JP2001245121A - Image processor and its control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image processor and its control method having improved efficiency in throughput and memory utilization regarding data processing by making the memory simultaneously accessible to plural different kinds of data. SOLUTION: A control unit (controller section) 110 causes simultaneous conducting of transfer to the memory of a specified amount of image data output from the scanner unit 210 that has read the image and converted into the image data, transfer of the image data stored in the memory to CODEC for image data compression, and transfer of the image data stored in the memory to the liquid crystal display of an operation unit 150. The transfer volume of the image data to CODEC is calculated, based on the data transfer speed to memory and the CODEC processing speed. The control unit executes a command to start CODEC when the image data is transferred and gives the command to show the data on the liquid crystal display of the operation unit, when a prescribed amount of image data is transferred to memory.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001] 1. Field of the Invention [0002] The present invention relates to an image processing apparatus for controlling an image input device such as a scanner and an image output device such as a printer to process and control image data, and a control method thereof.

2. Description of the Related Art Conventionally, in a device for controlling an image input / output device, when image data is handled via a memory, a technique for saving the memory capacity and optimizing the processing has been devised. Particularly, in an electrophotographic image input / output device, since the processing on the image input / output device side is performed at a constant speed, it is necessary to guarantee a higher data transfer speed on the device side. For example, when an image input from a scanner is compressed using a compression / decompression device (hereinafter referred to as “CODEC”) and stored in a memory, the input image data is read into a ring buffer while CODEC processing is performed at the same time. (That is, the memory for the entire page is not required), and the processing speed is improved by overlapping the input processing and the compression processing. In order to enable such an operation, the DMA operation for image input and the DMA operation for compression can be performed simultaneously in good cooperation, and a processing speed that can follow the data input operation from the scanner can be guaranteed. Techniques have been devised.

However, in the above conventional example, the mechanism for performing simultaneous operations is often limited to fixed use conditions, and as a result, lacks flexibility and expandability. There were many. Further, there is an example in which the speed is guaranteed by limiting the type of simultaneous operation to two processes (input of image data from a scanner and data compression, or input of image data from a scanner and output to a printer).
In many cases, access to the same data area by the CPU during the MA operation is prohibited. For this reason, if an attempt is made to perform an operation with more combinations, the throughput of the data processing will decrease, and during that time, the image must be held as bitmap data, and the memory usage efficiency will decrease. was there. On the other hand, a control device that eliminates such hardware restrictions has been proposed (Japanese Patent Laid-Open No. 11-45225). In this device, processes that can operate simultaneously can be freely combined. But it has enough operating bandwidth to guarantee the data transfer rate. However, the document only describes that processes that can be simultaneously operated by hardware can be freely combined, but does not describe an application example in which, for example, three types of processes are simultaneously operated. SUMMARY An advantage of some aspects of the invention is to solve the above problem by controlling simultaneous access to a memory in a plurality of types of processing.
It is an object of the present invention to provide an image processing apparatus and a control method thereof, in which data processing throughput and memory use efficiency are improved.

To achieve the above object, an image processing apparatus according to the present invention comprises an image input means for reading an image and converting the image into image data; and an image input means for storing the image data in a storage means for storing the image data. First transfer means for transferring a predetermined amount of image data input by the means, second transfer means for transferring the image data stored in the storage means to first processing means for processing the image data, A third transfer unit that transfers the image data stored in the storage unit to a second processing unit that processes the image data, a data transfer speed by the first transfer unit, and a process by the first processing unit Transfer amount calculating means for calculating a transfer amount of image data by the second transfer means based on the speed; and image data of the transfer amount calculated by the transfer amount calculating means, The first processing means is controlled so that the processing of the image data is started when the image data is transferred, and when a predetermined amount of image data is transferred by the third transfer means, the image data is processed. Control means for controlling the second processing means so as to start processing. In order to achieve the above object, a control method of an image processing apparatus according to the present invention includes a first method of reading an image and transferring a predetermined amount of image data input by an image input means for converting the image data to a storage means. Transfer step, a second transfer step of transferring the image data stored in the storage means to the first processing means for processing the image data, and a second processing means for processing the image data to the storage means A third transfer step of transferring the stored image data, a data transfer rate of the first transfer step, and a processing rate of the image data of the second transfer step based on the processing speed of the first processing means. A transfer amount calculating step of calculating a transfer amount; and a step of starting the processing of the image data when image data of the transfer amount calculated in the transfer amount calculating step is transferred in a second transfer step. And controlling the second processing means so as to start processing the image data when a predetermined amount of image data in the first transfer step is transferred in the third transfer step. And a process.

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
The embodiment according to will be described in detail. FIG. 1 shows this embodiment.
1 shows an overall configuration of an image input / output system 100 in a state.
FIG. In the figure, reference numeral 200 denotes a leader section (image input section).
Device), which reads the original image optically and
To data. The reader unit 200 reads the original
Scanner unit 210 that has the function of
With the document feeding unit 250 that has the function of conveying
Be composed. Reference numeral 300 denotes a printer unit (image output device).
Transports the recording paper and visualizes the image data on the recording paper.
The image is printed and discharged outside the apparatus. Printer unit 30
0 is a paper feed unit 31 having a plurality of types of recording paper cassettes
0 and has the function of transferring and fixing image data on recording paper.
The marking unit 320 and the printed recording paper
Paper output unit that has the function of
And a knit 330. 110 is a control device (con
A reader unit 200 and a printer unit
300 are electrically connected to each other and 400 networks (L
AN) through a plurality of host computers (PCs) 40
1,402. Also, the control device 110
Reads the image data of the document by controlling the reader unit 200
Control the printer unit 300 to record image data on recording paper
Provide a copy function to output to. Furthermore, leader part 2
Convert image data read from 00 to code data
And the host computer 4 via the network 400
01 (402) and the host function
From the computer 401 (402) via the network 400
To convert the received code data into image data,
And a printer function for outputting to the printer 300. 1
Reference numeral 50 denotes an operation unit which is connected to the control device 110 and
It consists of a touch panel and operates the image input / output system.
To provide a user I / F. Figure 2 shows the leader section
FIG. 2 is a cross-sectional view illustrating a structure of a printer 200 and a printer unit 300.
You. The document feeding unit 250 of the reader unit 200
Are fed onto the platen glass 211 one by one in the order of the top,
After the original reading operation is completed, the platen glass 211
The original is discharged. Original is platen glass 21
1 is turned on, the lamp 212 is turned on, and
Scanning of the original by starting the movement of the scanning unit 213
I do. The reflected light from the original at this time is reflected by mirrors 214 and 2.
15, 216 and lens 217
(Hereinafter referred to as “CCD”) 218. this
Thus, the scanned original image is read by the CCD 218.
Be taken away. To image data output from the CCD 218
After the predetermined processing is performed, the data is transferred to the control device 110.
Is done. On the other hand, the laser driver 32 of the printer unit 300
Reference numeral 1 denotes a device for driving the laser emitting unit 322, and a control device.
Laser light corresponding to the image data output from the device 110
The laser emitting section 322 emits light. This laser light is exposed
The photosensitive drum 323 is irradiated with a laser beam
A latent image corresponding to the light is formed. Here, this photosensitive drum
A developer is applied to the portion of the latent image 323 by the developing device 324.
Is attached. Then, the timing synchronized with the start of laser beam irradiation
Imming, from either cassette 311 or 312
The recording paper is fed and transported to the transfer unit 325, where the photosensitive drum 3
The developer adhered to 23 is transferred to recording paper. Of developer
The loaded recording paper is conveyed to the fixing unit 326, and the fixing unit 326
Due to the heat and pressure of the developer, the developer is fixed on the recording paper. Fixing section
The recording paper that has passed through 326 is discharged by discharge rollers 327.
Output unit 330 bundles the discharged recording sheets.
To sort the recording paper,
Do iple. When double-sided recording is set
Transports the recording paper to the discharge roller 327 and then discharges it.
The rotation direction of the output roller 327 is reversed, and the flapper 328 is rotated.
To the re-feed conveyance path 329. And re-feed
The recording paper guided to the feed path 329 is rotated at the timing described above.
The paper is fed to the photographing unit 325. <Description of Control Device 110> Next, the image input / output system 1
Function of control device (controller unit) 110 at 00
Will be described. FIG. 3 shows a control device according to the present embodiment.
FIG. 2 is a block diagram showing a configuration of a device 110. Smell
Reference numeral 111 denotes a main controller, which is mainly a CPU 1
12, a bus controller 113, and various I / F controllers
And a roller circuit. CPU 112 and bus controller
The controller 113 controls the operation of the entire control device 110.
The CPU 112 reads from the ROM 114 to the ROM
Operate based on the program read via I / F115
Make. Also, the PDL received from the host computer
(Page description language) Interpret code data
The operation to expand to image data is also described in this program
And processed by software. Basco
The controller 113 controls data input / output from each I / F.
Arbitration and DMA data during bus contention.
Data transfer is controlled. Reference numeral 116 denotes a DRAM, and DR
AMI / F117 and main controller 111
Work that is connected and operates for the CPU 112 to operate.
Area or an area for storing image data.
Used. 121 is a network controller,
Connected to main controller 111 by I / F123
Connected to the external network via the 122 connector.
Continued. Generally, Ethernet
Is given. 124 is for connecting an expansion board
Expansion connector, connected to 125 general-purpose high-speed buses
You. The general-purpose high-speed bus 125 is generally a PCI bus.
Is raised. Reference numeral 126 denotes an I / O control unit, which is a leader
CPU and control commands of the printer unit 200 and the printer unit 300
Asynchronous Serial Communication Controller for Transmitting and Receiving Data
127 are equipped with two channels, and an I / O bus 128 is provided.
Connected to the external I / F circuits 140 and 145
You. Further, it is connected to a general-purpose high-speed bus 125. 13
Reference numeral 2 denotes a panel I / F, which is provided to the LCD controller 131.
Connected to display on the LCD screen on the operation unit 150
I / F and input of hard key and touch panel key
And a key input I / F 130. here
The operation unit 150 is attached on the liquid crystal display unit and the liquid crystal display unit.
Touch panel input device and multiple hard keys
And input by touch panel or hard key
The signal is sent to the CPU 11 via the panel I / F 132 described above.
2 and the liquid crystal display is sent from the panel I / F 132.
The received image data is displayed. The liquid crystal display has a book
Function display and image data in operation of the image forming apparatus
indicate. 133 is a real-time clock module
Yes, update / save the date and time managed in the device
Battery with 134 backup batteries.
Has been up. 161 is an E-IDE connector.
For connecting an external storage device (not shown).
You. In addition, a hard disk is connected through the connector 161.
And a CD-ROM drive to connect programs and image data.
Data can be written. 142 and 147
Connectors, a reader unit 200 and a printer, respectively.
Unit 300, and a synchronous serial I / F 14
3,148 and video I / F 144,149
It is. Reference numeral 140 denotes a scanner I / F, and a connector 142
Is connected to the reader unit 200 through the scanner bus 1
41 is connected to the main controller 111.
You. Then, the image received from the leader unit 200 is
Optimal binarization according to the content of processing in the subsequent process
And has the function of changing the magnification to main scanning and sub scanning.
Based on the video control signal sent from the reader unit 200
And outputs the generated control signal to the scanner bus 141.
It also has functions. It should be noted that the scanner bus 141 to the DRAM 1
16 is transferred by the bus controller 113.
Controlled. Reference numeral 145 denotes a printer I / F.
Connected to the printer unit 300 via the printer
Tabbus 146 connects to main controller 111
Have been. Then, from the main controller 111,
Printer that performs smoothing processing on the input image data
A printer unit 300
Control signal generated based on the video control signal sent from
It also has a function of outputting a signal to the printer bus 146. still,
Raster image data developed on DRAM 116
Is transferred to the printer 300 by the bus controller 11.
3, the printer bus 146, the video I /
DMA transfer to the printer unit 300 via F149.
It is. <Description of Main Controller 111> Next, the control device 1
10 will be described.
You. FIG. 4 illustrates a main controller 1 according to the present embodiment.
It is a block diagram which shows the structure of No.11. As shown
The processor core (CPUU) 401 is a 64-bit processor.
System bus via the processor bus (SCBus)
Bridge (SBB) 402 is connected. SBB402
Is a 4 × 4 64-bit crossbar switch,
SDR equipped with cache memory in addition to
Memory controller (MC) 4 for controlling AM and ROM
03 and a dedicated local bus (MCBus)
G bus which is a graphic bus
404, a B bus (BBus) 405 which is an IO bus,
Connected to a total of four buses. In addition, SBB
Reference numeral 402 designates a simultaneous operation between these four modules as much as possible.
It is designed to ensure parallel connection. Also,
Data compression / decompression unit (codec) 418, codec I / F
Connected through. G bus 404 is G bus arbi
(GBA) 406 is coordinated and controlled.
Scanner / printer connector to connect to
Connected to a controller (SPC) 408. In addition, B bus
405 is coordinated by B bus arbiter (BBA) 407
Power management unit in addition to SPC408
(PMU) 409, interrupt controller (IC)
410, Serial interface controller using UART
Troller (SIC) 411, USB controller (US
BC) 412, parallel input using IEEE1284
Interface controller (PIC) 413, Ethernet
LAN controller (LANC) 414 using L
CD panel, key, general-purpose input / output controller (MIS
C) 415, PCI bus interface (PCIC) 4
16 is also connected. Also, the MISC 415 has
An operation panel 417 including a display panel and a keyboard is connected.
Continued. Here, each unit of the main controller 111 is
The details will be described in more detail. <Interrupt controller 410> Interrupt controller
The controller 410 is connected to the B bus 405 and
Each function block inside the controller chip and outside the chip
These interrupts are integrated and the processor core 401
6-level external interrupt and non-mass porting
Redistribute to the Cable Interrupt (NMI). Each machine
The function block is a power management unit 409, a serial
Interface controller 411, USB controller
412, parallel interface controller 413,
Ethernet controller 414, general purpose input / output controller
415, PCI bus interface 416, scan
And a printer controller 408. <Memory controller 403> Memory controller 40
3 is a local bus dedicated to the memory controller M
C bus and a synchronous DRAM (SDRA
M), a flash ROM, and a ROM. <System bus bridge 402> The SBB 402
(I / O bus), G bus (graphic bus), SC
Between bus (processor local bus) and MC bus
Multi-channel that provides connection using a crossbar switch
This is a tunnel bidirectional bus bridge. Here,
Switches must establish at least two simultaneous connections.
And high-speed data transfer with high parallelism can be realized. Figure
5 is a block diagram showing the configuration of the system bus bridge 402.
FIG. As shown, the SBB 402 is a B bus 4
Bus interface 2009 for connecting
And a G bus interface for connecting to the G bus 404
To connect with the processor core 401 and the processor core 401.
CPU interface slave port 2002
Memory interface for connecting to the memory controller 403
Face master port 2001 and compression / decompression unit
CODEC bus interface for connecting to
2014, and an address bus.
Dress switch 2003, data connecting data bus
And a switch 2004. In addition, the processor core 401
Cache invalidation unit that invalidates the cache memory of
The device 2005 is provided. In addition, CODEC bus in
Interface 2014 communicates with the CODEC 418.
Function as a DMAC that performs data transfer. <PCI bus interface 416> PCI bus interface
The face 416 is a general-purpose
The B bus 405, which is an IO bus, and the IO bus outside the chip
A unit that interfaces between certain PCI buses.
You. <G bus arbiter 406, B bus arbiter 407>
404 arbitration is the central arbitration
Request method for each bus master.
Signal and grant signal. This arbiter is
Control method can be programmed. Where
All bus masters as a way to give priority to
Arbitration to give the bus right fairly with the same priority
Mode and priority of any one bus master
Priority arbitrage to raise the right and use the bus preferentially
Option mode can be specified. B bus arbi
407 is a bus using the B bus 405, which is an IO general-purpose bus.
Request is accepted, and after arbitration,
One master, and two or more masters
Access is prohibited. Arbitration
The formula has three levels of priority, and
Programmably assign multiple masters to iorit
Configuration. <Scanner / Printer Controller 408>
The printer controller 408 is controlled by the video I / F.
Connected to scanner and printer, internal bus G bus and B
A block that interfaces to the bus. Shown in FIG.
It is roughly divided into the following three blocks
You. Scanner controller 4302 The scanner controller 4302 includes a scanner and a video I
/ F, and controls its operation and data transfer.
U. G bus / B bus I / F unit (GBI) 4301
A is connected by IF bus, and data transfer and register
Read / write is performed. Printer controller 4303 The printer controller 4303 is a printer and a video I
/ F, and controls its operation and data transfer.
U. G bus / B bus I / F unit (GBI) 4301
B is connected by IF bus, and data transfer and register
Read / write is performed. -G bus / B bus I / F unit (GBI) 4301
A, BG bus / B bus I / F unit (GBI) 4301A,
B indicates the scanner controller 4302 and the printer controller.
For connecting the Troller 4303 to the G bus or B bus
Unit. Note that the scanner controller 4302 and
Printer controllers 4303 are connected independently.
It is connected to both the G bus and the B bus. G
Bus / B bus I / F units 4301A and B
And functions as a DMAC that performs data transfer.・ CP bus Scanner and printer image data and horizontal / vertical synchronization
This is a bus for directly connecting a synchronization signal to the bus. <Power management unit 409> Main controller 111
Is configured as a large-scale ASIC with a built-in CPU
ing. As a result, all internal logic operates simultaneously.
If this happens, a large amount of heat will be generated, and the chip itself will break down
There is a risk that it will. So, to prevent this, the main
The controller manages the power of each block, that is, the power manager.
Performs adjustments and monitors the power consumption of the entire chip
It is carried out. Power management is
Locks are performed individually. Information on the power consumption of each block
The information is used as the power management level as a power management unit.
Collected in knit (PMU) 409. In PMU 409
Sums the power consumption of each block, and the value
In order not to exceed the power consumption,
The power consumption of each block is monitored collectively. Next, the book
Image from scanner, which is the main part in the embodiment
Data input, image data compression processing, image data thinning processing
Control for parallel processing and display on the liquid crystal display.
Will be described. A file executed by the CPU 401 of the present apparatus
The firmware is run on a real-time multitasking OS.
And each sequence control program is independent.
Performed as a standing task. In addition, the actual
OS provided to synchronize rows and exchange information
Use a message communication mechanism to In this embodiment,
Controls the image data input sequence from the scanner.
Task (scanner control task) and CODEC
(C) to control the compression sequence of image data
ODEC control task), image data thinning and liquid crystal
Tasks for displaying on the display unit (image display tasks)
I will explain the control to process the columns, but the present invention is this
Control for parallel processing among other tasks.
It is also possible to apply. First, the scanner control task
Refer to the flowchart shown in FIG.
It will be described in the light of the above. First, in step S701, the scan
Image data of a size corresponding to the scanned original and resolution
(Raster data) The memory area for storing
Secure on top. Then, in step S702,
Coded the address and size of the saved image data area
To notify the control task and the display task, the OS
Call the message transmission service. This message is
Also serves as a processing start request to the task. Then, step
In step S703, the scanned and read data is transferred.
To the scanner controller 4302 to send
The DMAC 4301A is set, and the subsequent step S7
At 04, a scan start instruction is issued to the reader unit 200.
And activates the scanner 210. Then, step S
In 705, the task sleep function provided by the OS
To stop the task processing for 50 msec.
Then, in step S706, the DMAC 4301
A. Read the value of the transfer counter register of
In step S707, the value is sent to another task.
Notify by transmission. In addition, the above-mentioned pick-up for 50 msec
Group yields CPU resources for other task processing
What to do, if the time is too short and three
Meaning it's meaningless, and if it's too long,
Because it becomes slow, CPU processing speed and DMA
Should be determined according to the transfer speed of the data. next,
In step S708, data transfer for one page is performed.
It is determined whether or not the processing has been completed.
5 to S707 are repeated. Note that the data transfer is completed.
The termination is performed by DMA interrupt processing.
Then, when data transfer for one page is completed, step
Proceeding from S708 to step S709, the leader unit 20
0 and the scanner controller 4302
Then, the reading process of one page is completed. Next, COD
FIG. 8 is a flow chart showing the operation procedure of the EC control task.
This will be described with reference to a chart. First, in step S801
In this case, the CODEC control task usually executes a process start request message.
In the message waiting state, the scanner control task shown in FIG.
Request to start processing and the accompanying image data storage
When the address and size are received, the process proceeds to step S802,
Secure memory area for saving compressed data on DRAM 116
I do. Usually, the data size after compression is unknown,
Reserve the same area as the original image (raster) data
And the excess will be released later. Next, step S803
In, the predetermined setting in the register of CODEC418
(Source address, destination address, data
Size, number of main scanning pixels, number of sub-scanning pixels)
Similar settings are made for AC2014. Next, step S
At 804, after the scan starts, how much data
Codec 41 after transferring (prestored data amount)
8 is started. Here the DM from the scanner
A transfer speed is Vs (byte / sec), CODEC data
Processing speed is Vc (byte / sec), total data transfer amount
Is Dt (byte), and the amount of restored data is Dp (byte)
And is represented by the following equation. Dp> Dt (1−Vs / Vc) (when Vs> Vc,
Dp> 0) For example, when Vc is three times faster than Vs (Vs
/ Vc = 1/3) is Dp> ２ / 3 · Dt.
After the transfer of 2/3 of the total data transfer amount is completed, COD
The EC will be activated. Next, in step S805
The amount of transferred data from the scanner control task.
Call the OS service that receives the notification message,
The DEC control task enters a waiting state. Then the scanner
When a message is sent from the control task, the task is
To step S806, and the
The amount of transferred data in the message is
Compare. Here, the amount of data
If the data transfer has not been completed, go to step S705.
It returns and enters the message waiting state again. In addition, data transfer
If the transmission has been completed, the process proceeds to step S807, and
Activate C418. Next, in step S808
Waiting for processing end interrupt from CODEC 418
When a processing end interrupt is detected, step S80 is executed.
9 and read the compressed data from the CODEC 418 register.
Data size, release the extra memory area,
The page compression processing ends. Next, the operation of the display task
The procedure will be described with reference to the flowchart shown in FIG.
I will tell. First, in step S901, a display task
Is normally in a process start request message waiting state.
From the scanner control task shown in FIG.
When the image data storage address and size accompanying the
Proceeding to step S902, the operation panel 417 corresponding thereto
LCD display area and clear that area
You. Then, in step S903, the displayed data is displayed.
The counter for counting data is set to "0". Next,
In step S904, transfer from the scanner control task
OS service that receives the notification message of the amount of used data
The calling and displaying tasks are in a waiting state. Then,
When a message is sent from the scanner control task, the display
The disk enters the execution state again, and proceeds to step S905.
Displayed amount of transferred data in the received message
Compares with the counter and thins out the difference data.
Work. Then, in step S906, thinning is performed.
Operation panel 41 via the panel I / F 132
7 and display it in step S907.
Update the data counter. Next, in step S908,
To determine whether the transfer for one page has been completed.
If not, the process returns to step S904, and the message is sent again.
It will be in the waiting state. Then, if the transfer is completed,
Proceeding to step S909, the amount secured by the scanner control task
Frees image data memory area and displays one page
To end. As described above, according to the present embodiment,
For example, in parallel with image data input from the scanner,
Data compression, thinning and display
When the page memory area is occupied as well as the processing speed is improved
The time can be shortened. In this embodiment,
Means that the amount of image data transferred from the scanner
Uses a method of detecting while polling at intervals
However, to improve the efficiency of CPU processing and the response speed
Are detected by hardware interrupt processing.
Is more preferable. For that purpose, DMAC430
When the transfer of a fixed amount of data from 1A is completed,
A mechanism to generate an interrupt to notify the end of transmission is implemented
It is good if it is. In that case, the scanner control task
Wait for interrupt from DMAC instead of loop processing
By executing, the operation can be realized. Ma
In this embodiment, the image data input system from the scanner is used.
Task to control the sequence (scanner control task)
Control CODEC to control image data compression sequence
Task to control (CODEC control task) and image data
Task for thinning out and displaying on the LCD (image table
Task) and the control to process in parallel
However, the present invention is not limited to this.
It is also possible to apply control that processes in parallel between disks.
Noh. The present invention is applicable to a plurality of devices (for example, a host
Computers, interface devices, readers, printers, etc.
Etc.), one device
(E.g., copying machines, facsimile machines, etc.)
Etc.). Also, the object of the present invention has been described above.
The program code of software that implements the functions of the embodiment
Supply the storage medium storing the code to the system or device
And the computer of the system or device (CPU
Or MPU) stored in a storage medium.
Can also be achieved by reading and executing
Needless to say. In this case, the program read from the storage medium
The program code itself implements the functions of the above-described embodiment.
The storage medium that stores the program code.
The body will constitute the invention. Program code
As a storage medium to supply, for example, floppy disk
Disk, hard disk, optical disk, magneto-optical disk
Disk, CD-ROM, CD-R, magnetic tape, non-volatile
A memory card, ROM, or the like can be used. Ma
Also, the computer executes the readout program code.
By doing so, the functions of the above-described embodiment are realized.
In addition, based on the instructions in the program code,
OS running on the computer (operating system
Perform some or all of the actual processing,
In some cases, the functions of the above-described embodiments are realized by
Needless to say, it is included. In addition, reading from storage media
The generated program code is inserted into the computer.
Function expansion boards and functions connected to the computer
After being written to the memory of the unit, the program
Function expansion board or function expansion
CPU of the extension unit is a part of the actual processing or
Performs all the functions of the above-described embodiment according to the processing.
It is needless to say that the case in which is realized is also included.

As described above, according to the present invention,
By controlling simultaneous access to the memory in a plurality of types of processing, it is possible to improve data processing throughput and memory use efficiency.

[Brief description of the drawings]

FIG. 1 is an image input / output system 100 according to an embodiment.
FIG. 2 is a diagram showing an overall configuration of the embodiment.

FIG. 2 is a cross-sectional view illustrating the structure of a reader unit 200 and a printer unit 300.

FIG. 3 is a block diagram illustrating a configuration of a control device 110 according to the present embodiment.

FIG. 4 is a main controller 111 according to the embodiment.
FIG. 3 is a block diagram showing the configuration of FIG.

FIG. 5 is a block diagram showing a configuration of a system bus bridge 402.

FIG. 6 is a block diagram illustrating a configuration of a scanner / printer controller 408.

FIG. 7 is a flowchart illustrating an operation procedure of a scanner control task.

FIG. 8 is a flowchart illustrating an operation procedure of a CODEC control task.

FIG. 9 is a flowchart illustrating an operation procedure of a display task.

Claims (9)

[Claims] An image input unit that reads an image and converts the image data into image data; a first transfer unit that transfers a predetermined amount of image data input by the image input unit to a storage unit that stores the image data; Second transfer means for transferring the image data stored in the storage means to first processing means for processing the image data; and image data stored in the storage means for the second processing means for processing the image data. A third transfer unit for transferring data, a data transfer speed of the first transfer unit,
Transfer amount calculating means for calculating the transfer amount of image data by the second transfer means based on the processing speed of the processing means, and image data of the transfer amount calculated by the transfer amount calculating means is transferred to the second transfer unit. Means for controlling the first processing means so as to start processing the image data when the image data is transferred by the means, and when a predetermined amount of image data by the first transfer means is transferred by the third transfer means, Control means for controlling the second processing means so as to start data processing. 2. The image processing apparatus according to claim 1, wherein the predetermined amount of image data transferred by the first transfer unit is image data input by the image input unit at predetermined time intervals. Image processing device. 3. The method according to claim 1, wherein the control unit is configured to:
2. The image processing apparatus according to claim 1, further comprising an arbitration unit that arbitrates simultaneous access to the storage unit by the second transfer unit and the third transfer unit. 4. The image processing apparatus according to claim 1, wherein the first processing means is compression processing means for compressing image data, and the second processing means includes resolution conversion means for converting the resolution of the image data. The image processing apparatus according to claim 1, wherein the image processing apparatus is a display processing unit that displays data. 5. A first transfer step for transferring a predetermined amount of image data input by an image input means for reading an image and converting the image data into image data, and a first processing means for processing the image data. A second transfer step of transferring the image data stored in the storage means, a third transfer step of transferring the image data stored in the storage means to a second processing means for processing the image data, A data transfer rate in the first transfer step;
A transfer amount calculating step of calculating a transfer amount of the image data in the second transfer step based on the processing speed of the processing means, and a transfer of the image data of the transfer amount calculated in the transfer amount calculating step is performed. Controlling the first processing means so as to start processing of the image data when the image data is transferred by the step, and when a predetermined amount of image data from the first transfer step is transferred by the third transfer step, A control step of controlling the second processing means so as to start data processing. 6. The image processing apparatus according to claim 5, wherein the predetermined amount of image data transferred in the first transfer step is image data input by the image input unit at predetermined time intervals. A method for controlling an image processing apparatus. 7. The method according to claim 7, wherein the control step includes the first transfer step,
6. The control method according to claim 5, further comprising an arbitration step of arbitrating simultaneous access to the storage unit in the second transfer step and the third transfer step. 8. The first processing means is compression processing means for compressing image data, and the second processing means includes resolution conversion means for converting the resolution of the image data, 6. The control method for an image processing apparatus according to claim 5, wherein the display processing means displays data. 9. A computer-readable storage medium storing a program code of a control method in an image processing apparatus, wherein a predetermined amount of image data input by image input means for reading an image and converting the image data into image data is stored. A code for a first transfer step for transferring the image data to the storage means, a code for a second transfer step for transferring the image data stored in the storage means to the first processing means for processing the image data, A code of a third transfer step for transferring the image data stored in the storage means to the second processing means, a data transfer rate of the first transfer step,
A code of a transfer amount calculation step for calculating a transfer amount of image data in the second transfer step based on the processing speed of the processing means of the second transfer step; Controlling the first processing means so as to start processing the image data when the image data is transferred in the third transfer step, and a predetermined amount of image data in the first transfer step is transferred in the third transfer step And a code for a control step for controlling the second processing means so as to start processing the image data.