JP2002314801A - Image processor, its control method, and computer- readable recording medium storing its control program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable an image processor that reads a manuscript at a set variable power by skimming through the manuscript to save the capacity of a buffer memory which stores read image data by reading the manuscript correspondingly to the set variable power even when the power is too high for the capacity of the buffer memory due to the size of the manuscript. SOLUTION: When the image processor simultaneously reads both surfaces of the manuscript by skimming through the manuscript, the processor determines whether or not all image data read from the manuscript by one-time reading operation can be stored in the buffer memory from the size of the manuscript, set variable power, and capacity of the memory (S11). When the determined result is 'No', the processor reads the manuscript by skimming through the manuscript by setting the manuscript transporting speed to the speed corresponding to 100% magnification and stores read image data in the buffer (S14). Then the processor digitally changes the magnification of the image data so that the data may correspond to the set variable power (S15).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image processing apparatus having a function of reading an original image data, storing the image data in a buffer memory, compressing the image data, and storing the compressed image data in a compressed image memory. The present invention relates to a computer-readable storage medium storing the control program.

[0002]

2. Description of the Related Art Generally, in an image processing apparatus (image forming apparatus) such as a digital copying machine, image data of a document read one by one is not stored in a memory as it is, but is temporarily stored in a buffer memory. After that, the data is compressed into code data of a predetermined coding method and stored in the compressed image memory. Code data (compressed image data) is read from the compressed image memory in response to a request from the system, decoded into the original image data, output to the image forming unit, and forms an image on paper. When the image formation is completed,
The compressed image data on which the image is based is deleted from the compressed image memory.

In this type of image processing apparatus, an automatic document feeder (Auto Document Feeder) for automatically conveying documents one by one onto a reader unit for reading image data of the document.
r: hereinafter abbreviated as ADF). With this configuration, in order to read the image data of the document at a high speed, the ADF is used in a state where each member of the optical system of the image reading mechanism is stopped at the position corresponding to the predetermined image reading position by the reader unit. 2. Description of the Related Art There is provided an image processing apparatus having a document flow reading function for reading image data of a document while transporting the documents one by one over an image reading position.

Further, there is an image processing apparatus in which image data on both sides of a document can be read by moving the document. In the conventional general configuration, one-sided original reading reads image data on one side of one original, then reverses the front and back of the original and performs the original-sided reading again to read the original on the opposite side. The image data of one side was read.

On the other hand, recently, an image sensor for reading image data of an original is provided also on the ADF side, and an apparatus having a configuration in which image data on both sides of one original can be read at the same time by one original flow reading. Is also provided. In this apparatus, the document reading speed is not different from that of reading a single-sided document, and the document transport path is monotonous, so that the document is not damaged at the time of conveyance, as compared with the above-described conventional one-sided scanning. There is a merit that it decreases.

On the other hand, in a general configuration of this type of image processing apparatus, a magnification for enlarging an image read by a user of the apparatus can be set on an operation panel, and image data is read at the set magnification. It has become. As the method, a method of controlling the document transport speed during the moving original reading, that is, the speed of the sub-scanning (the slower the higher the magnification ratio), is adopted. In this method, the magnification in the sub-scanning direction can be adjusted by adjusting the resolution in the sub-scanning direction. However, this cannot be done in the main scanning direction. Therefore, the magnification is obtained by interpolating or thinning the read image data. Digital scaling is performed. In this method, it goes without saying that the larger the set magnification, the larger the amount of image data to be read.

[0007]

In the above-described image processing apparatus having the function of moving originals, a series of processes from reading image data by moving originals to storing compressed image data in the compressed image memory (hereinafter, referred to as "compressed image data") will be described. When performing a document reading process), the compressed image memory becomes full. In order to prevent the read image data from being lost when the memory becomes full, the compression of the image data read by one original moving reading is performed. And storing the image data in a buffer memory until the storage in the compressed image memory ends normally.

In this method, the capacity of the buffer memory is
At least a capacity that can store the entire image data read in one original flow reading, and a capacity that can store image data for one page of the original for single-sided reading and two pages for double-sided simultaneous reading. Is done. The above-mentioned one or two pages is one or two pages of a document of the maximum readable size (for example, A3), and if the set magnification ratio is higher than 100%, A capacity larger than one or two pages is required.

However, in this case, particularly in the case of simultaneous double-sided reading and assuming that the set magnification is high, there is a problem that a considerably large buffer memory capacity is required and the cost is increased. Was. In addition,
Needless to say, it is better to save the capacity of the buffer memory as much as possible even in the case of single-sided reading.

Accordingly, an object of the present invention is to provide a function of performing the original reading process by the above-described original flow reading, and at the time of the original reading process, the original feeding speed of the original flow reading according to the set magnification. In an image processing apparatus that reads image data at a set magnification by controlling the size of a buffer memory in relation to the size of the original, the magnification of the magnification set at the time of the original reading processing by moving original reading is controlled. Even if it is too high, the original reading process can be performed at a set magnification to save the capacity of the buffer memory.

[0011]

According to the present invention, there is provided a document feeder, an image reading means, a buffer memory, and a compressed image memory. After reading the image data of the original by the image reading unit while carrying the documents one by one so as to pass through the image reading position of the image reading unit, the read image data is stored in the buffer memory. An image processing apparatus for performing a document reading process of compressing and storing the compressed document in the compressed image memory, comprising: magnification setting means for setting a magnification of magnification when a user reads image data of the document; At the time of original reading processing by reading, the original conveying speed of the original flow reading is controlled according to the magnification set by the magnification setting means. The image processing apparatus, a control method for reading image data by the set magnification,
And in a computer-readable storage medium storing the control program, the size of the original set in the original transport unit and the size set by the magnification setting unit when performing the original reading process by the original flow reading. From the magnification and the capacity of the buffer memory, it is determined whether or not all the image data of the original to be read in one original moving-reading can be stored in the buffer memory. The original is read at a document transport speed corresponding to a magnification lower than the set magnification, the read image data is stored in the buffer memory, and the image data is digitally scaled so as to correspond to the set magnification. Control was performed.

Further, the image reading means is configured to be capable of performing both-side simultaneous reading of simultaneously reading image data of both sides of the document, in addition to single-side reading for reading image data of only one side of the document in the document flow reading. Only when the two-sided simultaneous reading is performed in the original reading process by the original flowing reading, the control from the determination as to whether or not the data can be stored in the buffer memory to the digital scaling is performed.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. Here, an embodiment of an image processing apparatus configured as a digital copying machine will be described. The apparatus according to the embodiment is capable of performing the original reading process by the above-described original flow reading, and furthermore, simultaneously with the single-sided reading for reading the image data of only one side of the original, the two-sided simultaneous reading for simultaneously reading the image data of the both sides of the original. Is possible.

First, the mechanical configuration of the image processing apparatus according to the present embodiment will be described with reference to FIGS.

As shown in FIG.
A reader unit 50 for reading image data of a document, a controller unit 30 for processing the read image data and controlling the entire apparatus, and forming (printing) an image on a sheet based on image data output from the controller unit 30 ) Printer unit 100. An ADF (automatic document feeder) 60 that automatically feeds documents (sheet documents) one by one to the reader unit 50 is provided on the reader unit 50.
Is installed.

First, the ADF 60 will be described. ADF
Reference numeral 60 denotes a hinge (see FIG. 3) provided as a fulcrum on the reader unit 50 so as to be openable and closable, and a book or sheet document (not shown) on the platen glass 57 of the reader unit 50 (not shown). (When the paper is not fed). That is, in this apparatus, a book original is placed on the original
The sheet scanning is performed by pressing the button 60 and reading the image data of the book document by the reader unit 50, and the document scanning by reading the image data of the sheet document by the reader unit 50 while the sheet document is conveyed one by one by the ADF 60. I can do it. By scanning the originals, the scanning mechanism can be simplified and the reading time can be shortened, compared with the case where the originals are transported to a predetermined position and scanned at rest, as in conventional copiers. can do.

FIG. 2 shows a state in which the document conveying path of the ADF 60 is opened. As shown here, ADF60
Is composed of a pressure plate portion 60a for pressing a book document or a sheet document on the platen glass 57, a document transport portion 60b for transporting the sheet document, and a transport guide portion 60c constituting a document transport path along the outer periphery of the document transport portion 60b. ing.

The document transport section 60b is attached to the pressure plate section 60a so as to be rotatable about a rotation shaft 78 perpendicular to the document transport direction. Similarly, the original conveyance guide portion 60c has a rotary shaft 79 perpendicular to the original conveyance direction with respect to the pressure plate portion 60a.
It is attached so as to be rotatable around. In the state of FIG. 1 in which the document transport guide section 60c and the document transport section 60b are closed, a series of document transport paths are formed from the document feed port 64 to the document discharge port 75.

A document stacking tray 61 provided with a document width regulating plate 63 for aligning both ends of a bundle of sheet documents is provided outside the document feed port 64.
A document size sensor 62 composed of an optical sensor for detecting the size of a document set thereon and a document presence / absence sensor (not shown) for detecting the presence / absence of a document are provided.

At the time of document conveyance, sheet documents set on a document stacking tray 61 are separated and conveyed one by one from a document feed port 64 by a separation roller 65, pass through a document conveyance path 66, and further control the conveyance timing. The sheet is transported by a registration roller 67 for performing the operation.

A first document pressing roller 69 is provided downstream of the registration roller 67 in the document conveying path.
An opening 68 (see FIG. 2) is provided in the pressure plate portion 60a below the document pressing roller 69. In addition, a flow-reading glass 59 is provided on a portion of the upper surface of the reader unit 50 facing the opening 68. The document pressing roller 69 elastically presses the sheet document against the reading glass 59 by the pressing force of the spring 77 (see FIG. 3). At the outer periphery of the roller 69, the reading glass 5
The position of the generatrix portion in contact with 9 is the first image reading position A1 at the time of original scanning. When the operation stops or a jam occurs during the document conveyance, as shown in FIG. 2, by opening the document conveyance guide portion 60c and the document conveyance portion 60b, the press-contact of the document pressure roller 69 is released and the conveyance path is stopped. It is possible to remove the sheet document staying inside.

Further, a document jump table 58 is provided on the upper surface of the reader section 50 downstream of the flow reading glass 59, and scoops up the leading edge of the document that has passed the image reading position A1 and guides it upward. The picked-up document is supplied to the guide plate 70a of the pressure plate portion 60a and the document conveying portion 6
The document enters a document feed path 70 formed by a guide plate 70b (see FIG. 2) of the document guide 0b.

The original conveying section 60 faces the original conveying path 70.
b, a contact type image sensor 71 is provided in parallel with the rotation shaft 78, and a second document pressing roller 72 is provided on the pressure plate portion 60a so as to face the sensor 71. The roller 72 presses the sheet document against the contact image sensor 71 by the pressing force of a spring (not shown). This press-contact position is the second image reading position A2 in the moving original reading.

When a document jam occurs, the contact type image sensor 71 and the document pressing roller 72 are separated from each other by rotating the document conveying portion 60b about the rotation shaft 78 as shown in FIG. Can be removed.

The document having passed through the second image reading position A2 is discharged from a document discharge port 75 by discharge rollers 73 and 74 provided opposite to the pressure plate portion 60a and the document conveying portion 60b.

In the case of moving original reading, the conveying speed of the original conveyed by the ADF 60, that is, the speed of the sub-scanning, is controlled in accordance with the scaling factor set as described later. These are the rollers 65, 67, 69, 7 of the ADF 60.
The control is performed by a motor (not shown) that rotationally drives the motors 2 and 74.

Next, the reader section 50 will be described. An image reading mechanism of a 2: 1 reduction optical system is provided below the flow reading glass 59 and the document table glass 57 in the main body of the reader unit 50. The mechanism is a light source 51,
Reflective umbrella 52, mirrors 53, 54a, 54b, lens group 5
5 and a CCD image sensor 56. Light source 51,
The reflecting umbrella 52 and the mirror 53 are integrally moved in the left and right direction in FIG. 1, and the mirrors 54a and 54b are separately and integrally moved in the left and right direction.

When reading image data of a book document or a sheet document set on the platen glass 57,
The light source 51, the reflector 52, and the mirror 53 are composed of a platen glass 57.
A moves along the lower side of the area A3 at a predetermined speed in the right direction, and the mirrors 54a and 54b move in the same direction at half the speed. The original on the platen glass 57 is illuminated by the light source 51, and an image of one side of the original due to the reflected light is transmitted through the mirrors 53, 54 a, 54 b and the lens group 55.
An image is formed on the CD image sensor 56 and photoelectrically converted.

On the other hand, at the time of moving original reading, the light source 51, the reflector 52, and the mirrors 53, 54a and 54b are respectively shown in FIGS.
The reading operation is performed in a state where the reading operation is stopped at the position shown in FIG. By driving the ADF 60, the document stacking tray 61
The sheet document set on the upper side is
The originals are separated one by one, and the original is then
The document is transported along the document transport path up to.

At this time, the portion of the document passing through the image reading position A1 is illuminated by the light source 51, and the image of one side (front surface) of the document due to the reflected light is reflected by the mirrors 53, 54a,
An image is formed on the CCD image sensor 56 via the lens group 55b and the lens group 55, and is photoelectrically converted.

When reading image data of only one side (front side) of the document, only the CCD image sensor 56 is driven.
Contact image sensor 7 with D image sensor 56
1 is also driven. At this time, the portion of the document passing through the reading position A2 is the light source 71a of the contact type image sensor 71.
One side (back side) of the original by the reflected light
Is photoelectrically converted by the contact image sensor 71.

At the time of moving original reading, the light source 51 is located immediately below the first image reading position A 1, but the light from the light source 51 becomes stray light and does not enter the close contact type image sensor 71 so as to prevent the light from entering the original image sensor 71. The guide plates 70a and 70b forming the transport path 70 are curved in a convex shape, and the document transport path 70 is formed in an S shape to shield light. Further, the light from the light source 71a in the contact type image sensor 71 is also blocked by the S-shaped path so that the light does not reach the image reading position A1.

An electric signal (analog signal) corresponding to an image output from the CCD image sensor 56 or the close contact type image sensor 71 is amplified and binarized by a signal processing circuit (not shown), and a digital image data signal is output. Is input to the controller unit 3. Controller part 3
Performs various types of image processing according to various settings on an operation panel of the apparatus, which will be described later, on input image data. If image formation (printing) is instructed on the operation panel, processing is performed. The output image data is output to the printer unit 2.
The printer unit 100 forms (prints) an image on paper based on the input image data.

Next, the printer section 100 will be described. In the configuration of the printer unit 100 shown in FIG. 1, at the time of image formation, a laser beam modulated by a video signal corresponding to image data is emitted from the laser scanner unit 101 to the photosensitive drum 102, and the photosensitive drum 102 is scanned. An electrostatic latent image is formed on the toner image, and is further developed as a toner image by the toner developing device 103.

On the other hand, the paper P is sent out one by one from a paper cassette 104 by a paper feed roller 105 and further conveyed to a photosensitive drum 102 via a registration roller 106 for controlling the conveyance timing. Therefore, the photosensitive drum 102
Is transferred to the surface of the paper P by the transfer roller 107 and further fixed by the fixing roller 108.

Thereafter, the paper P is discharged by the paper discharge roller 109. When an image is to be formed on the back surface of the paper P,
After the paper P is conveyed by a predetermined amount to the right in the drawing by the discharge roller 109, the paper P is conveyed backward to the left, and conveyed to the reversing path 111 via the reversing flapper 110. Paper P is reverse path 11
After being turned over at 1, the sheet P is again conveyed to the photosensitive drum 102 via the registration roller 106, and after the image is formed on the back surface of the sheet P in the same manner as the front surface,
The paper P is discharged by the discharge rollers 109.

Next, the configuration of the controller 30 will be described with reference to FIG. As shown in FIG.
Is the reader unit 50 via the reader interface 301.
And to the printer unit 100 via the printer interface 310.

The controller unit 30 includes a reader memory 302, an encoder 303, a compressed image memory 304, a decoder 305, a page memory 306, a CPU, in addition to the reader interface 301 and the printer interface 310.
(central processing unit) 307, RAM (random acc
ess memory) 308, ROM (read only memory) 309
And an image editing memory 311.

The reader memory 302 is a buffer memory for temporarily storing image data (raw data before compression) read by the reader unit 50, and has a capacity of the largest original which can be read by the reader unit 50. It is image data of two pages (for example, four pages for A4 size) of an A3-size original, and the image data is converted at a magnification of 100%, that is, at a resolution in the sub-scanning direction corresponding to the same magnification. The capacity corresponds to the amount of image data when the document is read, that is, when the document is read at a document transport speed corresponding to a magnification of 100% at the time of moving document reading. Thus, A
Image data on both sides of a document having a size of 3 or less can be simultaneously read and stored.

The encoder 303 includes a reader memory 302
Is encoded by a predetermined encoding method and compressed.

The compressed image memory 304 includes the encoder 30
3 for storing compressed image data obtained by compression for a plurality of pages.

The decoder 305 includes a compressed image memory 304
The compressed image data stored in the page memory 306 is analyzed, decompressed to original image data before compression, and expanded on the page memory 306.

The ROM 309 stores a control program executed by the CPU 307, and corresponds to an embodiment of a computer-readable storage medium storing a control program of the image processing apparatus according to the present invention.

The CPU 307 controls each section of the controller section 30 according to a control program stored in the ROM 309, and controls the entire apparatus. RAM
308 is used as a work area of the CPU 307.

The image editing memory 311 is used when the CPU 307 digitally scales the image data stored in the reader memory 302, that is, enlarges the image data by a process such as linear interpolation or enlarges or reduces the image data. It is used when it does. The scaled image data is expanded on the image editing memory 311, compressed by the encoder 303, and stored in the compressed image memory 304.

In FIG. 4, reference numeral 601 denotes an ADF 60.
Is a document transport control unit for controlling the operation of the reader unit 50.
The ADF 60 is controlled to communicate with the ADF 60 as a whole. The document transport control unit 601 controls the controller
0, in response to an instruction notified via the reader unit 50,
The transport speed of the document transported by the ADF 60 is controlled.

Next, the flow of image data in the configuration shown in FIG. 4 will be described. The image data of the document read by the reader unit 50 is input to the controller unit 3 via the reader interface 301 and is read by the reader memory 302.
, And compressed by the encoder 303 and stored in the compressed image memory 304.

In a normal copying operation, the compressed image memory 3
The image data 04 is analyzed and decompressed by the decoder 305, expanded on the page memory 306, output to the printer unit 100 from the printer interface 310, and the printer unit 100 forms an image on paper based on the output data.

If the image output and formation have been performed normally, the compressed image memory 304 based on which the output image is based
The inside compressed image data is deleted. Then, as a result of newly storing the compressed image data in the compressed image memory 304,
When it is determined that the image data cannot be accommodated, it is processed as the memory of the compressed image memory 304 being full.

When reading the image data of both sides of the original at the same time, the read image data of both sides are stored in separate areas in the reader memory 302, and after the reading is completed, they are collectively compressed by the encoder 303 to be compressed. Stored in 304. However, it is needless to say that the image data is handled as two pages.

After the image data of the document is read and stored in the reader memory 302, if necessary, the image editing memory 311 is used to read the image data from the reader memory 30 as described later.
CPU performs digital scaling on image data in 2
The scaled image data is expanded by the image editing memory 311, compressed by the encoder 303, and stored in the compressed image memory 304.

Next, the configuration of the operation panel of the present apparatus will be described with reference to FIG. The operation panel is provided, for example, in a space on the upper surface of the reader unit 50 and on the front side of the ADF 60.

On the operation panel 20 shown in FIG.
Is a display unit for displaying the operation status of the apparatus and various messages. The surface of the display unit 21 is a touch panel, and functions as an input key when touched by a user of the apparatus. In particular, reference numeral 21a is a magnification key for setting the magnification ratio to the same magnification, and reference numeral 21b is a magnification key for setting the magnification ratio to a desired value. The magnification currently set by the two keys 21a and 21b is displayed above the keys 21a and 21b. The portion indicated by reference numeral 21c is set by selecting a double-sided reading mode in which original scanning is performed by performing simultaneous double-sided reading in original scanning, or a single-sided reading mode in which original reading is performed by performing single-sided reading in original scanning. Key for selecting a double-sided / single-sided mode.

Numeral 22 denotes a numeric keypad for inputting a number. Here, the number of copies for one document is set.

Reference numeral 23 denotes a start key, and when this key is pressed, an original reading operation is started. At this time, if the sheet document is set on the ADF 60, the document reading operation by the document moving reading is performed.

Reference numeral 24 denotes a function key, which enables one-touch switching between a copy operation, a box function, and an extended function. Note that the box function is a function of storing image data of a read document in a hard disk device (not shown) provided in the main body of the apparatus.

Next, the operation of the original reading process by the original flow reading in the image processing apparatus of the present embodiment will be described.
The processing procedure will be described with reference to the flowcharts of FIGS. 6 and 7. Note that the original reading process by original scanning is started when the user of this apparatus sets an original on the ADF 60 and then presses the start key 23 of the operation panel 20. Before that, the user needs to Key 21 on the touch panel of the display unit 21 of the operation panel 20
The magnification of the magnification is set by the a or magnification key 21b, and the above-described double-sided reading mode or single-sided reading mode is selected and set by the double-sided / single-sided mode selection key 21c. The processing operation described below is performed under the control of the CPU 307 which performs control according to a control program stored in the ROM 309 of the controller unit 30.

FIG. 6 shows a main routine of an original reading process by original reading.

First, in step S1 of FIG.
It is determined whether or not a document is set on the document stacking tray 61, and if it is not set, the process waits for setting. Whether a document is set is detected by a document presence sensor (not shown) provided on the document stacking tray 61.

When the document is set, the process proceeds to step S2, where it is determined whether or not the start key 23 on the operation panel 20 has been pressed.

If the start key 23 has been pressed, the operation proceeds to step S3, where the CCD image sensor 56 and the contact image sensor (CIS (Contact Image Senso
abbreviated as r), the shading correction 71 is performed, and then the light source 51, the reflector 52, the mirrors 53, 5
4a and 54b are moved to the respective positions shown in FIGS. 1 to 3 where reading at the image reading position A1 is possible, and are stopped there.

Then, the process proceeds to step S4, where it is determined whether or not the mode of the original reading process set by the double / single-sided mode selection key 21c of the operation panel 20 is the double-sided reading mode (ie, the single-sided reading mode). In the case of the both-side reading mode, the process proceeds to step S5 to perform the both-side reading mode processing. This processing will be described later with reference to FIG.

If the mode is the one-sided reading mode, the process proceeds to step S6 to perform the one-sided reading mode process. In the single-sided reading mode processing, the CCD image sensor 56
Is driven, but the contact-type image sensor 71 is not driven to read the original without moving, and reads image data of only one side of the original at the image reading position A1. Here, the document transport speed (the transport speed at the position A <b> 1) of the document flow reading is a transport speed corresponding to the magnification of the magnification set on the operation panel 20. Then, after the read image data is stored in the reader memory 302 via the reader interface 301, it is compressed by the encoder 303 and stored in the compressed image memory 304.

Then, step S5 or step S6
When this process is completed, this routine is terminated.

Next, the operation of the double-sided reading mode process performed in step S5 will be described with reference to the flowchart of FIG.

First, in step S 11 of FIG. 7, the magnification of the magnification set on the operation panel 20, the size of the original set on the ADF 60 detected by the original size sensor 62 of the ADF 60, and the capacity of the reader memory 302 Then, it is determined whether or not all of the image data (in this case, image data of two pages on both sides of the document) read by one document flow reading can be stored in the reader memory 302. That is, assuming that the original scanning is performed at the original transport speed corresponding to the set magnification, the amount of image data to be read in one original scanning is calculated from the resolution and the original size, and the image is read. It is determined whether the capacity of the memory corresponding to the amount of data is equal to or less than the capacity of the reader memory 302.

For example, it is assumed that the capacity of the reader memory 302 is a capacity corresponding to two pages of an A3 size document at a magnification of 100% (actual magnification). In other words, the capacity is set to a value corresponding to the image data to be read by performing one-time moving document reading on both sides of an A3-size document at a document conveying speed and resolution corresponding to a magnification of 100%. In this case, if the set original size is A3 and the set magnification is higher than 100%, 1
It is not possible to store in the reader memory 302 all of the image data to be read in the second original flow reading. The same applies to the case where the set magnification is higher than 141% even when the document size is A4.

If it is determined in step S11 that all of the image data can be stored in the reader memory 302, the flow advances to step S12 to set the document transport speed for the document flow reading to the speed corresponding to the set magnification. , And the read image data is stored in the reader memory 302. Thereafter, the image data stored in the reader memory 302 in step S13 is directly compressed by the encoder 303 and stored in the compressed image memory 304.

On the other hand, if it is determined in step S11 that the entire image data cannot be stored in the reader memory 302, the process proceeds to step S14, in which the document transport speed for moving document reading is set to the above set magnification ( In this case 10
Irrespective of whether it is higher than 0%), the original is read at a speed corresponding to the magnification of 100%, and the read image data is stored in the reader memory 302. Here, it is a matter of course that all the read image data can be stored in the reader memory 302 by setting the document conveying speed to a speed corresponding to a magnification of 100%.

Thereafter, in step S15, the image data stored in the reader memory 302 is added to the image editing memory 31 so as to correspond to the set magnification.
1 is used to perform digital magnification processing for enlargement such as linear interpolation for inflating image data. The digitally scaled image data is compressed by the encoder 303 and stored in the compressed image memory 304.

After steps S13 and S15, the process proceeds to step S16, where it is determined whether or not there is a document from which image data is to be read based on the output of a document presence sensor (not shown) provided on the document stacking tray 61 of the ADF 60. . If there is a next document, the process returns to step S11 to repeat the processing from step S11. If there is no next document, the process returns to the main routine and ends the routine.

If it is determined in step S13 or S15 that the compressed image memory 304 becomes full due to storing the compressed image data in the compressed image memory 304, the processing is interrupted and the memory of the compressed image memory 304 becomes full. Wait until is resolved. The compressed image data stored in the compressed image memory 304 is expanded by the decoder
When the image data is output to the printer unit 100 via the printer 10 and the image is formed normally, the compressed image data corresponding to the output image data is deleted in the compressed image memory 304, and the memory full state is eliminated. When the memory full condition is eliminated, the processing in step S13 or S15 is restarted, and the compression and storage of the image data are performed again.

According to the present embodiment as described above, for example, the capacity of the reader memory 302 is set to a capacity corresponding to a magnification of 100% for two pages of A3 size originals, and the original is read in the double-sided reading mode by moving original reading. When the original reading process is performed, even if the set original is A3 size, the set magnification is higher than 100%, and is originally too high for the capacity of the reader memory 302, the control shown in FIG. , The original reading process can be performed at the set magnification. Therefore, the capacity of the buffer memory can be saved, and the cost of the apparatus can be reduced.

The apparatus according to the present embodiment can perform both-side simultaneous reading and single-sided reading in original scanning, and performs the control shown in FIG. 7 in the both-side reading mode. The present invention can also be applied to a processing apparatus, and when the apparatus performs document reading processing in single-sided document flow reading, control as shown in FIG. 7 may be performed.

[0075]

As is apparent from the above description, according to the present invention, a function is provided for performing original reading processing by original reading, and in the original reading processing, original flowing is performed in accordance with a set magnification. In an image processing apparatus that controls image reading at a set magnification by controlling the original conveying speed for reading, when performing an original reading process by moving original reading, the original size, a set magnification ratio and a buffer are set. If it is determined from the memory capacity that all the image data of the original to be read in one original scanning cannot be stored in the buffer memory, the original is transported at an original transport speed corresponding to a lower magnification than the set magnification so that the image data can be stored. After scanning the image data and storing the read image data in the buffer memory, the image data is digitized to correspond to the set magnification. Even if the set scaling factor is too high for the size of the buffer memory in relation to the size of the document, the original reading process can be performed at the set scaling factor. Thus, an excellent effect that the capacity of the buffer memory can be saved and the cost of the apparatus can be reduced can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view illustrating an overall mechanical configuration of an image processing apparatus (digital copying machine) according to an embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view of an ADF peripheral portion of the ADF of the same device with a document conveyance unit and a conveyance guide unit opened.

FIG. 3 is a perspective view showing a mechanical configuration of an ADF peripheral portion of the apparatus.

FIG. 4 is a block diagram showing a configuration of a controller unit of the device.

FIG. 5 is a top view showing a configuration of an operation panel of the apparatus.

FIG. 6 is a flowchart illustrating a processing procedure of a main routine of a document reading process based on a document flow reading in the apparatus.

FIG. 7 is a flowchart illustrating a processing procedure of a double-sided reading mode process in step S5 in FIG. 6;

[Explanation of symbols]

 Reference Signs List 20 operation panel 21 display unit (touch panel) 21a 1: 1 key 21b magnification key 21c double-sided / single-sided mode selection key 30 controller unit 50 reader unit 56 CCD image sensor 60 ADF (automatic document feeder) 62 original size sensor 71 contact image sensor REFERENCE SIGNS LIST 100 printer unit 101 laser scanner unit 102 photosensitive drum 302 reader memory (buffer memory) 304 compressed image memory 307 CPU 309 ROM 311 image editing memory

 ────────────────────────────────────────────────── ─── Continued on the front page F term (reference) 5B047 AA01 BA01 CB25 5C072 AA01 BA01 BA03 BA09 NA05 TA07 UA11 WA02 XA01 5C076 AA22 BA01 BA03 BA04 BA05 BA06 BB31 CB00 CB04

Claims (6)

[Claims] An image reading unit configured to convey a sheet of document one sheet at a time through the image reading position of the image reading unit; An image processing apparatus for performing a document reading process of reading a document image data by the image reading means, storing the read image data in the buffer memory, compressing the read image data, and storing the compressed image data in the compressed image memory; And a magnification setting means for setting a magnification of magnification when a user reads the image data of the original, wherein the magnification set by the magnification setting means at the time of the original reading processing by the original flow reading. The image reading speed is controlled according to the document feed speed, and the image data is read at the set magnification. In the processing device, a document size detection unit that detects a size of a document set in the document conveyance unit, and a size of the document detected by the document size detection unit when performing a document reading process by the document flow reading. From the magnification set by the magnification setting means and the capacity of the buffer memory, it was determined whether or not all the image data of the original read by one original flow reading can be stored in the buffer memory. In such a case, the document is scanned and read at a document transport speed corresponding to a magnification lower than the set magnification, the read image data is stored in the buffer memory, and the image data is stored in the buffer memory. Control means for performing digital magnification control so as to correspond to (1). 2. The image reading means is configured to perform both-side simultaneous reading of simultaneously reading image data of both sides of a document, in addition to single-side reading of reading image data of only one side of the document in the moving document reading, 2. The control device according to claim 1, wherein the control means performs control from a determination as to whether or not the data can be stored in the buffer memory to digital zooming only when the two-sided simultaneous reading is performed in the original reading process by the moving original reading. The image processing apparatus according to any one of the preceding claims. 3. A document conveying device, an image reading device, a buffer memory, and a compressed image memory, wherein the document conveying device conveys a document sheet one by one so as to pass through the image reading position of the image reading device. An image processing apparatus for performing a document reading process of reading a document image data by the image reading means, storing the read image data in the buffer memory, compressing the read image data, and storing the compressed image data in the compressed image memory; And a magnification setting means for setting a magnification of magnification when a user reads the image data of the original, wherein the magnification set by the magnification setting means at the time of the original reading processing by the original flow reading. The image reading speed is controlled according to the document feed speed, and the image data is read at the set magnification. A method of controlling a processing apparatus, when performing a document reading processing by the document flow reading, the size of the document set in the document conveying means,
When it is determined from the magnification set by the magnification setting means and the capacity of the buffer memory whether or not all image data of the original read in one original flow reading can be stored in the buffer memory, and it is determined that the image data cannot be stored. In order to be able to store the original, the document is scanned at a document transport speed corresponding to a magnification lower than the set magnification, and the read image data is stored in the buffer memory. A control method for an image processing apparatus, wherein control for digital scaling is performed in a corresponding manner. 4. The apparatus according to claim 1, wherein said image reading means is capable of performing both-side simultaneous reading for simultaneously reading image data on both sides of the original, as well as one-side reading for reading image data on only one side of the original in said moving original reading. 4. The control according to claim 3, wherein the control from the determination as to whether or not the data can be stored in the buffer memory to the digital scaling is performed only when the two-sided simultaneous reading is performed in the original reading process by the original flow reading. A method for controlling an image processing apparatus. 5. A document conveying means, an image reading means, a buffer memory, and a compressed image memory, wherein the document conveying means conveys sheets of a sheet one by one so as to pass through the image reading position of the image reading means. An image processing apparatus for performing a document reading process of reading a document image data by the image reading means, storing the read image data in the buffer memory, compressing the read image data, and storing the compressed image data in the compressed image memory; And a magnification setting means for setting a magnification of magnification when a user reads the image data of the original, wherein the magnification set by the magnification setting means at the time of the original reading processing by the original flow reading. The image reading speed is controlled according to the document feed speed, and the image data is read at the set magnification. In a computer readable storage medium storing a control program of the processing unit, when performing the original reading processing by the document flow reading, the size of the document set in the document conveying means,
When it is determined from the magnification set by the magnification setting means and the capacity of the buffer memory whether or not all image data of the original read in one original flow reading can be stored in the buffer memory, and it is determined that the image data cannot be stored. In order to be able to store the original, the document is scanned at a document transport speed corresponding to a magnification lower than the set magnification, and the read image data is stored in the buffer memory. A storage medium storing a control program for performing control corresponding to digital scaling in a corresponding manner. 6. The image reading device according to claim 1, wherein the image reading means is configured to perform both-side simultaneous reading for simultaneously reading image data on both sides of the document, in addition to single-side reading for reading image data on only one side of the document in the moving document reading. As a feature, a control program for performing control from the determination as to whether or not the data can be stored in the buffer memory to the digital scaling in the case of performing the two-sided simultaneous reading in the original reading process by the original flow reading is stored. The storage medium according to claim 5, wherein