JP6702664B2 - Printing device, printing device control method, program, and storage medium - Google Patents

Description

The present invention relates to a printing apparatus for printing an image on a sheet, a control method for the printing apparatus, a program, and a storage medium.

There are two methods of reading a document, an optical system moving method and a flow reading method. In the optical system moving method, a document is placed on a platen glass (document platen), and the document whose position is fixed is read while moving the optical system. A known technique is to reduce the time (called First Copy Out Time: FCOT) until the sheet is output based on the image data generated by scanning the first page of the original when the original is read by the optical system moving method. Has been. On the other hand, in the flow-reading method, a document is placed on a document tray, and the document is read at a fixed optical system position while being transported by an automatic document feeder (ADF: Auto Document Feeder).

The multifunction peripheral described in Patent Document 1 writes the image data generated by reading the original in the image memory in a non-compressed manner on the first original (first page) of the original conveyed by the ADF. Then, this multifunction peripheral starts reading the image data of one page from the image memory before writing the image data of one page to the image memory, and based on the image data read from the image memory. Print. On the other hand, this multifunction machine compresses the image data generated by reading the original and writes the code data in the image memory after the second sheet (second page) of the original conveyed by the ADF. Then, this multi-function peripheral stores the code data written in the image memory in the HDD, reads the code data stored in the HDD, expands the code data, and prints based on the expanded image data. ..

JP, 2005-5950, A

When copying a document, image data generated by reading the document is stored in a first storage unit such as an image memory, and then the image data read from the first storage unit is stored in an HDD or the like. If it is stored in the second storage means, it takes time to process. Therefore, when the copy of the document is performed, the printing based on the image data of the document stored in the first storage unit is executed rather than the printing based on the image data of the document stored in the second storage unit. It is preferable to do so from the viewpoint of shortening the processing time.

On the other hand, when copying a plurality of pages, all the image data of the originals of a plurality of pages are stored in the first storage unit such as an image memory, and based on the image data of the documents stored in the first storage unit. When printing is attempted, an overflow occurs in the first storage means. This is because the speed at which the image data is written into the first storage means by reading the document is faster than the speed at which the image data is read from the first storage means for printing.

The present invention has been made in view of the above problems. An object of the present invention is to perform printing via the first storage unit until the image data to be printed cannot be read from the first storage unit, and when the image data to be printed cannot be read from the first storage unit, An object of the present invention is to provide an apparatus, a method, and the like that execute printing via the second storage unit.

In order to achieve the above object, a printing apparatus according to an aspect of the present invention has the following configuration. Reading means for reading a document, printing means for executing printing based on image data, first storage means for storing image data of the document read by the reading means, and read from the first storage means A second storage unit for storing the image data that has been read. When the reading unit reads a document of a plurality of pages and the printing unit prints, the reading process of one page and the printing process of the one page are performed. It is possible to operate in parallel, and the speed at which the image data of the document read by the reading unit is stored in the first storage unit is read out from the first storage unit for printing. The printing device is faster than the speed, and the first storage unit is image data of a document read by the reading unit, and image data not printed by the printing unit is the second storage unit. The image data of the original document newly read by the reading unit instead of the image data which is not printed by the printing unit,
When the image data to be printed can be read from the first storage unit, the printing unit executes printing based on the image data to be printed read from the first storage unit, and the printing unit When an error for interrupting the execution of printing has not occurred and the image data to be printed cannot be read from the first storage unit, the image data corresponding to the image data to be printed is: Printing is performed based on the image data read from the second storage unit.

According to the present invention, printing via the first storage unit is executed until the image data to be printed cannot be read from the first storage unit, and the image data to be printed cannot be read from the first storage unit. Then, printing can be executed via the second storage unit.

It is a block diagram showing a configuration of an MFP according to the present embodiment. 3 is a cross-sectional view showing the configuration of the MFP according to the present embodiment. FIG. FIG. 5 is a schematic diagram for explaining a control example according to the first embodiment. FIG. 5 is a schematic diagram for explaining a control example according to the first embodiment. FIG. 5 is a schematic diagram for explaining a control example according to the first embodiment. 5 is a flowchart for explaining a control example according to the first embodiment. 5 is a flowchart for explaining a control example according to the first embodiment. FIG. 3 is a schematic diagram for explaining memory control according to the first embodiment. 5 is a flowchart for explaining a control example according to the first embodiment. FIG. 3 is a schematic diagram for explaining memory control according to the first embodiment. FIG. 5 is a schematic diagram for explaining a control example according to the first embodiment. FIG. 5 is a schematic diagram for explaining a control example according to the first embodiment. It is a schematic diagram for explaining a control example according to the second embodiment. It is a schematic diagram for explaining a control example according to the second embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Note that the following embodiments do not limit the present invention according to the claims, and all combinations of the features described in the present embodiments are not necessarily essential to the solving means of the present invention. ..

[First Embodiment]
In the first embodiment, the printing device stores image data generated by reading a plurality of originals in the first storage unit. Then, the printing device stores the image data read from the first storage unit in the second storage unit. Then, the printing device executes printing based on the image data stored in any one of the first storage unit and the second storage unit.

The printing apparatus executes printing based on the image data of the original document stored in the first storage unit until it cannot perform printing based on the image data of the original document stored in the first storage unit. On the other hand, when the printing apparatus cannot perform printing based on the image data of the original document stored in the first storage unit, it performs printing based on the image data of the original document stored in the second storage unit. With such control, when the copy of the multi-page original is executed, the multi-page original is read without causing an overflow in the first storage unit, and based on the image data generated by reading the multi-page original. Reduce the processing time to execute printing.

The details will be described below.

The configuration of the MFP 103, which is an example of the printing apparatus according to the first embodiment of the present invention, will be described with reference to the block diagram of FIG. The MFP is a Multi Functional Peripheral.

The MFP 103 has an image reading function of reading a document and generating image data, and a printing function (copy function) of printing an image on a sheet based on the generated image data. Further, the MFP 103 has a print function (PC print function) that receives a print job from an external device such as a PC and prints characters and images on a sheet based on the data for which a print instruction has been received. The printing by the printing function may be color or monochrome.

The controller unit 110 of the MFP 103 is connected to the scanner unit 130, which is an image input device, and the printer unit 140, which is an image output device, and controls the input/output of image information.

The scanner unit 130 scans an image of a document using an optical sensor and acquires scan image data. The scanner unit 130 includes a control unit having a CPU, a RAM, a ROM, a device I/F, and the like, and a scanner device. Details of the scanner unit 130 will be described later with reference to FIG.

The printer unit 140 prints an image on a sheet based on image data input from the scanner unit 130, a PC, or the like. Details of the printer unit 140 will be described later with reference to FIG.

Further, the controller unit 110 is connected to the operation unit 150 corresponding to an example of the user interface unit. The operation unit 150 has a display unit and a key input unit. The operation unit 150 has a function of providing information to the user via the display unit. In addition, the display unit includes an LCD (Liquid Crystal Display: liquid crystal display unit) and a touch panel sheet having a transparent electrode (may be a capacitance type) attached on the LCD. The operation unit 150 has a function of accepting various settings from the user via the touch panel sheet. The LCD displays not only the operation screen but also the status of the MFP 103. The key input unit includes, for example, a start key used for instructing the start of execution of scanning, copying, etc., and a stop key used for instructing the suspension of operations in operation such as scanning, copying, etc. ..

Further, the controller unit 110 is connected to an external device (information processing device) such as a PC or a file sharing server via the network 104, and performs processing such as receiving a print job from the external device. The network 104 may be a LAN (Local Area Network) such as a local area network, or a WAN (Wide Area Network) such as the Internet.
The controller unit 110 includes a CPU 111, a RAM 112, a ROM 113, a HDD 114, a network I/F 115, a device I/F 116, an operation unit I/F 117, an image processing unit 118, and an image memory 120. The respective modules are connected to each other via the system bus 125.

The CPU 111 is a processor that controls the entire MFP 103. The CPU 111 comprehensively controls access to various connected devices based on a control program or the like stored in the ROM 113.

The network I/F 115 is an interface for controlling communication with an external network. The network I/F 115 connects the MFP 103 to the network 104 and performs communication control for transmitting the image data input from the scanner unit 130 to an external device such as a PC or a file sharing server.

The HDD 114 is a storage unit that mainly stores information (system software) necessary for starting and operating a computer and image data. The HDD 114 also stores job setting information (for example, copy job setting information) received from the user via the operation unit 150.

The RAM 112 is a readable/writable memory. The RAM 112 is also a system work memory for the CPU 111 to operate. The RAM 112 stores image data input from the scanner unit 130, a PC, etc., various programs, setting information, and the like.

The ROM 113 is a read-only memory. The ROM 113 is a boot ROM. The ROM 113 stores a system boot program in advance.
The ROM 113 or the HDD 114 stores (stores) various control programs that are executed by the CPU 111 and that are necessary to execute various processes in the flowcharts described below.
Further, the ROM 113 or the HDD 114 stores a program for executing rasterization and the like.
Further, the ROM 113 or the HDD 114 also stores a display control program for displaying various UI screens on the display unit of the operation unit 150 including a user interface screen (hereinafter, UI screen).

The CPU 111 reads the program stored in the ROM 113 or the HDD 114 and expands the program in the RAM 112 to execute various operations according to this embodiment.

The device I/F 116 connects the scanner unit 130, the printer unit 140, and the controller unit 110, and performs synchronous/asynchronous conversion of image data.

The operation unit I/F 117 is an interface that connects the operation unit 150 and the controller unit 110, and outputs image data to be displayed on the operation unit 150 to the operation unit 150. The operation unit I/F 117 also transmits information input by the user from the operation unit 150 to the CPU 111.

The image processing unit 118 performs image processing on image data included in print data received via the network 104, and also performs image processing on image data input/output from the device I/F 116.
The image processing unit 118 stores the image data included in the print data received via the network 104 or the image data generated by the reading of the document by the scanner unit 130 in the image memory 120. Then, the image processing unit 118 performs image processing on the image data stored in the image memory 120 in accordance with the value of a register in the image processing circuit (for example, color mode, magnification, reading resolution, output resolution, rotation angle, etc.). Execute the conversion process. Here, the image conversion processing is, for example, rotation processing, resolution conversion processing, scaling processing, or the like. Then, the image processing unit 118 stores the converted image data in the image memory 120 again.

The compression/expansion unit 119 performs a process of compressing/expanding the image data stored in the image memory 120 by various compression methods such as JBIG and JPEG, and a process of expanding the image data stored in the HDD 114. The compression/expansion unit 119 also includes an image processing block that stores compressed image data and expanded image data in the image memory 120 or the HDD 114 again.

The image memory 120 is a memory (storage unit) for temporarily expanding the image data processed by the image processing unit 118 and writing the expanded image data. The image memory 120 has, for example, an area for storing low-compression image data (first image memory area 121 and fourth image memory area 124) and an area for storing coded image data (second image memory area). An image memory area 122 and a third image memory area 123) are provided.
An address for storing the image data in the image memory 120 is designated for each page of the image data. Then, the RAM 112 stores information about which page of the image memory 120 stores the image data of which page.

The first image memory area 121 is an area specified by an address “0x20000000” (hereinafter, also referred to as an address (a)), for example. If the size of the low-compression image data to be stored in the image memory 120 is 133 MBytes, an area for 133 MBytes from the address “0x20000000” is secured.

The second image memory area 122 is, for example, an area specified by the address “0x70000000” (hereinafter, also referred to as address (b)). If the size of the code image data to be stored in the image memory 120 is 25 MByte, an area for 25 MByte from the address “0x70000000” is secured.

The third image memory area 123 is, for example, an area specified by the address “0x80000000” (hereinafter, also referred to as address (c)). If the size of the code image data to be stored in the image memory 120 is 25 MByte, an area for 25 MByte from the address “0x80000000” is secured.

The fourth image memory area 124 is, for example, an area specified by the address “0x90000000” (hereinafter, also referred to as address (d)). If the size of the low-compression image data to be stored in the image memory 120 is 133 MBytes, an area for 133 MBytes from the address “0x90000000” is secured.
The size of the area secured in the image memory 120 is the same in the first image memory area 121 and the fourth image memory area 124, and the second image memory area 122 and the third image memory area are the same size. The size is the same as 123.
The size to be secured as the first image memory area 121, the second image memory area 122, the third image memory area 123, and the fourth image memory area 124 depends on the compression rate and the size of the image data. May be changed. Further, the start of the address for storing the image data in the image memory 120 is started by the first image memory area 121, the second image memory area 122, the third image memory area 123, and the fourth image memory area 124. May be assigned without any interval.

Next, the configuration of the MFP 103 will be described with reference to the sectional view of FIG. The MFP 103 includes a scanner unit 130 and a printer unit 140.

First, the operation of the scanner unit 130 will be described with reference to the sectional view of FIG.
The scanner unit 130 has an automatic document feeding unit 450. The automatic document feeder 450 has a document tray 30 on which the documents 32 are stacked, and feeds the documents 32 placed on the document tray 30. Then, the scanner unit 130 reads the image of the fed original 32 at the position of the fixed optical system. The details will be described below.

The automatic document feeder 450 regulates the document tray 30 on which a document bundle composed of one or more documents 32 is stacked, and the document bundle protruding from the document tray 30 and advancing to the downstream side before the start of conveyance of the document 32. The separating pad 21 and the feeding roller 1 are provided.

The feeding roller 1 falls on the document surface of the document stack stacked on the document tray 30 and rotates. As a result, the uppermost original 32 of the original stack is fed. The plurality of originals 32 fed by the feeding roller 1 are separated and fed one by one by the action of the separating roller 2 and the separating pad 21. This separation is realized by the well-known retard separation technique.

The original 32 separated by the separation roller 2 and the separation pad 21 is conveyed to the registration roller 4 by the conveyance roller pair 3. Then, the conveyed original 32 is abutted against the registration roller 4. As a result, the original 32 is formed in a loop shape, so that skewing in the conveyance of the original 32 is eliminated. On the downstream side of the registration rollers 4, there is arranged a feeding path for feeding the original 32 that has passed through the registration rollers 4 toward the reading glass 201.

The original 32 sent to the feeding path is sent to the platen by the large roller 7 and the feeding roller 5. Here, the large roller 7 contacts the flow reading glass 201. The original 32 fed by the large roller 7 passes through the conveying roller 6 and moves between the roller 16 and the discharge flapper. Then, the original 32 is ejected to the original ejection tray 31 via the ejection flapper and the ejection roller 8.
The scanner unit 130 can read the image on the back surface of the original 32 by reversing the original 32. Specifically, in a state where the document 32 is bitten by the discharge roller 8, the discharge roller 8 is reversed to switch the discharge flapper, thereby moving the document 32 to the reverse path 19. The moved original 32 is abutted against the registration roller 4 from the reversing path 19 and the original 32 is formed again in a loop shape, thereby eliminating the skew in the conveyance of the original 32. After that, the original 32 is flown again to the reading glass 201 by the feeding roller 5 and the large roller 7. As a result, the scanner unit 130 can read the image on the back surface of the document 32 passing through the flow scanning glass 201.

The scanner unit 130 optically scans the image information recorded on the document placed on the platen glass 202 by scanning the optical scanner unit 209 in the sub-scanning direction shown by the arrow in FIG. read. On the other hand, the originals 32 on the original tray 30 are conveyed one by one to the reading center position by the automatic original feeding section 450. Then, the scanner unit 130 moves the optical scanner unit 209 so that it comes to the reading center position of the large roller 7 of the automatic document feeding unit 450, and reads the document 32 at the reading center position of the large roller 7.

Then, the original 32 on the original tray 30 or the original on the original table glass 202 is read by the following optical system. This optical system includes a scanning glass 201, a document table glass 202, an optical scanner unit 209 having an optical lamp 203 and a mirror 204, mirrors 205 and 206, a lens 207, and a CCD sensor unit 210. In the present embodiment, the CCD sensor unit 210 is composed of a CCD 211 (a color image reading (RGB) CCD (3 line sensor unit) and a monochrome image reading CCD (1 line sensor unit)). ..

The image information read by this optical system is photoelectrically converted and input as image data to the controller unit 110 described with reference to FIG. In the present embodiment, the case where the optical system included in the scanner unit 130 is the reduction optical system that forms the reflected light from the original 32 on the CCD sensor is described, but the present invention is not limited to this. The optical system included in the scanner unit 130 may be an equal-magnification optical system that forms an image of the reflected light from the original 32 on a CIS (Contact Image Sensor).

Next, the operation of the printer unit 140 will be described with reference to the sectional view of FIG. The printer unit 140 performs an operation (print operation) of outputting an image on the sheet 301 based on the image data transferred to the printer unit 140. The details will be described below.

The image data transferred to the printer unit 140 is converted by the laser unit 332 into laser light according to the image data. Then, the laser light is applied to the photoconductor drums (323 to 326), and an electrostatic latent image corresponding to the image data is formed on the photoconductor drums (323 to 326). Toners (developer) are attached to the latent image portions of the photoconductor drums (323 to 326) by the developing units (327 to 330). The color machine includes four photosensitive drums (323 to 326) and four developing units (327 to 330) for cyan, yellow, magenta, and black.

The printer unit 140 also includes cassettes (351 to 354) and a manual feed tray 350 as sheet storage units (also referred to as paper feed stages).

The cassettes (351 to 354) have a drawer type shape and can accommodate a plurality of sheets (for example, 600 sheets) 301. On the other hand, the manual feed tray 350 has an insertable shape and can store a plurality of sheets (for example, 100 sheets) 301.

The printer unit 140 transfers the toner attached to the photoconductor drums (323 to 326) to the sheet 301 fed from any of the cassettes (351 to 354) and the manual feed tray 350. Then, the sheet 301 on which the toner is transferred is conveyed to the fixing unit 333. Then, the toner is fixed on the sheet 301 by heat and pressure. The sheet 301 that has passed through the fixing unit 333 is discharged to a discharge tray 345 (discharge unit) included in the MFP 103 by the transport rollers 334 and 335.

The MFP 103 has been described as a color machine including four photoconductor drums (323 to 326) and four developing units (327 to 330), but the present invention is not limited to this. Even if the MFP 103 is a monochrome machine including one photoconductor drum 326 and one developing unit 330, the present invention can be similarly applied.

Although the method of printing an image on the sheet 301 by the electrophotographic method has been described, the present invention is not limited to this. The present invention can be similarly applied to any method as long as an image can be printed on the sheet 301, such as an inkjet method or another method (for example, a thermal transfer method).

In the first embodiment, the printing apparatus stores image data generated by reading a plurality of documents in the first storage unit (for example, the image memory 120). Subsequently, the printing apparatus stores the image data read from the first storage unit in the second storage unit (for example, HDD 114). Then, the printing device executes printing based on the image data stored in any one of the first storage unit and the second storage unit.

The printing apparatus executes printing based on the image data of the original document stored in the first storage unit until it cannot perform printing based on the image data of the original document stored in the first storage unit. On the other hand, when the printing apparatus cannot perform printing based on the image data of the original document stored in the first storage unit, it performs printing based on the image data of the original document stored in the second storage unit. With such control, when the copy of the multi-page original is executed, the multi-page original is read without causing an overflow in the first storage unit, and based on the image data generated by reading the multi-page original. Reduce the processing time to execute printing.

The details will be described below.
A series of processes (S3001 to S3003) from the input of the video signal from the scanner unit 130 to the storage of the encoded image data in the HDD 114 will be described with reference to the schematic diagram shown in FIG.

The CPU 111 sets the scan image path 3000 shown in FIG. 3A that defines the order of image processing for scanning and the order of image areas. Then, the CPU 111 executes the processes of S3001 to S3003 after setting the scan image path 3000. Further, the CPU 111 sets various parameters for the image processing unit 118 to perform the image processing described later in S3001 to S3003.

S3001 is a process of converting the video signal input from the scanner unit 130 into low-compression image data. The low-compression image data converted in S3001 is stored in the first image memory area 121 referenced by the address (a) of the image memory 120.

S3002 is a compression process of compressing the low-compression image data stored in the first image memory area 121 by the compression/expansion unit 119 to generate coded image data. The low-compression image data is image data with a low compression rate. The low-compression image data may be uncompressed image data (uncompressed image data). On the other hand, the coded image data is image data having a higher compression rate than the low compression image data. That is, the low-compression image data has a larger data amount than the code image data. The coded image data generated in S3002 is stored in the second image memory area 122 referenced by the address (b) of the image memory 120.

S3003 is a process of storing the code image data stored in the second image memory area 122 in the HDD 114. By the process of S3003, the original of the second page following the first page is read without waiting for the completion of the reading of the code image data of the original of the first page stored in the second image memory area 122. The encoded image data can be stored in the second image memory area 122. For this reason, it is possible to prevent the start of reading the original of the second page following the first page from being delayed.

It should be noted that the CPU 111 secures a resource for storing data in each of the first image memory area 121, the second image memory area 122, and the HDD 114 at the start of the scanning process. For example, it is assumed that the size of the read document is “A4” and the read resolution is “600 dpi” (32 bit per pixel). In this case, for the first image memory area 121, for example, a resource for storing data of 133 MBytes (low compression image data) is secured. On the other hand, for the second image memory area 122, for example, a resource for storing 25 MBytes of data (coded image data) is secured.

After the compression processing described in S3002 is completed, the CPU 111 releases the resources of the first image memory area 121. Further, the CPU 111 releases the resources of the second image memory area 122 after the storage processing described in S3003 is completed.

Note that the low-compression image data stored in the first image memory area 121 is deleted as the resources of the first image memory area 121 are released. Further, as the resources of the second image memory area 122 are released, the code image data stored in the second image memory area 122 is deleted. Therefore, overflow does not occur in the image memory 120.

Subsequently, a series of processes (S4001 to S4003) after the data is read from the image memory 120 or the HDD 114 and the video signal is output to the printer unit 140 will be described with reference to the schematic diagram shown in FIG. Explain.

The CPU 111 sets a print image path 4000 shown in FIG. 3B that defines the order of image processing for printing and the order of image areas. Then, the CPU 111 executes the processes of S4001 to S4003 after setting the print image path 4000. The CPU 111 sets various parameters for the image processing unit 118 to perform the image processing described later in S4001 to S4003.

S4001 is a process of reading the code image data stored in the HDD 114. The coded image data read from the HDD 114 in S4001 is stored in the third image memory area 123 referenced by the address (c) of the image memory 120.

S4002 is a decompression process for decompressing the code image data stored in the third image memory area 123 by the compression/decompression unit 119 to generate low-compression image data. The low-compression image data generated in S4002 is stored in the fourth image memory area 124 referenced by the address (d) of the image memory 120.

In step S4003, the low compression image data stored in the fourth image memory area 124 is converted into a video signal and output to the printer unit 140.

It should be noted that the CPU 111 secures a resource for storing data in each of the third image memory area 123, the fourth image memory area 124, and the HDD 114 when starting the print processing.

It is assumed that the resources of the first image memory area 121 in which the low-compressed image data of the original of the same page is stored are not released at the timing of executing the print process. In this case, the CPU 111 refers to the address (d) for referring to the fourth image memory area 124 and the first image memory area 121 as the address for reading the low compression image data from the image memory 120. Address (a) of

That is, the CPU 111 may read the low-compression image data stored in the area designated by the address (a) of the image memory 120 as preprocessing for outputting the video signal to the printer unit 140. In other words, since the CPU 111 acquires the low compression image data stored in the first image memory area 121, the processing of S4001 and S4002 described in FIG. 3B can be omitted. Therefore, compared with the case where all the processing in S4001 to S4003 is executed, the time until the printing of the image on the sheet is started can be shortened.

When the address for reading the low-compression image data from the image memory 120 is replaced, the low-compression image data of the original of the same page is not stored in the fourth image memory area 124. The resource of the fourth image memory area 124 that has been secured once becomes unnecessary, so the CPU 111 releases the resource of the fourth image memory area 124. When the address for reading the low-compression image data from the image memory 120 is replaced, the code image data of the original on the same page is not stored in the third image memory area 123. Since the resources of the third image memory area 123 that have been once secured are unnecessary, the CPU 111 releases the resources of the third image memory area 123. By releasing the unnecessary resources of the image memory 120 in this way, the resources of the image memory 120 can be allocated for the scan processing of other pages.

On the other hand, the resources of the first image memory area 121 in which the low-compressed image data of the original of the same page is stored are released at the timing of executing the print process, and the second image in which the code image data of the original of the same page is stored It is assumed that the resources of the memory area 122 have not been released. In this case, the CPU 111 uses the address (c) for referring to the third memory area 123 and the address for referring to the second image memory area 122 as the addresses for reading the coded image data from the image memory 120. Replace with (b).

That is, the CPU 111 may read the code image data stored in the area specified by the address (b) of the image memory 120 as a pre-process for outputting the video signal to the printer unit 140. In other words, since the CPU 111 acquires the code image data stored in the second image memory area 122, the process of S4001 described in FIG. 3B can be omitted. Therefore, compared with the case where all the processing in S4001 to S4003 is executed, the time until the printing of the image on the sheet is started can be shortened.

When the address for reading the code image data from the image memory 120 is replaced, the code image data is not stored in the third image memory area 123. Since the resources of the third image memory area 123 that have been once secured are unnecessary, the CPU 111 releases the resources of the third image memory area 123. By releasing the unnecessary resources of the image memory 120 in this way, the resources of the image memory 120 can be allocated for the scan processing of other pages.

On the other hand, at the execution timing of the print process, the resources of the first image memory area 121 in which the low-compressed image data of the original of the same page is stored are released, and the second image data of the original of the same page is stored. It is assumed that the resources of the image memory area 122 have been released. In this case, the CPU 111 reads the coded image data from the HDD 114 and performs the processes of S4001, S4002, and S4003.

Next, in the MFP 103 according to the first embodiment, the order of processing when the scan processing is operated will be described with reference to the schematic diagrams of FIGS. 4A to 4D.

FIG. 4A shows a phase in which the process of S3001 is executed and low-compressed image data is stored in the first image memory area 121.

FIG. 4B shows a phase in which the low-compression image data is stored in the first image memory area 121, and then the process of S3002 is executed to store the code image data in the second image memory area 122. Represent

FIG. 4C shows a phase in which the code image data is stored in the second image memory area 122 and then the process of S3003 is executed to store the code image data in the HDD 114. At this time, the resources of the first image memory area 121 are released. Therefore, the resources of the first image memory area 121 can be allocated for the scan processing of other pages.

FIG. 4D shows a state where the scan process is completed and the code image data is stored in the HDD 114. At this time, the resources of the first image memory area 121 and the second image memory area 122 are released. Therefore, the resources of the first image memory area 121 and the resources of the second image memory area 122 can be allocated for the scan processing of other pages.

Next, in the MFP 103 according to the first embodiment, the order of the processing when the scan processing and the print processing are operated in parallel during the operation of the copy processing will be described with reference to the schematic diagrams of FIGS. I will explain each. 5A to 5D show that the printing process is started in any of the phases described in FIGS. 4A to 4D.

In the MFP 103 according to the first embodiment, it is assumed that the speed at which image data is written to the image memory 120 by reading a document is faster than the speed at which image data is read from the image memory 120 for printing. To do.

In the copy processing operation according to the first embodiment, the address (d) for referring to the fourth image memory area 124 is replaced with the address (a) for referring to the first image memory area 121. The following description will be given assuming that the setting is made possible.

Further, in the copy processing operation according to the first embodiment, the address (c) for referring to the third image memory area 123 is replaced with the address (b) for referring to the second image memory area 122. The following description will be given assuming that the setting is made possible.

FIG. 5A shows the processing content of the copy processing operation when the print processing is started in the phase of the scan processing described in FIG. 4A. In the phase of this copy processing operation, the address (d) for referencing the fourth image memory area 124 is replaced with the address (a) for referencing the first image memory area 121. Be done. Then, in the processing of S4003, the low-compression image data stored in the first image memory area 121 is read. That is, in the copy processing operation of FIG. 5A, the copy processing operation is performed only by the processing of S3001 described in FIG. 3A and the processing of S4003 described in FIG. 3B.

That is, in the print process of FIG. 5A, the CPU 111 acquires the low-compression image data stored in the first image memory area 121, and therefore, the processes of S4001 and S4002 described in FIG. 3B are performed. It can be omitted. Therefore, compared with the case where all the processing in S4001 to S4003 is executed, the time until the printing of the image on the sheet is started can be shortened.

Further, in the scan process of FIG. 5A, the process of S3002 and S3003 described in FIG. 3A is performed in order to store the code image data in the HDD 114. In this way, by storing the code image data in the HDD 114, even if an abnormality occurs in the print processing (for example, when a print jam or the like occurs), the print processing can be restarted after the recovery from the abnormality. You can

FIG. 5B shows the processing content of the copy processing operation when the print processing is started in the phase of the scan processing described in FIG. 4B. In the phase of this copy processing operation, the processing of S3001 is completed and the processing of S3002 is being executed. That is, in this phase, the resources of the first image memory area 121 are being used for the processing of S3002. In other words, the resources of the first image memory area 121 are not yet released in this phase. Therefore, as in the copy processing operation of FIG. 5A, in the copy processing operation of FIG. 5B, the address (d) for referring to the fourth image memory area 124 is the first image memory. The address (a) for referencing the area 121 is replaced with the address for referencing. Then, in the processing of S4003, the low-compression image data stored in the first image memory area 121 is read. That is, in the copy processing operation of FIG. 5B, the copy processing operation is performed only by the processing of S3001 and S4003.

That is, in the print process of FIG. 5B, the CPU 111 acquires the low-compression image data stored in the first image memory area 121, and therefore, the processes of S4001 and S4002 described in FIG. 3B are performed. It can be omitted. Therefore, compared with the case where all the processing in S4001 to S4003 is executed, the time until the printing of the image on the sheet is started can be shortened.

In the scan process of FIG. 5B, the process of S3002 and the process of S3003 are performed to store the code image data in the HDD 114. Thus, by storing the code image data in the HDD 114, even if an abnormality occurs in the print processing (for example, when a print jam or the like occurs), the print processing is restarted after the recovery from the abnormality. You can

FIG. 5C shows the processing content of the copy processing operation when the print processing is started in the phase of the scan processing described in FIG. 4C. In the phase of this copy processing operation, the processing of S3001 and S3002 is completed, and the processing of S3003 is being executed. That is, in this phase, the resource of the second image memory area 122 is being used for the processing of S3003. In other words, the resources of the second image memory area 122 are not yet released in this phase. On the other hand, in this phase, the resources of the first image memory area 121 are in a released state. Therefore, in the copy processing operation of FIG. 5C, the address (c) for referring to the third image memory area 123 refers to the address (b) for referring to the second image memory area 122. Will be replaced with the address for Then, in the processing of S4002, the code image data stored in the second image memory area 122 is read. That is, in the copy processing operation of FIG. 5C, the copy processing operation is performed in the processing of S3001, S3002, S4002, and S4003.

That is, in the print process of FIG. 5C, the CPU 111 acquires the code image data stored in the second image memory area 122, and thus the process of S4001 described in FIG. 3B can be omitted. it can. Therefore, compared with the case where all the processing in S4001 to S4003 is executed, the time until the printing of the image on the sheet is started can be shortened.

Further, in the scan processing of FIG. 5C, the processing up to S3003 is performed in order to store the code image data in the HDD 114. In this way, by storing the code image data in the HDD 114, even if an abnormality occurs in the print processing (for example, when a print jam or the like occurs), the print processing can be restarted after the recovery from the abnormality. You can

FIG. 5D shows the processing content of the copy processing operation when the print processing is started in the phase of the scan processing described in FIG. 4D. In this copy processing operation phase, the processing of S3001, S3002, and S3003 is completed. That is, in this phase, the resources of the first image memory area 121 are released, and the resources of the second image memory area 122 are also released. Further, in this phase, the HDD 114 stores the code image data. Therefore, in the copy processing operation of FIG. 5D, the replacement of the address for referring to the image memory 120 is not performed. That is, the CPU 111 reads the coded image data stored in the HDD 114, and then performs the copy processing operation in the processing of S4001, S4002, and S4003.

In the copy processing operation of FIG. 5D, the second page following the first page is not waited for until the reading of the code image data of the original of the first page stored in the second image memory area 122 is completed. The code image data of the original of the page can be stored in the second image memory area 122. For this reason, it is possible to prevent the start of reading the original of the second page following the first page from being delayed. Further, since the code image data stored in the second image memory area 122 is stored in the HDD 114, the resources of the second image memory area 122 are released, so that the image memory 120 may overflow. Absent.

Next, regarding the timing chart of the copy processing operation in the phase of the copy processing operation described above in FIG. 5A (hereinafter, this phase is referred to as “copy parallel processing mode”), the schematic diagram of FIG. 11A is shown. It will be explained using.

Timing 1101 indicates the timing when the copy job is started in response to the pressing of the start key.

Timing 1118 shows the timing at which the output of the print video ends.

The MFP 103 according to the first embodiment assumes a case where the speed at which image data is written to the image memory 120 by reading a document is faster than the speed at which image data is read from the image memory 120 for printing. In the first embodiment, in such an MFP 103, by continuing to operate in the copy parallel processing mode until the MFP 103 can operate in the copy parallel processing mode, the time taken from timing 1101 to timing 1118 is shortened. To do.

The commands 1102, 1103, 1104, 1105, and 1106 are commands exchanged between the device I/F of the scanner unit 130 and the device I/F 116 of the controller unit 110. Further, these commands 1102 to 1106 are also commands for the controller unit 110 and the control unit of the scanner unit 130 to operate in synchronization with each other.

The command 1102 is a preparation request for pulling in the original 32. Upon receiving the command 1102, the control unit of the scanner unit 130 performs initial setting and the like for pulling in the originals 32 stacked on the original tray 30.

The command 1103 is a response command to the command 1102. Upon receiving the command 1102, the controller unit 110 determines that preparation for pulling in the original 32 has been made. Upon receiving the command 1102, the CPU 111 of the controller unit 110 sets the scan image path 3000 of FIG. 3A that defines the order of image processing for scanning and the order of image areas.

The command 1104 is a start request for pulling in the original 32. Upon receiving the command 1104, the control unit of the scanner unit 130 starts pulling in the originals 32 stacked on the original tray 30.

The command 1105 is a response command to the command 1104. Upon receiving the command 1105, the controller unit 110 determines that the pulling in of the original 32 has started. At this time, the control unit of the scanner unit 130 may notify the controller unit 110 of information indicating that the pulling in of the original 32 is normally started.

The command 1106 is a scan video request, and is a command for requesting input of a video signal of a scan image from the scanner unit 130. The command 1106 corresponds to a command for the CPU 111 of the controller unit 110 to instruct the scanner unit 130 to read the original 32.

The interrupt 1107 is a scan video start interrupt. After the notification of the interrupt 1107, the video signal of the scan image is continuously input to the controller unit 110. Then, the video signal of the scan image input to the controller unit 110 is subjected to image processing via the image processing unit 118 of the controller unit 110.

The video 1115 is a schematic representation of the video signal of the scanned image.

Timing 1116 indicates the end timing of the video signal of the scan image.

The commands 1110, 1111 and 1113 are commands exchanged between the printer unit 140 and the device I/F 116 of the controller unit 110.

The command 1110 is a start request for sheet feeding. Upon receiving the command 1110, the printer unit 140 starts feeding sheets stored in the cassettes (351 to 354) or sheets held in the manual feed tray 350.

The command 1111 is a response command to the command 1110. The controller unit 110 receives the command 1111 and determines that the sheet feeding is started.

The command 1113 is a print video request, and is a command for requesting the printer unit 140 to start output of a video signal of a print image. The command 1113 corresponds to a command for the CPU 111 of the controller unit 110 to instruct the printer unit 140 to print.

The interrupt 1114 is a print video start interrupt. After the notification of the interrupt 1114, the video signal of the print image is continuously input to the printer unit 140. Then, the printing operation in the printer unit 140 is performed based on the video signal of the print image input to the printer unit 140.

The video 1117 schematically represents the video signal of the print image.

An event 1109 and an event 1112 are print processing start events.

Event 1109 is a print preparation start event. When the controller unit 110 receives the event 1109, the command 1110 is notified to the printer unit 140. Further, as the CPU 111 of the controller unit 110 receives the event 1109, as shown in FIG. 3B, the print image path 4000 defining the order of image processing for printing and the order of image areas is set. Set. Further, the CPU 111 sets various parameters for performing the image processing described in S4001 to S4003 of FIG. 3B in the image processing unit 118, and secures resources to be secured in the image memory area of the image memory 120. To do.

When the MFP 103 is operating in the copy parallel processing mode, the event 1109 is notified by the print side processing after receiving the command 1105 by the scan side processing.

Event 1112 is a print process start event. As the controller unit 110 receives the event 1112, the command 1113 is notified to the printer unit 140. An event 1112 occurs in response to the notification of the interrupt 1107.

The schematic diagram of FIG. 11B is a timing chart of the copy processing operation in the phase of the copy processing described above with reference to FIG. 5B. In the schematic diagram of FIG. 11B, the same numbers and the like as the operations and commands in the copy parallel processing mode described above with reference to FIG. ..

In the copy processing operation in the copy processing phase described above with reference to FIG. 5B, the print preparation start event is issued after the storage of the image data in the first image memory area 121 is completed. Therefore, the controller unit 110 receives the event 1150 that is the start event of the print processing after receiving the scan video for the predetermined image data size (that is, after the timing 1116). Then, after the controller unit 110 receives the event 1150, the command 1110, the command 1111 and the command 1113 are sequentially exchanged between the printer unit 140 and the device I/F 116 of the controller unit 110.

As described above, in the copy parallel processing mode, compared with the copy processing operation described above with reference to FIG. 5B, the time from the occurrence of the scan video start interrupt to the end timing of the scan image video signal (1107 to 1116) It is possible to accelerate the start of preparation for print processing.

The MFP 103 according to the first embodiment assumes a case where the speed at which image data is written to the image memory 120 by reading a document is faster than the speed at which image data is read from the image memory 120 for printing. In the first embodiment, in such an MFP 103, by continuing to operate in the copy parallel processing mode until the MFP 103 can operate in the copy parallel processing mode, the time taken from timing 1101 to timing 1118 is shortened. can do.

Next, in the MFP 103 according to the first exemplary embodiment, a series of processes for executing a copy job that has received an execution instruction will be described with reference to the flowchart shown in FIG. This processing is performed by the CPU 111 executing the control program read from the ROM 113 or the HDD 114 and expanded in the RAM 112. The process of FIG. 6 is started in a state where the execution screen for executing the copy process is displayed on the display unit of the operation unit 150.

First, the CPU 111 determines whether or not the start key is pressed by the user via the operation unit 150 (S701). When the CPU 111 determines that the start key is pressed (S701: Yes), the process proceeds to S702. On the other hand, when determining that the start key is not pressed (S701: No), the CPU 111 repeats the processing of S701 until it is determined that the start key is pressed.

Subsequently, the CPU 111 obtains copy job setting information (for example, the number of copies, color selection, magnification, paper selection, page printing, page layout, bookbinding, and the like) from the HDD 114 (S702). It is assumed that the setting information of the copy job is stored in the HDD 114 according to the setting of the copy job received from the user through the operation unit 150 before the start key is pressed in S701.

Subsequently, the CPU 111 outputs a command instructing the scanner unit 130 to start a scan process (S750) described later with reference to FIG. 7 (S703). Then, the scanner unit 130 executes the scan process (S750) in response to receiving the instruction (called a scan instruction) from the CPU 111.

When the controller unit 110 receives the print preparation start event (event 1109), the CPU 111 instructs the printer unit 140 to start a print process (S800) described below with reference to FIG. (Corresponding) is output (S704). Then, the controller unit 110 executes the print process (S800) when the printer unit 140 receives the instruction (which is called a print instruction).

When the setting information of the copy job acquired in S702 is the specific value, the CPU 111 causes the scanner unit 130 and the printer unit 140 to perform the scan process (S750) and the print process (S800) in parallel. Command to start the copy process.

For example, when the copy information is set to “1×”, the number of copies is set to “1”, the color mode is not “automatic selection”, and the paper feed tray is not “automatically selected”, the scan processing (S750) and print processing (S800) are executed in parallel to execute the copy processing.

Note that the magnification is “equal size” means that the magnification is “100%” by the user or, for example, the original size is A4 and the output paper size is A4. That is. On the other hand, when the magnification is not “actual size” (that is, “variable magnification”), for example, when the magnification is “86%” by the user, or when the document size is B4 and the output paper size is This is the case when A3 is designated.

The color mode being “automatically selected” means that the CPU 111 analyzes the image data generated by reading the document to determine whether the read document is color or black and white. When the user previously specifies that the read document is “color” or “monochrome”, the color mode is not “automatic selection”.

When the paper feed tray is “automatically selected”, the cassettes 351 to 354 that store sheets of a size that matches the output paper size are searched, and the sheets of the size that matches the output paper size are stored. Feeding sheets from a cassette. The output paper size is determined based on, for example, the size of the read document and the magnification. On the other hand, the case where the sheet feed tray is not “automatically selected” means, for example, a case where the cassettes 351 to 354 for feeding the sheets to be output and the manual feed tray 350 are designated in advance by the user.

Next, in the MFP 103 according to the first exemplary embodiment, a series of processes (S750) for executing the scan process of the copy job that has received the execution instruction will be described with reference to the flowchart shown in FIG. This processing is performed by the CPU 111 executing the control program read from the ROM 113 or the HDD 114 and expanded in the RAM 112.

First, as shown in FIG. 3A, the CPU 111 sets a scan image path 3000 that defines the order of image processing for scanning and the order of image regions (S751).
Subsequently, the CPU 111 sets various parameters for performing the image processing described in S3001 to S3003 of FIG. 3A in the image processing unit 118 (S752).
Subsequently, the CPU 111 calculates the resources to be secured for each of the first image memory area 121 and the second image memory area 122 based on the various parameters set in S752 (S753). The resources to be secured for each of the first image memory area 121 and the second image memory area 122 are determined by the data size of the image data generated by reading the original. The data size of the image data generated by reading the document depends on the settings such as color, monochrome, reading resolution, and size of the reading document.
Subsequently, the CPU 111 secures resources for each of the first image memory area 121 and the second image memory area 122 based on the result calculated in the process of S753 (S754).

Here, securing and releasing an area for storing data in the image memory 120 will be described with reference to the schematic diagrams shown in FIGS. 8 and 10.

First, memory control in scan processing will be described with reference to the schematic diagram shown in FIG.

FIG. 8A shows a state in which the respective resources of the first image memory area 121 and the second image memory area 122 are secured in the image memory 120 by the processing of S754.

The first image memory area 121 is an area specified by an address “0x20000000”, for example. If the size of the low-compression image data to be stored in the image memory 120 is 133 MBytes, an area for 133 MBytes from the address “0x20000000” is secured.

The second image memory area 122 is, for example, an area specified by the address “0x70000000”. If the size of the code image data to be stored in the image memory 120 is 25 MByte, an area for 25 MByte from the address “0x70000000” is secured.

Description will be returned to the flowchart shown in FIG.

After executing the processing of S754, the CPU 111 outputs a command (corresponding to the command 1106) instructing the scanner unit 130 to read the document (S755). Then, the scanner unit 130 reads the document in response to receiving the reading instruction from the CPU 111 (S755). Then, upon receiving the command 1105, the CPU 111 advances the processing to S756. Note that the controller unit 110 receives the command 1105 and determines that the pulling in of the original 32 has started.

Subsequently, the CPU 111 waits for a video input start signal (corresponding to the interrupt 1107) (S756). The video input start signal is a hardware interrupt signal input from the scanner unit 130 to the image processing unit 118 via the device I/F 116. A video signal of a scan image is started to be input from the scanner unit 130 using this interrupt signal as a trigger.

When the CPU 111 determines that the video input start signal is input based on the notification of the interrupt 1107 (S756: Yes), the process proceeds to S757. On the other hand, when determining that the video input start signal is not input (S756: No), the CPU 111 repeats the processing of S756 until the interrupt 1107 is notified (that is, until the video input start signal is input). ..
Subsequently, the CPU 111 executes a process of converting the video signal into low compression image data via the image processing unit 118 (S757).
Subsequently, the CPU 111 writes the low-compression image data generated by the process of S757 in the first image memory area 121 (S758).
Subsequently, the CPU 111 determines whether or not the conversion processing executed in S757 is completed (S759). When the CPU 111 determines that the conversion process is completed (S759: Yes), the process proceeds to S760. On the other hand, when the CPU 111 determines that the conversion process is not completed (S759: No), the process returns to S757.
Subsequently, the CPU 111 executes a process of compressing the low compression image data stored in the first image memory area 121 via the compression/expansion unit 119 (S760).
Subsequently, the CPU 111 writes the code image data generated in S760 into the second image memory area 122 (S761).
Subsequently, the CPU 111 determines whether or not the compression processing executed in S760 is completed (S762). When the CPU 111 determines that the compression process is completed (S762: Yes), the process proceeds to S763. On the other hand, when the CPU 111 determines that the compression processing is not completed (S762: No), the CPU 111 returns the processing to S760.
Subsequently, the CPU 111 releases the resources of the first image memory area 121 secured in S754 (S763). The resources of the first image memory area 121 are released when the command output by the CPU 111 (the command for releasing the resources of the image memory 120) is received. In other words, the resource of the first image memory area 121 is not released until the command (command for releasing the resource of the image memory 120) output by the CPU 111 is received. It should be noted that a modification may be made in which the resources of the first image memory area 121 are released in response to the command (command for releasing the resources of the image memory 120) output by the CPU 111.

Here, the description returns to the schematic diagram shown in FIG.

FIG. 8B shows a state in which only the resources of the second image memory area 122 are secured in the image memory 120 and the resources of the first image memory area 121 are released from the image memory 120 by the processing of S763. Shows. As a result, for example, the first image memory area 121 designated by the address “0x20000000” can be assigned the resource of the image memory 120 for the scanning process of another page. Description will be returned to the flowchart shown in FIG.

After executing the processing of S763, the CPU 111 executes the processing of storing the code image data stored in the second image memory area 122 in the HDD 114 (S764).

Subsequently, the CPU 111 writes the code image data output from the second image memory area 122 into the HDD 114 (S765).

Subsequently, the CPU 111 determines whether or not the storage process executed in S764 is completed (S766). When the CPU 111 determines that the storage process is completed (S766: Yes), the process proceeds to S767. On the other hand, when the CPU 111 determines that the storage process is not completed (S766: No), the process returns to S764.

Subsequently, the CPU 111 releases the resources of the second image memory area 122 secured in S754 (S767). The resources of the second image memory area 122 are released when the command output by the CPU 111 (the command for releasing the resources of the image memory 120) is received. In other words, the resource of the second image memory area 122 is not released until the command (command for releasing the resource of the image memory 120) output by the CPU 111 is received. It should be noted that a modification in which the resources of the second image memory area 122 are released in response to the command (command for releasing the resources of the image memory 120) output by the CPU 111 may be used.

Subsequently, the CPU 111 waits for a video input end signal output from the image processing unit 118 (S768). The video input end signal is a hardware interrupt signal internally generated by the image processing unit 118 based on the parameter set in S752.

When the CPU 111 determines that the video input end signal is input (S768: Yes), the process proceeds to S769. On the other hand, when the CPU 111 determines that the video input end signal is not input (S768: No), the process of S768 is repeated until the video input signal is input.

Subsequently, the CPU 111 releases the resources of the image processing unit 118 used for the above-described scan processing (S769).

Subsequently, the CPU 111 determines whether or not there is a next page (S770). The next page is the manuscript of the second and subsequent pages. For example, when there is a page (original) to be scanned by the scanner unit 130, the CPU 111 determines that there is a next page (S770: Yes), and returns the process to S752. On the other hand, when determining that there is no next page (S770: No), the CPU 111 ends the series of processes (S750) related to the scan process.

Note that, in S763 described above, the case where the CPU 111 releases the resources of the first image memory area 121 in accordance with the completion of the compression processing executed in S760 has been described, but the present invention is not limited to this.

The CPU 111 does not release the resource of the first image memory area 121 even after the compression processing executed in S760 is completed, and the first page is read according to the document of the next page being read and the image data is generated. The resources of the image memory area 121 may be released. That is, the CPU 111 does not have to release the resources of the first image memory area 121 reserved for the previous page until it is determined that the video input start signal for the next page has been input.

Further, in S767 described above, the case where the CPU 111 releases the resource of the second image memory area 122 in accordance with the completion of the storage processing executed in S764 has been described, but the present invention is not limited to this.

The CPU 111 does not release the resources of the second image memory area 122 even if the compression processing executed in S764 is completed, and the second page is read in accordance with the fact that the original of the next page is read and the image data is generated. The resources of the image memory area 122 may be released. That is, the CPU 111 does not have to release the resources of the second image memory area 122 reserved for the previous page until it is determined that the video input start signal for the next page has been input.

Alternatively, the CPU 111 reserves the image memory 120 for the previous page (the first image memory area 121 and the second image memory area 121) at the timing of securing the resources of the image memory 120 for the next page. 122) resources may be released.

Next, in the MFP 103 according to the first exemplary embodiment, a series of processes in which the control unit of the scanner unit 130 executes the scan process of the copy job will be described with reference to the flowchart shown in FIG. This processing is performed by the CPU of the control unit of the scanner unit 130 reading the ROM of the scanner unit 130 and executing the control program loaded in the RAM of the scanner unit 130.

First, the CPU of the control unit of the scanner unit 130 waits for a preparation request (corresponding to the command 1102) for pulling in the original 32 (S1201). The CPU of the control unit of the scanner unit 130 determines that the preparation request for pulling in the document 32 is notified based on the reception of the command 1102 (S1201: Yes), and advances the processing to S1202. On the other hand, the CPU of the control unit of the scanner unit 130 repeats the processing of S1201 until receiving the command 1102.

Subsequently, the CPU of the control unit of the scanner unit 130 executes the start processing of the scanner unit 130 (S1202).

Subsequently, the CPU of the control unit of the scanner unit 130 waits for a start request (corresponding to the command 1104) for pulling in the original 32 (S1203). The CPU of the control unit of the scanner unit 130 determines that the start request for pulling in the original 32 is notified based on the reception of the command 1104 (S1203: Yes), and advances the processing to S1204. On the other hand, the CPU of the control unit of the scanner unit 130 repeats the processing of S1203 until receiving the command 1104.

Subsequently, the CPU of the control unit of the scanner unit 130 starts pulling in the original 32 placed on the original tray 30 (S1204). At this time, the CPU of the control unit of the scanner unit 130 outputs the command 1105, and the CPU 111 of the controller unit 110 receives the command 1105. As a result, pulling in of the original 32 is started.

Subsequently, the CPU of the control unit of the scanner unit 130 determines whether or not there is a scan video request from the controller unit 110 (S1205). Based on the command 1106 being received, the CPU of the control unit of the scanner unit 130 determines that there is a request to input the video signal of the scanned image from the scanner unit 130 (S1205: Yes), and advances the processing to S1206. .. On the other hand, the CPU of the control unit of the scanner unit 130 repeats the processing of S1205 until receiving the command 1106.

Subsequently, the CPU of the control unit of the scanner unit 130 outputs an interrupt signal indicating video start (corresponding to the interrupt 1107) to the controller unit 110 (S1206). As a result, the CPU 111 determines YES in S756 described above with reference to FIG.

Subsequently, the CPU of the control unit of the scanner unit 130 determines whether or not the video signal of the scan image is finished (S1207). When the CPU of the control unit of the scanner unit 130 determines that the video signal of the scanned image is finished (S1207: Yes), the process proceeds to S1208. On the other hand, when the CPU of the control unit of the scanner unit 130 determines that the video signal of the scan image has not ended (S1207: No), the process of S1207 is repeated until the video signal of the scan image ends.

The CPU of the control unit of the scanner unit 130 outputs an interrupt signal indicating the end of the video signal of the scan image to the controller unit 110 (S1208), and then determines whether or not there is a next page (S1209). The next page is the original 32 on and after the second page. For example, when the document 32 placed on the document tray 30 remains, the CPU of the control unit of the scanner unit 130 determines that there is a next page (S1209: Yes), and returns the process to S1203. On the other hand, when there is no document 32 placed on the document tray 30, the CPU of the control unit of the scanner unit 130 determines that there is no next page (S1209: No), and executes a predetermined ending process (S1210). ). After the processing of S1210, the control unit of the scanner unit 130 ends the series of processes for executing the scan process of the copy job.

Next, in the MFP 103 according to the first exemplary embodiment, a series of processes (S800) for executing the print process of the copy job that has received the execution instruction will be described with reference to the flowchart shown in FIG. This processing is performed by the CPU 111 executing the control program read from the ROM 113 or the HDD 114 and expanded in the RAM 112.

The printer unit 140 executes the processes of S801 to S804 in response to receiving the command 1110.

First, as shown in FIG. 3B, the CPU 111 sets a print image path 4000 that defines the order of image processing for printing and the order of image areas (S801).
Subsequently, the CPU 111 sets various parameters for performing the image processing described in S4001 to S4003 of FIG. 3B in the image processing unit 118 (S802).
Subsequently, the CPU 111 calculates the resources to be secured for each of the third image memory area 123 and the fourth image memory area 124 based on the various parameters set in S802 (S803). The resources to be secured for each of the third image memory area 123 and the fourth image memory area 124 are determined by the data size of the image data generated by reading the original. The data size of the image data generated by reading the document depends on the settings such as color, monochrome, reading resolution, and size of the reading document.
Subsequently, the CPU 111 secures the resources to be secured for each of the third image memory area 123 and the fourth image memory area 124 based on the result calculated in S803 (S804).

Here, the memory control in the print processing will be described with reference to the schematic diagram shown in FIG.

In FIG. 10A, after the resources of the first image memory area 121 and the second image memory area 122 are secured in the image memory 120, the third image memory area 123 and the fourth image memory area 123 are allocated. This shows a state in which the respective resources of the image memory area 124 are further secured.

The third image memory area 123 is, for example, an area specified by the address “0x80000000”. If the size of the code image data to be stored in the image memory 120 is 25 MByte, an area for 25 MByte from the address “0x80000000” is secured.

The fourth image memory area 124 is an area specified by the address “0x90000000”, for example. If the size of the low-compression image data to be stored in the image memory 120 is 133 MBytes, an area for 133 MBytes from the address “0x90000000” is secured.

The size of the area secured in the image memory 120 is the same in the first image memory area 121 and the fourth image memory area 124, and the second image memory area 122 and the third image memory area are the same size. The size is the same as 123.

Description will be returned to the flowchart shown in FIG.

After executing the processing of S804, the CPU 111 outputs a command (corresponding to the command 1113) instructing printing to the printer unit 140 (S805).
Subsequently, the CPU 111 waits for a video output start signal (corresponding to the interrupt 1114) (S806). The video output start signal is a hardware interrupt signal input from the printer unit 140 to the image processing unit 118 via the device I/F 116.
Subsequently, the CPU 111 determines whether or not the resources of the first image memory area 121 are released (S807). When the CPU 111 determines that the resource has been released (S807: Yes), the process proceeds to S813. On the other hand, when the CPU 111 determines that the resource is not released (S807: No), the CPU 111 advances the process to S808.

When the low-compressed image data of the original of the same page is stored in the first image memory area 121, the CPU 111 determines that the resources of the first image memory area 121 are not released (S807: No). ). On the other hand, when the low-compressed image data of the original of the same page is not stored in the first image memory area 121, the CPU 111 determines that the resources of the first image memory area 121 are released (S807: Yes). ).

Alternatively, when the command for releasing the resource of the image memory 120 is output, the CPU 111 may determine that the resource of the first image memory area 121 is released (S807: Yes). On the other hand, when the command for releasing the resource of the image memory 120 is not output, the CPU 111 may determine that the resource of the first image memory area 121 is not released (S807: No).

First, the processing after S808 will be described.

The CPU 111 uses, as an address for reading the low-compression image data from the image memory 120, an address (d) for referring to the fourth image memory area 124 to an address (d) for referring to the first image memory area 121. Change to a) (S808).

Here, the description returns to the schematic diagram shown in FIG.

FIG. 10B shows a state in which the address “0x90000000” is replaced with the address “0x20000000” as the address for reading the low compression image data from the image memory 120 by the processing of S808. As a result, the CPU 111 executes the low compression image data stored in the area specified by the address “0x20000000” (that is, the first image memory area 121) as preprocessing for outputting the video signal to the printer unit 140. You can read it.

Description will be returned to the flowchart shown in FIG.

After executing the processing of S808, the CPU 111 releases the resources of the third image memory area 123 and the fourth image memory area 124 secured in S804 (S809). Note that the resources of the third image memory area 123 and the fourth image memory area 124 are released in response to the reception of the command (command for releasing the resources of the image memory 120) output by the CPU 111. .. In other words, the resources of the third image memory area 123 and the fourth image memory area 124 are not released until the command output by the CPU 111 (command for releasing the resources of the image memory 120) is received. In the modification, the resources of the third image memory area 123 and the fourth image memory area 124 are released in response to the command (command for releasing the resource of the image memory 120) output by the CPU 111. It may be.

Here, the description returns to the schematic diagram shown in FIG.

In FIG. 10C, the resources of the first image memory area 121 and the second image memory area 122 are secured in the image memory 120, and the third image memory area 123 and the fourth image memory area 124 are shown. Indicates that the resource is released from the image memory 120. As a result, for example, the third image memory area 123 specified by the address “0x80000000” can be assigned the resource of the image memory 120 for the scanning process of another page. Further, for example, the fourth image memory area 124 designated by the address “0x90000000” can be allocated the resource of the image memory 120 for the scanning process of another page.

Description will be returned to the flowchart shown in FIG.

After executing the processing of S809, the CPU 111 executes the processing of converting the low compression image data stored in the first image memory area 121 into a video signal via the image processing unit 118 (S810).

Subsequently, the CPU 111 outputs the video signal generated in the process of S809 to the printer unit 140 (S811).

Subsequently, the CPU 111 determines whether or not the conversion processing executed in S809 is completed (S812). When the CPU 111 determines that the conversion process is completed (S812: Yes), the process proceeds to S830. On the other hand, when the CPU 111 determines that the conversion process is not completed (S812: No), the process returns to S810.

Next, the processing after S813 will be described.

The CPU 111 determines whether the resource of the second image memory area 122 is released (S813). When the CPU 111 determines that the resources of the second image memory area 122 are released (S813: Yes), the process proceeds to S819. On the other hand, when the CPU 111 determines that the resources of the second image memory area 122 are not released (S813: No), the process proceeds to S814.

When the code image data of the original of the same page is stored in the second image memory area 122, the CPU 111 determines that the resources of the second image memory area 122 are not released (S813: No). .. On the other hand, when the coded image data of the original of the same page is not stored in the second image memory area 122, the CPU 111 determines that the resources of the second image memory area 122 are released (S813: Yes). ..

Alternatively, when the command for releasing the resource of the image memory 120 is output, the CPU 111 may determine that the resource of the second image memory area 122 is released (S813: Yes). On the other hand, when the command for releasing the resource of the image memory 120 is not output, the CPU 111 may determine that the resource of the second image memory area 122 is not released (S813: No).

The CPU 111 uses, as an address for reading the code image data from the image memory 120, an address (c) for referring to the third image memory area 123, an address (b) for referring to the second image memory area 122. ) (S814).

Subsequently, the CPU 111 releases the resources of the third image memory area 123 secured in S804 (S815). Note that the resources of the third image memory area 123 are released in response to the reception of the command output by the CPU 111 (command for releasing the resources of the image memory 120). In other words, the resource of the third image memory area 123 is not released until the command (command for releasing the resource of the image memory 120) output by the CPU 111 is received. It should be noted that a modification in which the resources of the third image memory area 123 are released in response to the command (command for releasing the resources of the image memory 120) output by the CPU 111 may be used.

Subsequently, the CPU 111 executes a process of expanding the code image data stored in the second image memory area 121(B) via the compression/expansion unit 119 (S816).

Subsequently, the CPU 111 writes the low-compression image data generated in the process of S816 in the fourth image memory area (S817).

Subsequently, the CPU 111 determines whether or not the decompression processing executed in S815 is completed (S818). When the CPU 111 determines that the decompression process is completed (S818: Yes), it advances the process to S826. On the other hand, when the CPU 111 determines that the decompression process has not been completed (S818: No), the process returns to S816.

Next, the processing after S819 will be described.

The CPU 111 executes a process of reading coded image data from the HDD 114 (S819).
Subsequently, the CPU 111 writes the code image data read in S819 into the third image memory area 123 (S820).
Subsequently, the CPU 111 determines whether or not the read processing executed in S819 is completed (S821). When the CPU 111 determines that the reading process is completed (S821: Yes), the process proceeds to S822. On the other hand, when the CPU 111 determines that the reading process is not completed (S821: No), the process returns to S819.
Subsequently, the CPU 111 executes the process of expanding the code image data stored in the third image memory area 123 via the compression/expansion unit 119 (S822).
Subsequently, the CPU 111 writes the low compression image data generated in S821 into the fourth image memory area 124 (S823).
Subsequently, the CPU 111 determines whether or not the decompression processing executed in S822 is completed (S824). When the CPU 111 determines that the decompression processing is completed (S824: Yes), the processing proceeds to S825. On the other hand, when the CPU 111 determines that the decompression process has not been completed (S824: No), the process returns to S822.
Subsequently, the CPU 111 releases the resources of the third image memory area 124 secured in S804 (S825). Note that the resources of the third image memory area 123 are released in response to the reception of the command output by the CPU 111 (command for releasing the resources of the image memory 120). In other words, the resource of the third image memory area 123 is not released until the command (command for releasing the resource of the image memory 120) output by the CPU 111 is received. It should be noted that a modification in which the resources of the third image memory area 123 are released in response to the command (command for releasing the resources of the image memory 120) output by the CPU 111 may be used.

Next, the processing after S826 will be described.

The CPU 111 executes processing of converting the low compression image data stored in the fourth image memory area 124 into a video signal via the image processing unit 118 (S826).

Subsequently, the CPU 111 outputs the video signal generated in S826 to the printer unit 140 (S827).

Subsequently, the CPU 111 determines whether or not the conversion processing executed in S826 is completed (S828). When the CPU 111 determines that the conversion process is completed (S828: Yes), it releases the resources of the fourth image memory area 124 secured in S804 (S829). The resources of the fourth image memory area 124 are released in response to the reception of the command (command for releasing the resources of the image memory 120) output by the CPU 111. In other words, the resource of the fourth image memory area 124 is not released until the command (command for releasing the resource of the image memory 120) output by the CPU 111 is received. It should be noted that the modification may be a modification in which the resources of the fourth image memory area 124 are released in response to the command (command for releasing the resources of the image memory 120) output by the CPU 111.

Next, the processing after S830 will be described.

The printer unit 140 prints an image on a sheet based on the video signal (that is, image data) output by the process of S811 or S827 (S830).

Subsequently, the CPU 111 waits for a video output end signal output from the image processing unit 118 (S831). The video output end signal is a hardware interrupt signal internally generated by the image processing unit 118 based on the parameter set in S802. When the CPU 111 determines that the video output end signal is input (S831: Yes), the process proceeds to S832. On the other hand, when the CPU 111 determines that the video output end signal is not input (S831: No), the process of S831 is repeated until the video output end signal is input.

Subsequently, the CPU 111 releases the resources of the image processing unit 118 used for the above-described print processing (S832).

Subsequently, the CPU 111 determines whether or not there is a next page (S833). For example, when there are pages to be printed by the printer unit 140, the CPU 111 determines that there is a next page (S833: Yes), and returns the process to S802. On the other hand, when determining that there is no next page (S833: No), the CPU 111 ends the series of processes (S800) related to the print process.

In the first embodiment, in the MFP 103, the speed at which the image data is written to the image memory 120 by reading the document is faster than the speed at which the image data is read from the image memory 120 for printing. The case of executing the copy has been described.

In the control example described with reference to FIG. 9, when copying a document of a plurality of pages, the image data stored in the image memory 120 is read until printing based on the image data stored in the image memory 120 cannot be executed. Printing based on the read image data was executed. Further, in the control example described with reference to FIG. 9, when the printing based on the image data stored in the image memory 120 cannot be executed at the time of executing the copy of the document of a plurality of pages, the image data stored in the HDD 114 is read out, Printing based on the read image data was executed.

As a result, even when the speed at which the image data is written to the image memory 120 by reading the document is faster than the speed at which the image data is read from the image memory 120 for printing, an overflow occurs in the image memory 120. It can be prevented from occurring.

As described above, in the first embodiment to which the present invention is applied, the printing apparatus stores the image data generated by reading a plurality of originals in the first storage unit (for example, the image memory 120). Subsequently, the printing device stores the image data read from the first storage unit in the second storage unit (for example, the HDD 114). Then, the printing apparatus executes printing based on the image data stored in any one of the first storage unit and the second storage unit.

The printing apparatus executes printing based on the image data of the document stored in the first storage unit until it cannot perform printing based on the image data of the document stored in the first storage unit. On the other hand, when the printing apparatus cannot execute the printing based on the image data of the document stored in the first storage unit, the printing apparatus executes the printing based on the image data of the document stored in the second storage unit. By such control, an overflow does not occur in the storage unit (storage unit) such as the image memory 120 when the copy of a document of a plurality of pages is executed. Further, it is possible to shorten the processing time for reading a document of a plurality of pages and executing printing based on the image data generated by reading the document of a plurality of pages.

[Second Embodiment]
In the first embodiment, the resources of the first image memory area 121 and the second image memory area 122 are reserved for the scan processing, and the third image memory area 123 and the fourth image memory area 123 are reserved for the print processing. The example in which the resources of the image memory area 124 are secured has been described.

Also in the second embodiment, the resources of the first image memory area 121 and the second image memory area 122 are secured for the scan processing. On the other hand, in the second embodiment, an example will be described in which the resources of the third image memory area 123 are secured for print processing, but the resources of the fourth image memory area 124 are not secured.

Note that in the MFP 103 according to the second embodiment, as in the first embodiment, the image data is written in the image memory 120 by reading the original document rather than the speed at which the image data is read from the image memory 120 for printing. Assume a case in which the speed is higher.

In the control example according to the second embodiment, a part of the processing is different from the control example according to the first embodiment described above. Therefore, the processing different from that of the first embodiment will be mainly described with reference to FIGS. 13 and 14. The same processes as those described in the first embodiment are designated by the same step numbers, and detailed description thereof will be omitted.

First, a series of processes (S4001, S9002, and S9003) after data is read from the image memory 120 or the HDD 114 until a video signal is output to the printer unit 140 will be described with reference to the schematic diagram shown in FIG. explain.

The CPU 111 sets a print image path 9000 shown in FIG. 13, which defines the order of image processing for printing and the order of image areas. After setting the print image path 9000, the CPU 111 executes the processing of S4001, S9002, and S9003. The CPU 111 sets various parameters for the image processing unit 118 to perform the image processing described in S4001, S9002, and S9003.

In step S9002, the compression/decompression unit 119 decompresses the code image data stored in the third image memory area 123 to generate low-compression image data. At this time, the generated low compression image data is not stored in the fourth image memory area 124. This is because, in the second embodiment, the resources of the third image memory area 123 are secured but the resources of the fourth image memory area 124 are not secured at the start of the printing process.

In step S9003, the low compression image data generated in step S9002 is converted into a video signal and output to the printer unit 140. That is, in the second embodiment, the process of converting the low-compression image data generated by decompressing the code image data into a video signal is performed without using the image memory 120.

Next, in the MFP 103 according to the second embodiment, the order of the processing when the scan processing and the print processing are operated in parallel during the operation of the copy processing is shown in FIGS. 14A and 14B. Each will be described with reference to the drawings.

Further, in the copy processing operation according to the second embodiment, the address (c) for referring to the third image memory area 123 is replaced with the address (a) for referring to the first image memory area 121. It is set to be possible.

Further, in the operation of the copy processing in the second embodiment, the address (c) for referring to the third image memory area 123 is replaced with the address (b) for referring to the second image memory area 122. It is set to be possible.

FIG. 14A shows the processing content of the copy processing operation when the print processing is started in the phase of the scan processing described in FIG. 4A. In the phase of this copy processing operation, the address (c) for referencing the third image memory area 123 is replaced with the address (a) for referencing the first image memory area 121. Be done.

In the process of S9003, the CPU 111 reads out the low-compression image data stored in the first image memory area 121, and then sets the parameters for the decompression process according to the compression rate of the read low-compression image data as an image. Set in the processing unit 118. Then, the CPU 111 decompresses the low compression image data stored in the first image memory area 121 via the compression/decompression unit 119 based on the parameters for the decompression processing. Then, the CPU 111 converts the low-compression image data of the new compression rate generated by this decompression processing into a video signal, and then outputs the converted video signal to the printer unit 140.

That is, in the copy processing operation of FIG. 14A, since the copy processing operation is performed in the processing of S3001 and S9003, the processing of S4001 described in FIG. 3A can be omitted. Therefore, it is possible to shorten the time until the printing of the image on the sheet is started.

FIG. 14B shows the processing content of the copy processing operation when the print processing is started in the phase of the scan processing described in FIG. 4C. In the phase of this copy processing operation, the processing of S3001 and S3002 is completed, and the processing of S3003 is being executed. That is, in this phase, the resource of the second image memory area 122 is being used for the processing of S3003. In other words, the resources of the second image memory area 122 are not yet released in this phase. On the other hand, in this phase, the resources of the first image memory area 121 are in a released state. Therefore, in the copy processing operation of FIG. 14B, the address (c) for referencing the third image memory area 123 refers to the address (b) for referencing the second image memory area 122. Will be replaced with the address for

In the processing of S9002, the CPU 111 reads the code image data stored in the second image memory area 122, and then decompresses the code compressed image data via the compression/decompression unit 119. Then, in the processing of S9003, the CPU 111 converts the low compression image data generated in the processing of S9002 into a video signal, and then outputs the converted video signal to the printer unit 140.

That is, in the copy processing operation of FIG. 14B, since the copy processing operation is performed in the processing of S3001, S3002, S9002, and S9003, the processing of S4001 described in FIG. 3A can be omitted. . Therefore, it is possible to shorten the time until the printing of the image on the sheet is started.

In the second embodiment, in the MFP 103, the speed at which the image data is written to the image memory 120 by reading the document is faster than the speed at which the image data is read from the image memory 120 for printing. The case of executing the copy has been described.

In the control example described with reference to FIG. 14, at the time of copying a document of a plurality of pages, the image data stored in the image memory 120 is read until the printing based on the image data stored in the image memory 120 cannot be executed. Printing based on the read image data was executed. Further, in the control example described with reference to FIG. 5B, when the printing based on the image data stored in the image memory 120 cannot be executed at the time of executing the copy of the document of a plurality of pages, the image data stored in the HDD 114 is deleted. Reading was performed and printing was performed based on the read image data.

As a result, even when the speed at which the image data is written to the image memory 120 by reading the document is faster than the speed at which the image data is read from the image memory 120 for printing, an overflow occurs in the image memory 120. It can be prevented from occurring.

In the second embodiment to which the present invention is applied, the resource of the third image memory area 123 is reserved for print processing, but the resource of the fourth image memory area 124 is not reserved. That is, in the second embodiment to which the present invention is applied, the case in which the process of converting the low-compression image data generated by decompressing the code image data into a video signal is performed without passing through the image memory 120 has been described. ..

By such control, an overflow does not occur in the storage unit (storage unit) such as the image memory 120 when the copy of a document of a plurality of pages is executed. Further, it is possible to shorten the processing time for reading a document of a plurality of pages and executing printing based on the image data generated by reading the document of a plurality of pages.

(Other embodiments)
The present invention is not limited to the above-described embodiments, and various modifications (including organic combinations of the embodiments) are possible based on the gist of the present invention, which are excluded from the scope of the present invention. is not.

For example, in the present embodiment, the CPU 111 of the controller unit 110 of the MFP 103 is the main body of the above various controls, but the present invention is not limited to this. A part or all of the above various controls may be configured to be executable by a print control device such as an external controller that is provided in a separate housing from the MFP 103.

The present invention supplies a program that implements one or more functions of the above-described embodiments to a system or apparatus via a network or a storage medium, and one or more processors in a computer of the system or apparatus read and execute the program. It can also be realized by the processing. It can also be realized by a circuit (for example, ASIC) that realizes one or more functions.

103 MFP
110 controller section 111 CPU
114 HDD
120 image memory 130 scanner unit 140 printer unit

Claims (12)

Reading means for reading a document, printing means for executing printing based on image data, first storage means for storing image data of the document read by the reading means, and read from the first storage means A second storage unit for storing the image data that has been read. When the reading unit reads a document of a plurality of pages and the printing unit prints, the reading process of one page and the printing process of the one page are performed. It is possible to operate in parallel, and the speed at which the image data of the document read by the reading unit is stored in the first storage unit is read out from the first storage unit for printing. A printing device that is faster than speed,
The first storage unit is the image data of the document read by the reading unit, and the image data not printed by the printing unit is stored in the second storage unit and then the printing unit. The image data of the original document newly read by the reading means is stored in place of the image data which is not printed by
When the image data to be printed can be read from the first storage unit, the printing unit executes printing based on the image data to be printed read from the first storage unit, and the printing unit When an error for interrupting the execution of printing has not occurred and the image data to be printed cannot be read from the first storage unit, the image data corresponding to the image data to be printed is: A printing apparatus, which executes printing based on the image data read from the second storage unit. The first storage unit releases the resource in which the image data of the document read by the reading unit and the image data not printed by the printing unit is stored, and is newly read by the reading unit. The printing apparatus according to claim 1, wherein the image data of the original document is stored in the resource. 3. The reading unit newly reads the original while the printing based on the image data read from the first storage unit is being executed by the printing unit. Printing device. Further comprising a determination unit that determines whether the image data to be printed can be read from the first storage unit,
When the determination unit determines that the image data to be printed can be read from the first storage unit, the printing unit performs printing based on the image data to be printed read from the first storage unit. And the case where the error that interrupts printing by the printing unit does not occur and the determination unit determines that the image data to be printed cannot be read from the first storage unit, The image data corresponding to the image data to be printed, wherein the printing is executed based on the image data read from the second storage means. Printing device. When the image data to be printed is stored in the first storage unit, the determination unit determines that the image data to be printed can be read from the first storage unit, and the image data to be printed is The printing apparatus according to claim 4, wherein when the image data to be printed is not stored in the first storage unit, it is determined that the image data to be printed cannot be read from the first storage unit. A first resource for storing the image data of the document read by the reading means,
And a securing means for securing from the first storage means any one of second resources for storing image data of the original document newly read by the reading means,
Output means for outputting a command for releasing the first resource secured by the securing means;
Receiving means for receiving the command output by the output means,
Further has
The determination unit determines that the image data to be printed cannot be read from the first storage unit based on the reception of the command by the reception unit. Printing device. A first resource for storing the image data of the document read by the reading means,
And a securing means for securing from the first storage means any one of second resources for storing image data of the original document newly read by the reading means,
Output means for outputting a command for releasing the first resource secured by the securing means;
Further has
The determination unit determines that the image data to be printed cannot be read from the first storage unit based on the output of the command by the output unit. Printing device. The first storage unit stores image data compressed at a first compression rate,
The said 2nd memory|storage means memorize|stores the image data compressed by the 2nd compression rate with a higher compression rate than the said 1st compression rate. Printing device. The first storage means stores uncompressed image data,
The printing device according to any one of claims 1 to 7, wherein the second storage unit stores compressed image data. Reading means for reading a document, printing means for executing printing based on image data, first storage means for storing image data of the document read by the reading means, and read from the first storage means A second storage unit for storing the image data that has been read. When the reading unit reads a document of a plurality of pages and the printing unit prints, the reading process of one page and the printing process of the one page are performed. It is possible to operate in parallel, and the speed at which the image data of the document read by the reading unit is stored in the first storage unit is read out from the first storage unit for printing. A method of controlling a printing device that is faster than speed,
The first storage unit is the image data of the document read by the reading unit, and the image data not printed by the printing unit is stored in the second storage unit, and then the printing is performed. Storing the image data of the original document newly read by the reading unit instead of the image data that has not been printed by the unit,
When the image data to be printed can be read from the first storage unit, the printing unit executes printing based on the image data to be printed read from the first storage unit, and the printing unit When an error for interrupting the execution of printing has not occurred and the image data to be printed cannot be read from the first storage unit, the image data corresponding to the image data to be printed is: A method of controlling a printing apparatus, wherein printing is performed based on image data read from the second storage unit. A program for causing a computer to execute the method for controlling a printing apparatus according to claim 10. A computer-readable storage medium that stores the program according to claim 11.

Images