JPH05199423A - Method for discriminating storage system of picture data - Google Patents

Abstract

PURPOSE:To properly print out transmission picture data in a memory by detecting the position of an EOL signal for a picture element signal to discriminate the document size while successively converting picture data, which is subjected to encoding processing and is stored in a picture memory, to the picture element signal in the MH decoding mode. CONSTITUTION:Picture data of a document G read and scanned by a picture read part 2 is inputted to a picture memory 1 of a facsimile equipment F and is encoded by an encoding circuit 3. For the purpose of discriminating the picture data storage system, a signal processing part 4 is used to read out encoded picture data, and this data is inputted to a decoding circuit 5 and is converted into the picture element signal in the MH decoding mode, and the picture element signal of prescribed bits as information of black-and-white picture elements is allowed to follow the EOL signal indicating the head of a picture data signal in the case of a first line, and the EOL signal indicating the end of the first line of the picture element signal follows it. Thus, the document width, the line density, or the like is detected without a management table to properly discriminate the storage system.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for discriminating a storage system of image data stored in an image memory.

[0002]

2. Description of the Related Art Recently, in facsimile machines, after image data of an original scanned and scanned is temporarily stored in an image memory in a state of being compressed and converted by a predetermined encoding method such as MH or MR, after a predetermined time elapses. A device having a so-called memory transmission function for executing facsimile transmission by making an automatic call or the like has been developed and used. On the other hand, when performing such memory transmission, prior to the transmission of the image data, the facsimile apparatus of the other party is requested to transmit its own image data encoding method, the document width, and the linear density of the image data (at the time of document reading scanning). It is necessary to transmit data such as normal, fine, and S-fine modes) as protocol signals.

Therefore, conventionally, as shown in FIG. 5, when the image data of the original G read and scanned by the image reading unit 2 is accumulated in the image memory 1 via the signal processing unit 4, it is provided separately from this. The management table 10 thus stored stores the data of the storage system such as the encoding system of the image data, the document width, and the linear density. According to the use of the management table 10, the data stored in the management table 10 is read out and transmitted and output prior to the facsimile transmission of the image data, so that the content of the storage method of the image data to be transmitted thereafter is transmitted. You can

[0004]

However, in the above-mentioned conventional method, since the dedicated management table 10 for storing the data of the image data storage method is required, not only the hardware configuration becomes complicated, but also this is required. Management table 1
If the memory of 0 is broken for some reason, the method of accumulating image data cannot be known anymore. Further, conventionally, since the data of the storage method must be stored in the management table 10 for each file of the image data to be stored in the image memory 1, when the number of image data files is large, the memory of the management table 10 is used. There is also a fear that the area becomes large and the memory usage efficiency deteriorates. Conventionally, such various problems are not limited to the case of performing the above-mentioned memory transmission, but in the case of performing a memory reception, that is, after the image data received from the facsimile machine on the other end is temporarily stored in the image memory,
This also occurs in the case of determining the storage method when the image data is read out and printed out on the recording paper.

The present invention has been proposed in view of the above points, and is an encoding method for image data stored in an image memory,
An object of the present invention is to provide an image data storage method determination method capable of appropriately determining contents such as document width and line density without using a management table.

[0006]

SUMMARY OF THE INVENTION An image data storage method determination method according to the present invention, which has been proposed to achieve the above object, is a method of encoding image data stored in an image memory into an MH decoding mode. While sequentially converting the pixel signals into pixel signals, the position of the EOL signal with respect to the pixel signals is detected to determine the document size, and then the MH of the image data of the subsequent line
By identifying whether the decoding is in error,
This is a configuration for discriminating the encoded storage format.

[0007]

In the method of discriminating the image data storage system according to the present invention having the above-mentioned structure, an EOL signal for position detection when the image data stored in the image memory is decoded into a pixel signal in the MH decoding mode. Indicates the end of the pixel signal for each line of the read and scanned image data, and its position differs depending on the document size. For example, when the document width is A4 width, after the 1728-bit pixel signal. The EOL signal is added, and in the case of the B4 width, the EOL signal is added after the 2048-bit pixel signal. Therefore, according to the present invention which detects the EOL signal and determines the position with respect to the pixel signal, the document width of the image data can be accurately determined.

Further, in the present invention, if the image data of the second and subsequent lines can be MH-decoded without an error, the line is in the MH system, and if an error occurs and the MH-decoding cannot be performed, the line is in the MR system. to decide. Therefore, in the present invention, the signal of the image data of the second and subsequent lines is M depending on whether or not the MH decoding causes an error.
It is possible to sequentially determine whether it is H or MR. For example, if only MH continues, the one-dimensional coding method (MH method) is used. If MR lines are present, the two-dimensional coding method (MR method) is used. ), The image data encoding method can be accurately determined.

Further, as described above, when the MH and MR systems for each line of the pixel signal are sequentially identified, it is determined whether the linear density in the MR system is the normal, fine or S-fine mode. be able to. That is, in the two-dimensional encoding method, the pitch of the MH-converted lines of the pixel signal is different for each of the normal mode, the fine mode, and the S-fine mode. It is possible to determine the line density by identifying whether or not they exist at regular intervals. For example, if the third line of the pixel signal is MH, it is normal,
If the fifth line is MH, it can be determined as fine, and if the ninth line is MH, it can be determined as S-fine.
Therefore, according to the present invention, the original size, the encoding method, and the linear density of the image data stored in the image memory can be determined without storing the image data storage method in the management table or the like.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an example of a hardware configuration of a facsimile apparatus F to which the image data storage method determination method according to the present invention is applied, FIG. 2 is an explanatory diagram showing signals of image data subjected to decoding processing, and FIG. It is explanatory drawing which shows the encoding state of each line corresponding to scanning line density.

The image memory 1 of the facsimile apparatus F shown in FIG.
First, in the case where the image data of the document G read and scanned by the image reading unit 2 is accumulated in the state of being encoded by the encoding circuit 3, first, to determine the accumulation method of the image data, first, Image memory 1 by signal processing unit 4
The coded image data is read from and is input to the decoding circuit 5 to be converted into a pixel signal in the MH decoding mode. As shown in FIG. 2, the signal of the decoded image data is as shown in FIG.
The EOL signal indicating the leading edge of the image data signal is followed by a pixel signal having a predetermined number of bits as information of black and white pixels, and thereafter, the EOL signal indicating the end of the first line of the pixel signal follows. The EOL signal to be detected in the present invention is not the most advanced EOL signal but the EOL signal on the terminating side, and when simply referred to as the EOL signal in the present invention, it means the EOL signal on the terminating side. Further, the second and subsequent lines of the decoded image data signal are different from the first line in that there is no EOL signal on the start end side, but other than that, similar to the first line,
It is a signal composed of pixel signals and EOL signals.

However, when decoding the above image data,
Since it is necessary to specify the document width in advance, in this embodiment, for example, the A4 width is specified as the first document width. When the image data is decoded in the A4 width, the signal processing unit 4 counts the number of bits of the pixel signal until the EOL signal of the image data signal of the first line is detected, and the original document It is possible to determine whether or not the width is A4 width. That is, the number of black and white pixels of the A4 width image data is 1
Since it is 728 dots, if the EOL signal is detected immediately after the 1728-bit pixel signal, the image data is A
It can be judged to be 4 widths. On the other hand, when the pixel signal until the EOL signal is detected is not 1728 bits (in the case of an error), it can be determined that the document width of the image data is not the A4 width. Alternatively, the A3 width is newly designated and the decoding process of the image data is executed again, and the decoding process is repeated while changing the designated document width until the document width can be determined without any error.

Since the number of black and white pixels on one line of B4 width and A3 width is 2048 dots and 2432 dots, respectively,
When decoding is performed with the B4 width specified, if the EOL signal is detected after the 2048-bit pixel signal, B4
It can be judged that the width is wide, and if it is decoded in A3 width, it is 24
If the EOL signal is detected after the 32-bit pixel signal, it can be determined that the width is A3. The document width of such image data can be appropriately determined only by looking at the first line of the signal of the decoded image data.

Next, M of the image data of the first line
Following the H decoding process, the MH decoding process of the second line is performed. At that time, if the MH decoding of the image data of each line can be executed without error, naturally that line is MH, but an error occurs. If so, it is determined that the encoding method of the image data of that line is MR. Therefore, in the present invention, the signal processing unit 4 refers to the error occurrence state due to the decoding process, and if the second line is MH, the encoding method of the image data is the one-dimensional encoding method (MH method). And it is different from this, and the second line is M
If it is R, it is determined to be the two-dimensional encoding method (MR method). Since all lines in the one-dimensional encoding method are MH methods, it is only necessary to identify the encoding method of the second line.
It is possible to determine whether the image data encoding method is the one-dimensional encoding method or the two-dimensional encoding method.

Further, when the image data is discriminated by the two-dimensional encoding method as described above, the image data of the subsequent lines is also MH-decoded and the MH of each line is determined depending on whether or not an error occurs. , MR, the linear density can also be identified. That is, as shown in FIG. 3, when the read scanning line density of the original image is one of the normal, fine, and S-fine modes, these modes are common in that the first line is MH. However, the positions where the MH line exists are different in the subsequent lines. Therefore, in the present invention, the encoding method of each line from the second line onward is referred to, and if the next MH line is on the third line, it is in the normal mode, if it is on the fifth line, it is on the fine mode, and on the ninth line. If there is, it can be judged as the S-fine mode.

From step 100 of the flowchart of FIG.
Reference numeral 113 denotes a procedure of the above-described series of image data storage method determination methods.
The determination can be made by the decoding processing of the first line based on the document width assumption of 01, 109, and 110, and after the document width is determined, the MH is also used for the second and subsequent lines, as shown in part B of steps 102 to 108. The linear density and the compression coding method can be determined by sequentially performing the decoding process and checking the occurrence of the error. In the figure, step 11
The Ba and Bb sites of Nos. 1 and 113 are described in steps 102 to 1.
The procedure is similar to that of the part B of No. 08, and its illustration is omitted for convenience.

As described above, if the storage method of the image data stored in the image memory 1 is determined, the mutual transmission of the protocol signal (during the handshake) with the facsimile apparatus on the other side when executing the memory transmission. In the above, since the image data storage method of the facsimile apparatus F can be appropriately transmitted, the image data can be transmitted thereafter without any trouble. Further, even when the facsimile device F receives the image data from the facsimile device of the other party in the memory, that is, even when the received image data is once stored in the image memory 1, the storage method can be appropriately determined. Image data can be printed out appropriately.

The encoding system for accumulating the image data read and scanned by the image reading unit 2 in the image memory 1 may be preset to either MH or MR depending on the specifications of the facsimile apparatus. In that case, it is not necessary to determine the encoding method, but it is still necessary to determine the document width and the line density by the method according to the present invention. In addition, the image data transmitted from the other party at the time of receiving the memory is directly encoded in the image memory 1 by the same encoding method.
In the case where the image data received by the memory and the image data obtained by reading and scanning the original are mixed and stored in one image memory 1,
In such a case, it is necessary to determine the coding method by the method according to the present invention because the coding method is not known. Incidentally, in the present invention, it is of course possible to apply the K parameter as a concept different from the MH system and the MR system as the type of the encoding system.

[0019]

As can be understood from the above description, according to the image data storage method determination method of the present invention, the encoding method of the image data stored in the image memory, the document width,
Also, since the line density and the like can be appropriately determined without using the management table, the hardware configuration of the facsimile apparatus can be simplified as compared with the conventional one by omitting or removing the management table. Since the memory area for storing the data storage method can be eliminated,
Even if the memory used in the management table can be efficiently used and the memory in the management table is destroyed, the storage method of the image data can be appropriately determined, and the memory transmission or the image data transfer to the recording paper can be performed. The special effect that the print output can be executed properly is obtained.

[Brief description of drawings]

FIG. 1 is a block diagram showing an example of a hardware configuration of a facsimile device to which an image data storage method determination method according to the present invention is applied.

FIG. 2 is an explanatory diagram showing an example of a signal of image data that has been subjected to decoding processing.

FIG. 3 is an explanatory diagram showing a relationship between a read scanning line density and an encoding system of each line of an image data signal.

FIG. 4 is a flowchart showing a procedure of an image data storage method determination method according to the present invention.

FIG. 5 is a block diagram showing a hardware configuration of a facsimile apparatus applied to execute a conventional image data storage method.

[Explanation of symbols]

 1 Image Memory 2 Image Reading Unit 3 Encoding Circuit 4 Signal Processing Unit 5 Decoding Circuit F Facsimile Device G Original

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] March 3, 1992

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 3

[Correction method] Change

[Correction content]

[Figure 3]

Claims (1)

[Claims] 1. The image data stored in an image memory after being coded is sequentially converted into pixel signals in an MH decoding mode, the position of an EOL signal with respect to the pixel signals is detected to determine the document size, and then the original size is determined. A method for determining a storage method of image data, characterized by determining whether or not an MH decoding of image data of a subsequent line causes an error to determine a coded storage format.