JPH0754960B2 - Image processor - Google Patents

Description

The present invention relates to an image processing apparatus for processing a document image.

[Conventional technology]

2. Description of the Related Art Conventionally, there has been considered a copying apparatus having a so-called page continuous shooting function, which copies an image of a document placed on a document table by dividing it into left and right halves.

[Problems to be solved by the invention]

In such a copying apparatus, scanning is performed on the right side and the left side of the document on the assumption that the document is placed on the basis of the reference position of the document table. The divided areas of the document are also displaced, and there is the inconvenience that the desired image cannot be obtained.

Further, in order to prevent such an inconvenience, the original must be placed accurately, and the operability becomes poor.

[Means for Solving the Problems]

The present invention has been made in view of the above points, and a document table on which a book document in a spread state is placed, a scanning unit for scanning the book document placed on the document table, and a scanning unit for scanning the book document. A reading mode for reading an image on the platen including a document and outputting an image signal, and a book mode for scanning the right page and the left page of a book document placed on the platen by the scanning means, respectively. Setting means for detecting the positions of the leading edge and the trailing edge of the book document on the document table in the document scanning direction of the scanning means based on the image signal output from the reading means; When the book mode is set by the setting means, the center position of the book original is determined according to the positions of the leading edge and the trailing edge of the book original detected by the detecting means. Image processing having determining means for determining scanning positions of the right page and left page by the scanning means, and control means for controlling the scanning means according to the scanning positions of the right page and left page determined by the determining means A device is provided.

〔Example〕

 Hereinafter, the present invention will be described based on examples.

In this embodiment, the original is illuminated by the light source, and the reflected light that becomes the original image is not directly projected onto the photoconductor but is projected onto the photoelectric conversion element to obtain the original image as an electric signal. Then, this electric signal is processed by circuit means and software means to continuously enlarge / reduce the original image to an arbitrary magnification, extract an arbitrary area of the original image, or separate this area. To any area of the
Multi-functional image processing capabilities, such as combining two functions, enlarging / reducing an arbitrary area of the original image to an arbitrary magnification and moving it to an arbitrary place, and the image information processed in this way to a distant place. The apparatus of this embodiment has a function of transmitting. Further, although some image processing methods using the image memory means have been proposed in the related art, the apparatus of this embodiment does not require the memory means by performing the above processing in real time while scanning the original image. It means that there is a wide cost reduction.

FIG. 1 shows the appearance of a copying apparatus according to the present invention. This device is basically composed of two units. A reader A and a printer B. The reader A and the printer B are mechanically and functionally separated from each other so that they can be used independently. The connection is designed to be made only with an electric cable. The operation unit A-
1 is attached. Details will be described later.

FIG. 3 shows a structural sectional view of the reader A and the printer B. The document is placed face down on the document glass 3 corresponding to the document table of the present invention, and the placement reference is on the left back side when viewed from the front. The document is pressed onto the document glass 3 by the document cover 4. The original is illuminated by the fluorescent lamp 2, and an optical path is formed so that the reflected light is condensed on the surface of the CCD 1 corresponding to the reading means of the present invention via the mirrors 5 and 7 and the lens 6. The mirror 7 and the mirror 5 are adapted to move at a relative speed of 2: 1. These fluorescent lamp 2, mirrors 5 and 7 correspond to the scanning means of the present invention. This optical unit moves from left to right at a constant speed while applying a PLL with a DC servo motor. This moving speed is 180 mm / sec on the forward path irradiating the original, and 468 mm / s on the return path.
ec. The resolution in the sub-scanning direction is 161ines / mm. The size of the manuscript that can be processed is from A5 to A3, and the placement direction of the manuscript is that A5, B5, and A4 are vertically placed, and B4 and A3 are horizontally placed. Three optical unit return positions are provided according to the size of the original. The first point is 220 mm from the original reference position for A5, B5 and A4, the second point is 364 mm for B4, and the third point is 431.8 mm for A3.
It is as a place.

Next, with respect to the main scanning direction, the main scanning width becomes a maximum A4 horizontal width of 297 mm depending on the document placing direction. Then, in order to resolve this at 16 pel / mm, the CCD bit number is 475
2 (= 297 × 16) bits are required, so 2628
Two bit CCD array sensors were used and they were driven in parallel. Therefore, from the conditions of 161ines / min and 180mm / sec, the main scanning period (= CCD accumulation time) is Becomes CCD transfer rate Becomes

Next, referring to FIG. 3, an overview of the printer B placed under the reader A will be described. The bit-serial image signal processed by the reader A is input to the laser scanning optical system unit 25 of the printer B. This unit 25 is a semiconductor laser, collimator lens, rotating polyhedral mirror, F
It consists of a θ lens and a tilt correction optical system. The image signal from the reader A is applied to a semiconductor laser and converted into electric light, and the diverging laser light is collimated by a collimator lens to be parallel light, which is applied to a polygon mirror that rotates at high speed, and the photoconductor 8 is scanned with the laser light. To do. The rotation speed of this polyhedral mirror is 2,600 rpm. The scanning width is about 400 mm, and the effective image width is 297 mm, which is the A4 horizontal dimension. Therefore, the signal frequency applied to the semiconductor laser at this time is about 20 MHz (NRz). The laser light from the unit 25 is incident on the photoconductor 8 via the mirror 24.

The photoconductor 8 is, for example, a conductive layer-photosensitive layer-insulating layer 3
Consists of layers. Therefore, the process components are arranged which allow it to be imaged. 9 is a static eliminator,
10 is a pre-electrification lamp, 11 is a primary charger, 12 is a secondary charger,
13 is a front exposure lamp, 14 is a developing device, 15 is a paper feed cassette,
Reference numeral 16 is a paper feed roller, 17 is a paper feed guide, 18 is a registration roller, 19 is a transfer charger, 20 is a separation roller, 21 is a conveyance guide, 22 is a fixing device, and 23 is a tray. The speed of the photoconductor 8 and the transport system is 180 mm / sec, which is the same as the forward path of the reader. Therefore, the speed at which a copy is made by combining the reader A and the printer B is 30 sheets / minute at A4. Further, since the printer B uses the separation belt on the front side to separate the copy paper that is in close contact with the photosensitive drum 8, the image corresponding to the belt width is lost. If you put a signal on that width as well, it will be developed, and the toner will stain the separation belt and stain the paper after that.
In advance, the leader side cuts the video electric signal of the print output to the separation belt width of 8 mm. or,
When fixing the toner on the edge of the copy paper,
Since the fixing roller of the fixing device 22 is wrapped around the fixing roller and causes a jam, the electric signal is also cut on the reader side so that the toner does not adhere to the width of 2 mm of the leading edge of the paper. Next, FIGS. 14-1 and 14-2 show the main scanning direction of the reader A and the printer B and the output image. Leader from the back to the front,
The printer performs main scanning from the front side to the back side.

The copying apparatus of this example has an intelligence such as image editing, but this intelligence is processed by the reader A side by processing the signal read by the CCD 1, and at any stage when output from the reader A. However, a certain number of bits (47
At 52), a constant speed (13.89MHz) signal is output. The function of the intelligence is to zoom in / out to any magnification within a range of 0.5 → 2.0 times, or a specific magnification,
There is a trimming function for extracting an image only from a designated area and a moving function for moving the trimmed image to an arbitrary place on the copy paper. In addition, there is a function to perform halftone processing with 32 gradations by specifying a key. Furthermore, it has a composite function combining these individual intelligent functions. First
Figure 16 shows specific examples of these.

(A) shows the editing function, (1) shows the front side of the document, (2) shows the state when copying is completed when only the trimming coordinates are specified, and (3) specifies the trimming coordinates + move coordinates. (However, when the error is displayed when the copy paper size is exceeded), (4) is when the trimming coordinate designation + movement coordinate designation + enlargement by an arbitrary magnification (however, when the copy paper size is exceeded, an error is displayed) In (5), when trimming coordinate designation + move coordinate designation + reduction of arbitrary magnification is performed, (6) trimming coordinate designation + AUTO designation (0.5
→ (7) shows the state at the completion of copying when the trimming coordinate designation + AUTO designation is performed when the magnification is changed from the reference position according to the cassette size direction at a magnification of 2 times. The trimming coordinates to be shifted to the moving coordinates are determined based on the coordinate point having the smallest value in the sub-scanning direction.

(B) shows the relationship between the CCD and the main scanning direction of the laser, and (c) shows the method for designating trimming coordinates.

If it is a single line surrounded by straight lines, the specified order is ~
Do as follows. This coordinate designation is performed using the numeric keypad 12a shown in FIG.

FIG. 2 shows a transparent holder A-2 that can be sandwiched between the original cover 4 and the glass 3, and this holder has a bag-like shape in which two sides are stuck together so that an original can be stored. It has the same size as the surface. Then, one of the bag holders has a sectioned line as shown in the figure, and the periphery of the bag holder has vertical, horizontal 1 or 1-n, 1-m coordinates at 5-10 mm intervals. . Each coordinate point corresponds to each point on the glass 3. Therefore, when the document is sandwiched in the bag holder with the image plane of the document facing the coordinate plane, it can be visually confirmed that the image plane of the document is indicated by the coordinates. Therefore, the trimming coordinates and the moving coordinates in FIG. 15 (c) can be input by operating the keys of the operation unit A-1 while visually checking the holder. After inputting, the image surface of the document is turned over and stored again in the bag holder and placed at a prescribed position on the glass 3 surface, or the document is removed from the bag holder and placed. Further, if the coordinates are drawn with a color of a wavelength that the CCD 1 does not respond to, the original can be placed at the reference position on the glass surface while being put in the bag holder. The bag holder may be formed by adhering three sides or one side. With one-sided bonding, that is, a folded sheet structure, coordinates can be designated for thick documents, books, and the like.

FIG. 4-1 and FIG. 4-2 are other concrete network wiring diagrams of the electronic mail system between the head office building and the branch office building. Each reader and printer are connected to a communication control unit (hereinafter referred to as CCU). Called) is connected between them and is connected to the network of the bus structure using the coaxial cable CA as a medium.

In FIG. 4-1, when the reader and the printer are usually connected standalone, the reader connector JR1 and the printer connector JP1 are connected by the cable 401. In FIG. 4-2, when a reader and a printer are connected via a network, once the connection that was conventionally made from the reader JR1 to the printer JR1 is put into JC1 of the CCU, and JC1 '
From JR to JR1. This is to enable the CCU to be connected with the option without changing the hardware of the reader and printer, even though the CCU needs some of the signals between the reader and printer for control. . In addition, since the reader needs to send and receive communication-related commands from the operating unit when it is connected to the CCU, a connector JR2 is provided for that purpose. The operation unit of each reader has keys and display functions relating to communication shown in FIG. Usually this
Since the CCU is stored in the pedestal part of the printer, it is expected that there will be a distance to the place where the communication cable, which is the network cable, is embedded, so a lead-in wire for that is required. It is cable 403 and its connector is JC3. Connected to the network cable is a transceiver module 404 in which a connector for press-contacting the coaxial cable and a modulation / demodulation circuit are integrated. The basic system of this network is a token bus system in which network control is performed on the bus structure by token passing.

Next, the function of the apparatus of this embodiment will be described. In addition to the simple copy function, this equipment also has a scaling function that allows arbitrary enlargement and reduction, an editing function that extracts and deletes any part of the document, and automatically detects the size and position of the document. It has various functions such as automatic scaling and editing. Summarizing the functions for manipulating the images on the original document,
This is called "image operation function". Besides, it is possible to not only copy a document image read by a reader with a connected printer, but also transmit the document image to another printer via a CCU (Comunication Control Unit = communication control unit). Also, the original image sent from another reader can be received by the printer. Such a function is called an "image transfer function". Further, the above-mentioned selected functions can be arbitrarily registered in the six preset keys. The registered content can be arbitrarily designated by the user and is retained even when the power is turned off.

Such a function is called a "preset function". Furthermore, there is a halftone processing function that outputs the image with gradation such as a photo with good reproduction, and an automatic exposure function that removes the background of the original. These are collectively called "image quality processing function". When arranged below, there are the following five image operation functions.

That is, the scaling functions include equal magnification (magnification 100%), standard magnification (size designation), stepless magnification (magnification designation 50 to 200%), and XY magnification (independent scaling in the main and sub scanning directions). . Image inversion functions include original images and negative / positive inversion images. Editing functions include no editing, white masking, and black masking. However, the latter two automatically become XY scaling auto functions, and other scaling functions cannot be specified. White frame trimming,
Black frame trimming and automatic document position detection. However, the scaling, image inversion, movement, and special scaling functions are linked here. The movement functions include no movement, designation of destination, movement of origin (corner), and centering. Special scaling functions include special scaling specification none, scaling auto, and XY scaling auto. However, the latter two other scaling functions cannot be specified. The moving function and the special scaling function are the white / black frame trimming of the editing function,
This is valid only when automatic document position detection is specified.

The screen transfer functions include local copy (normal copy), transmission (transmission of original image to other printer via CCU), reception (reception of original image from other reader via CCU). .

Also, among the preset functions, there are registration (stored in the preset key), reading (reading the stored contents of the preset key), and reset (returning all the functions to the standard mode).

Among the image quality processing functions, there are automatic exposure (AE) and halftone processing.

FIG. 5 is a detailed view of the operation unit A-1 in FIG. 1 and has the setting means of the present invention. This operating part is roughly divided into three blocks. The block on the right is the general-purpose key display section 100 found in conventional copying machines. The central block is a function key / display unit 300 for calling and using the copy transmission function which the user has arbitrarily created and registered by the program. The block on the left side is the soft key display section 20 for the user to freely create a copy / transmission function.
It is 0. The general-purpose key display unit 100 will be described first. Ten
Reference numeral 3 is a 7-segment LED display for displaying the desired number of copies and the number of copies in the middle. Reference numeral 102 is a warning display such as a jam, no toner, no paper, copy interruption, etc. used in a conventional copying machine. Reference numeral 104 is a copy density switching lever and a density display obtained thereby. Reference numeral 105 is a selection display device for manuscript images having only characters, photos only, characters and photos mixed, and section paper. These are provided to perform different image processing so that four types of original images can be copied in an optimized form. 106 indicates whether the selected cassette stage is the upper stage or the lower stage. 107 is a display for displaying the size of the paper stored in the cassette in the selected cassette stage. 108 is a numeric keypad group of 0 to 9 and C, and is an indicator 103.
It is used for entry of numerical values (for example, trimming coordinates, moving coordinates, magnification of magnification change, designation of destination address, etc.) in the process of creating a program on the soft key display 200. Then, 109 entry keys are provided as confirmation keys of the key entry contents displayed on the display unit 200. 110 is an interrupt key for interrupting multi-copy to perform another multi-copy, 111 is a copy cancel key for stopping the multi-copy of the printer B or stopping reception, and 101 is a copy for instructing the printer to start printing or transmission.・ It is a key. Reference numeral 113 is a document image switching key of the selection display 105, and 112 is a cassette stage switching key. Every time the key is turned on, 113 and 112 are selectively shifted from top to bottom. In the function / key display unit 300, a cover is structurally detachable for this portion. As described above, one of the arbitrarily created functions is registered in the soft key display section so that it corresponds to one key of 302, so give a name to the function created by yourself and press the key 302. It is necessary to write it down. Therefore, after registering the function, the cover is removed, the name is written in any of the registered keys 302, and the cover is put on again. As described above, since six function keys 302 are prepared, the user can register six functions.
When the user creates a function on the soft key display unit 200, a message asking whether to register the function on the soft key display unit 202 appears, so if you respond to it with the soft key 201, the function display unit 300 will display. There is 6
All six of the indicators 303 corresponding to these keys perform a blinking operation. This means that the machine asks the operator, "Which function key do you want to register the function?" Therefore, at this time, when the operator presses any key, the indicator corresponding to that key is turned on and the other indicators are turned off. The operator then removes the cover, writes the function name on the key and puts the cover on again. Since the contents registered here are backed up in memory, they will not be erased even if the power switch is turned off. Key 30
1 is a standard mode return key.

On the other hand, the display 114 lights up when the interrupt key 110 is turned on, but blinks in the reception mode on the other hand to notify reception of image data from another station and prevent printing by the copy key 101. During reception printing, data sets and registrations with the key units 200 and 300 are possible. Therefore, copy key 10 is being received during reception after completing printout.
When 1 is turned on, the received contents (source address, total number of received prints, count of received prints) are displayed on the liquid crystal display 202. This display is erased by the clear key C, and the standard mode display or the data set before the copy key 101 is turned on is displayed. When the cancel key 111 is turned on during reception of multi-printing, paper feeding is stopped, the printing cycle for the paper already in the passage is completed, and printing is stopped. The transmission side displays a message on the liquid crystal display 202 indicating the cancellation.

The reader unit will be described in detail. Figure 6-1 shows the system block diagram of the reader unit. The interface signal with this reader is shown on the right. When connecting to the printer, connect the connector JR1 to the connector JP1 on the printer side.
To the connector JP1 on the printer side. When the reader / printer is set and the outside is communicated, the signal that originally goes from the JR1 to the connector JP1 is sent to the communication control unit (CCU).
It is designed to be connected to J1 from JC1 'of the communication control unit (CCU) once. Separately, JR2 and JC2 are connected as protocol signals. The timing of the interface signal of JR1 is shown in FIG. 7 and FIG.
BEAM DETECT signal BD is for synchronizing with the rotation of the scanner when the printer is connected, and corresponds to the tip signal of each line. VIDEO is an image signal, and each line outputs 4752 pixels of 55 ns width. However, one pixel is 3
Up to the value, that is, 0,1 / 2,1 state, so 0 is 55ns width L, 1/2 is 27.5ns in the first half is H and 27.5ns in the second half is L, 55ns width is 1 Become H. This signal is output in synchronism with the BEAM DETECT signal when the printer is connected, and is output in synchronism with the internal pseudo signal when it is not (such as transmission to another). VIDEO ENABLE is a period signal during which the image data is output in 4752 bits. This is also output in synchronization with the BEAM DETECT signal or an internal pseudo signal. VSYNC is a signal output in synchronization with the output of the image leading edge detection sensor 37b and the BEAM DETECT signal or an internal pseudo signal, and means that image data is output from this. The signal width is the same as VIDEO ENABLE. The PRINT START signal is a paper feed command to the printer side. The time interval between PRINT START and VSYNC is determined by the control circuit (FIGS. 10 and 13) in consideration of the magnification and trimming area. PRINT END is a response signal from the print side, which is issued when the trailing edge of the copy paper leaves the photosensitive drum 8 and rides on the conveyor belt 12, and indicates that the printing operation has ended. This detects completion of separation of copy paper, but is issued at sequence timing. AB
The XCONNECT signal indicates that the CCU has been connected. When the CCU is connected, it will drop this pin to GND in its module, which will activate the communication. PRIN
The TER CONNECT signal is output when the PRINTER is connected, and this terminal is connected to GND on the printer side.
As a result, the printing is activated.

S.DATA, S.CLK, CSC BUSY, PSC BUSY, are serial signal lines for making a protocol between the reader A and the printer B (permitting transmission between them, exchanging information such as signaling).

S.DATA and S.CLK are 16-bit protocol data and clock, both of which are bidirectional lines. CSC BUSY
Is output when the reader side outputs data and clock to the line, and PSCBUSY is output when the printer side outputs data and clock to the line. Therefore, these are lines indicating the transmission directions of S.DATA and S.CLK. See FIG. 8 for detailed timing.

Returning to FIG. 6A again, the system block of the reader will be described. The CCD reading units 601, 601 'include a CCD, a CCD clock driver, a signal amplifier from the CCD, and an A / D converter for A / D converting the same. The control signal to the CCD is supplied to the clock driver of the CCD reading units 601, 601 'generated by the CCD control signal generating units 603 and 603'. This control signal is generated in synchronization with the horizontal synchronizing signal BD from the printer B. From the CCD reading units 601, 601 ', the image data converted into 6-bit digital signals are input to the image processing units 602, 602'. In the image processing units 602 and 602 ', a sampling circuit for sampling the CCD output and controlling the light amount of the light source by the CPU 614 corresponding to the determining means and the controlling means of the present invention, a shading amount detecting circuit for the light source, the lens and the like and its correction circuit , The peak hold circuit that detects the peak value of the light intensity in each main scan to perform the AE function, the 6-bit image data after completion of the shading correction based on the peak hold value or the dither pattern of the previous line or the line before the previous line. It has a quantization circuit for determining the slice level and performing binarization or ternarization. Image processing unit 602,60
The image signal quantized in 2'is input to the image editing units 604, 604 '. The image editing units 604 and 604 'have a buffer memory for two lines. The capacity of one line is more than twice the capacity of 4752 pixels per line. The reason for this is that each pixel data is written in the memory by the double sampling plate at the time of 200% enlargement, which doubles the data amount. In addition, the buffer memory for two lines is used because the memory cannot write and read at the same time, so when the image data of the Nth line is being written in the first memory, the N-1th line from the second memory is written. This is because the image of is read. In addition to this, there are a write address counter for writing image data in the buffer memory, a read address counter for reading, and an address selector circuit for switching address signals from these two counters. The counter uses a parallel load type that can preset the initial value.
The CPU 614 is designed to load into the I / O boat. CPU61
According to the coordinate information designated by the operation unit 607, 4 allows the original information to be edited by presetting the address value corresponding to the main scanning coordinate to the counter each time the sub scanning reaches the line corresponding to the trimming coordinate. There is. There is a coordinate area control counter and a gate circuit for enabling white masking, black masking, white frame trimming, and black frame trimming. There is a joint detection shift register for automatic CCD connection. Image data from the image editor first
It is output from 604 and then from 604 ', so the synthesizing unit 605 smoothly switches it to form one serial image data. The recognition unit 606 corresponding to the detecting means of the present invention performs the pre-scanning of the document during the idle rotation period of the printer after the copy button is turned on, and the coordinates where the document is placed at that time, that is, the position of the leading edge of the document in the document scanning direction And the trailing edge position and the leading edge position and trailing edge position of the document in the direction orthogonal to the document scanning direction. This part has a shift register for detecting 8 bits of continuous white image data, an I / O port, and a main / sub-scan counter. The operation unit 607 includes a key matrix, an LED, a liquid crystal, and a liquid crystal driver. Reference numeral 608 is an optical system scanning DC motor, and 609 is a drive circuit thereof. Reference numeral 610 is a fluorescent lamp for illuminating an original, and 611 is a lighting circuit thereof. Reference numeral 612 denotes a photo sensor for detecting that the optical system unit is in the home position.
Is a photo sensor for detecting that the optical system unit is positioned to illuminate the leading edge of the document. The CPU unit 614 consists of CPU, ROM, RAM,
It consists of a battery backup circuit, a timer circuit, and an I / O interface. The CPU unit 614 controls the operation unit 607 to perform the sequence control of the reader in accordance with the operation instruction from the operator and at the same time control the printer with the command. Further, according to a command relating to image processing from the operation unit 607, the image processing units 602, 60 are operated before or during document scanning.
2 ', data is set to various counters in the image editing units 604, 604'. Further, the CPU 614 is a fluorescent lamp lighting device based on the light amount data from the image processing unit before scanning the original.
The light amount control is performed on 611, speed data is preset to the DC motor drive circuit 609 in accordance with the magnification command, and image connection data is collected from the image editing units 604 and 604 'to calculate the connection amount.

FIG. 6-2 is a flow chart of the key control of the operation unit 607 by the CPU 614. When the power switch of the reader is turned on, first, the reset memory, which will be described later, and the RAM are reset (1), and the memory of the liquid crystal display 202 is displayed. Set the same size, no editing, positive, no transmission, and set the lower cassette, text original, and one on the 100 side. That is, the standard mode is set (2). This is the same when the interrupt key 110 and the reset key 301 are turned on. Next, the copy key is discriminated (3), and if not (N), it is discriminated whether or not it is received (4). After setting and registering the mode and data according to 200, 300, it is judged whether or not the printer can print (6), and if possible, the process proceeds to the copy key routine. When the copy key is on, it is determined whether or not to send (8), and if not, the print start signal is output to the CCU (9). At the time of sending, the CCU sends the destination address data and other data necessary for sending. Send (10). In the reception mode, even if the copy key is turned on, transmission and printing are blocked, but the display of the mode data up to that point is saved in the area with the memory, and instead the display unit 20
The received contents are displayed in 2 (11). Press the clear key to return from that display to the original mode data display (12). While the copy key is not turned on, entry by the key units 200 and 300 is possible and its change is also possible (13). When the reception is completed (14), proceed to the copy key routine of step 3,
Make copyable. Cancellation key 11 in step 13
When 1 is turned on, the process proceeds to step 3 after a predetermined time and the reception is stopped. When the clear key is turned on in step 13, the data regarding the number is reset and cleared, but the mode data set by the soft key and the like are not reset. Standardized reset with key 301.

The sequence control will be described with reference to FIGS. 9 and 7. As shown in FIG. 9, there are 3 on the scanning optical system of the reader.
It has individual position sensors 37a-37c. Optical system home position sensor (outputs signal OHP) on the leftmost side when viewed from the front of the reader
, And the optical system is usually stopped at this position. The optical system in which the reader A is driven starts scanning from left to right, and an image leading edge sensor 37b is provided just at the position corresponding to the reference position of the image. When the control circuit detects this sensor 37b, it outputs an image data signal (VIDEO, CLK), and the data valid period (VID) in each main scanning cycle (347.2 μS).
EO ENABLE) is generated. Then, the control circuit starts counting the number of VIDEO ENABLE signals from the sensor 37b, and reaches the count value α corresponding to the first point, the second point, and the third point according to the cassette size or scaling of the printer B. At this time, the optical system forward drive signal is cut off and switched to the reverse drive signal to invert. On the way back, PRINT S
A TART sensor 37c is provided, and when the optical system operates this sensor 37c after reversal, the control circuit determines whether the specified number of copies has been scanned, and if it does not match the specified number of copies, it instructs the printer to feed the next sheet. Generate a PRINT START signal to give. It is necessary to adjust the position of the sensor 37c so that T _{2 in} FIG. 9 becomes equal to T ₁ .

(Variation) Next, a method for enlarging / reducing the original image will be described with reference to FIG. 10-4. The basic idea of zooming is to change the speed of the DC servo motor 37d in the sub-scanning direction. CPU
Calculates the speed based on the magnification input by the key, calculates the PLL frequency corresponding to the calculated speed, and presets it in the I / O latch (1) 58 before scanning. On the return trip, a fixed value is set, which returns the optical system at high speed. This is CPU
The value stored in the ROM of this is preset by this I / O latch (1) 58. Therefore, when magnifying twice, move it at half the speed (180 mm / sec) at the same magnification,
When reducing it to 1/2, it will move at twice the speed. The main scan is a method of sampling the CCD1 serial signal (after A / D conversion) output at a constant frequency at a clock rate according to the magnification. For example, when expanding to 2 times
If sampling is performed at twice the clock rate of the CCD clock, data can be obtained with one bit increase for one bit of the original information, and when it is reduced by half the data of the CCD clock rate.
If sampling is performed at a clock rate of 1/2, 1 bit thinned data can be obtained for 2 bits of original information. The CPU calculates this clock rate based on the input magnification, and sets it in the I / O latch (2) 50 before starting the sub-scan. As described above, the CCD1 has a 2628 bit configuration, of which 36 dummy bits and 2592 effective bits are included. The drive frequency is 7.569 MHz, and the signal line is the φ ₁ clock line 55. The clock φ _{2 for} scaling is based on the same original oscillation and the I / O latch (2) value as φ _1, and the frequency oscillated by the VCO 49 is synchronized by the PLL 48 to φ ₂ to form a variable frequency. There is. The 2592-bit analog signal output from CCD1 is amplified by AMP42 and applied to the AGC (automatic gain control circuit). The AGC43 detects the white level because the white level changes due to long-term changes in the fluorescent light, the background of the document, etc., and clamps the white level so that the relative change from that point can be applied to the A / D converter 44. It is a circuit to do. The output of AGC43 is A / D converted and converted into a binary 6-bit parallel bit. on the other hand,
The dither ROM 54 is set to output the same weight code (6 bits) at 8 bit intervals in the main scanning direction and at 8 bit intervals also in the sub scanning direction, and there are 32 kinds of matrixes of 8 × 8 = 64 bits. Weight codes are assigned. Therefore, different weight codes are output by addressing the dither ROM 54 by the 3-bit main scanning counter 51 and the 3-bit sub-scanning counter 52.
Further, there are a plurality of combinations of weight codes set in this 8 × 8, and it is considered that the reproducibility of the halftone image can be changed by the combination. The selection of this combination is performed by the I / O latch (3) 53, and the presetting to this latch (3) 53 is performed by the CPU before the sub-scanning is started. The main scanning counter 51 is driven by a φ ₂ clock which is a variable frequency depending on the magnification, and the sub scanning counter 52 is driven by a BEAM DETECT signal. Then, the 6-bit weight code from the dither ROM 54 and the A / D converted 6-bit code are compared by the comparator 47 and binarized to obtain a serial halftone reproducible image signal. . Therefore, the meaning of sampling at different clock rates means that the A / D conversion value is compared with the weight code output at the different clock rate. If this comparison is performed at the same rate as φ _1, and if scaling is simply performed by bit thinning and insertion under a certain algorithm, that is normal binary image, but halftone If you do something with a dither in it, the 45 ° dither pattern becomes a pattern of 30 ° or 60 °, or it becomes a staircase, and smooth reproduction cannot be obtained. Therefore, in this example, the rate of the comparator is changed according to the scaling factor.

Next, there are 45 circuits. This is because the conversion time by A / D conversion differs depending on each bit, so it is latched again with φ ₁ to synchronize. Also, as a matter of course, the shift memory 57
The address counter 63 of −1,57-2 is operated with φ ₂ clock. As a result, the shift memories 57-1 and 57-2 contain 2592 bits at the same magnification, 1296 bits at the half magnification,
When doubled, 5184 bits will be included.

The speed of the sub-scanning DC motor 37d is the I / O latch (1) 58 for the CPU.
The pre-set value is input to the VCO 59, and the oscillation frequency thereby is synchronized with the original oscillation and the PLL 60, and is applied to the servo circuit 61 so as to be controlled. The sub-scanning stroke during zooming scans up to the third point (431.8 mm) at any magnification. This is convenient for the area designation for stepless scaling.

(CCD seam correction) A method (automatic scanning direction) of automatically connecting two CCDs 1 and 2 will be described.

As shown in Fig. 11, a white plate is provided over the main scanning width on the home position of the reader (optical system) (on the switch 37a). Normally, when the optical system is at the home position and the light source is turned on, this white plate is provided. Is irradiated, and the reflected light is input to CCDs 1 and 2. Therefore, when the control circuit is in the home position, it corrects the variation in the amount of light and the variation in the sensitivity of the two CCDs 1 and 2 (shading correction). Further, a black thin line Bl having a width of 2 mm and being long in the sub-scanning direction is provided at the center of the white plate. It should be noted that this thin line may have an integral multiple width of quantization. Similarly, when the optical system is in the home position, turning on the light source causes the black thin lines to appear in the bits at the ends of the two CCDs 1 and 2, so the signals from these CCDs 1 and 2 are input to the shift memory. , 128 lower bits of CCD1 system signal and higher 128 bits of CCD2 system signal are compared. And each of these 128-bit data confirms that a white bit always appears before and after, and a black bit is in a sun-deer. And the lower number of white bits and CC of CCD1 series
The number of bits, which is the sum of the number of upper white bits and the number of black bits of the D2 system, is skipped when reading from the CCD2 system shift memory. In the figure
The arrows of CCD 1 and 2 indicate the main scanning direction, and the width arrows indicate the width scanning direction.

The specific method is shown in FIGS. 12 and 13. To write an image signal to the shift memory, the shift memory 57-1,57
-2 uses static RAM, so write address
Counter (write address counter 63) and read address counter (read address counter 64,6)
5) is provided. Since the amount of information input to the CCD differs for each magnification ratio, in this example, the write address
The counter (1) is counted up from the LSB by the input clock φ ₂ , and it is confirmed at what count it stopped. This is stored in the RAM of the CPU. If it was 1x magnification, it should stop at 2592 counts. Next, in order to take out the upper 8 bits of the CCD1 system (the first bit that appears in the main scan is the MSB) and the lower 8 bits of the CCD2 system, C
Set the above confirmed value to the write address counter of CD1 system and 08H to the address counter of CCD2 system.
Set (hex code 08) and specify the down count mode. On the other hand, 8-bit shift registers 74 and 76 for inputting image signals from each CCD are provided, and the drive period of these shift registers 74 and 76 is VIDE indicating the main scanning period of the CCD.
From the rising edge of the O ENABLE signal, the counter (VIDEO EN
It moves according to the clock output during the ABLE period. ), The image signal of the highest 8 bits of the CCD1 system remains in the shift register 74 of the CCD1 system and the image signal of the lowest 8 bits remains in the shift register 76 of the CCD2 system. Then, the values remaining in these shift registers 74 and 76 are read by the CPU and stored in the memory. Then CCD1
In order to fetch the upper 9 to 16 bits of the system and the lower 9 to 16 bits of the CCD2 system, the write address counter of the CCD1 system is set to (the above confirmed value -8) and the write address of the CCD2 system is set.・ Set 10H to the counter and read it by the same method as above. This operation is repeated one after another, and the upper 128 bits of the CCD1 system and the lower 128 bits of the CCD2 system are expanded in the memory, and then the number of black bits, the number of lower white bits of the CCD1 system, and the number of upper white bits of the CCD2 system are calculated. Then, the number of lower white bits of CCD1 system, the number of upper white bits of CCD2 system, and the number of bits of black bit are added to the shift memory of CCD2 system (2) 57.
The thinning-out at the time of reading from -2 achieves the joint in the main scanning direction.

Next, the operation of the shift memory after the succession logic is established will be described. When writing to the shift memories 57-1 and 57-2, the write address counters of the CCD1 system and the CCD2 system are pre-set with the value which is confirmed at the above-mentioned count, and down written.
Address and write shift memory by count. The first consideration in reading from the shift memory is the reference in the main scanning direction of the document. As shown in Fig. 11, the document placement standard is a black thin line (1.5 mm
Since it is located 148.5 mm from the center of the (width), the read start address of the CCD1 system shift memory (1) 57-1 is (the lower number of lower white bits) + (the number of black bits / 2) +
The value is (148.5 x 16 x magnification). The read start address of the CCD2 system is the value of (the above confirmed value)-(the number of joint bits). Then, by reading the 4752 pulse at 13.89 MHz, the read address counter (1) 64 of the CCD1 system is down-counted first, and when it becomes 0 and a ripple is detected, the read address counter of the CCD2 system (2). Move 65 down count.

FIG. 13 shows a circuit diagram of these shift memories. The shift memory (1) 57-1 is a static memory in which CCD1 image data is stored. Shift memory (2) 57
Reference numeral -2 is a static memory in which CCD2 image data is stored. The write address counter (1) 63 is an address counter for writing data in the shift memories (1) 57-1 and (2) 57-2. The read address counter (1) 64 is an address counter when reading data from the shift memory (1) 57-1, and the read address counter (2) 65 is the shift memory (2) 57-2. This is the address counter when reading from. Address selector (1) 71 is a write address
Counter (1) 63 address signal and read address
This is for selecting any one of the address signals of the counter (1) 64 and addressing the shift memory (1) 57-1.
Address signal of address counter (1) 63 and read
This is for selecting any of the address signals of the address counter (2) 57-2 and addressing the shift memory (2). The shift register 74 is a register for taking out the image data of the CCD1 system from the lowest 8 bits at a time, and the shift register 76 is the register 8 from the highest position of the CCD2 system.
This is a register for extracting image data bit by bit. F / F73 is set at the rising edge of the VIDEO ENABLE signal,
The write address counter (1) 63 is for flip-flop (F / F) reset by the ripple carrier to control the period to be input to the shift register 74, and F / F75 is the rising edge of VIDEO ENABLE. An F / F that is set and reset by the ripple-carrying of the read address counter (2) 65 is for controlling the period input to the shift register 76. I / O port 72 is light
This is an I / O for the CPU to read and confirm to what extent the address counter (1) 63 is counted when it is moved up. The I / O registers 66, 67 and 69 are registers for the CPU to give preset values to the write address counter (1) 63 and the read address counters (1) 64 and (2) 65, respectively. The I / O register 68 uses the write address counter (1) 63 and the read address counter (2) 65 as the CP for counting up or down.
For U to specify, address selector (1) 70,
(2) For the CPU to specify which counter value to select for 71, read address counter (2) 65
CP to send the image data for one line from the CCD driver circuit to the shift memory circuit by giving a test signal when performing the splicing and for deciding whether to move with the write clock or the read clock.
It is for U to control.

With reference to this circuit diagram, the operation of extracting the CCD1 type image data by 8 bits from the lowest order and the CCD2 type image data by 8 bits from the highest order by 128 bits in order to perform the connection will be described.

The CPU first sets the write address counter (1) 63 to the up count mode and sets the I / O register (1) 66 to 0. By giving one pulse as the TEST signal (corresponding to machine start) of I / O register (4) 68, one VIDEO ENABLE from the CCD driver in Fig. 10 and φ ₂ clock according to the magnification are generated, and the data Are provided to the shift memories (1) 57-1 and (2) 57-2. I / O port 7
The CPU fetches the value of write address counter (1) 63 from 2. The write address counter (1) 63 is set to the down count mode, the read address counter (2) 65 is set to the down count mode, the value stored in the I / O register (1) 66 is preset, and I 7H is preset in the / O register (3) 69. 1 for TEST signal
When VIDEO ENABLE disappears, 8 bits of shift registers 74 and 76 are sequentially fetched and stored in the memory. Set I / O register (1) 66 (value of −7H) to I
Set 10H to / O register (2) 67. I do.
Similarly, I / O register (1) 66 (value of -77
H) until 7FH is set in the I / O register (2) 67, the TEST signal is given, and the shift registers 74 and 76 are read. Regarding the above seam correction, Japanese Patent Application No. 57-1280 by the same applicant
Details in No. 73.

FIG. 15 illustrates a method of performing image editing in which a trimmed image is scaled to an arbitrary magnification with an arbitrary point as a reference.
FIG. A is a document surface, FIG. B is an enlarged view, and C is a shift diagram.
The basic method of image editing is to calculate the edited coordinate value by the coordinate value of the trimming area, the moving coordinate value, and the magnification (FIGS. A to C). From the coordinate value of the trimming area, the minimum coordinate value (x) in the main scanning direction and the coordinate value (y) in the sub-scanning direction (from the original placement reference) are selected.
The CPU judges and sets it as x ₀ , y ₀ . Since the coordinates are entered by the key in mm, and because it is 16 lines / mm, the number of lines L ₀ of the y ₀ coordinate is (y ₀ × 16). The information amount I _{0 at the} x ₀ coordinate is (x ₀ ×
16) (Fig. A). The CPU determines the smallest one in the x-direction and the y-direction from the edited area coordinate values and sets them as x ₁ and y ₁ (C
Figure). Based on x ₀ , the magnification and x ₁ , the preset value of the read start address in the read address counter to be read from the shift memory is determined (calculation of address A3 in FIG. C). This point will be described in detail with reference to FIG. 15-I. This is a shift memory, and there is a bit (4752 x 2) to be used for double expansion. When simply enlarged, the amount of information in memory is I ₁ (x ₀ × magnification × 16) bits. Further, the address A ₁ of the shift memory according to the magnification of the x ₀ coordinate is (A ₁ −I ₁ ). Note that A ₁ is the head address of the memory and is stored in the RAM during CCD connection correction. By the way, the number of lines L ₂ according to the magnification of the y ₀ coordinate is (L ₀
× magnification). Next, the shift memory is read in order to output this enlarged image to x _{1 from} the shift point, and the start address A ₃ is obtained, which is A ₂ + I ₂ . Note that I ₂ is the amount of information corresponding to the shift coordinate x ₁ and is (x ₁ × 16). By the way, the number of lines L ₁ of the y ₁ coordinate is y ₁ × 16.

Next, from the generation of the PRINT START signal described above to the start of the optical system based on y ₀ , magnification and y ₁ , or VSYN
Determining the time interval until K generation (calculation of L _3). That is L ₁ −L
₂ corresponds to that. When this difference is + L ₃ , the START signal or
Based on the VSYNK signal, L ₃ × main scan cycle (347.2μ
S) Get out early. When -L ₃ , the START signal or VSYNK signal is output later than the above. In order to output the image only to the editing area, a start bit counter and an end bit counter are provided to gate only a part of the image data in the main scanning direction. This corresponds to 80 and 81 in FIG. 13, respectively. This presets the count data for the gate via I / O. The flip-flop 82 is set by the count-up of the counter 80 and reset by the counter 81. First
The operation is shown in FIG. 15-G. The number of lines between the change points in the sub-scanning direction is calculated from the coordinate value of the trimming area and the magnification (D, E, F diagrams). This is done by counting VIDEO ENABLE in the CPU. In the figure, M is the number of lines between the changing points in the sub-scanning direction, H is the number of bits in the main scanning direction, and N is the number of lines between the changing points in the sub-scanning direction when scaling (N = M × magnification).

The preset values of the start bit counter 80 and the end bit counter 81 at the point of change from the edited x-direction coordinate value are calculated and set as shown in FIG. 15-H.

Even when the image is output on the entire surface without trimming, the start bit counter 80 and the end bit counter 81 are used as the leading end margin and are used for creating the margin.
At initialization, the same as above, but after counting 2mm x 16 lines = 36 lines in the leading edge margin, set the start bit counter 80 to 7.5mm x 16 bits = 120 bits to avoid the separation belt hanging width.

Fig. 10-1 shows the structure for correcting the shading of the original illumination light source and the lens. The shading correction is performed in the following sequence for each copy when the optical system is at the home position. First, turn on the fluorescent lamp,
Illuminate the standard white or gray plate in the main direction of Bl width in Fig. 11,
The reflected light is input to the CCD. At this time, the switch 701 is set to the 1 side in the circuit and the signal photoelectrically converted from the CCD is AM.
P, A / D converted. Then, the data is sampled every 8 pixels and written in the RAM 702. The reason for doing so every 8 pixels is to reduce the memory capacity of the RAM 702.
Therefore, based on the shading of a certain pixel, the adjacent 8
Pixels (including white pixels) are corrected.

Next, when the optical system shifts to the original scanning, the switch 701 becomes the 2 side, and the image data converted from CCD A / D is input to the sequential multiplication ROM 703 as an address signal and the contents of the RAM 702 are also CCD.
It is read once for every 8 bits of the signal and is also input to the multiplication ROM 703 as an address signal. RAM702 for multiplication ROM703
If the input value from is 3/4, for example, CCD in ROM703
The contents of the input value from is multiplied by the value of 4/3 are written. As a result, the multiplication ROM 703 outputs the CCD signal to the correction comparator 705 based on the input value from the RAM 702. In addition, because of the structure, since there is a black thin line for automatic CCD connection in the center of the standard plate, the correction value of this portion is written in the vicinity of that when writing the shaded value in the RAM 702.

In addition, the fluorescent light is stably dimmed by the reflected light from the standard gray plate. That is, the light fluctuation of the fluorescent lamp can be prevented by comparing the A / D output with the reference value and controlling the lighting cycle of the fluorescent lamp. This is done before or after the above shading correction.

Figure 10-2 shows the binarization circuit. The output from the latch (1) 801 and the dither ROM 704 is switched by the selector 803. This is because the CPU selects the output from the dither ROM 704 when there is an instruction input such as a photo original on the operation unit, Latch (1) when there is an instruction input such as a manuscript
This is so that the output of 801 can be selected. When there is an instruction from the operation unit for an instruction such as a text original, CP
U selects the selector 803 to the latch (1) 801, and the peak hold value of the previous or previous main scanning line (Fig. 10-3)
Then, the slice level is determined based on the value of the scanning unit density lever 104 (FIG. 5) and set in the latch (1) 801. This removes the background (AE). When the instruction from the operation unit is a photo original or the like, the CPU sets the selector 803 to the dither ROM 704. At this time, the CPU sets the types of the dithers O to F in the latch (2) 804 based on the value of the operation unit lever 104 and selects the dither type. This differs in the level of dither elements and their arrangement.

The CPU calculates the connection amount of the CCD and connects the image data before scanning the original document, but since the dither pattern also needs to be connected on the left and right, the CPU sets the pre-calculated connection amount to the latch (3) 807. The value of the main scanning counter (1) 805 is offset by that amount. The counter (1) 805 is a 3-bit counter driven by the main scanning clock, and the counter (2) 806 is a sub-scanning clock, for example, V.
It is a 3-bit counter driven by the IDEO ENABLE signal. For this reason, the dither pattern is a maximum of 8 × 8 matrix. The dither ROM 704 is used as RAM, and the CPU
It is also possible to set the matrix elements of RAM according to the input of F.

Figure 10-3 shows the circuit for AE. For removal of the background of the original, the peak value of the image signal from the CCD is detected for each main scanning line. That is, the background of the document should have the largest amount of reflected light when the document is illuminated, so the peak value of the CCD output is detected for each main scanning line (1/16 mm pitch), and at the midpoint between the peak value and the minimum value. You can always remove the background by setting the slice level to. Then, depending on when this slice level is set, the peak value detection is not completed until main scanning is completed, so basically the slice level of the current line is set based on the peak value of the previous line. , Will be set after the main scan of the previous line is completed.
There is no effect on the image.

The image data of the first pixel subjected to the shading correction from the multiplication ROM 703 according to FIG. 10-3 is latched by the latch 904. After the latch, the latch data and the image data of the second pixel are compared by the comparator 705. If the data of the second pixel is larger than the data of the first pixel, port A <B is output and set in the latch 904, otherwise. The first pixel data remains in the latch 904 as it is. After that, if the same method is continued until the end of the main scanning, the maximum value remains in the latch 904. This data is read via the I / O port 906 each time main scanning is completed. After this, the CPU immediately determines the slice level and sets it in the latch (1) 801 in FIG. 10-2.

Next, the operation of the detecting means of the present invention will be described.

In FIG. 17-1, the document 300 is placed on the platen glass 3 of the reader A.
Indicates the state where is placed. Basically, the placement position is fixed as described above, but it can be placed diagonally as shown in the figure. In this case, when the main scanning direction from the reference coordinates SP on the original glass 302 is X and the sub-scanning direction (corresponding to the original scanning direction of the present invention) is Y, the coordinates of four points (X ₁ , Y ₁ ), ( X ₂ , Y ₂ ), (X ₃ ,
_{Y 3), (X 4,} Y 4) and during pre-rotation operation period of the printer, is detected by prescan optics. This makes it possible to determine the size and position of the document. As a result, it is possible to determine the skiyanski stroke during multi-copy and select a desired cassette. The original cover 4 (FIG. 2) is mirror-finished so that the image data outside the area where the original is placed is always black. In the sub-scanning, the main scanning and the sub-scanning are performed so that the entire glass surface is scanned, and then the scanning for printing is subsequently performed. This sub-scanning speed is faster than during printing.

FIG. 17-2 shows the details of the recognition unit 606 corresponding to the detection means of the present invention. Image data VIDE binarized by pre-scan
O is input to the shift register 301 in units of 8 bits.
When 8-bit input is completed, the gate circuit 302 checks whether all 8-bit data are white images, and if Yes, outputs 1 to the signal line 303. After scanning the original,
F / F304 set when the first 8 bit white appears. This F / F 304 has been previously reset by VSYNC (image leading edge signal). After that, the set is released until the next VSYNC comes. When the F / F 304 is set, the value of the main scanning counter 351 (main scanning counter 805 or dedicated counter in FIG. 10-2) at that time is loaded into the latch F / F 305. This becomes the X coordinate value. Further, the latch 306 is loaded with the value of the sub-scanning counter 352 (sub-scanning counter 806 or dedicated counter shown in FIG. 10-2) at that time. This is the Y ₁ coordinate value. Therefore, P ₁ (X ₁ , Y ₁ ) can be obtained.

The value from the main scanning counter 351 is loaded into the latch 307 each time 1 is output to the signal 303. This value is immediately (next 8
The bit is stored in the clutch 308 before entering the shift register 301. When the value from the main scan when the first 8 bits of white appears is loaded into the latch 308, the data of the latch 310 (which is set to “0” at the time of VSYNC) is compared in magnitude with the comparator 309. It If the data of the latch 308 is larger, the data of the latch 308, that is, the data of the latch 307 is loaded into the latch 310. At this time, the value of the sub-scanning counter 352 is loaded into the latch 311. This operation is processed until the next 8 bits enter the shift register 301. When the data comparison between the latch 308 and the latch 310 is performed for all the image areas in this way, the maximum value in the X direction of the original area remains in the latch 310, and the coordinates in the Y direction at this time remain in the latch 311. This is the P ₃ (X ₃ , Y ₃ ) coordinate.

The F / F 312 is a F / F which is set at the time when the first 8-bit white appears for each main scanning line, is reset by the horizontal synchronizing signal HSYNC, is set at the first 8-bit white, and is held until the next HSYNC. When this F / F312 is set, the main scan counter 35
The value of 1 is set in the latch 313 and loaded into the latch 314 until the next HSYNC. And latch 315 and comparator 31
6 is compared in size. The latch 315 has an X when VSYNC occurs.
The maximum value of the direction is preset. If latch 315
Signal is larger than the data in latch 314, signal 317 becomes active, and latch 314, that is, latch 31
The data of 3 is loaded into latch 315. This behavior is HSYN
It is done between C-HSYNC. When the above comparison operation is performed on the entire image area, the minimum value of the document coordinates in the X direction remains in the latch 315. This is X ₂ . Also, the signal line 31
When 7 is output, the value from the sub-scanning counter 352 is the latch 31
Loaded in 8. This becomes Y ₂ .

The latches 319 and 320 are loaded with the values of the main scanning counter 351 and the sub-scanning counter 352 at that time each time 8 bits of white appear in the entire image area. Therefore, when the pre-scanning of the original is completed, the count value at the time when the last 8-bit white appears appears in the counter. This is (X ₄ , Y ₄ ).
Is.

The above eight latches (306,311,320,318,305,310,315,31
The data line of 9) is the bus line BUS of the CPU in Figure 6-1.
The CPU will read this data at the end of the previous scan.

Then, among these data, the areas of X ₂ , X ₃ , Y ₁ , and Y ₄ are discriminated as the original area, and the above-mentioned trimming processing is performed at the time of scanning the original for printing. That the _{X 2, X 3, Y 1} , Y 4 of coordinate components of the original dotted line surrounding the original position P ₁ to P ₄ can coordinate recognition rectangular, thus the sheet is at least required size corresponding thereto I understand.

Therefore, as a first example, the cassette size data from the printer is compared with the original size data, and the cassette closer to the original size is selected. It depends on the CPU flow as shown in Figure 17-3. Calculate the distance Δy between the coordinates Y ₄ and Y ₁ (step 1), compare if it is smaller than the equivalent of A4 size (step 2), and if it is smaller, select the printer to select A4 cassette The A4C data is output to (step 3). If it is larger and smaller than B4 size, B4 cassette is output, and if larger than B4 size, A3 cassette is output to select (steps 4 and 5). Printer B
According to these data (via the S.DATA line), the CPU on the side compares the size signals already obtained from the two cassettes with each other, and if there is a corresponding one, controls to feed paper from the corresponding cassette. If there is not, data to that effect is sent back to the reader A side to give a warning. The reader A displays that effect. On the printer B side, the paper feed control of the registration roller 18 is performed so that the leading edge of the paper and the coordinate Y ₁ are synchronized.
In the standard mode, the registration roller 18 is operated by the signal VSYNC from the reader A (synchronized with the image sensor 37b), but in this case, as in the case of the above-mentioned trimming shift, this signal and the signal from the image sensor 37b are connected. A time equivalent to Y ₁ is provided. Further, since each cassette is loaded based on the position corresponding to the reference position SP side of the reader, the image output is shifted by X _{1 in the} main scanning direction.
This is performed by the preset method of the read address counter as in the case of the trimming shift. The above-mentioned control mode is selected by the shift key corresponding to the display set by the above-mentioned et cetera key, but it can also be done by providing a dedicated key and inputting it.

As a second example, by inputting the above-mentioned auto command, this portion can be printed with the size changed to fit the cassette sheet. This is because the size signal of the selected cassette of the printer is sent to the reader via the S.DATA line, and this signal is used to perform trimming, shift, and scaling in the order as described above in FIG. You can get a copy. That is, auto 1
As shown in FIG. 17-4, the size of the document in the X and Y directions Px and Py in the X and Y directions is Δx,
The respective ratios mx and my of Δy are obtained (steps 11 to 14).
Then, the one with the smaller ratio is set as the common magnification for X and Y, and R
Set to AM (steps 15-17) and perform the scaling procedure described above. Therefore, it is possible to obtain an auto-variable copy based on one direction of the sheet. As shown in Fig. 17-5, Auto 2 calculates the ratio of the X and Y directions of the document to the X and Y directions of the sheet (steps 21, 22, 24 and 25), and the X and Y magnifications. Are set independently (steps 23 and 26). Therefore, the original image can be copied on the entire sheet. These autos 1 and 2 can also be executed in the same way in auto scaling with the trimming coordinates specified.

As a third example, a document tilt warning can be issued. That is, 17-6
As shown in the figure, check whether X ₁ and X ₂ of P _{1 to} P ₄ are the same as X ₃ and X ₄ , Y ₁ and Y ₃ are equal to Y ₂ and Y ₄ (there is a difference of several bits). Judgment (steps 31 to 34), and if not, a warning is displayed (step 3
6). However, print operation is possible. The above flow chart is a program flow processed by the CPU of the reader.

Incidentally, FIG. 15-L shows a flow chart of the above-mentioned trimming, scaling, and shifting procedures. X ₀ , y only if there is a shift
First, the processing was performed for the ₀ point (Fig. 15-J), but when there is no shift (movement), as shown in Fig. 15-K, x ₀ ′,
y ₀ ′ → x ₅ , y _{5 is used} to set the start bit counter 80,
By controlling the end dot counter 81, the outside of the trimming can be made white. In this case, since the area that can be trimmed is one area surrounded by a straight line, the area to be divided into rectangles in the y-axis direction is specified by specifying two points on the diagonal line in xy coordinates. The maximum value is 3 divisions for the same document. Enter the unit in mm.

So (x ₀ y ₀ , x ₁ y ₁ ) ＋ (x ₂ y ₂ , x ₃ y ₃ ) ＋ (x ₄ y ₄ , x ₅ y ₅ )
The following processes are sequentially performed. In the case of manual shift and automatic, the coordinate conversion is performed and the VIDEO output is controlled as described above.

In FIG. 13, 90 and 91 are exclusive OR gates for determining the image area, OF is a signal for controlling it, and when it is 1, the inside of the frame determined by the ST counter and EN counter is masked and the outside is the output image, 0 In the case of, the inside of the frame is used as an output image and the outside of the frame is masked. 92 is an AND gate that controls the output of the previous image data, and 93 is an AND gate that determines whether the mask is output as black or white.
BB is a signal for controlling it, and outputs black when 1 and white when 0. 95 is an OR gate that outputs the image output output by the gates 92 and 93 as VIDEO, 94 is an exclusive OR gate that controls the black and white inversion of the image data, IN is a signal that controls it, the original raw image when 1 and the original raw image when 0 Invert. For each signal, the CPU uses the shift key
It is output by judging that there is masking, white, black, or negative input.

That is, in the case of mask signal 1, the ST counter is up
When the Q of 82 becomes 1, the output of the gate 90 becomes 0, and the gate 92 does not have the output of the gate 92 until the EN counter is up, that is, Q becomes 0. That is, it is masked. Instead, since the output of the gate 91 is 1 during that time, the gate 93 is 1 when the black / white signal BB is 1, so that the image output gate 95 outputs 1 continuously. That is, it is masked. Conversely, OF =
When 1 and BB = 0, the white mask is applied. When OF = 0, the outputs of the gates 90 and 91 are 1 and 0, respectively, during that time.
When B = 1, the area outside trimming is black, and when OFF = 0 and BB = 0, the area outside trimming is white.

18-1 and 18-2 are explanatory views for moving a small original or an original trimmed product to the approximate center of a sheet for printing (centering), and a determination means and a control means of the present invention. It is a control flow diagram by a corresponding CPU. That is, as described above, the maximum and minimum values (TXMAX, TYMAX), (TXMIN, T) of the trimming coordinates in the shaded area are
Set as YMIN) (1). This can also be set by the coordinate detection described above. Next X, Y that fits the seat
Determine the magnification of the direction. This can be obtained as MX, MY by the method of subroutine auto AT2 (2). It should be noted that MX and MY can be determined for the ten keys as described above in order to select arbitrary magnifications in the X and Y directions, or can be determined by the subroutine AT1. Next, set the length of the sheet in the X and Y directions.
Set to RAM as PS / X, PS / Y. This is determined by the data from the printer (3). The moving coordinates TXM and TYM for centering are obtained using these data (4). That is, the X-direction coordinate TXM can be obtained by subtracting the scaled length of the trimming width in the X direction from the length of the sheet and halving the result. Similarly, the TYM in the Y direction can be obtained. That
Only when TXM and TYM are positive are considered valid, and when they are negative, a warning is issued (5). After that, the above-mentioned Figures 15-A to 15-K
Follow the method shown.

FIG. 19 shows (1) XY scaling, (2) white mask, (3) black mask, (4) white frame trimming, (5) black frame trimming,
Example of (6) White frame trimming + move destination designation + numeric keypad magnification designation, (7) White border trimming + centering + numeric keypad magnification designation, (8) Automatic document position detection + Origin (SP) movement + Auto scaling (AT2) Indicates.

Next, the operation of the determination means and the control means in the book mode of the present invention will be described.

20-1 and 20-2 are explanatory views for printing the right and left pages independently or continuously while the book document is open on the platen and printing it on one or two sheets. It is a control flow figure. First, in FIG. 20-1, the document is scanned forward to determine the document size (X1, Y1) from the detected coordinates as described above (1). This scan is performed and Y1-Y2 width
Invert the optical unit back at the 1/2 coordinate point. That is, the left half is first read, and a half of Y1 corresponding to the position of the leading edge of the document in the document scanning direction of the present invention is printed out (2). Next, the second main scanning unit is set to Y2 corresponding to the position of the rear end of the original in the original scanning direction of the present invention.
Perform the process up to the point and invert and return the optical system. In this case 1/2 to Y2
Print the minutes (3).

In the flow of FIG. 20-2, first, when the book mode is designated by the soft key, the original size detection flag for scanning the size before scanning the copy key is set. Next, whether the requested copy is left only (1), right only (2), both left and right are printed on one sheet (3), or left and right are sequentially printed separately as shown in FIG. 20-1 (4). ,to decide. This is because the CPU determines the soft key input. YM of trimming coordinates for left only
Calculate YMAX with (Y1 + Y2) x 0.5 with IN as Y1. In other words, the center of the book (the stitch) is found (5). Next, the above centering is performed (6). Next, the reversal position P of the optical unit is calculated as (Y1 + Y2) × 0.5 and a slight margin r is added (7). These data are set in RAM. The image of the left half can be printed in the center of the sheet according to the coordinates thus obtained.

In case of right only YMIN of trimming coordinates is (Y1 + Y2) x 0.5
And set YMAX to Y2 (8). Next centering (9)
And inversion P (10) is obtained.

When printing the left and right sheets on the same sheet, the coordinates are obtained in the same manner as in ordinary Y1 and Y2 trimming (11), centering (12) is performed, and the reversal P is obtained (13).

Further, when printing left and right sequentially on different sheets as in the book mode of the present invention, the above-described case of only left and case of only right are sequentially performed to set data (14). That is, 2
Stores data for cycles. When the copy key is turned on, it is determined whether or not it is in BK mode. When BK is selected, the front scan is performed and the coordinate data is stored according to each mode. To
The first sheet is printed by reading from the RAM and performing the preset control of the address counter and the sequencer of the scanner. When the scan ends and returns to the home position, the CPU determines from the RAM data whether or not the (right + left) mode is still set. In this mode, the data for the right side is read and the above control is performed to obtain two cards. Print the eyes.

In the above case, the area other than the original can be made black or white without performing automatic scaling. In each of the above modes, as described above, the start timing of the scanner or the registration timing of sheet feeding on the printer side is delayed or advanced depending on the amount of information due to centering or the like.
Reproduce the image at the proper position.

The manuscript coordinates Y1 and Y2 can be manually input using the ten keys or the size keys. Further, the main scanning direction can be automatically detected and only centering can be performed by X1 and X2 obtained by key input.

In this way, the right and left pages of the book can be printed with proper scaling without moving the book in real time, and the copy operation can be made extremely easy. You can also print on the center of the sheet, and you can cut extra information arbitrarily,
Extremely high copy quality. Further, the printing can be started before the reading by the reader is completed, and the copying speed can be made extremely high in spite of each editing. Further, in the case of the transmission mode to another printer, the image data is sent to the printer attached to the reader at the same time by the command control of the CCU, so that the read image for transmission can be monitored. In addition, after connecting the protocol line and the CPU of the router, the CPU recognizes the situation of each printer terminal, and when the CPU is normal, performs the above various editing and image quality control,
Since the image data is transmitted to a plurality of printers including the attached printer, it is possible to check reproduction quality without error.

〔The invention's effect〕

As described above, according to the present invention, the positions of the leading edge and the trailing edge of the book document on the document table in the document scanning direction are detected based on the image signal from the reading means, and the detected leading edge of the book document is detected. The central position of the book document is determined according to the positions of the rear and rear edges, the scanning positions of the right page and the left page of the book document are determined by the scanning means, and scanning is performed according to the determined scanning positions of the right page and the left page. By controlling the means, no matter where the book document is placed on the document table, the right page and the left page of the book document can be accurately scanned, and desired image processing can be executed.

Further, the operator does not need to pay much attention to the placement of the document, and the operability is improved.

[Brief description of drawings]

1 is a sectional view of an image processing apparatus to which the present invention can be applied, FIG. 2 is a perspective view of a document holder, FIG. 3 is a sectional view of the apparatus of FIG. 1, FIGS. 4-1 and 4- Fig. 2 is a block diagram of a local network to which the device of Fig. 1 is connected, Fig. 5
FIG. 6 is a plan view of the operation section of FIG. 1, FIG. 6-1 is a circuit block diagram of the image processing apparatus of FIG. 1, FIG. 6-2 is a flow chart, FIG. 7, FIG. 8, and FIG. Is the operation time chart of Fig. 6-1, Fig. 10-1, Fig. 10-2, Fig. 10
-3, 10-4, and 13 are circuit diagrams in FIG. 6, FIGS. 11 and 12 are explanatory diagrams of CCD seam correction, and FIG.
FIGS. 4-1 and 14-2 are explanatory views of main and sub scanning, and FIG.
Figures A to 15-F, 15-H, 15-I and 15-
FIG. K is an explanatory view showing the image conversion control, FIG. 15-G is an operation time chart, FIG. 15-J and FIG. 15-L are control flow charts by image editing, FIG. 16 and FIG. 19th
Fig. 17 is an example of image conversion, Fig. 17-1 is an explanatory diagram of coordinate recognition, Fig. 17-2 is a circuit diagram of coordinate recognition, and Figs. 17-3 to 17
FIG. 6 is a control flow chart by recognition, FIGS. 18-1 and 20-1 are explanatory views of another example of image conversion, and FIG.
Fig. 20 and Fig. 20-2 are the flow charts. In the figure, A is a reader unit and B is a printer unit.

 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Nao Nagashima 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Shinobu Arimoto 3-30-2 Shimomaruko, Ota-ku, Tokyo Kya Non-Incorporated (72) Inventor Yoshiyuki Suzuki 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Incorporated (56) Reference JP-A-59-74774 (JP, A) JP-A-57-53769 ( JP, A)

Claims (1)

[Claims] 1. A document table on which a book document in a spread state is placed, scanning means for scanning the book document placed on the document table, and the document table including the document scanned by the scanning means. Reading means for reading an image of the book and outputting an image signal; setting means for setting a book mode for scanning the right page and the left page of a book document placed on the document table by the scanning means; and the reading means. Detecting means for detecting the positions of the leading edge and the trailing edge of the book document on the document table in the document scanning direction of the scanning means based on the image signal output from the scanning means; and the book mode set by the setting means. In the meantime, the center position of the book document is determined according to the positions of the leading edge and the trailing edge of the book document detected by the detecting means, and the right side by the scanning means is determined. Image and a left page scanning position are respectively determined, and a control unit that controls the scanning device according to the right page scanning position and the left page scanning position determined by the determination device. Processing equipment.