length (step S40
2) Then, the converted data is newly added to the data rear end of the buffer memory (step S403).

Thereafter, the decoding process (step S404) and the output process (step S405) are performed as in the normal process.
Perform

FIG. 5 briefly shows the flow of processing of the above-mentioned image data. Referring to FIG. 5, the communication control unit 13
Image data received via the buffer memory 1 (1
1) and the buffer memory 2 (12) are written, and at the time when 8 bytes of data are written in the buffer memory 2 (12), the data in the buffer memory 1 (11) is JBI.
You can see how it is passed to the G circuit 6.

As described above, according to this embodiment,
When the coded data according to the JBIG encoding method is received,
Data is written in the buffer memory 1, data is further written in the buffer memory 2, and
Of the buffer memory 1 is encoded at the time when the data is written to a predetermined position, and then, at the time when the last end of the data appears, the information at the predetermined position is extracted from the last end. Thus, the information of the sub-scan length can be taken out without checking all the received data from the beginning, and the time required for decoding can be reduced.

In the above embodiment, the write data amount to the buffer memory 2 is 8 bytes.
It is not limited to bytes. That is, when the information to be extracted is 8 bytes, at least 8 bytes must be written. However, extra data may be added on the transmitting side. Therefore, even if the information has more than 8 bytes, it is the same as the above embodiment. The effect of can be obtained.

In the above embodiment, the case where the NEWLEN marker code is added after the PSCD in the JBIG encoding method has been described, but the invention is not limited to the detection of the NEWLEN marker code. For example, it is also applicable when the sub-scan length is specified by a new marker code, and also when the sub-scan length is fixed at 2 bytes.

The present invention may be applied to a system composed of a plurality of devices or an apparatus composed of a single device. Further, it goes without saying that the present invention can be applied to the case where it is achieved by supplying a program to a system or an apparatus.

[0028]

As described above, according to the present invention,
By performing the decoding process of the received image data based on the information located at the predetermined position from the end portion of the received image data, the processing speed required for the decoding can be increased.

[0029]

[Brief description of drawings]

FIG. 1 is a block diagram showing an overall configuration of a facsimile apparatus according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a data control processing procedure in the facsimile apparatus according to the embodiment.

FIG. 3 is a flowchart showing a data control processing procedure in the facsimile apparatus according to the embodiment.

FIG. 4 is a flowchart showing a data control processing procedure in the facsimile apparatus according to the embodiment.

FIG. 5 is a diagram showing a flow of image data in the apparatus according to the embodiment.

[Explanation of symbols]

 1 Control Section 2 Scanner 3 Scanner Control Section 4 Printer 5 Printer Control Section 6 JBIG Circuit 7 Operation Section 8 Display Section 9 Program Memory 10 Data Memory 11 Buffer Memory 1 12 Buffer Memory 2 13 Communication Control Section 14 Bus 15 Lines

Claims (5)

[Claims] 1. A facsimile apparatus for transmitting and receiving JBIG-encoded image data, a plurality of storage means for accumulating received image data, a detection means for detecting a writing amount of the image data in the storage means, When the writing amount reaches a predetermined amount, a unit for extracting information at a predetermined position of the image data, and a decoding unit for decoding the JBIG-coded image data by using the information as information about a sub-scanning length are provided. A facsimile device characterized by the above. 2. The facsimile apparatus according to claim 1, wherein the information is information at a predetermined position from the end of the predetermined amount of image data. 3. The apparatus further comprises means for converting the information into a format that can be processed by the decoding means, and means for adding the converted information to the rear end of the predetermined amount of image data. The facsimile apparatus according to claim 1. 4. The facsimile apparatus according to claim 1, wherein the information is fixed length information. 5. The facsimile apparatus according to claim 1, wherein the information is variable length information.