JPH07322059A - Picture power varying device - Google Patents

Abstract

PURPOSE:To reproduce one of a vertical direction or a lateral direction by a variable power rate which an operator desires and the remaining direction in such a way that it is stored in the size of a sheet to be reproduced with a minimum operation. CONSTITUTION:When the variable power rate of the vertical direction (main scanning direction) is manually set by an operation part A-1, a CPU part 308 selects the sheet size which is to be reproduced in accordance with the size of an inputted picture. A variable power shift processing part 304 and the driver 311 of a DC servo motor M shifting an optical system are controlled so that the variable power rate of the lateral direction (auxiliary scanning direction) is operated in accordance with the selected sheet size and the size of the inputted picture and that the picture is power-varied with the variable power rate which is set and the variable power rate which is operated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image scaling apparatus capable of scaling and reproducing an image with a scaling factor in which a vertical scaling factor and a horizontal scaling factor are independent.

[0002]

2. Description of the Related Art As a conventional copying apparatus of this type, a variable magnification ratio can be automatically set in each of two directions (a main scanning direction and a sub scanning direction of reading, or a vertical direction and a horizontal direction of an image). There is one in which the operator can specify the scaling factor for each of the two directions.

[0003]

However, in such a conventional copying apparatus, for example, the operator pays attention to one of the directions, and desires only the variable magnification designation in that direction, while the other is accommodated on the recording paper. Even in the case of thinking that it is sufficient, there is a problem that the operation becomes complicated because both the scaling factors are requested.

In view of such a problem, the present invention allows an operator to automatically select an appropriate sheet size by setting a scaling factor in one of the vertical and horizontal directions.
The scaling factor in the remaining one direction should be automatically calculated, and one of the vertical and horizontal directions should be the scaling factor desired by the operator and the other direction should be reproduced with a minimum of operation. It is an object of the present invention to provide an image scaling device which can be reproduced so as to fit within the size of a sheet and has high operability.

[0005]

In order to achieve such an object, the present invention provides an image scaling capable of scaling and reproducing an image with a scaling factor in which a vertical scaling factor and a horizontal scaling factor are independent. In the multiplying device, a sheet to be reproduced according to the setting means for manually setting the scaling factor in either the vertical direction or the horizontal direction, the scaling factor set by the setting means, and the size of the input image. Selection means for selecting a size, and one of the scaling factors in the vertical direction and the horizontal direction, which is not set by the setting means, according to the sheet size selected by the selection means and the size of the input image. And a scaling means for scaling the image by the scaling rate set by the setting means and the scaling rate calculated by the computing means.

[0006]

That is, according to the present invention, the setting is performed by the setting means for manually setting the scaling in either the vertical direction or the horizontal direction, and the scaling ratio set by the setting means and the input image are set. Select the sheet size to be played according to the size of the selected sheet size,
According to the size of the input image, the remaining one of the vertical and horizontal scaling factors that is not set by the setting means is calculated, and the scaling factor set by the setting means and the calculated scaling factor are calculated. Scale the image at a magnification.

[0007]

Embodiments of the present invention will now be described in detail and specifically with reference to the drawings.

(1) Outline of Embodiment FIGS. 1 and 2 are a perspective view and a sectional view showing an embodiment of a copying apparatus of the present invention, respectively.

As shown in FIG. 1, the copying apparatus according to this embodiment includes a reader unit A for reading an original image,
The printer unit B is configured to form the read image on a recording medium such as paper. Further, the reader unit A is provided with an operation unit A-1 described later with reference to FIG.

As shown in FIG. 2, the original is placed with the surface (original surface) on which the image to be read is formed facing down on the original platen glass 3, and is pressed onto the glass 3 by the original cover 4. . The document surface is illuminated by a fluorescent lamp 2, and the reflected light is condensed on the surface of a CCD (charge storage element) 1 as a reading sensor via mirrors 5 and 7 and a lens 6.

The mirror 7 and the mirror 5 are controlled to move in the sub-scanning direction at a relative speed of 2: 1. This is for example DC
If a (DC) servo motor is used as the drive source, PLL
By performing (phase-locked loop) control, it becomes possible to move those optical systems at a constant speed. This moving speed is the forward path (from left to right in the figure) when reading at the same size.
Can be 180 mm / sec (millimeters per second), and the return path (from right to left) can be 800 mm / sec regardless of the magnification.

If the maximum document size that can be processed is equivalent to the A3 size and the resolution is 400 dots / inch (dots per inch), the number of bits constituting the CCD 1 is 4678 (= (297 /
Since 25.4) × 400) bits are required, the CCD 1 in which elements of 5000 bits are arranged is used in this example. The main scanning cycle is as ^{352.7 μsec (= (10 6/} 180) × (25.4 / 400)).

The image signal serially processed by the reader unit A for each bit of the CCD 1 is transferred to the printer unit B.
Is input to the laser scanning optical system unit 25. This unit 25 comprises a semiconductor laser unit, a collimator lens, a rotating polyhedral mirror (polygon mirror), an F-θ lens, a correction optical system and the like. That is, the image signal from the reader unit A is supplied to the laser unit, where it is electro-optically converted, and is radiated to the polygon mirror that rotates at high speed through the collimator lens.
And is scanned.

For the photoconductor 8, as a process component for enabling image formation, a pre-electrifier 9, a pre-electrifier lamp 10, a primary charger 11, a secondary charger 12, a front exposure lamp.
13, developing device 14, paper feed cassette 15, paper feed roller 16, paper feed guide 17, registration roller 18, transfer charger 19, separation roller
20, a conveyance guide 21, a fixing device 22, a tray 23 and the like are arranged. The speed of the photoconductor 8 and the transport system is 180 mm / se.
It is as c. Further, in this example, the printer unit B
Uses a so-called laser beam printer, but other types may be used.

The copying apparatus of this example has intelligence such as image editing, and as its function, an arbitrary changing function of a magnification of 1% in the range of 0.35 to 4.0 times, and extracting an image of only a designated area The trimming function, the moving function of moving the trimmed image to a desired position on the recording medium, the position coordinate detection function of the document placed on the document table glass 3, and the like are described in detail below.

FIG. 3 shows an example of the configuration of the operating section A-1.

Here, 100 is a copy start key for instructing the start of copying, 102 is a copy stop key for instructing to stop the copying operation, 101 is a reset key for returning the copy mode to the standard state, and 103 is "0" to "". This is a setting key provided with a numeric keypad group of 9 ", a" c "key for clearing the set number of copies, and a" * "key used for inputting numerical data such as a trimming area. A density key 108 sets high to low density, and the result is displayed on the display unit 112. 104 and 105 are keys and their displays for turning on / off the document position coordinate detection function, 111 is a copy number display section, 113 is a display section for various error messages,
109 and 114 are keys and their indicators for turning on / off the automatic density adjustment function, and 110 and 115 are
Keys and their indicators for turning on / off the dither processing function when scanning halftone original images such as photographs, 11
6 is a key for selecting the paper feed tray and the automatic paper selection function. The paper feed tray is displayed on the display 117 and the paper size is displayed on the display 118.

An operation display unit 122 has a preset key and a display unit for presetting and calling the copy mode. 123 is a liquid crystal display section composed of, for example, 5 × 7 dot matrix 32 digits, and 124 is a display section.
This is a soft key for selecting a desired mode from the copy modes displayed at 123.

Reference numerals 125 and 126 denote display units for displaying the magnification MY in the sub-scanning direction and the magnification MX in the main-scanning direction, respectively. Reference numeral 127 denotes an equal magnification / magnification changeover key, and each time the key is pressed, both the main scanning direction magnification MX and the sub-scanning direction magnification MY are set to the same magnification (100%) mode and automatic magnification (MX =).
MY) mode is set alternately and repeatedly. Key 128
And 129 simultaneously increase the magnifications MX and MY by 1% each.
Increase or decrease in steps.

Reference numeral 130 is a switching key used for switching between the 100% mode with only the magnification MY in the sub-scanning direction and the automatic scaling mode.
Reference numerals 131 and 132 are command keys for increasing or decreasing only the magnification MY by 1%. Further, 133 is a switching key used for switching between the 100% mode in which only the magnification MX in the main scanning direction is set and the automatic scaling mode, and 134 and 135 are the magnification MX.
Command keys for increasing or decreasing each of them by 1%.

These nine keys 127-129, 130-132
There are seven types of variable magnification functions that can be set by 133 and 135 as described later with reference to FIG.

(2) Reader Unit FIG. 4 shows a system configuration example of the reader unit A.

Here, the CCD reading section 301 has the above-mentioned CCD.
1, clock driver of CCD 1, amplifier of signal from CCD 1, A / D (analog / digital) conversion of it
An A / D converter etc. are provided. This CCD reader 3
Image data converted into a 6-bit digital signal is output from 01 and input to the shading correction unit 302.

The shading correction unit 302 detects the shading amount of the optical system such as the light source and the lens and corrects the image data accordingly, and then supplies it to the shift memory unit 303 to temporarily store it. The shift memory unit 303 is provided with a shift memory for two lines, and when the Nth line image data is being written to the first shift memory, the N−1th line image data is read from the second shift memory. To do so. In addition to the above, the shift memory unit 303 is provided with a write address counter for writing image data in each shift memory and a read address counter for reading, and an address selector circuit for switching address signals from these two counters. There is. The details will be described in detail with reference to FIG.

Reference numeral 304 denotes a scaling / movement processing unit, which is a clock that defines the writing cycle of the image signal to the shift memory,
A clock that defines a read cycle from the shift memory and a read timing are variably set, so that the scaling and movement in the main scanning direction are controlled. The details will be described later.

The image signal output from the shift memory unit 303 is input to the density processing unit 305, where it is subjected to binarization processing or dither processing to become a binary signal, which is output to the trimming processing unit 306. The trimming processing unit 306 forcibly processes any section of the image data of one line in the main scanning direction into “0” and “1” to enable image editing. The details will be described later. The binary signal output from the density processing unit 305 is also input to the document position detection unit 307. Here, the binary signal is used to detect the position coordinate of the document on the document glass 3 as described later.

Reference numeral 308 denotes a CPU unit, which is shown in FIGS.
~ A CPU (central processing unit) that controls each unit according to the processing procedure described later with reference to FIG. 19, and an RO that stores the processing procedure, etc.
It consists of M (read only memory), work RAM (random access memory), timer circuit, I / O (input / output) interface, etc. The CPU unit 308 is further the operation unit A
-1 to control the reader unit A according to the setting made by the operator and the printer unit B by serial communication.

Reference numeral 311 denotes a drive source for moving the optical system.
It is a driver of the DC servo motor M, and the CPU unit 308 presets speed data according to the magnification. 312 is fluorescent light 2
Is a driver for controlling the amount of light when the fluorescent lamp 2 is turned on and off and under the control of the CPU unit 308. 313 and 31
Reference numeral 4 is a position sensor disposed at an appropriate position for notifying the CPU unit 308 of the position of the optical system.

The reader unit A having such a configuration is connected to the printer unit B via the connector JR1 and the connector JP1 on the printer unit B side. Thus, control signals necessary for image data communication and serial communication are exchanged between the reader unit A and the printer unit B. Details will be described later with reference to FIGS. 11 and 12. The horizontal synchronizing signal BD is supplied from the printer unit B through the connector JR1 and the clock generator 30
Entered in 9. The clock generator 309 generates a transfer clock of the CCD signal, a read / write clock of the shift memory unit 303, etc. in synchronization with the horizontal synchronizing signal BD.

(3) Document Position Detection Unit FIG. 5 shows an example of the configuration of the document position detection unit 307. Reference numeral 351 is a main scanning counter for indicating the scanning position in one main scanning line, which is set to the maximum value in the main scanning direction (X direction) by the horizontal synchronizing signal HSYNC and counts down every time the image data clock CLK is input. It can be a down counter. 352 is a sub-scanning counter for indicating the scanning position in the sub-scanning direction, and the vertical synchronizing signal VSYNC
It can be used as an up counter which is reset to "0" at the rising edge of (image leading edge signal) and counts up with the HSYNC signal.

Binary image data VIDEO is stored in the shift register 361 in units of, for example, 8 bits at the time of preliminary scanning (pre-scanning) for determining the reading level and detecting the document position prior to reading the document image. Is entered. When this 8-bit input is completed, the gate circuit 362 determines whether or not all of the 8-bit data is a white image, and outputs "1" to the signal line 363 if the determination is affirmative. That is,
The flip-flop (F / F) 364 is set when the data in which all 8 bits are white appears first after the start of the prescan of the original. The F / F 364 is reset in advance by the VSYNC signal, and the set state continues until the next VSYNC signal is supplied.

When the F / F 364 is set, the value of the main scanning counter 351 at that time is loaded into the F / F 305 as a latch. This is the X ₁ coordinate value. Also, latch 366
Then, the value of the sub-scanning counter 352 at that time is loaded, and this is set as the Y ₁ coordinate value. Therefore, one vertex P ₁ (X ₁ , Y ₁ ) of the original image is obtained.

Further, every time "1" is output to the signal line 363, the value from the main scanning counter 351 is loaded into the latch 367. When the value from the main scan counter when the data with 8 bits of white appears first is loaded into the latch 307, the latch 370 (this is set to the maximum value in the X direction at the time of supplying the VSYNC signal). Data) and the comparator 369. If the data in latch 367 is smaller, the data in latch 367 is loaded into latch 370. At this time, the value of the sub-scanning counter 352 is loaded into the latch 371. This operation is processed until the next 8 bits enter the shift register 361. in this way,
Comparing the data in the latch 367 and the data in the latch 370 for the entire image area, the minimum value in the X direction of the original area remains in the latch 370, and the coordinate in the Y direction at this time is the latch 371.
Will remain. Since the main scanning counter 351 is a down counter, the coordinates corresponding to the minimum value in the X direction represent the coordinates farthest from the origin S _p of the scanning start in the main scanning direction. This is designated as P ₃ (X ₃ , Y ₃ ).

Reference numeral 372 is an F / F which is set at the time when 8-bit white first appears for each main scanning line, which is reset by the horizontal synchronizing signal HSYNC and set by the first 8-bit white data. This state is maintained until the signal HSYNC of is supplied. When the F / F 372 is set, the value of the main scanning counter corresponding to the position of the white signal first appearing in one line is set in the latch 373. Then, the data in the latch 375 is compared with the data in the comparator 376. Latch 375
Is set to the minimum value "0" in the X direction when the signal VSYNC is generated.

If the data in latch 375 is latch 373
If less than or equal to the data in, signal 37
7 becomes active and data in latch 373 goes to latch 37
Loaded at 5. This operation is performed within the supply cycle of the signal HSYNC. When the above comparison operation is carried out for the entire image area, the maximum value of the document coordinates in the X direction,
That is, the X coordinate of the white signal at the point closest to the scanning start point in the main scanning direction remains. Let this be X ₂ . Also,
When signal 377 is output, the value of subscan counter 352 is loaded into latch 378. Let this be Y _2, and P ₂ (X ₂ , Y
₂ ) The coordinates are obtained.

Each time 8-bit white appears in the entire image area, the latches 379 and 320 are loaded with the values of the main scanning counter and the sub-scanning counter at that time, respectively.

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 designated as P ₄ (X ₄ , Y ₄ ).

The above eight latches (366,371,320,378,365,3
The data lines (70, 375, 379) are connected to the bus line BUS of the CPU section 308 shown in FIG. 4, and the CPU section 308 reads the data held in these latches at the end of the prescan.

(4) Shift Memory Unit FIG. 6 shows a configuration example of the shift memory unit 303 in FIG. Note that, as described above, in this example, two shift memories are provided so that writing and reading are performed alternately to improve the processing efficiency, but in FIG. 6, one of them is used for simplification. Only the system related to the shift memory (denoted by reference numeral 907) is shown.

The write address counter 904 is an address counter for writing data in the shift memory 907,
The read address counter 905 is an address counter when reading data from the shift memory 907. The address selector 906 sends a command from the CPU unit 308 to the I / O port 901.
For addressing the shift memory 907 by selecting either the address signal of the write address counter 904 or the address signal of the read address counter 905.

The I / O registers 902 and 903 are the write address counter 904 and the read address counter 905.
, Which is a register for the CPU unit 308 to give a preset value to each.

In this example, both the write address counter 904 and the read address counter 905 are down counters, and WS for instructing the start of the counting operation respectively.
T signal and RST signal are input, and also shift memory
The write clock WCLK to the 907 and the read clock RCLK from the shift memory are input.

915 and 916 are exclusive OR gates for determining the image area, OF is a signal for controlling them, and when the value is "1", the ST counters 912 and EN
The inside of the frame determined by the counter 913 is masked, and the outside of the frame is used as an output image. On the other hand, when "0", the inside of the frame is used as an output image and the outside of the frame is masked.

910 is output from the shift memory 907,
An AND gate for controlling output of image data that has become a binary signal via the density processing unit 908. Reference numeral 917 is an AND gate for determining whether to output the above-mentioned mask portion as white or black, and BB is a signal for controlling it. When the value is "1", black is displayed, and when it is "0", white is Is output.

Reference numeral 911 is an OR gate for outputting the image output output from the gates 910 and 917 as an image signal VIDEO, 909 is an exclusive OR gate for controlling the black and white inversion of the image data, and IN is a signal for controlling the gate 909, which is "1". In the case of, the original image is output, and in the case of “0”, the reverse image is output. The signals OF, BB, and IN are output by the CPU unit 308 according to the mode designated by the operator.

ST counter 912 and EN counter 913
Are a start bit counter and an end bit counter for outputting an image only to a predetermined area, and these are connected to the CPU unit 30 via an interface.
8 presets count data for opening and closing the gate. The F / F 914 is an RS flip-flop that is set when the ST counter 912 counts up and reset when the EN counter 913 counts up.

FIG. 7 shows an example of the operation timing of each part of FIG.

For example, when the OF signal is "1" and the Q output of the F / F 914 becomes "1" when the ST counter 912 counts up, the output of the gate 915 becomes "0" and the EN counter 913 counts up. There is no output from gate 910 until it is masked. On the other hand, since the output of the gate 916 is "1" during that time, the output of the gate 917 is "1" when the BB signal is "1", and the gate 911 outputs "1", which is a black mask. . Conversely, when OF = 1 and BB = 0, the white mask is applied.

When OF = 0, gates 915 and 91
The outputs of 6 are "1" and "0", respectively, during that time. Therefore, when BB = 1, the outside of the trimming range is black, and BB is
When = 0, the outside of the trimming range is white.

(5) Mode of Magnification Change Next, a mode of magnification change will be described.

The scaling in the sub-scanning direction is performed by making the scanning speed of the optical system variable. The CPU unit 308 is the operation unit A
The target rotation speed of the DC servo motor M is calculated from the magnification specified by the operator using -1, and the PLL frequency corresponding to that speed is calculated and preset in the motor driver 311 shown in FIG. 4 before scanning. . That is, if the conveyance speed of the recording medium by the printer unit B is constant, for example, 180 mm / se
If c is set, the rotation speed of the motor M is set so that a scanning speed of 90 mm / sec, which is 1/2 of the scanning speed of 180 mm / sec at the same magnification, can be obtained when the image is magnified twice. The speed of the motor M is determined so that a double speed of 360 mm / sec can be obtained when the speed is reduced to.

Next, variable magnification in the main scanning direction will be described with reference to FIGS. 8 (A) to 8 (D).

The scaling in the main scanning direction is performed by sampling the A / D converted serial signal output from the CCD reading unit 301 at a constant frequency at the clock rate according to the scaling factor as follows.

At the same size, as shown in FIG. 8A, the write clock WCLK equal to the transfer clock CLK from the CCD reading unit 301 is used to write to the shift memory unit 303, and the same drawing is used.
As shown in (B), output clock VCLK to printer B
Read from the shift memory unit 303 with a read clock RCLK equal to.

On the other hand, when reducing to 1/2, for example, the write clock WCLK to the shift memory unit 303 is written at 1/2 of the transfer clock CLK as shown in FIG. One bit is sampled and read by the read clock RCLK that is the same as the output clock VCLK as shown in FIG. 7B, and the reduction of 1/2 is realized.

Further, for example, when the image is enlarged by a factor of 2, when writing to the shift memory unit 303, it is the same as in the case of the same size.
At the time of writing as shown in (A) and reading from the shift memory section 303, as shown in (D) of the figure, if reading at a clock rate of 1/2 of the output clock VCLK to the printer section B, The same signal is added bit by bit for each bit of information, so that double expansion can be realized.

(6) Modes of Image Movement Modes of image movement will be described with reference to FIGS. 9 and 10.

The sub-scanning direction is realized by changing the document image scanning and the output timing of the sub-scanning section signal VSYNC of the image to the printer section B, as shown in FIG.

When the optical system reaches the position with respect to the document M, if the image signal VIDEO is output together with the signal VSYNC, a recording output P1 that does not move is obtained, and when the optical system reaches the position of, the signal VSYNC is output together with the signal VSYNC. When the image signal VIDEO is output, the backward recording output P2 is obtained.
Further, when the signal VSYNC and the image signal VIDEO are output when the optical system reaches the position of, the recording output P3 moved forward is obtained.

FIG. 10 shows the movement of the image in the main scanning direction.
As shown in (A), the I / O registers 902 and 90 shown in FIG.
This is done by relatively changing the down count start address given to the write address counter 904 and the read address counter 905 via 3.

For example, when the read start address is RADR1 for the write start address WADR to the shift memory unit 303, the output VIDEO ENABLE corresponding to the width of the image in the main scanning direction is set as shown in FIG. 10B. , It can be seen that the image data X ₀ corresponding to the address WADR is moving to the right. If the read start address is RADR2,
As shown in (C) of the figure, it can be seen that the data X ₃ corresponding to the shift memory address 0 moves to the left with respect to VIDEO ENABLE. The effective image section signal in FIG. 10 means the ST counter 912 and the EN counter 913 in FIG.
, F / F 914 and gates 915, 916, 917, 910, 911 are trimming section signals. In the shift memory section 303 of FIG. 10A, an invalid image outside the section of address 0 or WADR is set as a white signal. is necessary.

(7) Interface Signal The timing of the interface signal exchanged between the reader section A and the printer section B will be described with reference to FIGS. 11 and 12.

The horizontal synchronizing signal BD is read by the reader unit A and the printer B.
This is for synchronizing with the rotation of a polygon scanner which scan-drives a polygon mirror arranged in the laser scanning optical system 25 of the printer section B when is connected, and corresponds to the leading edge signal of each scanning line.

VIDEO is an image signal, and each pixel has a pulse width of about 56 ns (nanosecond) per line.
Are output individually. The image signal VIDEO is synchronized with the signal BD when it is connected to the printer unit B, and when transmitting to another unit, the internal analog horizontal sync signal (hereinafter referred to as the signal HSYNC) is used.
Is called). VIDEO ENABLE is a section signal indicating a section in which 4678 pieces of image data are output, and is output in synchronization with the signal BD or the signal HSYNC.

VSYNC is a signal indicating an image section in the sub-scanning direction.

The PRINT REQUEST signal is a signal indicating the paper feed possible state in the printer unit B, and the reader unit A responds to it and outputs the paper feed command by the PRINT signal, and then corresponds to the copy mode set by the operator. The image signal VIDEO is output together with the signal VSYNC after a time T1 considering the magnification, trimming area, and movement amount.

OHP and VTOP are the reader unit A, respectively.
Input signals from sensors 313 and 314 (see FIG. 4) indicating the position of the optical system of FIG. BACK and FORWARD are shown in Figure 4.
From the CPU section 308 to the optical system drive motor driver 311
Is a control signal for the reverse drive and the forward drive given to the.

In FIG. 12, inverted S.DATA, inverted S.CLK,
Inverted CBUSY and inverted SBUSY are signal lines for communication between the reader unit A and the printer unit B. Inversion S.
DATA and S.CLK are both 8-bit serial data and a clock, and both are bidirectional lines. The inverted CBUSY is output when the reader unit A outputs the data and the clock, and the inverted SBUSY is output when the printer unit B outputs the data and the clock.

As an example of a signal communicated serially,
The reader unit A as shown in the timing chart of FIG.
From the printer unit B to the printer section B.

(8) Variable Magnification Function As the variable magnification function of the copying apparatus according to this example, seven types are provided as shown in the following table.

In the table, MX is a magnification in the main scanning direction, MY is a magnification in the sub-scanning direction, DX and DY are document sizes for reading, PX and PY are paper sizes of a recording medium on which image data is formed, and a subscript X is. Main scanning direction, subscript Y
Means the sub-scanning direction. The original size is the size of the entire original or the area specified by the operator.

[0072]

[Table 1]

The zoom function No. 1 and No. 4 are the keys 12 in FIG.
It is repeatedly selected by 7. Magnification changing function No. 2 is key 12
Set by 8 and 129. With the variable magnification function No. 3, key 13
Subscanning magnification MY is set by 1 and 132, and main scanning magnification MX is set by keys 134 and 135. Magnification changing function No. 5 is selected by key 130 to set MY to automatic magnification change and key 13
It can be set by selecting MX for automatic scaling with 3. The variable magnification function No. 6 is set by setting MY to automatic variable magnification with the key 130 and selecting MX with an arbitrary magnification with the keys 134 and 135. On the contrary, for the variable magnification function No. 7, the MX is set to the automatic variable magnification with the key 133 and the keys 131 and 13 are used.
Set by selecting MY to any magnification with and.

FIG. 13 shows an example of the display contents of the display sections 125 and 126 when the seven functions are selected. All numerical values are examples showing percentage display. "A" means "auto" and is displayed to the left of "A".

[0075]

[Outer 1]

"-" Indicates that they are independent in the main scanning direction and the sub-scanning direction, respectively.

A mode of calculating the magnification for automatic scaling will be described. Basically, the main scanning magnification MX is PX / D obtained by dividing the length PX of the paper in the main scanning direction by the length DX of the document in the main scanning direction.
The sub-scanning magnification MY is also given by PY / DY. MX and MY obtained in this way are not always equal. Therefore, variable magnification function No.5
The values for MX and MY in No. 7 to No. 7 can be used as they are, but in the scaling function No. 4, MX
And MY must always be equal, and at this time, one of PX / DX and PY / DY, for example, the smaller one is used as MX and MY. In this example, the copy magnification that can be selected is within the range of 35% to 400%. If the calculation result deviates from this condition, it will be 35% or 40%.
Try to round to 0%.

The functions of the variable magnification functions No. 6 and No. 7 were added to the copying machine according to this embodiment for the first time. That is, in the conventional apparatus, when the automatic scaling is referred to, it means that the magnification is automatically set in both the main scanning direction and the sub-scanning direction, and therefore either one cannot be set to an arbitrary magnification desired by the operator. However, in the present example, it is possible to set either one of them to an arbitrary magnification, so that the application range of the variable magnification function is greatly expanded.

FIG. 14 shows a concrete example of the above seven scaling functions. The left side of the arrow in the figure indicates the original, and the right shaded area is the image after scaling.

The automatic scaling function is shown together with the paper size. The magnification is shown in both the main and sub scanning directions, "A" means auto, and the value in () is the calculated auto magnification.

(9) Paper selection function In this example, an automatic paper selection function is added as another automation function related to the document size. This function selects the optimum paper to obtain the image output of the size that is obtained by multiplying the detected original size or the specified area size by the set magnification, and the original is used as the condition for selecting the paper. It is necessary to be aware of size and magnification. In the past, the automatic scaling function and the automatic paper selection function described above could not be used together, so if the automatic scaling function was already selected when the automatic paper selection function was already selected, or vice versa. In such a case, a warning message is displayed to notify the operator that both functions cannot be used together, or the function selected later will be given priority and the function already set will be operated. Had to force the switch regardless of the person's intention. Therefore, the operator has many restrictions on use, and the mode is arbitrarily switched, so that the operability is low.

Therefore, in the present embodiment, it is possible to use the above-described four automatic variable magnification functions (No. 4 to No. 7) and the automatic paper selection function together.

The basic idea of magnification determination and paper selection when the automatic scaling function and the automatic paper selection function are used together is that the detected original size and the specified area size are set on the paper set in the paper feed stage. Calculating the magnification when auto scaling is performed for each size, the magnification is
Choose a paper that is close to 100%.

According to this, it is rational since the most frequently used normal size copying can be executed without contradiction when using the copying apparatus, and it is confusing by giving the operator operational restrictions and unnecessary messages. Nothing.

When the automatic scaling function and the automatic paper selection function are simultaneously selected, the scaling ratio may be automatically set to 100%.

(10) Copy Sequence FIG. 15 shows a copy processing procedure (copy sequence) according to this example.
An example is shown. This procedure is performed by the CPU unit 308 in FIG.
It is stored in ROM and executed by the CPU.

First, the operator uses the key 116 to select either the upper cassette as the paper feed stage or the mode in which the apparatus automatically selects the paper feed stage (sp501). Then
The operator selects any one of the above-described seven kinds of variable magnification functions using the keys 127 to 129, 130 to 132 and 133 to 135, and designates a desired magnification as necessary (sp502).
The operator selects the entire document or a specific area as the reading area by the procedure as shown in FIGS. 20 (A) to 20 (G), and in the latter case, designates the desired area, and accordingly the area is selected. Areas GXO and GY where coordinates are provided on RAM in CPU 308
Set to O, GX1, and GY1 (sp503). It also sets other functions as needed (sp504).

When the start key 100 is pressed (sp505)
To start the copy operation. If it is determined that the document recognition function is selected (sp506), a preliminary scan (pre-scan) is performed to detect the document position size described above.
Area (sp507), areas DX0 and D provided on the RAM
Set the document position coordinates in Y0, DX1, and DY1 (sp5
08). On the other hand, when it is determined that the document recognition function is not selected (sp506), corresponding values are set on the assumption that the document corresponds to the maximum reading area A3 size (sp509).

When it is determined in sp503 that a specific area is designated (sp510), the origins DX0, DY0 of the recognized original are set to areas GX0, GX1, GY0, GY1.
To the area DX0, DX1, on the RAM
Reset to DY0 and DY1 (sp511). At this point, DX0 and DX are recognized regardless of whether recognition is performed or whether a specific area is specified.
The reading area coordinates are set in 1, DY0, DY1.

Then, DX = DX1-DX0 and DY
= Document size, that is, reading area size D from DY1 to DY0
Calculate X and DY and set in the area on RAM (sp512).

Next, according to the designated mode, the magnification is calculated in the case of automatic scaling, and the paper feed stage is selected in the case of automatic paper selection (sp513). The details will be described later with reference to FIGS.

Next, the printer unit B is instructed to specify the paper feed tray selected in sp513 (sp514). Further, the scanning speed of the optical system in the sub-scanning direction, the write clock to the shift memory unit 303, and the read clock from the shift memory unit 303 are set according to the magnification calculated in sp513 (sp
515). After that, after repeating the image scanning and printing until the copy sequence for the set number of sheets is completed,
End the operation (sp516, sp517).

Details of magnification calculation and paper selection processing (sp513) will be described with reference to FIGS.

First, it is determined whether or not automatic paper selection is selected (sp6
01), if the determination is negative, the paper size already selected by the operator is set in the areas PX and PY provided in the RAM of the CPU unit 308 (sp602), and the reading area already set with PX and PY. From the sizes DX and DY, the magnification is calculated as follows according to the selected scaling function (sp603).

In the case of the variable magnification functions No. 1 to No. 3, the main scanning magnification MX and the sub-scanning magnification MY are already known, and therefore this procedure is terminated without performing any calculation.

In the case of function No. 4, that is, in the case of automatic scaling, MX = MY = max (0.35, min (PX / DX, PY / DY, 4.
0)) is calculated and set in the area on RAM. This is to calculate the magnification for reducing / enlarging the reading area over the entire surface of the paper independently for each main scanning and sub-scanning, and then set the smaller one as the magnification. % Or less (sp60
Four ).

Function No. 5, that is, in the case of vertical and horizontal automatic scaling, unlike in the case of automatic scaling of function No. 4, the main scanning and sub-scanning magnifications may be different.
X = max (0.35, min (PX / DX, 4.0), MY = max (O.35, min (PY / D
Y, 4.0)) and obtain these (sp605).

In function No. 6, since MX is known, M
Similarly, since only MY is known in Function No. 7 in the case of function No. 7, only MX can be obtained by the same calculation as in vertical and horizontal auto scaling (sp606, sp607).

When it is determined in sp601 that automatic paper selection is selected, the paper size of the upper cassette is first set to the area P on the RAM.
XU and PYU, and the paper size of the lower cassette is PX
Set to L and PYL (sp608).

Next, the scaling function number is tested (sp609),
The processing shifts to the processing shown in FIG. 17 or 18 according to the function. In FIG. 17, i is a control variable for selecting a paper cassette.

In the case of the function Nos. 1, 2, and 3, since both MX and MY are known, the sizes obtained by multiplying the reading area sizes DX and DY by the magnifications MX and MY, respectively,
It is determined whether or not it is smaller than the paper in the upper cassette in both the main and sub scanning directions (sp611), and similarly for the lower cassette (sp613). As a result, when it is determined that neither the paper in the upper cassette nor the paper in the lower cassette can be inserted (sp625)
Notifies the operator that there is no optimum paper, returns to H in FIG. 15, and ends the procedure without performing the copying operation (sp639).

When an image is placed on only one of the sheets in the upper cassette or the lower cassette (sp625), that paper feed tray is selected and the paper size is set in the areas DX and D on the RAM.
Set to Y (sp637, sp638).

When an image is included in both the upper cassette paper and the lower cassette paper (when i = 3), the size of the upper cassette paper and that of the lower cassette paper are compared, and main scanning and sub-scanning are performed. When one is smaller than the other, the smaller paper is selected, and when exactly the same, the upper stage is selected in this example (sp626 to sp635). Also, when the size relationship between the main scan and the sub scan differs, the one with the smaller area is selected.
(sp636).

In SP609, the scaling function is No. 6 or N.
When it is determined to be o.7, one of MX and MY is known, so the upper and lower sheet sizes are compared with the image size only in the direction in which the magnification is unknown (sp616, sp618, s).
p621, sp623), specify the paper (sp625 or less). The procedure is the same as that of the functions No. 1 to No. 3. However, since MY is unknown in function No. 6 and MX is unknown in function No. 7,
After the paper size is determined (sp637, sp638), the magnification is calculated based on the paper size and the read size (sp641,642).

If the scaling function is determined to be No. 4 or No. 5 in sp609, first the scaling ratio for scaling the reading area to the entire surface of the paper is calculated for both the upper and lower rows (Fig. 18 sp643, sp644, sp651, sp652). As a result, the magnifications MXU and MYU for the entire upper sheet and the magnifications MXL and MYL for the entire lower sheet are CP.
Set it in the area provided in the RAM of U section 308.

Then, these MXU, MYU, MXL,
An appropriate paper size is determined from MYL based on an appropriate standard. In this example, the standard is α = (MX-1.0
) ² + (MY-1.0) ² , that is, the smaller of the sum of squares of the error with respect to the unity length is selected (sp645, sp646), and when this is equal, β = (MXMY-1.0) ² , That is, the smaller one of the squares of the error from the equal size in the area is selected (sp
647, sp648).

As a result, the selected paper size PX, PY
And the corresponding magnifications MX and MY are set in the RAM area (sp649, sp650), and the magnification calculation and paper selection processing are completed.

Further, in connection with this magnification calculation and paper selection processing, as shown in FIG. 19, when both the automatic scaling and automatic paper selection functions are selected at the same time, the scaling with automatic scaling specified. Is also rational (sp653 to sp658).

(11) Operation for designating reading area FIGS. 20 (A) to 20 (G) show the liquid crystal display 123 and the soft key 12
An operation procedure for designating a specific area as a reading area using 4 (see FIG. 3) is shown.

When the power is turned on, the entire original is automatically selected as the reading area as shown in (A) in the figure. If the SK6 soft key corresponding to "ETC" is pressed here, another function such as a move function can be selected. SK
In the figure, press one of the soft keys 1, SK2, SK3
The display is as shown in (B), and the operator is requested to specify the reading area.

When left in this state for a predetermined time, it is shown in the figure (C).
Is displayed, and the reading area prompts the user to select either the entire original or a specific area. Where the operator is SK1 or SK
Pressing the 2 soft key returns to the display as shown in (A) in the figure, while pressing the SK4 or SK5 soft key in the figure
(D) is displayed.

In the display such as (D) in the figure, in the main scanning direction
(x) and sub-scanning direction (y)
It is possible to input a specific area in mm using. In this state, the 3 corresponding to softkey SK1 at first
The cursor of the book is blinking. Here, when the operator inputs "1", "0", "0" in order from the numeric keypad, and then presses the "*" key, the display shown in (E) in the figure. Changes to, the entered “100” is set, and then the cursor corresponding to the SK2 soft key blinks.

Similarly, when the area is input, for example, in the figure
The display becomes as shown in (F), and "OK" is displayed when all four coordinates have been entered. When the SK5 soft key is pressed, the setting of the specific reading area is completed, and the display shown in (G) in the figure is displayed, and the designated area is displayed. In this state, if any one of the SK1, SK2, SK3, SK4, and SK5 soft keys is pressed, the display as shown in FIG.

In this input example, GX0 = 100, GX1 = 200, GY in sp503 in the copy sequence of FIG.
O = 50 and GY1 = 300.

The reading area will be described with reference to FIGS. 21 (A) to 21 (C).

FIG. 21 (A) shows the state of the original document M placed on the original table glass 3. As a result of recognition by the prescan, its position is the coordinates of the point closest to the original document reference point and the point farthest from it. Are P0 (DX0, DY0) and P1 (D
X1, DY1). Here, when the entire document is set to be read by the setting of FIG. 20, DX0, DX1, DY0, and DY1 of FIG. 21A are set as the reading area.

On the other hand, according to the procedure shown in FIG.
When 0, GX1, GY0, and GY1 are set, the area coordinates are for the original as shown in FIG. 21B, so that the reading area on the original table glass 3 to be finally set is As shown in FIG. 21C, the origin coordinates of the document recognized in a specific area are offset.

According to the above embodiment, when the automatic scaling function and the automatic paper selection function are selected at the same time, both the magnification and the paper are properly selected, so that a copying apparatus with high operability can be provided.

Further, it is possible to provide a function of automatically changing the magnification in one of the main scanning direction and the sub-scanning direction at the operator's desired magnification and in the other.

[0120]

The setting means for manually setting the scaling factor in either the vertical direction or the horizontal direction performs the setting. Depending on the scaling factor set by this setting means and the size of the input image, Select the sheet size to be played back, and select the remaining one of the scaling factors in the vertical and horizontal directions that is not set by the setting means according to the selected sheet size and the size of the input image. Since the image is magnified by the calculation and the scaling ratio set by the setting means and the calculated scaling ratio, the operator can set the scaling ratio in one of the vertical and horizontal directions to obtain an appropriate sheet size. Can be automatically selected, and the scaling factor in the remaining one direction can be automatically calculated, and one of the vertical and horizontal directions is the scaling factor desired by the operator and the remaining Direction it is possible to reproduce to fit the size of the sheet to be reproduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a sectional view of the same embodiment.

FIG. 3 is a plan view showing a configuration example of an operation unit of the embodiment.

FIG. 4 is a block diagram showing a configuration example of a reader unit A in FIG.

5 is a circuit diagram showing a detailed configuration example of a document position detection unit in FIG.

6 is a circuit diagram showing a detailed configuration example of a shift memory unit in FIG.

FIG. 7 is a diagram showing a timing chart for explaining the operation timing of each part of FIG. 6;

FIG. 8A to FIG. 8D are waveform charts for explaining variable magnification in the sub-scanning direction.

FIG. 9 is an explanatory diagram for explaining a mode of image movement.

FIG. 10 is an explanatory diagram of a mode of image movement, similarly.

FIG. 11 is a waveform diagram for explaining a signal transmission / reception timing between the reader unit A and the printer unit B.

FIG. 12 is a waveform diagram of signal transmission / reception timings.

FIG. 13 is an explanatory diagram showing an example of correspondence between a scaling function and display contents according to the present example.

FIG. 14 is an explanatory diagram showing a specific example of a scaling function according to the present example.

FIG. 15 is a flowchart showing an example of a copy processing procedure according to the present example.

16 is a flowchart showing a part of an example of a detailed procedure of magnification calculation / paper selection processing in the processing procedure of FIG.

FIG. 17 is a flowchart showing another part of the same.

FIG. 18 is a flowchart showing another part of the same.

FIG. 19 is a flowchart showing still another portion of the same.

FIG. 20 is an explanatory diagram illustrating a setting operation of a reading area of a document image.

FIG. 21 is an explanatory diagram illustrating a reading area on a document image.

[Explanation of symbols]

 A Reader section A-1 Operation section B Printer section M Originals 1 CCD 2 Fluorescent lamp 3 Original platen glass 5,7 Mirror 6 Lens 15 Paper cassette 25 Laser scanning optical system unit 100 Copy start key 102 Copy stop key 103 Setting key 104,108,109,122 Keys 105,111,112,114,118 Display 116 Paper selection key 117 Paper feed stage display 118 Paper size display 123 Liquid crystal display 124 Soft key 125 Sub-scanning direction magnification display 126 Main scanning direction magnification display 127-129,130-132, 133-135 Change Double function key 301 CCD reading unit 303 Shift memory unit 304 Magnification / movement processing unit 306 Trimming processing unit 307 Document position detection unit 308 CPU unit 311 Motor driver 313,314 Sensor

Claims (1)

[Claims] 1. An image scaling apparatus capable of scaling and reproducing an image with a scaling factor in which a vertical scaling factor and a horizontal scaling factor are independent of each other, and one of the vertical scaling factor and the horizontal scaling factor is manually Setting means for setting, a scaling ratio set by the setting means, and a selecting means for selecting a sheet size to be reproduced according to the size of the input image, and a sheet size selected by the selecting means, According to the size of the input image, one of the scaling factors in the vertical direction and the horizontal direction, which is not set by the setting unit, is operated, and a scaling unit set by the setting unit is operated. An image scaling apparatus comprising: a scaling unit that scales an image with a scaling factor and a scaling factor calculated by the computing unit.