JP2948603B2 - Image encryption recording and playback device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[Industrial Application Field] The present invention relates to a recording apparatus for performing encryption recording / reproduction recording of an image.
In particular, scan original images that are readable or recognizable by humans.
Scanning by pixel division in the scanner, encryption different from the pixel reading order
The image signal is recorded in the order of conversion and cannot be read or recognized by humans
When recording an encrypted image on a recording medium and playing back the original image
Scans the encrypted image with a scanner using pixel division
The image signal is recorded in the decoding order to reproduce the image and the original image
The present invention relates to an encrypted recording / reproducing apparatus for obtaining a reproduced image of the above. [Prior Art] The above-mentioned encrypted recording / reproducing apparatus is disclosed in, for example,
No. 5948. This type of encrypted playback device allows humans to read or recognize
Stores image signals obtained by scanning the entire surface of the original image (original document)
Has two possible page memories for those pages
To exchange two-dimensional image signals between memories
Thus, the encrypted image is created and reproduced. Or,
Line memo that stores the image signal of the original document in units of several lines
Input order and line-by-line input to the line memory.
Different output order from line unit from in-memory
Thus, creation and reproduction of the encrypted image are performed. [Problem to be Solved by the Invention] However, two pages of Japanese Patent Publication No. 63-5948
According to the encryption / decryption using the page memory of
Because encryption is performed without considering the size of the
Make sure to use recording paper that matches the size of the page memory.
Information will be lost in the manuscript
There's a problem. Necessary image information is encrypted during decryption recording.
Are scattered on the original document
The size of the recording paper to be printed is difficult to understand,
There is a problem that only a small part of the surface is recorded. In addition, the method using line memory for several lines
To encrypt without considering the size of the manuscript, for example, manuscript
If you select a recording paper of the same size as
The meaning of the original is also changed by changing the line input / output order.
The problem that the image with the mark protrudes from the recording paper
is there. The present invention prevents disturbances in encrypted and decrypted records
To prevent recording leaks and record only a small part of the paper.
The purpose is to prevent the occurrence of recordings. [Means for Solving the Problems] A mode designating method for designating an encryption mode and a decryption mode
Step (106), scanning the original in the main scanning direction and sub-scanning direction
Image reading that sequentially outputs image signals for each read pixel
Taking means (101) and an image outputted by the image reading means (101)
In an encryption order different from the order in which the signals were received and received
Encryption processing means (124) for outputting an image signal;
Receiving the image signal output by the capture means (101) in the encryption order
Image signals in the decoding order to reproduce the original image.
Decoding processing means (124) for outputting a signal,
When the stage (106) specifies the encryption mode, the encryption process
Decoding the image representing the image signal output by the means (124);
When the decryption mode is specified, the decryption processing means (124)
Record the image represented by the output image signal on a recording medium
Image recording means (103);
In the raw device, the mode specifying means (106) specifies the encryption mode.
Set the encryption order corresponding to the size of the recording medium,
When the decryption mode is specified, the size of the original to be
Order setting means for setting the decoding order corresponding to the size (10
4). The symbols in parentheses are shown in the drawings.
The corresponding elements of the embodiment described later are shown. [Operation] If the encryption mode is designated by the input means (106),
If the order setting means (104)
The image recording means (101) to encrypt and record the image signal.
Set the encryption order according to the size of the recording medium.
Introduction, most preferably the optimal encryption order for the size of the recording medium
The encrypted image in which the recording position of the image signal has been replaced
Is obtained. As a result, the image information of the original document is lost.
The best pixel position for the size of the recording medium without
Replacement can be performed. Further, the decoding mode is set by the mode designating means (106).
If selected, the order setting means (104)
The size of the original (the above recording medium on which the encrypted image was recorded)
Since the decoding order is set according to the
Therefore, the replaced image can be reproduced. That is, according to the present invention, an image that can be read or viewed by a human
When recording (original document) encrypted, the size of the recording medium
Since the encryption order is set according to the
Pixels that do not leak out and that are compatible with the size of the recording medium
An encrypted image can be recorded by switching the positions.
When restoring (playing) an encrypted image to the original document image
Is the original, that is, the recording medium on which the encrypted image is recorded.
Since the order of decryption is set according to the size,
The recording medium on which the image is to be recorded (the original
The order of encryption and decryption according to the size of
Since they are both set uniquely, they are always consistent and
No disruption occurs between encoding and decoding. Moreover, the encrypted image
The optimal encryption order and size for the size of the
Recording order and decoding order in advance to avoid recording omissions and small
It is possible to prevent the recording of only the information in advance. Other objects and features of the present invention will be described below with reference to the drawings.
Will be apparent from the description of the embodiment. [Embodiment] Digital copying incorporating one embodiment of the present invention in FIG.
FIG. 2 shows an outline of the structure of the mechanical part of the copying machine, and FIG. 2 shows the copying machine shown in FIG.
1 shows an outline of the configuration of the electrical unit. Referring first to FIG. 1, the mechanism of a digital copying machine will be described.
Is the scanner unit 101 that mainly reads the image of the original
To the printer unit 103 that records images on recording paper.
Be killed. Original 1 is placed on platen (contact glass) 2
It is illuminated by the fluorescent lamp 3. The reflected light of Document 1 is
CCD array, which is a line image sensor
Incident on. Fluorescent light 3, lens array 4 and CCD5
Document 1 is mounted on a carriage not shown
When driving, drive from right to left by carriage drive motor 23
Then, the entire surface of the original 1 placed on the platen 2 is scanned. Referring now to FIG. 2, the reflected light of document 1 is reflected on CCD5.
It is converted to a more electrical signal, and the scanner unit 101 and
The necessary processing is performed by the image processing unit 102, and the printer
LD (laser diode) drive circuit 130 for unit 103
Is input to The LD drive circuit 130 activates the LD 131 and changes from the LD 131.
The adjusted laser light is emitted. FIG. 1 is referred to again. Laser emitted from LD131
The light is reflected by the polygon mirror 6, the fθ lens 7, the mirror
After the image formation, the photosensitive drum 9 is irradiated with an image. The polygon mirror 6 is fixed to the rotation axis of the polygon motor 10.
The polygon mirror 10 rotates at a constant speed and
The rigon mirror 6 is driven to rotate. Turn of polygon mirror 6
The rotation causes the laser beam to rotate in the direction of rotation of the photosensitive drum 9 (clockwise).
Direction), that is, scanning in the direction along the drum axis
Is done. The surface of the photoreceptor drum 9 generates a high voltage of negative voltage (not shown).
Uniform charging by charging charger 11 connected to the raw device
Let me do. The modulated laser beam irradiates the photoconductor surface.
Charge, the photoconductive surface charges the photoconductor surface,
Disappears after flowing to the equipment ground. Here, the document density is
Do not turn on the laser in the part,
The part turns on the laser. As a result, the photosensitive drum 9
An electrostatic latent image corresponding to the density of the document 1 is formed on the front surface. This
When the electrostatic latent image is developed by the developing unit 12,
A toner image is formed on the surface of the drum 9. On the other hand, the recording paper 17 stored in the cassette 16
The sheet is fed by the sheet feeding operation of
At a predetermined timing.
While the recording paper 17 passes below the photosensitive drum 9, the transfer
The toner image is transferred to the recording paper 17 by the action of the charger 13.
The recording paper 17 is exposed to the photosensitive drum by the action of the separation charger 14.
It is peeled off from the ram 9. The peeled recording paper 17 is sent to the fixing unit 21 where it is removed.
Is transferred onto the recording paper 17 and the toner
The recording paper 17 to which is adhered is discharged to the tray 22. Also, the toner remaining on the photoreceptor surface after transfer is cleared.
Removed by the cleaning unit 15. FIG. 2 is referred to again. The electrical components of a digital copying machine
A scan that mainly reads the original 1 and outputs an image data signal
Scanner unit 101, an image processing unit for processing image data signals.
Knit 102, a printer that performs recording based on image data signals
Unit 103 generates a synchronization signal and
And the timing of signal transfer between each element in the unit.
Synchronization control unit 105, input and display of various processing modes
Display unit 106 for performing
And a system control unit 104 for controlling
ing. In scanner unit 101, output from CCD5
The signal is an 8-bit digital signal by the A / D conversion circuit 110
And input to the shading correction circuit 111.
You. The shading correction circuit 111 controls the illuminance of the fluorescent lamp 3.
Of the light receiving element inside the CCD5 and dark current
This is a circuit for performing correction and the like. Also, the scanner unit 101 has a carriage driving mode.
Motor 23 and a motor control circuit 112 for controlling the rotation of the motor.
Having. The image data output from the shading correction circuit 111
Signal is input to the MTF correction circuit 120 of the image processing unit 102.
Is forced. The MTF correction circuit 120 fills the input image data signal
Circuit to increase image sharpness and remove noise.
Leave. The image data signal output from the MTF correction circuit 120 is
The signal is input to the double processing circuit 121. The scaling processing circuit 121 runs the input image data signal
Inspection direction (the direction of arrangement of CCD5 which is a line image sensor)
Is enlarged / reduced. In the sub-scanning direction (line image
Magnification / reduction of the CCD sensor, which is the image sensor, and the vertical direction)
Small is the rotation speed of the carriage drive motor 23 shown in FIG.
This is done by controlling the degree. The image data signal output from the scaling processing circuit 121 is
Input to binarization processing circuit 122 and original size detection circuit 123
Is done. The binarization processing circuit 122 is output from the scaling processing circuit 121.
Dithering the 8-bit multi-valued image data signal
And a circuit for outputting a binary image data signal. Ma
The original size detection circuit 123 is placed on the platen 2.
Detecting the density difference between the original 1 and the original pressure plate 24,
This is a circuit for detecting the magnitude. Image data signal output from the binarization processing circuit 122
Is input to the encryption / decryption processing circuit 124. The encryption / decryption processing circuit 124 operates in the encryption mode or
The processing mode of the decoding mode is selected on the operation display unit 106.
When selected, the input image data signal is processed (image
(A change in the input / output order of image data). The image data output from the encryption / decryption processing circuit 124
Data signal is sent to the LD drive circuit 130 of the printer unit 103.
Is entered. The LD drive circuit 130 outputs laser light depending on temperature and the like.
While compensating for fluctuations, the LD131 is activated according to the image data signal.
The laser beam is energized and emitted to the LD 131. The system control unit 104 includes a CPU 140, a ROM 141,
Microcomputer with AM142 and I / O port 143
And controls the entire copying machine. FIG. 3 shows the appearance of the operation display unit 106 shown in FIG.
You. Referring to FIG. 3, this operation display section 106
ー Start key 160, numeric keypad 161, clear stop key
162, interrupt key 163, set number display 164, number of copies
Equipped with display 165 and touch panel display 166
ing. The touch panel display 166 is located on the display surface of the display.
Panel with many transparent contact detection switches
The display unit and the operation unit are integrated. One
In other words, the selection of various operation modes and the input
The dance display is displayed on the touch panel display 166.
Done. 4a, 4b and 4c show the copying machine shown in FIG.
1 shows an example of the encryption / decryption processing. Figure 4a
Is the original document, and Fig. 4b is an encrypted copy of the original document
Fig. 4c is a decrypted copy of the encrypted image
It is a reproduced image. As shown in Fig.4a, the original document is an effective image in the main scanning direction.
Area and the invalid image area.
The area can be further divided into an encrypted area and an area that is not.
Each area can be processed differently. Toes
The encrypted area of the effective image area is
Divided into a plurality of blocks (blocks 1-4), Fig. 4b
As shown in the encrypted image of FIG.
4) The output order is changed, so that the contents of the original
It is encrypted so that it cannot be recognized. Also, effective image
Copy the non-encrypted area of the area as it is
Is done. On the other hand, in the invalid image area, the image is erased and tracking error occurs.
It becomes a rear, and a tracking mark is further added. In the reproduced image shown in Fig. 4c, the block
(1-4) is restored to the original order, and the tracking area
The tracking mark that had been added to the
The image of the original shown in the figure is reproduced. Tracking machine
Mark is a mark indicating the boundary of blocks (1 to 4)
This mark is added during decoding, and this mark is detected during decoding.
Based on this, the boundaries of blocks (1 to 4) are determined, and
The order of force is changed. FIG. 5 shows an encryption / decryption processing circuit 124 shown in FIG.
Is shown. Referring to FIG. 5, external (binary processing)
The image data signal from the circuit 122) is supplied to the line buffer circuit 1
25 and the mark detection circuit 126. The mark detection circuit 126 outputs the decrypted copy (FIG. 4b → 4c
(Fig.) A circuit that detects tracking marks when
The position where the block is detected is output to the address management circuit 127.
You. The line buffer circuit 125 is composed of a memory or the like.
External image data signal for one line or several lines.
And stores the stored image data signal with a mark.
It is a circuit that outputs to the addition circuit 128. The address management circuit 127 is a
The memory write address and read address are output.
4a, 4b and 4c.
When an encrypted copy (Fig. 4a → Fig. 4b)
Blocks (1 to 4) at the time of P (Fig. 4b → Fig. 4c)
Replacement control, tracking area, tracking
It also controls the addition / deletion of a mark. Block (1-4)
Exchange (execution of encryption order and decryption order)
The generation order of the write address and the read address
It is realized by turning. In addition, the write address (or read
The output address is based on the output of the mark detection circuit 126.
Is output as The mark adding circuit 128 is used for tracking during encrypted copying.
Area and tracking mark added, decrypted copy
The circuit which erases the tracking mark at the time
The processed image data signal is output. Also this
The operation timing of these processes is output from the address management circuit 127.
It is based on force. FIG. 6 shows the mark detection circuit 126 and the line bar shown in FIG.
Buffer circuit 125, address management circuit 127 and mark addition
4 shows a configuration of a circuit 128. Referring to FIG.
Data signal from the serial input / parallel
Input to the shift register 200 with the output of NAN.
This is provided to the D gate 203. Therefore, the NAND gate 203
When the H-level image data signal continues for m pixels, L
Output level signal. The output of the last stage of the shift register 200 is
Shift of serial input / parallel output via data 202
The output of the shift register 201 is also given to the register 201.
Provided to NAND gate 204. Therefore, the NAND gate 204
Means that the L-level image data signal continues for n pixels
To output an L-level signal. Further, the outputs of NAND gates 203 and 204 are NOR gate 205
Is input to the NOR gate 205 as a mark detection signal.
ing. Therefore, the mark detection signal becomes H level.
Indicates that the L-level image data signal is continuous for n pixels or more,
And when the H-level image data signal continues for m images
Become. The input of such a series of image data signals is
Tracking mark star of the encrypted image shown in Fig. 4b
In this case, the mark detection circuit 126
Detect the racking mark start position. Also, the image clock input to the mark detection circuit 126
The signal is a synchronizing signal of the image data signal and the shift register
It is used as a clock signal for the data 200 and 201. On the other hand, the image data signal is
Input to buffers 210 and 211 of 3-STATE output
The outputs of buffers 210 and 211 are stored in RAMs 212 and 213, respectively.
Connected to the input terminal of the selector 216 as the data terminal of
I have. RAMs 212 and 213 store image data for one line, respectively.
Data from the address management circuit 127.
Write address signal and read address input
The signals are sent to the respective RAMs 212 and 21 via the selectors 214 and 215.
Entered in 3. Each element of the line buffer circuit 125 is a toggle for each line.
This operation is performed by the toggle control circuit 217.
Made more. That is, the image data signal is written to the RAM 212.
When reading the image data signal from the RAM 213,
By the toggle control circuit 217, the buffer 210 operates and RA
An image data signal is input to M212. At this time, buffer 21
The output of 1 is in the Hi impedance state. SEREC
214 selects the write address signal and outputs it to RAM 212
Then, the selector 215 selects the read address signal and
Output to 213. RAM212 is set to write mode
And the image data signal output from the buffer 210 is selected.
Is written to the address output from the data 214. RAM213 is read
Output mode is selected and the selector 215
Is input to the selector 216.
You. The selector 216 selects an image data signal output from the RAM 213.
Select and output. Write the image data signal to RAM 213,
When reading an image data signal from the RAM 212, the reverse is true.
Become. The toggle operation is performed by using a line synchronization signal to the toggle control circuit 217.
Is switched every time is input. Also, RAM 212 and 21
The pixel clock signal input to 3 is RAM 212 and 213
Used as a write clock for The address management circuit 127 is controlled by a line synchronization signal.
Clear the count value and count the pixel clock signal.
Counters 220 and 221.
The output of the counter 221 is the LUT
(Look-up table) After being converted by the circuit 222,
Read address signal to line buffer circuit 125
Is output. The LUT setting signal input to the LUT circuit 222 is
The LUT contents are output from the
Used in exchange. FIG. 7 shows the configuration of the LUT circuit 222. See FIG. 7
And the LUT circuit 222 includes the selector 250, the RAM 251 and the 3-STATE
It is composed of output buffer 252 and copying is in progress
Indicates that the signal of the upper bit of the counter 221 passes through the selector 250
Input to RAM 251 and output data and counter of RAM 251
The lower bit signal of 221 is sent to the line buffer circuit 125, while the system control unit 104 rewrites the contents of the LUT.
The selector 250, the mode select signal causes the selector 250 to
Selects the dress signal and the buffer 252 transfers the data signal to the RAM 251
And the RAM 251 is set in a writable state. This
System control unit 104 in the state of WR (write instruction)
When the signal is output, the address specified by the address signal is output.
Data specified by the data signal in RAM2
Written to 51, the contents of the LUT are changed. Referring again to FIG.
Counter 221 outputs to comparators 223, 224 and 225.
Is also entered. Other inputs of comparators 223, 224 and 225
Each terminal has a tracking mark start position
Mark start signal indicating tracking mark
Mark end signal indicating tracking position and tracking area
Area end signal indicating the end position of
And the outputs of comparators 223 and 224 are connected to AND gate 2
26 and the output of comparator 225 to AND gate 227.
Is forced. AND gate 226 is used for encrypted copy (encrypted mode)
Only the H-level encryption designation signal is input.
And, the output of the AND gate 226 is the counter 22 at the time of encrypted copy.
1 output is above the mark start signal and mark end
It goes to H level when the signal is lower than the signal. AND gate 227, when encrypted copy (encryption mode)
And H level during decryption copy (decryption mode)
Since the encoding / decoding signal is also input, the AND gate 227
Is output during encrypted copy or decrypted copy.
H level only when the output of the
It becomes. The output of the comparator 224 is also input to the NAND gate 228.
It is empowered. The mark detection circuit 126 detects the output mark of the NAND gate 228.
Decoding that becomes H level only during output signal and decoding copy
Since the designated signal is input, the output of the NAND gate 228 becomes L
The level becomes the counter 221 at the time of decryption copy.
If the output is below the mark end signal and the mark detection circuit 12
6 detects a mark (mark detection signal = H level)
Le) only. On the other hand, the LD terminal of the counter 220 is connected to the output of the NAND gate 228.
However, the data input terminal of the counter 220
Write signal during decryption copy
The address signal is assigned to the original document (encrypted image).
It is automatically corrected by the racking mark. F / F (flip-flop) 229 is the output of counter 221
To the output of the NAND gate 228 and the OR output of the pixel clock signal
Latched and output as a mark position signal. Also,
The line synchronization signal is connected to the clear terminal of F / F229.
The F / F229 data is cleared at the beginning of each line. In addition, the above-mentioned encryption designation signal, encryption / decryption
Signal, mark start signal, mark end signal and
Rear end signal is output from system control unit 104
The mark position signal is output to the system control unit 104.
Is forced. The mark adding circuit 128 includes a selector 240,
When the output of the AND gate 227 is at L level, the selector 240
Selector 216, and the output of the AND gate 227 becomes H level.
In the case of a bell, select the output of the AND gate 226 and
Output as a data signal. Therefore, when encrypted copy (encryption mode), track
Decoding area and tracking mark added
Erase area is added during encrypted copy (decryption mode).
You. Also, during normal copying (encryption / decryption signal = L)
The image data signal output from the selector 216 is always selected.
Selected. FIG. 8 shows the system control unit 104 shown in FIG.
9a, 9b and 9c show the processing operation.
Touch panel display 1 on operation display unit 106 shown in the figure
66 shows an example of the display screen. When the power of the digital copier (Figs.
The stem control unit 104 sets the processing mode etc. to the initial state.
Settings and display the standard input screen as shown in Figure 9a.
Is displayed on the screen 166 and waits for a key input (see FIG. 8).
Subroutine 1 &2; Subroutines in parentheses below
Omit the word "step" and write only those numbers.
). If any key is operated in this state,
A process corresponding to the input key is executed (2). For example, the touch panel display 166 “Encryption
When the `` Peak '' display portion is pressed, the
Display the code code input screen and wait for the input of 4-digit encryption code
State (3,4). Enter the encryption code using the numeric keypad.
4 digits are input, and then the "End" display section is pressed
Completed when done. System control unit 104 completes input of encryption code
This will set the encryption mode, and thus this series of operations
If the decryption mode was set before the operation, decrypt
Cancel the mode, set the encryption mode, and then
Of the address conversion table according to the input encryption code
Create and display the standard input screen as shown in Figure 9c.
(3,4). Shading of the “encrypted copy” display part in FIG. 9c
Indicates that the encrypted copy has been selected. Ma
In addition, in the display state of FIG.
When pressed, the encryption mode is canceled and the
The standard input screen as shown is displayed again (3, 4). In the display state of Fig. 9a, the "decryption copy"
If pressed, the decryption mode is set and the
Same as when the “encrypted copy” display portion is pressed.
Process such as inputting a password and creating an address translation table.
(3,4). FIG. 10 shows an example of a method for creating an address conversion table.
11a, 11b, 11c and 11d.
An example of the address conversion table obtained by the method shown in FIG.
Is shown. In the system control unit 104, as shown in FIG.
Two code tables are prepared in a predetermined area in the ROM 141 in advance.
Have been. As exemplified in FIG. 10, the system control unit
In the code table 104, the input encryption code is
Transform to get two numbers X (= 3) and Y (= 5).
Next, the operation shown in the equation (1) is performed to obtain the address conversion data.
The values of all elements of the bull T (i) are calculated. T (i) = (X + Y × i) mod Z (i: 0 to Z-1) (1) In the equation (1), Z is all elements of the address conversion table.
Is a number, and the code table for Y has a prime relation with Z
The number is pre-selected. For example, in a circuit having a total number of elements Z = 16, X = 3, X =
5 is created, the address translation table shown in FIG.
Such an address conversion table is obtained. Further, in the above, it is fixed in the system control unit 104.
In this example, the code table is stored in the ROM 141.
Provide a code table with removable memory elements such as
Is also good. Referring again to the flowchart shown in FIG.
9a In the display state (2-4), the operated key
In the case of a peak start, the system control unit 104
Check whether the digital copier is ready for copying.
Click to display the corresponding message if copying is not possible.
And redisplay the standard input screen as shown in Figure 9a etc.
(5,7,15,2). Also, input the number of copies, etc.
When a key is operated, the mode setting according to the key operation
The standard screen is displayed again (5,6,
2). Digital copy of operated key with copy start key
Perform pre-scan when machine is ready to copy
Check if it is necessary (5,7,8). press
The scan is mainly performed by the scanner unit 101 and the image processing unit.
In the operation mode in which the recording paper is not discharged.
The system control unit 104 performs a pre-scan
If it is determined that it is necessary, other units are controlled to
Rescan to detect a known document size or scan a document.
The queue amount is detected as needed (8, 9). The original skew amount is detected when the decryption mode is selected.
Only when the system control unit 104
It works like First, as shown in the block diagram of FIG.
The decoding designation signal, mark end signal, etc.
Set and instruct the scanner unit 101 to start scanning the original
I do. When the scanner unit 101 starts scanning a document,
The system control unit 104 counts the line synchronization signal
Starts, and each time the count value reaches a predetermined value,
Reads and writes the mark position signal output by the
Remember When scanning of the original is completed, the system control unit
Scans the document by processing the mark position signal
Evaluate the amount of access. For example, the mark that memorizes the document placement state on the platen
If the relationship with the position is as shown in Fig. 12, the system
The control unit 104 controls the first and last sections of the mark position.
Length L ₁ −L _Two Is determined by the document size detection circuit 123.
Length L in the sub-scanning direction of the detected document size _Four (I want
Is the length in the sub-scanning direction of the document size input from the operation unit
Sa) and L ₁ −L _Two Are substantially matched. L _Four And L ₁ −L _Two If almost matches, the data at the mark position
Of the tracking mark from the data. Next, Hara
Of the document size detected by the document size detection circuit 123
Length L in scanning direction _Three (Or the original input from the operation unit
Length in the main scanning direction).
Rating Δ _TH And the standard value Δ _TH More inclined
Is smaller, the original skew amount is appropriate and
It is determined that encryption is possible. If the skew amount of the original is too large,
Mark start position is outside the mark end set position
And the count value of the counter 220 shown in FIG.
Since motion compensation is no longer performed,
Length L in scanning direction _Four And mark position signal length L ₁ −L _Two And the ratio
To make sure that the counter value is no longer automatically corrected.
I'm preventing it. When the length of the original in the main scanning direction is increased, the inclination Δ
Are the same, the amount of displacement occurring in the sub-scanning direction increases,
The rate at which low-quality reproduced images are discharged increases. others
In this embodiment, in the main scanning direction as illustrated in FIG.
Standard value Δ according to length _TH In the sub-scanning direction
To maintain a constant image quality.
You. Referring to FIG. 8 again, the document
Size cannot be detected, or the skew
In some cases, the system control unit 104 responds
Display a message and return to the standard screen (10,15,
2). That is, the substantial recording operation of the copying machine does not start.
Then, a state in which a key input is performed is established. On the other hand, pre-scan is not necessary or
If the scan results are good, enter encryption mode.
Checks if or decryption mode is selected
(11). Neither encryption mode nor decryption mode was selected
If the system control unit 104
LUT setting of a standard address conversion table that does not perform
The signal is written to the RAM 251 shown in FIG.
Encryption designation signal, encryption / decryption signal, decryption shown in the figure
Set the conversion designation signal, etc. (13). Next, the system control unit 104 determines the set conditions.
Control the copy operation in the case (14), and when this is completed
The message is displayed as needed (15), and the standard screen is displayed.
Is displayed again (2). If encryption mode or decryption mode is selected
In this case, sort the address conversion table (11,1
2). The sorting of the address translation table is
Depending on the length of the recording paper in the main scanning direction,
Determines the image range based on the length of the original in the main scanning direction.
So that the image sorting is completed within the image range of
Address conversion table T obtained by equation (1)
(I) is a process for reworking the
Image information can be recorded on recording paper. For example, depending on the length of the recording paper in the encryption mode
If the determined image range is as shown in FIG.
If the address conversion table shown in FIG.
First, the element part where the tracking area is added

The element part [10] including [0] and the rear end of the image range is extracted, and T ′ (i) = i (i = 0,10) so that these element parts are not replaced. Next, among the remaining elements, elements within the image range, 1 ≦ T (i) ≦ 9, are sequentially extracted, and these are sequentially assigned to T ′ (i) (1 ≦ i ≦ 9), and out of the image range. 11 ≦ T (i) ≦ 15 are also extracted in turn, and these are sequentially assigned to T ′ (i) (11 ≦ i ≦ 15), and an address conversion table as shown in FIG. T ′ (i) is obtained. In the case of the decryption mode, rearrangement is performed in the same manner as in the encryption mode according to the image range determined by the length of the document (encrypted image), and as shown in FIG. 11 (c). An address conversion table T '(i) is obtained, and then an address conversion table T "(i) for performing reverse conversion of the address conversion table T' (i) is obtained by the following equation: T" (T '(i)) = I (i: 0 to Z-1) (2) For example, the inverse transform of (c) in FIG.
Is realized by the address conversion table as shown in FIG. As described above, when the encryption mode is selected, the address conversion table is sorted according to the size of the recording paper (FIG. 4b) on which the recording is performed, so that the image information of the original document (FIG. 4a) is lost. It is possible to select the recording paper (FIG. 4b) according to the size of the original document (FIG. 4a) without causing the original document (FIG. 4a). When the decoding mode is selected, the address conversion table is sorted according to the size of the original (FIG. 4b) to be read, so that the original original (FIG. 4a) image is faithfully reproduced (FIG. 4c). Figure) can. Referring again to FIG. 8, the system control unit 10
4 writes the address conversion table T '(i) or T "(i) obtained by the processing described above into the RAM 251 shown in FIG.
An encryption designation signal, an encryption / decryption signal, a decryption designation signal, a mark start signal, a mark end signal, and an area end signal shown in the figure are set (12). Next, the system control unit 104 controls the copy operation under the set conditions (14), and when this is completed, displays a message as necessary (15) and displays the standard screen again (2). Although the embodiment described above is the case where the blocks divided in the main scanning direction are rearranged, the present invention is also applicable to the case where the blocks divided in the main scanning direction and the sub-scanning direction are rearranged. [Effects of the Invention] As described above, according to the present invention, when an image (original document) that can be read or viewed by a person is encrypted and recorded, the encryption order is set according to the size of the recording medium. The encrypted image can be recorded by exchanging the pixel positions suitable for the size of the recording medium without omission of the original image. When restoring (reproducing) the encrypted image to the original document image, the decoding order is set according to the size of the document, that is, the recording medium on which the encrypted image is recorded. Since both the encryption order and the decryption order are uniquely set according to the size of the medium (the original when this is a decryption record), they are always consistent, and there is a disorder between encryption and decryption. Does not occur. In addition, by setting in advance the encryption order and the decryption order that are optimal for the size of the recording medium on which the encrypted image is to be recorded, it is possible to prevent recording omission and recording of only a small portion of the paper in advance.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an outline of the structure of a mechanical section of a digital copying machine incorporating one embodiment of the present invention. FIG. 2 is a block diagram showing an outline of a configuration of an electric unit of the copying machine shown in FIG. FIG. 3 is a plan view of the operation display unit 106 shown in FIG. FIG. 4a is a plan view showing an original document to be encrypted and recorded by the copying machine shown in FIG. 1, FIG. 4b is a plan view showing a recording sheet on which the encrypted document is recorded, and FIG. FIG. 3 is a plan view showing a recording sheet obtained. FIG. 5 is a block diagram showing a configuration of the encryption / decryption circuit 124 shown in FIG. FIG. 6 is a block diagram showing a configuration of the line buffer circuit 125, the mark detection circuit 126, the address management circuit 127, and the mark addition circuit 128 shown in FIG. FIG. 7 is a block diagram showing a configuration of the LUT circuit 222 shown in FIG. FIG. 8 is a flowchart showing the processing operation of the system control unit 104 shown in FIG. 9a, 9b and 9c are plan views showing an example of the display screen of the touch panel display 166 on the operation display unit 106 shown in FIG. FIG. 10 is a block diagram showing a process of creating an address conversion table created by the system control unit 104 shown in FIG. FIG. 11 is a plan view showing an example of an address conversion table obtained by the creation process of FIG. FIG. 12 is a plan view showing the relationship between the state where the original 1 is placed on the platen 2 shown in FIG. 1 and the mark positions stored by the system control unit 104 shown in FIG. 13 is a graph showing the length in the main scanning direction of the document 1, the relationship between the standard value delta _TH slope delta tracking marks indicated by Figure 12. 1: Original, 2: Platen 3: Fluorescent light, 4: Lens array 5: CCD, 6: Polygon mirror 7: fθ lens, 8: Mirror 9: Photoconductor drum, 10: Polygon motor 11: Charger, 12: Development Unit 13: Transfer charger, 14: Separation charger 15: Cleaning unit, 16: Cassette 17: Recording paper, 18, 19: Feed roller 20: Registration roller, 21: Fixing unit 22: Tray, 23: Carriage drive motor 24: Original pressure plate 101: Scanner unit (image reading unit) 102: Image processing unit 103: Printer unit (image recording unit) 104: System control unit (sequence setting unit) 105: Synchronous control unit 106: Operation display unit (mode instruction unit) 124: encryption / decryption processing circuit (encryption processing means, decryption processing means) 125: line buffer circuit, 126: mark detection circuit 127: address management circuit, 128: mark addition circuit 160: copy start key, 161: Numeric keypad 162: chestnut Stop key 163: interrupt key 164: Set number display unit, 165: Copies display 166: touch panel display, 222: LUT circuit

Claims (1)

(57) [Claims] An image reading means for scanning an original in a main scanning direction and a sub-scanning direction and sequentially outputting an image signal for each read pixel; An encryption processing unit that outputs image signals in an encryption order different from the order in which the image signals output by the reading unit are received and received; and an image signal that is output by the image reading unit and receives the image signals in the encryption order. Decoding means for outputting an image signal in a decoding order for reproducing the image, and decoding the image represented by the image signal output by the encryption processing means when the mode designating means designates an encryption mode. Image recording means for recording, on a recording medium, an image represented by the image signal output by the decryption processing means when a mode is designated. When the mode designating means designates an encryption mode, an encryption order corresponding to the size of a recording medium is set, and when a decryption mode is designated, a decoding order corresponding to the size of a document to be read is set. An image encryption recording / reproducing apparatus, comprising: