JPH07131603A - Image reading and paging device for book original - Google Patents

Abstract

PURPOSE:To provide the image reading and paging device for book original causing no omission of image even when the enlargement processing of read images in performed. CONSTITUTION:Before the reading operation of a book original BO set at a reference before the center of an effective reading area V is started, a reading start position R is calculated by calculating the size of the book original BO from a magnification and a set image size set by a user. Then, the reading of original images is started from that position. Thus, enlarged image data Dk are stored in a frame memory area F from that reading start point R1. Therefore, an enlarged read area Vk is made larger than the memory area F but all the enlarged data Dk are stored inside the frame memory area F.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a book document image reading and page turning apparatus used in an image forming apparatus such as a copying machine or a facsimile.

[0002]

2. Description of the Related Art Conventionally, an automatic document feeder, which is mounted on an image forming apparatus such as a copying machine or a facsimile, automatically conveys a document, sets it at a reading position, and discharges the document that has been read out of the machine ( ADF) is well known. But,
Originals that can be automatically conveyed by the ADF are usually only sheet-like originals, and in the case of an original with a bound portion such as a book (book) or a notebook (hereinafter referred to as a book original), the ADF is used. However, the user had to manually open the page to be read of the book document and set it on the reading table of the image forming apparatus. After the reading is finished, when reading another page, the user has to manually turn the page, which is troublesome and troublesome. For this reason, the applicant of the present application has previously proposed a document reading device capable of automatically turning pages of a book document to read an image.

The book document image reading and page turning apparatus proposed by the present applicant will be described below.

A page-turning original reading apparatus (hereinafter referred to as TPS: Turn the Page Scanne) shown in FIG.
Reference numeral 500 denotes a scanner unit 30 and a document table unit 35. Scanner unit 30
Is provided so as to be openable and closable with respect to the document table unit 35. A scanning unit 200 is provided inside the scanner unit 30 so as to be able to travel in the left-right direction in the drawing. Further, the document table unit 35 arranged under the scanner unit 30 has a pair of document tables 1 whose heights can be adjusted individually, and a book document BO is placed on the pair of document tables 1. Left and right pages are placed in a double-page spread.
Then, the scanning unit 200 reads the document image on the document table 1. On the other hand, a contact glass 206 is arranged on the upper surface of the scanner unit 30, and a sheet-shaped original document or the like is set on the contact glass 206 by a pressure plate (not shown), and the original document is read by the scanning unit 200 after the optical path is switched. The original image on the contact glass 206 can be read by scanning.

A slide plate 3 is fixed under each document table 1. Each slide plate 3 has a box shape in which the front and rear sides and the outer side surfaces are bent downward. The slide plate 3 can be slid to the left and right, and the manuscript table 1
According to the thickness of the book manuscript placed on the left and right manuscript table 1
You can adjust the interval. In addition, each manuscript table 1 and slide plate 3 include a link plate 10 and a link arm 1.
1 is configured to be movable in the vertical direction, and a spring (not shown) constantly urges a force to rise. However, as will be described later, when the scanning optical path in the scanning unit 200 is switched to read the original on the contact glass, the original table unit 35 is arranged so that the lower portion of the scanning unit 200 and the upper surface of the original table 1 do not come into contact with each other. The original table 1 is retracted to the lower position of.

One end of a control wire 40 is fixed to the upper end of the link plate 10. The control wire 40 is the pulley 4
The direction is changed via 6, 47, and it is wound around the control pulley 48. The other end of the control wire 40 is constantly pulled by a spring (not shown) fixed to the base 6 of the document table unit 35. Although detailed description is omitted, the control pulley 48 is rotated by a mechanism including a gear 56, a worm wheel 58, a worm gear 60, a motor 61, and the like.

When the motor 61 is driven in a predetermined direction, the control pulley 48 rotates in a predetermined direction, and the control wire 40
Move in the direction of the fixed end to the base 6. As a result, the left and right document tables 1 are lowered and retracted to the position below the document table unit 35.

When the motor 61 is driven in the reverse direction, the control pulley 48 becomes free-rotatable in the reverse direction by the action of a one-way clutch (not shown). The force of the spring for pushing the document table 1 upward is set to be stronger than the force of the spring for pulling the control wire 40. Therefore, when the control pulley 48 can freely rotate in the opposite direction, the control wire 40 moves toward the fixed end portion to the link plate 10. As a result, the left and right manuscript tables 1 are raised, and the manuscript surface of the book manuscript placed on the upper surface of each manuscript table 1 in an open state is pressed against the scanning unit 200.

When setting a book document on the TPS, the spine of the book document BO is applied to the back support plate 14 and the slide plate 3 is moved according to the thickness of the book document BO (width of the spine cover). The slide plate 3 can be slid and fixed by a size stopper (not shown). By this movement of the slide plate 3, the spine of the book original BO is pinched by the inner ends of the left and right original trays 1, and the slide plate 3 is fixed by the size stopper.
The page to start reading the book document BO is opened, set on the document tables 1 on the left and right, and the scanner unit 30 is closed.

The scanning unit 200 has document holding rollers 281a and 281b on both left and right sides of its lower portion, and sheet take-up rollers 280a and 280b on the outside thereof.
Each is rotatably supported. The sheet winding rollers 280a and 280b are wound around the central end portions of the document holding sheets 282a and 282b, which are independent from each other on the left and right sides, and the outer ends of the document holding sheets 282a and 282b are located in the scanner unit. It is fixed to each of 30 side plates. On the other hand, each document pressing roller 281
A platen glass 205 for reading a book original and a turning belt 208 for turning pages of the book original are arranged between a and 281b.

Inside the platen glass 205, two fluorescent lamps 201 and 202 for illuminating a book document are arranged. The book document image illuminated by these fluorescent lamps 201 and 202 is reflected by the first mirror 219 and then the second
The light is reflected by the mirror 220 and the third mirror 221 alternately, and finally passes through the lens 216 to form a reduced image on the CCD 101. Further, when reading a document placed on the contact glass 206, the switching mirror 222 retracted to a position deviated from the reading optical path is moved to a position shown by a dotted line in the figure by an optical path adjusting means (not shown). Reads into the optical path. Accordingly, the first mirror 219
The optical path between the second mirror 220 and the platen glass 2
Switched from the 05 side to the contact glass 206 side,
The original image on the contact glass 206 illuminated by the two fluorescent lamps 203 and 204 is reduced and imaged on the CCD 101 as in the case of a book original.

The above-mentioned turning belt 208 is wound around a turning belt drive roller 223 and a turning roller 224, and a charging roller 225 is arranged above the turning belt 208 and is in contact with the turning belt 208. . A drive gear (not shown) is fixed to the shaft end of the drive roller 223, and this drive gear meshes with a drive rack (not shown) via an idle gear (not shown). As a result, when the scanning unit 200 travels, the drive roller 223 rotates, and the turning belt 208 rotates at the same speed as the moving speed of the scanning unit 200.

When a high voltage is applied to the charging roller 225 at a predetermined timing while the scanning unit 200 is running and the turning belt 208 is driven, an alternating electric field is generated on the surface of the turning belt 208, and due to the action of this alternating electric field.
Book document BO that comes into contact with the surface of the turning belt 208
Adsorption force is generated to adsorb the top page of.

The scanning unit 200 is located at the left end home position in the scanner unit 30 when the reading operation is not performed. Then, when the document reading operation is started, the scanning unit 200 starts traveling rightward in the drawing. Then, the optical system of the scanning unit 200 starts the reading operation of the book document BO and reads the document surface from the left page to the right page. Scanning unit 20
When 0 moves to the right end of the scanner unit 30, the image reading ends, the document scanning direction of the scanning unit 200 is reversed, and the page turning operation of the right page of the book document BO that has finished reading is started.

When the page turning of the right page of the book original BO is started, the lower surface of the turning belt 208 is the book original BO.
Is touched on the page. At that time, prior to this page turning operation, the charging pattern portion formed on the surface of the page turning belt 208 overlaps the uppermost page of the book original BO. Then, the tip of the top page turns the belt 208.
When the center of the lower surface of the sheet is crossed, the turning belt 208 and the page feed roller 250 move to the position shown in FIG. 3 by the action of a solenoid (not shown). As a result, only the top page 254 of the book document BO is attracted onto the surface of the turning belt 208 by the attraction force due to the non-uniform electric field of the charge pattern formed on the surface of the turning belt 208, and The ends are lifted with the turning belt 208. The attraction force due to this non-uniform electric field is
The feature is that pages other than 54 are not adsorbed.

After flipping up the top page 254 of the book document BO and moving the scanning unit 200 toward its end home position in this state, the top page 254 of the book document BO is shown in FIG. As shown in the drawing, the upper and lower parts 1 arranged on the right side portion of the scanning unit 200 are sandwiched between the turning roller 224 and the page feed roller 250 and are reliably conveyed.
The front end side is sent out to the right outside of the scanning unit 200 after passing between the pair of page guides 227 and 228. At this time, the page turning sensor 214 mounted on the page guide 227 on the upper side of the scanning unit 200 detects the original page sent to the right outside of the scanning unit 200, and the original page is normally sent. Make a decision.

Next, the top page 254 of the book manuscript BO
When the paper is turned up to the binding section, the turning belt 208
Then, the page feed roller 250 is returned to its original position. Then, when the scanning unit 200 is moved toward the end home position in this state, the flipped pages are pulled by the binding portion of the book original BO, and the pair of page guides 227,
While returning between 228, the document is ejected from the scanning unit 200 so as to be superposed on the left page of the book document BO.

In this way, when all of the flipped pages are superposed on the left page of the book document BO, the scanning unit 200 completes one document reading / page turning operation for the spread document.

At the end of the operation of the TPS, the scanning unit 2
00 returns to the central home position (center point of the set book document BO). Therefore, even when the book document BO is set on this TPS, the scanning unit 2
00 is in the central home position. As a result, the book document BO is set with the center of the TPS as a reference, so that when the scanner unit 30 is closed, it is possible to reliably press the center of a book document of any size. Is improved. Further, by setting the book document as the center reference in this way, the page turning for reading the book document is performed on the document table 1.
The control timing when performing the above can be made relatively easy.

In this TPS, the reference set position of the original in the depth direction on the original table 1 and the contact glass 206 is configured such that the front side of the apparatus main body is the abutting reference, and the original table 1 and the contact glass 206 are arranged. This makes it easier to set the originals for. Also, this T
At the start of the operation of the operation unit 200 in the PS, the central HP sensor (not shown) again confirms that the operation unit 200 is in the central home position. Then, when a start signal is sent from the operation panel, the operation unit 200 moves to the left from the center home position and stops at the end home position detected by the end HP sensor (not shown).

FIG. 5 is a block diagram showing the configuration of the electrical system of the system in which the TPS 500 is connected to the printer 501. As described above, the TPS 500 has the scanning unit 200. The scanning unit 200 includes a reading sensor (SBC) 101 including an image reading plate including the above-described CCD, and a V which performs processing of an analog image signal from the image reading plate 101 to A / D conversion.
It has a PU 102 and a carriage 502 including a fluorescent lamp and its inverter power supply, a heater, a thermistor, a fan, a solenoid, and the like. The VPU 102 and the carriage 502 are independent flexible cables, respectively.
It is connected to a PU (image processing device) 103. IPU
Reference numeral 103 includes a frame memory 104 for storing the read image signal. Further, the microcomputer in the IPU 103, via the motor drive circuit 503,
The load such as a stepping motor for scanning the scanning unit 200 and the above-mentioned document table driving DC motor is controlled.

On the other hand, the printer 501 includes the main control board 10
Have 7. The main control board 107 is composed of a main control section for controlling copy mode, fetching key signals from the operation panel 99, and display control, and a sequence control section for controlling copy timing. 10
Reference numeral 5 is a laser diode for performing optical writing in the electrophotographic system.

FIG. 6 is a block diagram showing the flow of data processing in this system. The VPU 102 supplies a drive signal to the CCD of the image reading plate 101, performs correction of the analog output signal from the image reading plate 101 to conversion into a digital signal, and obtains read image data of 8 bits for each dot. Then, the read image data is output to the IPU 103, and the IPU 103 performs processing such as scaling of the image data and high image quality processing of electrophotography. Further, the IPU 103 converts the image data into video data of 4 bits for each dot suitable for writing and stores the processed data in the frame memory 104. The capacity of the frame memory 104 is 400 A
It is 128 Mbits for one page of three sizes.

By the way, as described above, when the document reading operation is started, the scanning unit 200 moves from the central home position to the left end home position in FIG. 2 and travels rightward there from. Then, the optical system of the scanning unit 200 starts the reading operation, reads the document surface from the left page to the right page, and stores it in the frame memory 104. Then, the scanning unit 200
When is moved to the right end of the scanner unit 30, the image reading is completed and the return operation is started. At that time, the right end (the end at the rear end in the sub-scanning direction) of the book document is detected.

Next, the detection of the trailing edge of the book original in the sub-scanning direction by the TPS 500 will be described.

When the scanning unit 200 returns, edge detection is started from the position of the outer frame of the document table 1, and the reading sensor 101 first reads the outer frame of the document table. Next, the black original plate is read, and further the spread end portion of the book original BO is read. Then, the background density, which is the blank area of the top page, is read, and the image is read after the blank area. In general, the edge of the double-spread book document BO is formed by stacking edge groups of pages in an inclined shape as shown in FIG. 7B. Therefore, the edge of the page is shaded by illumination from the direction opposite to the inclination of the edge, and the striped pattern by the edge group of each page of the book document BO is emphasized and read. Therefore, the output from the reading sensor is as shown in FIG. 7a. Output data C continuous from the reading sensor 101 in the sub-operation direction is sampled and compared with a threshold value,
The beginning of the margin of the top page is detected, and its position is determined to be the end of the page.

The detection result of the edge of the book original BO in the sub-scanning direction is used by the microcomputer in the IPU 103 to calculate the page suction position and the page rising position for turning pages.

Next, the detection of the end portion of the book original in the main scanning direction by the TPS 500 will be described. This TPS50
At 0, the end of the book document in the main scanning direction is detected based on the change in the read data of the main scanning one line of the reading sensor 101. That is, as shown in FIG. 8, the left side of the back support plate 14 is aligned with the left side of the binding portion of the double-spread book document BO as a reference, and the front side is aligned as a reference on the document table 1 indicated by the dotted line in the figure. And, as mentioned above,
The scanning unit 200 moves to the right from the left end home position to read the spread original surface of the book original BO. Next, the scanning direction of the scanning unit 200 is reversed, and the page turning operation for the right page is started. At this time, the edge of the book document BO on the right side in the sub-scanning direction is detected. When the right edge position is detected, the microcomputer in the IPU 103 picks up and lifts the page for page turning. The position is calculated, the scanning unit is moved to that position, and then stopped.

The microcomputer in the IPU 103 detects the end portion of the book document BO in the main scanning direction at that position. That is, the double-spread book document BO is set on the front side of the center, and the read data for one line in the main scanning is sampled at the position where the page adsorbing and raising position, that is, the image reading position is definitely on the book document BO in the sub-scanning direction. . The data for one line starts from the position of the black outer frame of the document table on the back side of the maximum book document size.
Next, a black manuscript table and a book manuscript are obtained. Edge detection in the main scanning direction is performed by comparing continuous data in the main scanning direction with a threshold value, and a position where a plurality of pixels in which read image data is larger than the threshold value repeatedly appears,
It is the end position of the book document in the main scanning direction.

In this way, the TPS 500 detects the end of the book document BO and controls the reading by the scanning unit 200. As described above, the image data read by the scanning unit 200 is stored in the frame memory 104, but the IPU 103 outputs only valid image data among the image data stored in the frame memory 104. The calculation of effective image data in the TPS 500 will be described below.

The scanning unit 200 and its page turning operation have been described above. A page storage sensor 415 shown in FIG. 9 is installed on the page conveyance guides 227 and 228 of the scanning unit 200. The page storage sensor 415 is a transmissive sensor, and includes a light emitting diode 4 as a light emitting element.
15a and a photodiode 415b as a light receiving element
It is composed of. The page conveying guides 227, 228 are provided with holes 227a, 228a. As described above, when the page turning operation by the scanning unit 200 is started, the turned page is guided to the page conveying path 418, and the leading end of the page goes out of the scanning unit 200. At this time, the page storage sensor 415 detects the turning page storage start detection timing for detecting the leading edge of the page, that is, the position of the scanning unit 200 at the turning page storage detection position of the page turning guides 227 and 228. , The right edge position of the page when the flipped page is on the book document BO is calculated. Therefore, the page storage sensor 415 detects the page edge of the book document after the page is separated by turning one page, so that the page edge position of the book document in the turning direction (right side in this TPS500) is accurate and reliable. The microcomputer in the IPU 103 calculates and corrects the trailing edge of the image effective range of the book document BO and the next page turning position from the output signal of the page storage sensor 415 (page storage start detection timing).

Further, as described above, when the scanning unit 200 is further moved to the left of the central binding portion after the turned page is stored in the turned page storage section, the turned page becomes the book document BO. It is pulled by the binding section and discharged from the page turning section. The page storage sensor 415 indicates the timing at which this turned-over page starts to be discharged from the page-turning page storage unit.
Detected by. The microcomputer in the IPU 103 detects that the page storage sensor 415 detects the turning page ejection start timing, that is, the position of the scanning unit 200 at the turning page ejection start detection timing. Calculate the end position to ride. Therefore, the page end position of the book document in the turning end direction (on the left side in this TPS500) is accurately and surely detected by turning one page of the book document and separating it, and then detecting the page end. Of the book document BO calculates the leading edge of the image effective range of the book document BO from the position of the page edge in the turning direction of the book document BO and uses it for the next reading resist.

The IPU 103 outputs the valid image data among the image data stored in the frame memory 104 according to the valid image range thus obtained. In the system shown in FIGS. 5 and 6, the IPU 103 sends valid image data to the main control board 107, and printout processing is performed.

By the way, as shown in FIG. 10, the book document BO is set at the center front of the effective reading area V. The effective reading area V is read and scanned from the lower left end in the drawing from left to right in the sub-scanning direction and from bottom to top in the main scanning direction. Then, the read image data of the effective reading area V is stored in the frame memory 104 as described above. Frame memory 10
The size (storage capacity) of 4 corresponds to the image data of the effective reading area V. Therefore, for example, in the case of performing the same-size copying with the system shown in FIGS. 5 and 6, the read image data is stored in the frame memory 104 in the same size, and as shown in FIG. The size of the effective reading area V is the frame memory 10
4 has the same size as the memory area F, and the book document BO
The image data D is stored in the frame memory area F with the same size. Then, as described above, the IPU
Based on the image effective range calculated by 103, the effective image data in the frame memory area F, that is, the image data D of the book document BO is output.

The book original B is obtained by detecting the accurate page edge position of the turning page by the page storage sensor 415.
The detection of the image effective range of O is performed during the page turning operation after reading the first original image. Therefore, the read image data is output after the first page is turned over and the image effective range is detected. Then, the TPS 500 repeats the same operation for reading the second and subsequent sheets, but at that time, the book original BO
Is detected, the image data is not output after the pages are turned over like the first page,
During the return, that is, while turning the pages, the image data is output to improve the productivity.

Further, in the case of performing the reduction copy in the system shown in FIGS. 5 and 6, even if the size of the book original is not known at the time of reading the first image, the entire effective reading area V of the TPS 500 is reduced. Read, store all the read image data in the frame memory 104,
It is sufficient to detect the accurate size of the book original after finishing turning the first sheet, calculate the image effective range of the book original BO, and then output only the effective image data of the image data stored in the frame memory 104. That is, as shown in FIG. 11, when the image data Vs read in a reduced size fits within the frame memory area F, the invalid area M is calculated by calculating the image effective range of the book document BO after finishing turning the first sheet. The book document BO is obtained from the image data Vs.
It suffices to output only the effective image data Ds.

[0037]

However, when performing enlargement copying, the IPU 103 enlarges the entire effective reading area V. Therefore, as shown in FIG. 12, the enlarged effective reading area Vk (hereinafter referred to as an enlarged area). ) Becomes larger than the frame memory area F. At this time,
The image data is stored in the frame memory area F starting from the lower left corner of the enlarged area Vk. Therefore, a part of the image data Dk of the enlarged book document (hereinafter referred to as enlarged data) cannot be completely contained in the frame memory area F depending on the enlargement magnification (the frame memory 10).
4 (over the capacity of 4), that portion (the hatched portion in FIG. 12) will not be stored. Therefore, if image formation or filing is performed in this state, there is a problem that image loss occurs.

It is an object of the present invention to solve the above-mentioned problems in the above-mentioned TPS and to provide an image reading and page-turning apparatus for a book manuscript that does not cause image loss even when the read image is enlarged. To do.

[0039]

SUMMARY OF THE INVENTION According to the present invention, the above-described problem is solved by the present invention, which has a variable magnification function, and sets the book original as the center reference in the sub-scanning direction of image reading, and performs image reading and page turning of the book original. A solution is provided in the apparatus by providing control means for calculating a reading start position of the book document in the sub-scanning direction based on a scaling setting value and a set image size, and controlling to start reading the book document from the calculated position. To be done.

[0040]

The controller calculates the document size from the scaling setting value (scaling ratio) specified by the user and the set image size (image size after the scaling process), and the reading start position according to the document size. To calculate. Then, control is performed so that reading of the original image is started from that position. As a result, the useless reading area is reduced and useless image data is prevented from being stored in the memory. Therefore, it is possible to prevent the image data of the read book document from being stored in the memory and the image loss.

[0041]

Embodiments of the present invention will be described below with reference to the drawings.

The book original reading and page turning apparatus of the present embodiment has the TPS shown in FIGS. 2 to 12 except that the reading start position in the sub-scanning direction is the end position of the set book original. Since the configuration is the same as, the duplicate description will be omitted. In addition, this embodiment is shown in FIG.
6 and 6 will be described as a system in which the TPS 500 is connected to the laser printer 501.

By the way, if the size of the book document BO is not known, the reading start position in the sub-scanning direction cannot be specified. Therefore, in this embodiment, the reading start position in the sub-scanning direction is calculated and determined from the size of the transfer sheet and the image scaling ratio set by the user before copying is started.

The user selects the manuscript table 1 (see FIG. 2) of the TPS500.
(Shown in FIG. 6), the book original BO is set on the scanner unit 30 and the scanner unit 30 is closed. From the operation panel 99 shown in FIGS. ) Is specified. This designation (input signal) is sent from the operation panel 99 to the IPU 103 via the main control board 107. I
The PU 103 calculates (estimates) the size of the book document BO according to the following formula based on this information.

Book original size = transfer paper size ÷ magnification ratio That is, the size of the book original BO in the main scanning direction is 29.
7 mm ÷ 1.41≈210 mm, the size in the sub-scanning direction is 420 mm ÷ 1.41≈297 mm, and it can be estimated that the size of this book document BO is a spread A4 size.

The IPU 103 outputs a control signal to the scanning unit 200 based on the calculation result, and after the scanning unit 200 starts traveling rightward from the end home position, the original image is read from the position R shown in FIG. Start reading. As a result, the enlarged data Dk is stored in the memory area F of the frame memory 104 from the reading start point R1.
Will be remembered by. Therefore, the expansion area Vk is larger than the memory area F, but all the expansion data Dk is stored in the memory area F of the frame memory 104. Therefore, the image is not lost even when the enlarged copy is performed.

When reduction copying is performed in this system, the effective image area of the book document is calculated and the memory area F of the frame memory 104 is used, as described in the description of the conventional example.
Although it is possible to output only the effective image data from, the invalid area M (shown in FIG. 11) in the frame memory area F is calculated from the effective image area of the book document, and the reading start position from the memory area F, that is, the memory address. It takes time to calculate. Therefore, in this embodiment,
Even when the reduction copy is performed, the reading start position in the sub-scanning direction is calculated from the size of the transfer sheet and the image scaling ratio set by the user before the copy is started, as in the case of performing the enlargement copy.

For example, transfer paper size A4 (210 mm ×
297 mm), if the reduction copy 82% (both main and sub-scanning directions) is specified, the size of the original in the main scanning direction is 210 mm ÷ 0.82≈256 m from the above formula.
m, and the size in the sub-scanning direction is 297 mm ÷ 0.82
≈362 mm, and it can be estimated that the size of the book document BO is a spread B4 size. Therefore, it is possible to quickly calculate the reading start position by the TPS 500, read the first document image, quickly output the image data, and speed up the process.

[0049]

As described above, according to the book document image reading and page turning apparatus of the present invention, the scaling setting value and the set image size set by the user before the book document reading operation is started. Since the reading start position is calculated from and the reading of the book document is started from that position, it is possible to prevent image loss when the read image is enlarged.

Further, the processing can be speeded up even when the reduction processing is performed.

[Brief description of drawings]

FIG. 1 is a diagram showing a reading start position and storage of image data in a memory during enlargement processing by a book original image reading and page turning apparatus according to an embodiment of the present invention.

FIG. 2 is a block diagram showing an example of an image reading and page turning apparatus (TPS) of a book document to which the present invention is applied.

FIG. 3 is a side view illustrating a page turning operation by the TPS.

FIG. 4 is a side view illustrating a page turning operation by the TPS.

5 is a block diagram showing a configuration of a system in which the TPS shown in FIG. 2 is connected to a laser printer.

FIG. 6 is a block diagram showing a data processing flow in the system.

7A and 7B are diagrams illustrating detection of an end portion of a book document in the sub-scanning direction in the TPS shown in FIG. 2, where a is a graph showing output data of the reading sensor and b is a spread end of the book document. It is a side view which shows the part vicinity.

FIG. 8 is a diagram for explaining edge detection of a book document in the main scanning direction by the TPS shown in FIG.

9 is a side view showing a page sensor for obtaining the image effective range of a book document in the TPS shown in FIG.

FIG. 10 is a diagram for explaining a reading start position in the TPS shown in FIG. 2 and storage of image data in a memory during equal-magnification processing.

11 is a diagram illustrating storage of image data in a memory during reduction processing in the TPS shown in FIG.

12 is a diagram illustrating storage of image data in a memory during enlargement processing in the TPS shown in FIG.

[Explanation of symbols]

1 Document Plate 30 Scanner Unit 35 Document Plate Unit 103 IPU 104 Frame Memory 200 Scanning Unit 500 TPS 501 Laser Printer BO Book Document D Book Document Image Data Dk Book Document Enlarged Image Data Ds Book Document Reduced Image Data F Frame Memory Area M Invalid area R Reading start position R ₁ Reading start position in enlarged image data V Effective reading area Vk Enlargement effective reading area Vs Reduction effective reading area

Claims (1)

[Claims] 1. An image reading and page-turning device for a book document, which has a variable magnification function and uses the set reference of the book document as a center reference in the sub-scanning direction of image reading, and starts reading the book document in the sub-scanning direction. An image reading and page-turning apparatus for a book document, comprising a control means for calculating a position based on a variable magnification setting value and a set image size, and controlling to start reading the book document from the calculated position.