JP4060291B2 - Memory management device and control program thereof - Google Patents

Description

  The present invention relates to a memory management device that temporarily compresses and stores bitmap data of an image before outputting the image data to an engine unit, and a control program thereof. More specifically, compressed data obtained by compressing bitmap data includes: The present invention relates to a memory management device that does not affect other memory areas even when it does not fit in a compressed data memory area, and a control program therefor.

Conventionally, in black and white and multi-value image forming apparatuses, in order to reduce the memory usage, after compressing the bitmap data of an image divided into a plurality of bands, the compressed data is compressed by hardware compression. And stored in the compressed data memory area by DMA transfer. When executing the printing process, output image data is obtained by decoding the compressed data.
However, in such a conventional image forming apparatus, if the compressed data does not fit in the compressed data memory area, the data overflowing from the compressed data memory area may become an input buffer area for storing received data or a system work area. There is a problem in that data is written in other areas and data originally written in these other areas is destroyed.

Therefore, in a conventional image forming apparatus, an area having a size converted by the maximum compression rate of the compressor of the image forming apparatus (a compression rate that maximizes the size of the compressed data) is stored in the compressed data memory area. There is also proposed an apparatus that performs compression processing after performing data thinning processing or the like so that the data to be transferred is surely stored in the compressed data memory area when an area of this size cannot be secured (for example, (See Patent Document 1).
According to such a conventional image forming apparatus, data thinning-out processing and other compression processing for reducing image quality are performed so that the data transferred by DMA can be surely contained in the compressed data memory region. Breaking the area can be avoided.
JP 2000-165633 A

However, according to the above-described conventional technique, if an area having a size converted with the maximum compression rate cannot be secured in the compressed data memory area, the data thinning process or other compression process that reduces the image quality is performed. There has been a problem that a separate hardware configuration is required for processing.
In addition, if data thinning processing is performed, there is a problem in that an output image causes unnecessary image quality deterioration and a good performance cannot be obtained.

  The present invention has been made in order to solve the above-described problems. For recovering the memory state even if an area other than the compressed data memory area is destroyed, the data thinning process and other image quality are reduced. An object of the present invention is to provide a memory management device and a control program for the memory management device that can obtain a good output image without requiring a special hardware configuration.

  In order to achieve the above object, a memory management device of the present invention is a memory management device including a storage unit having a plurality of memory areas including a data storage area for storing main data, and for each memory area, A block generating unit that generates a control block that holds management information for managing the memory area and that duplicates the control block, and a memory area corresponding to the generated control block And a memory placement means for placing the replication control block at a predetermined location other than the memory area corresponding to the control block before duplication of the replication control block, and detecting destruction of the control block Block destruction detection means and a replication control block corresponding to the control block in which the destruction is detected are extracted from a predetermined location and controlled. A configuration equipped with a data writing means for writing the head of the memory area block has been placed.

If the memory management device has such a configuration, the memory arrangement unit arranges each control block generated by the block generation unit at the head of the data storage area managed by the control block, and controls the replication control block. The memory area corresponding to the block is arranged at a predetermined location other than the top portion. That is, since the control block is arranged at the boundary between the memory areas, it also serves as boundary part recognition data for recognizing the data boundary in the memory as well as managing the data in the data storage area.
The block destruction detection means determines whether or not each control block has been destroyed when the compressed data is stored in the compressed data storage area, and detects data if the destruction has occurred. Can extract a replication control block corresponding to a control block in which destruction has been detected from a predetermined location and write it to the beginning of the memory area in which the destroyed control block is located.
For this reason, conventionally, when the compressed data does not fit in the compressed data storage area, the data structure in the other memory area is destroyed by using the hardware configuration for performing the thinning process of the image data or the compression process for reducing the other image quality. However, according to the present invention, since the control block is restored by writing the replication control block even if such a configuration is not required, data destruction in other memory areas can be prevented as in the conventional case. . Furthermore, since conventional processing such as data thinning is not performed, an excellent output image can be obtained without causing unnecessary image quality degradation.

The memory management device of the present invention is the memory management device according to claim 1, wherein the one or more data storage areas store compressed data obtained by compressing image data as main data, The memory management device includes original image data storage means for storing the original image data before compression of the compressed data. When the block destruction detection means detects destruction of the control block, the data writing means performs compression related to the destruction. The data is erased from the data storage area, the original image data is taken out from the original image data storage means, and written into the data storage area.
If the memory management device has such a configuration, since the original image data storage means stores the original image data before compression, the data writing means erases the compressed data related to the destruction from the data storage area, Original image data can be stored.
For this reason, when the compressed data obtained by the compression process becomes larger than the original image data before the compression, the original image data can be stored in the data storage area, so that the memory usage can be suppressed. In addition, destruction of other memory areas can be prevented.
When original image data is stored in the data storage area in this way, output image data is directly generated from the original image data without performing decompression processing.

The memory management device according to the present invention is the memory management device according to claim 1 or 2, wherein the one or more data storage areas store data relating to the application as main data, and the memory management device. Includes a replicated data storage means for storing replicated data obtained by replicating data related to the application. When the destruction of the control block is detected by the block destruction detection means, the data writing means is managed by the destroyed control block. The data related to the application stored in the stored data storage area is erased, the replicated data is taken out from the replicated data storage means and written to the data storage area.
If the memory management device is configured as described above, the replicated data storage means stores the replicated data obtained by replicating the data related to the application. Therefore, the data write means stores the data stored managed by the destroyed control block. Data relating to the application stored in the area can be erased and duplicate data can be stored.
For this reason, even if the compressed data stored in the data storage area does not fit in the data storage area and destroys not only the control block but also the data storage area where the application is stored, Since it is held, the destroyed application data can be restored. For example, even if the destroyed data is an application used for image processing, the image processing can be normally performed.

According to a second aspect of the present invention, there is provided the memory management device according to claim 2, wherein the memory arrangement means is a memory located next to a memory area including a data storage area in which compressed data is stored. Only for the control block that manages the area, the replication control block is arranged at a predetermined location other than the top of the memory area managed by the control block.
If the memory management device has such a configuration, the replication control block arranged at a predetermined location by the memory arrangement unit controls the memory area located next to the memory area including the data storage area where the compressed data is stored. Since this is only for blocks, the amount of data held at a predetermined location can be minimized.
Note that the data destruction is caused by the compressed data that protrudes from the data storage area storing the compressed data. Therefore, the destruction of the memory area located next to the data storage area is almost all the case. Therefore, it is possible to sufficiently cope with the destruction by the compressed data without arranging the replication control blocks for all the control blocks at the predetermined locations as described above.

The memory management device according to the present invention is the memory management device according to claim 4, wherein the one or more data storage areas store data relating to the application as main data. , Provided with replicated data storage means for storing replicated data obtained by duplicating data relating to the application, and when the destruction of the control block is detected by the block destruction detection means, the data writing means is managed by the destroyed control block Data related to the application stored in the data storage area is erased, the replicated data is taken out from the replicated data storage means, and written to the data storage area.

The control program for a memory management device according to the present invention is a control program for a memory management device including a storage unit having a plurality of memory areas including a data storage area for storing main data, and for each memory area. A block generating step for generating a control block in which management information for managing the memory area is stored, a replica control block that duplicates the control block, and a memory corresponding to the generated control block Place the replication control block at the beginning of the area, place the replication control block at a predetermined location other than the top of the memory area corresponding to the control block before replication of this replication control block, and detect destruction of the control block Block destruction detection step to be performed, and a replication control block corresponding to the control block in which the destruction is detected. It was extracted from the predetermined location, certain data writing step of writing to the head portion of the data storage area control block has been arranged as a control program to be executed by the memory management unit.
If the control program of the memory management device is such a program, for example, by directly mounting the recording medium storing the control program on the memory management device on which the computer is mounted and reading the computer, the memory allocation step Each control block generated in the block generation step is arranged at the top of the data storage area managed by the control block, and the replication control block is arranged at a predetermined location other than the top of the memory area corresponding to the control block. .
Further, in the block destruction detection step, when the compressed data is stored in the compressed data storage area, it is determined whether or not each control block has been destroyed. If the destruction has occurred, the data writing step In this case, a duplicate control block corresponding to a control block in which destruction is detected can be extracted from a predetermined location and written to the head portion of the memory area where the destroyed control block is arranged.
For this reason, according to the present invention, it is possible to prevent data destruction in other memory areas as in the prior art by restoring the control block without requiring a special hardware configuration as in the prior art. Furthermore, since conventional processing such as data thinning is not performed, a satisfactory output image can be obtained without causing unnecessary image quality degradation.

A memory management device control program according to the present invention is the memory management device control program according to claim 6, wherein one or more data storage areas store compressed data obtained by compressing image data. A step of storing as main data, an original image data storing step in which the memory management device stores the original image data before compression of the compressed data, and a data writing step when the destruction of the control block is detected in the block destruction detecting step The control program causes the memory management device to execute the steps of erasing the compressed data related to destruction from the data storage area, extracting the original image data from the original image data storage means, and writing the original image data in the data storage area.

The memory management device control program of the present invention is the memory management device control program according to claim 6 or 7, wherein one or two or more data storage areas have application-related data as main data. And when the memory management device detects the destruction of the control block in the duplicate data storage step and the block destruction detection step in which the data related to the application is duplicated, the data write step is destroyed. A control program for causing the memory management device to execute the step of erasing the data relating to the application stored in the data storage area managed by the control block, taking out the duplicate data stored in the duplicate data storage step, and writing it in the data storage area It is as.

A memory management device control program according to the present invention is the memory management device control program according to claim 7, wherein the memory management step includes a data storage area in which compressed data is stored in the memory allocation step. Only for the control block that manages the memory area located next to the control area, the memory management apparatus executes a step of arranging the replication control block at a predetermined location other than the top of the memory area managed by the control block.

The memory management device control program according to the present invention is the memory management device control program according to claim 9, wherein one or more data storage areas store application-related data as main data. And when the memory management device detects the destruction of the control block in the duplicate data storage step in which the duplicate data obtained by duplicating the data relating to the application is stored, and in the block destruction detection step, the destroyed control in the data writing step. As a control program for causing the memory management device to execute the step of erasing data relating to the application stored in the data storage area managed by the block, taking out the duplicate data stored in the duplicate data storage step, and writing it in the data storage area is there.

  According to the present invention, the generated control block is arranged at the head of each memory area, the replication control block of each control block is arranged at a predetermined position, and the control block corresponding to the destruction detected is corresponded Since the data writing means for writing the duplication control block is provided, the control block can be restored and the destruction of the data can be prevented without requiring a hardware configuration for performing a thinning-out process or the like of the image data. Furthermore, since processing such as data thinning is not performed, a satisfactory output image can be obtained without causing unnecessary image quality degradation.

Embodiments of the present invention will be described below with reference to the drawings.
An embodiment according to a memory management device of the present invention will be described with reference to FIG.
FIG. 1 is an overall configuration diagram of an image forming apparatus having a memory management apparatus according to the present invention.
However, although the image forming apparatus shown in FIG. 1 shows the configuration of a copying machine as a specific example, the image forming apparatus of the present embodiment is not limited to a copying machine. For example, a printer, a facsimile, a scanner, a digital composite apparatus (Multifunction peripheral (MFP)) and the like.

  Further, when the image forming apparatus of the present embodiment is a printer, the printer includes various printing methods such as an inkjet printer, a sublimation type thermal transfer printer, a dot impact printer, a laser printer, and a fusion type thermal transfer printer. Includes a printer.

As shown in FIG. 1, the image forming apparatus 100 includes a control unit 10 and a data storage unit 20. In the present embodiment, a device having at least the control means 10 and the data storage means 20 is referred to as a “memory management device”.
The image forming apparatus 100 compresses image data input from the outside, and temporarily stores the compressed data (main data) in a predetermined compressed data storage area (data storage area). Then, the compressed data is expanded in response to the print processing request, and output image data is obtained based on the expanded data.

  The control unit 10 includes a CPU, a memory, and the like, and is a device that performs overall control of the image forming apparatus 100. The block generation unit (block generation unit) 11, a memory arrangement unit (memory arrangement unit) 12, and a memory (storage) Means) 13, a block destruction detection unit (block destruction detection unit) 14, a data writing unit (data writing unit) 15, and an image processing unit 16.

The block generation unit 11 generates, for each memory area in the memory 13, a control block that holds management information for managing the memory area, and generates a duplicate control block that duplicates the control block. .
Here, the control block refers to a memory control block (MCB), and is a block that holds information regarding the arrangement in the memory 13. The control block is secured separately from the memory area used by the application.
The memory arrangement unit 12 arranges the control block generated by the block generation unit 11 at the head of the corresponding memory area, and the duplication control block corresponds to the control block before duplication of the duplication control block. It is arranged at a predetermined location other than the top of the memory area. For example, the memory placement unit 12 places a replication control block at the head of a compressed data storage area (data storage area) that stores compressed data. The head of the compressed data storage area is a portion that is not destroyed even if the compressed data is larger than the memory capacity of the compressed data storage area.
In the following description, it is assumed that the copy control block is arranged at the head of the compressed data storage area storing the compressed data.

The memory 13 includes at least a compressed data storage area that stores compressed data (main data) obtained by compressing image data. In addition, an empty area that does not store data and an application (main data) used for image processing are stored. A storage device including a plurality of memory areas such as a use area.
The block destruction detection unit 14 is arranged at the beginning of a plurality of memory areas when compressed data obtained by compressing image data by a compression processing unit (not shown) is stored in the compressed data storage area. It is detected whether or not the control block is broken. In other words, the block destruction detection means 14 determines whether or not the compressed data obtained by compressing the image data is within the compressed data storage area.

FIG. 2 is a schematic diagram showing an example of area arrangement in the memory in the image forming apparatus having the memory management apparatus according to the present embodiment.
In FIG. 2, control blocks (MCB # 1 and MCB # 2) are arranged at the heads of the memory areas (area # 1 and area # 2), respectively. Further, a duplicate control block (MCB # 2 ′) obtained by duplicating the control block MCB # 2 is arranged immediately before the area # 1.
Further, the data storage means 20 such as an HDD separate from the memory 13 included in the control means 10 to be described later is provided with an original image data storage unit 21, and the compressed data stored in the compressed data storage area (area # 1). The image data before being compressed is stored.
By arranging the duplication control block (MCB # 2 ′) at a predetermined location other than immediately after the compressed data storage area (area # 1) in this way, the compressed data should be stored in the compressed data storage area (area # 1). In addition, the copy control block (MCB # 2 ′) is not destroyed even if it protrudes from the area.

FIG. 3 is a schematic diagram showing an area destruction state in the memory in the image forming apparatus having the memory management apparatus according to the present embodiment.
In FIG. 3, the solid black portion immediately before the free area (MCB # 2) was originally a part of the control block (MCB # 2) and the free area (area # 2) as shown in FIG. That is, in this solid black portion, the compressed data does not fit in the compression data storage area (area # 1), and a part of the control block (MCB # 2) and the empty area (area # 2) are destroyed. Is shown.
That is, in the example shown in FIG. 3, the block destruction detection unit 14 detects whether or not destruction has occurred in the control block (MCB # 2) arranged at the head of the free area (area # 2). Yes.

The data writing unit 15 extracts the duplication control block corresponding to the control block in which the destruction is detected from the head part of the compressed data storage area, and writes it to the head part of the memory area where the control block is arranged.
Further, when the block destruction detection unit 14 detects the destruction of the control block, the data writing unit 15 erases the compressed data related to this destruction from the compressed data storage area, and the original image data storage unit 21 (to be described later) deletes the original image. Data is extracted and written to the compressed data storage area. The original image data refers to image data before the compressed data is compressed.
Further, when the block destruction detection unit 14 detects the destruction of the control block, the data writing unit 15 erases the data related to the application stored in the data storage area managed by the destroyed control block. The duplicate data is extracted from the duplicate data storage unit 22 to be written and written in the data storage area.
In addition, the data writing unit 15 stores image data (original image data) before compression processing, which is taken into the image forming apparatus 100 from the outside, and copy data of an application executed by the control unit 10, which will be described later. Is writing.

FIG. 4 is a schematic diagram showing a restoration state of a destroyed area in the memory in the image forming apparatus having the memory management apparatus according to the present embodiment, and shows the free area (area # 2) shown in FIG. The restoration state from the destruction state is shown.
In the example illustrated in FIG. 4, the data writing unit 15 once erases the control block (MCB # 2) in which the destruction is detected by the block destruction detection unit 14, and the replication control block (MCB # 2 ′) is compressed data storage area. Is extracted from the immediately preceding portion and written in the location of the destroyed control block (MCB # 2). Further, the data writing unit 15 deletes the compressed data stored in the compressed data storage area (area # 1) when the block destruction detecting unit 14 detects the destruction, and an original image data storage unit 22 described later. The original image data stored in is written.
In the restoration of the free area (area # 2), the data writing unit 15 erases the compressed data that has been written out of the compressed data storage area (area # 1). Can be restored.

FIG. 5 is a schematic diagram showing a restoration state of a destroyed application use area in the memory in the image forming apparatus having the memory management apparatus according to the present embodiment.
In the example shown in FIG. 5, since the destroyed data area is not an empty area but an application area, the data writing unit 15 extracts application data prepared in advance in the duplicate data storage unit 23 in FIG. Thus, the destroyed area can be restored.

  The image processing unit 16 decodes the compressed data stored in the compressed data storage area in response to a print processing request, and generates output image data that can be printed by an engine unit (not shown). Further, when original image data is stored in the compressed data storage area, the image processing unit 16 generates output image data based on the original image data.

The data storage unit 20 is a storage medium such as an HDD (hard disk drive) having a configuration different from that of the memory 13 included in the control unit 10. The data storage unit 20 includes an original image data storage unit (original image data storage unit) 21 and a duplicate data storage unit (duplicate data storage unit) 22.
The original image data storage unit 21 stores the original image data before compression written by the data writing unit 15, and the duplicate data storage unit 22 similarly stores the application (duplicated data) written by the data writing unit 15. To do.

Next, the operation of the image forming apparatus having the memory management apparatus according to the present embodiment will be described with reference to FIG.
FIG. 6 is a flowchart showing the operation of the image forming apparatus according to the present embodiment.
First, the block generation unit 11 generates a control block and a duplication control block for each of a plurality of memory areas (step S601 (block generation step)).
Then, the memory placement unit 12 places the control block and the replication control block generated by the block generation unit 11 (step S602 (memory placement step)). That is, the memory arrangement unit 12 arranges the control block at the head part of the memory area corresponding to the control block, and arranges the replication control block at the head part of the compressed data storage area (data storage area) in which the compressed data is stored.
The area arrangement in the memory arranged in step S602 is as shown in FIG.

Next, when the data writing unit 15 reads image data input from the outside, the data writing unit 15 writes the image data into the original image data storage unit 21 (step S603).
Then, the compression processing unit (not shown) compresses the image data and writes it in the compressed data storage area (step S604).
Subsequently, the block destruction detection unit 14 determines whether there is a destroyed control block (step S605 (block destruction detection step)).
If it is determined in step S605 that there is a destroyed control block, the data writing unit 15 copies the duplicate control block stored immediately before the compressed data storage area, and this destruction. Is written in the control block area (step S606 (data writing step)). Further, the data writing unit 15 copies the original image data from the original image data storage unit 21 and writes the original image data in the compressed data storage area again (step S607 (data writing step)).

After determining that there is no destroyed control block as a result of the determination in step S605, or after the original image data is written in the compressed data storage area in step S607, the control unit 10 performs the printing process. It is determined whether or not a request has been made (step S608).
If it is determined in step 608 that a print processing request has been made, the image processing unit 16 generates output image data based on the compressed data or the original image data (step S609). If the compressed data can be stored in the compressed data storage area, it is determined that there is no control block destroyed in step S605. Therefore, the compressed data stored in step S604 is stored as it is in the compressed data storage area. Yes. On the other hand, if the compressed data does not fit in the compressed data storage area, it is determined that there is a control block destroyed in step S605. Therefore, the original image data written in step S607 is stored in the compressed data storage area. Yes.

Next, a control program for the memory management device will be described.
The memory management function of the computer (memory management apparatus, image forming apparatus) in the present embodiment is realized by a control program of the memory management apparatus stored in storage means (ROM or the like).

When the control program is read into the computer, it sends a command to each component of the computer, and predetermined processing, for example, control block generation processing of the block generation unit, replication control block generation processing, control block arrangement processing of the memory arrangement unit The memory main data (image data, compressed data, application, etc.) storage processing, block destruction detection portion destruction detection processing, data writing portion control block writing processing, data storage means data storage processing, and the like are performed.
Thus, the memory management function is realized by a memory management device or an image forming apparatus in which the control program and the computer cooperate.

Note that the control program for realizing the memory management function can be stored in a computer-readable recording medium such as an external storage device and a portable recording medium in addition to being stored in the ROM or hard disk of the computer. .
The external storage device refers to a memory expansion device that incorporates a storage medium such as a CD-ROM and is externally connected to a memory management device or an image forming apparatus. On the other hand, the portable recording medium is a recording medium that can be mounted on a recording medium driving device (drive device) and is portable, and refers to, for example, a flexible disk, a memory card, a magneto-optical disk, and the like.

The program recorded on the recording medium is loaded into the RAM of the computer and executed by the CPU. By this execution, the function of the memory management device of the present embodiment described above is realized.
Furthermore, when a control program is loaded by a computer, the control program held by another computer can be downloaded to its own RAM or external storage device using a communication line. The downloaded control program is also executed by the CPU, and realizes the memory management function of the memory management apparatus and the image forming apparatus of the present embodiment.

As described above, the memory management device and the control program thereof according to the present invention have been described with reference to preferred embodiments. However, the memory management device and the control program according to the present invention are not limited to the above-described embodiments. It goes without saying that various modifications can be made within the scope of the present invention.
For example, in the above embodiment, the replication control block arranged by the memory arrangement unit 12 is not particularly limited, but is not limited to this, and is positioned next to the memory area including the data storage area where the compressed data is stored. For the control block that manages the memory area to be managed, the replication control block may be arranged at a predetermined location other than the head of the memory area managed by the control block. By doing so, it is possible to minimize the data amount of the replication control block to be held.

The memory management apparatus is provided in the image forming apparatus in the above embodiment, but is not limited to the image forming apparatus. For example, a device equipped with a memory such as a digital camera, a mobile phone, a PHS, or a PDA. And equipment.
Furthermore, the image forming apparatus according to the embodiment can be executed by an image forming apparatus controlled by a control program. The control program for the image forming apparatus is provided by a recording medium, for example. As the recording medium, for example, a magnetic disk, an optical disk, a semiconductor memory, or any other means that can be read by an image forming apparatus can be used.
Also, the control program for the image forming apparatus recorded on the recording medium can be directly loaded into the image forming apparatus and read into the image forming apparatus, and can also be read into the image forming apparatus via a communication line. You may make it.

  For effective use of memory, image data is temporarily compressed and stored, and in response to a print request, the stored compressed data is decompressed and optimally used for a memory management device that obtains output image data it can.

1 is a configuration diagram of an image forming apparatus having a memory management device of the present invention. FIG. 3 is a schematic diagram showing an example of area arrangement in a memory in an image forming apparatus having a memory management device of the present invention. FIG. 3 is a schematic diagram showing an area destruction state in a memory in an image forming apparatus having a memory management device of the present invention. FIG. 3 is a schematic diagram showing a restored state of a destroyed area in a memory in an image forming apparatus having a memory management device of the present invention. FIG. 3 is a schematic diagram showing a restored state of a destroyed application usage area in a memory in an image forming apparatus having a memory management device of the present invention. 3 is a flowchart showing an operation of an image forming apparatus having a memory management device of the present invention.

Explanation of symbols

10 Control Unit 11 Block Generation Unit (Block Generation Unit)
12 Memory allocation unit (memory allocation means)
13 Memory (memory means)
14 Block break detection part (Block break detection means)
15 Data writing part (data writing means)
16 Image processing unit (image processing means)
DESCRIPTION OF SYMBOLS 20 Data storage means 21 Original image data storage part 22 Duplicate data storage part 100 Image forming apparatus

Claims (10)

A memory management device comprising storage means having a plurality of memory areas including a data storage area for storing main data,
For each of the memory areas, a block generating means for generating a control block in which management information for managing the memory area is held, and generating a replication control block that duplicates the control block;
The generated control block is arranged at the head of the memory area corresponding to the control block, and the replication control block is placed at a predetermined location other than the head of the memory area corresponding to the control block before duplication of the replication control block. Memory placement means to be placed in
Block destruction detecting means for detecting destruction of the control block;
A memory management system comprising: a data writing unit that extracts a replication control block corresponding to a control block in which destruction is detected from the predetermined location and writes the replication control block to a head portion of a memory area in which the control block is disposed apparatus. The memory management device according to claim 1,
The one or more data storage areas store compressed data obtained by compressing image data as the main data,
The memory management device includes original image data storage means for storing original image data before compression of the compressed data,
When the block destruction detection unit detects the destruction of the control block, the data writing unit erases the compressed data related to the destruction from the data storage area, and the original image data is stored in the original image data storage unit. The memory management device according to claim 1, wherein the memory management device is fetched and written in the data storage area. The memory management device according to claim 1 or 2,
One or more of the data storage areas store data relating to an application as the main data,
The memory management device includes a replicated data storage unit that stores replicated data obtained by replicating data related to the application,
When the block destruction detecting means detects the destruction of the control block, the data writing means erases the data relating to the application stored in the data storage area managed by the destroyed control block, and the copy A memory management device, wherein the duplicate data is extracted from a data storage means and written in the data storage area. The memory management device according to claim 2 ,
The memory allocation means is the head of the memory area managed by the control block only for the control block managing the memory area located next to the memory area including the data storage area where the compressed data is stored. A memory management device, wherein the memory management device is arranged at a predetermined location other than a section. The memory management device according to claim 4,
One or more of the data storage areas store data relating to an application as the main data,
The memory management device includes a replicated data storage unit that stores replicated data obtained by replicating data related to the application,
When the block destruction detecting means detects the destruction of the control block, the data writing means erases the data relating to the application stored in the data storage area managed by the destroyed control block, and the copy The duplicate data is extracted from the data storage means and written to the data storage area
A memory management device. A control program for a memory management device comprising storage means having a plurality of memory areas including a data storage area for storing main data,
A block generation step for generating a control block in which management information for managing the memory area is held for each of the memory areas, and generating a replication control block that duplicates the control block;
The generated control block is arranged at the head of the memory area corresponding to the control block, and the replication control block is placed at a predetermined location other than the head of the memory area corresponding to the control block before duplication of the replication control block. Memory placement step to be placed in,
A block destruction detection step for detecting destruction of the control block;
A data writing step of extracting a replication control block corresponding to the control block in which the destruction is detected from the predetermined location and writing to the head portion of the data storage area in which the control block is arranged
Have the memory management unit execute
A control program for a memory management device. In the control program of the memory management device according to claim 6,
One or more data storage areas store compressed data obtained by compressing image data as the main data;
An original image data storage step in which the memory management device stores original image data before compression of the compressed data;
When the destruction of the control block is detected in the block destruction detection step, the compressed data related to the destruction is erased from the data storage area in the data writing step, and the original image data is deleted from the original image data storage means. Removing and writing to the data storage area
Have the memory management unit execute
A control program for a memory management device. In the control program of the memory management device according to claim 6 or 7,
One or more of the data storage areas store data relating to an application as the main data;
A duplicate data storage step in which the memory management device stores duplicate data obtained by duplicating data relating to the application;
When the destruction of the control block is detected in the block destruction detection step, the data writing step erases data relating to the application stored in the data storage area managed by the destroyed control block, and the copy Extracting the duplicated data stored in the data storage step and writing it in the data storage area;
Have the memory management unit execute
A control program for a memory management device. In the control program of the memory management device according to claim 7,
For the control block that manages the memory area located next to the memory area that includes the data storage area in which the compressed data is stored in the memory allocation step, the replication control block is the head of the memory area that the control block manages. The step of arranging in a predetermined place other than the section
Have the memory management unit execute
A control program for a memory management device. The control program for a memory management device according to claim 9,
One or more of the data storage areas store data relating to an application as the main data;
A duplicate data storage step in which the memory management device stores duplicate data obtained by duplicating data relating to the application;
When the destruction of the control block is detected in the block destruction detection step, the data writing step erases data relating to the application stored in the data storage area managed by the destroyed control block, and the copy Extracting the duplicated data stored in the data storage step and writing it in the data storage area;
Have the memory management unit execute
A control program for a memory management device.

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