JP3179081B2 - Image processing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[Industrial application field] The present invention relates to an image processing apparatus for encrypting / reconstructing an image signal.
In particular, scan original images that are readable or recognizable by humans.
Pixel reading in a different order from the pixel reading order
An image signal is output, and the image signal of the encrypted image is
The present invention relates to an image processing apparatus for performing a restoration process so as to reproduce an image.
You. [Prior Art] Encrypted recording / reproducing apparatus for performing image signal processing as described above
Are, for example, JP-B-63-5948 and JP-B-64-3265.
It is presented in the report. 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 yuan
Line memory that stores the image signal of the original in units of several lines
Input order and line-by-line input to the line memory.
Output order from the memory in line units.
Thus, creation and reproduction of the encrypted image are performed. There
Is a line that stores the image signal of the original document in units of several lines.
Having a memory, dividing the line memory into a plurality of blocks,
Input order of blocks to line memory and line memory
By making the output order of these blocks different,
Create and reproduce encoded images. Then, the original manuscript
Image reading scanning for encrypted recording and encrypted recorded image
Image reading scanning when restoring and recording the image of the original document
Must be exactly the same for encrypted records.
Alternatively, record the reference position mark on the recording paper in advance and decode
For encrypted recording, the encrypted image record (original) is
Accurately align the reference position mark with the original placement reference position of the image reading device
It is necessary to position according to. [Problems to be Solved by the Invention] If this is done manually, it is difficult to align,
Tends to occur. If there is a displacement, the reproducibility of the restored recorded image
Is low, that is, the image is distorted and the restored image quality is low.
Reading and recognition may be difficult. The first aspect of the present invention is to enhance the reproducibility of a restored image.
Aim. The original (encrypted image)
Easy and simple positioning on the image reading device
This is the second purpose. [Means for Solving the Problems] (1) The image processing apparatus of the present invention displays an image distributed in the main scanning direction and the sub-scanning direction.
Of the first image signal (image data) to be encrypted
Means (220, 22) for generating position information representing the corresponding position of
1); a pair of the first image signal on the surface based on the position information
Means for changing the response position (222, 125);
And the first image signal corresponding to the set position is used as the reference position mark information.
Mark adding means (223, 224, 226, 128) for converting the image into an image distributed in the main scanning direction and the sub-scanning direction.
Reference position mark represented by the second image signal to be decoded
Detecting means (126) for detecting the mark; said mark detecting means
The second image signal based on the detection of the reference position mark of (126)
A means for generating position information indicating the corresponding position of the signal on the surface
Step (220,221); of the second image signal based on the position information
Means (222, 125) for changing the corresponding position on the surface; and
And the reference position marker detected by the mark detection means (126).
For converting a second image signal corresponding to a mark into non-mark information
(223,224,226,128); In order to facilitate understanding, the figures in parentheses are
The symbols or corresponding items of the corresponding elements of the embodiment shown and described later,
Added for reference. According to this, the position information of the first image signal to be encrypted is provided.
Is generated by the generating means (220, 221), and the position information
Means for changing the position of the first image signal based on
Is changed by the mark based on the location information
The adding means (223, 224, 226, 128) is the first means corresponding to the set position.
The image signal is converted into reference position mark information. By this
The image signal obtained by the
Each part of the image moves to a different location and the original image cannot be read
Image that becomes an image and has a reference position mark at the set position
And an image based on the encrypted image signal.
When an image is formed, the reference position is
An image with the placement mark is obtained. An image signal representing such an image, that is, an encrypted image.
If the signal is a second image signal, the mark detection means (126)
Detecting a reference position mark from the second image signal;
Generate position information of the second image signal based on the quasi-position mark
A step (220,221) occurs and the change means (222,125)
Since the position of the second image signal is changed based on the position information,
This position change reverses the position change of the first image signal.
In this case, the second image signal has the same rank as the first image signal.
Is converted to an image signal. Means for converting to non-mark information (223,224,226,128)
Is the reference position mark detected by the mark detection means (126).
Convert the corresponding second image signal to information that does not indicate a mark
Therefore, the reference position mark disappears, and the same as the first image signal.
A restored image signal representing an image such as
When an image is formed based on a signal, the first image signal is represented.
An image equivalent to that of the image is obtained. That is, it is necessary only during the restoration processing of the encrypted image signal.
The first image signal in which the reference position mark for alignment has been deleted.
An image equivalent to the image represented by the symbol
Reality is high. As described above, the first image signal to be encrypted (the original image signal)
Image signal) includes the reference position mark and indicates the position of each part of the image.
Represents a modified image, i.e. converted to an encrypted image.
If this encrypted image is formed on paper,
The reading mark appears, so the image reading device
Easy to position on the image reading device
It can be simplified. Embodiment of the Invention (2) Means for changing the corresponding position of the first image signal (22)
2, 125) the position change processing is performed on the set position and original
Means (127) for restricting to an area defined by the size of
The image processing device (102) according to (1) above. When the image encryption adds the reference position mark
Since it is performed only in the area specified by the size of the manuscript,
Even if the first image signal is slightly shifted with respect to the sub-position,
Margins (outside the defined area of the reference position mark)
Encryption processing is not applied. That is, the margin is encrypted
Changing the order of images (pixels) has no effect. as a result,
Faithfully represents the original image from the encrypted image signal
Image signals can be restored. As a result, the reproducibility of the restored image
Get higher. (3) The reference position detected by the mark detection means (126)
When the mark is displaced from the reference line (Fig. 12),
The relationship that the quasi-position mark is at a predetermined position with respect to the reference line
Correction means (220, 22) for correcting the position of the second image signal.
The image processing apparatus (102) according to the above (1), comprising: According to this, the position of the second image signal relative to the reference position is determined.
An image signal with automatically corrected misalignment is obtained.
Since the decoding process is performed, the restored image signal is
Despite the displacement of the image signal, an image without displacement
And the reproducibility of the restored image is high. (4) means for changing the corresponding position of the second image signal (22
2,125) by the mark detection means (12
6) Specify the reference position mark detected by
Means (127) for regulating the area to be defined;
(1) The image processing device (102). According to this, the reference position mark is positioned at the top and bottom of the image plane.
Even if only one position of the edge, the left edge or the right edge,
The size of the image automatically defines the encrypted image restoration area
Therefore, the process of determining the encryption restoration area is easy and simple.
In addition, the reproducibility of the restored image is high. In addition, encryption recovery
No recording omissions (cut images) according to the size of the area
Properly select the restoration recording size so that recording is performed
be able to. (5) Scan the original in the main scanning direction and sub-scanning direction and read
And sequentially output the image signal of each pixel as a second image signal.
Image reading means (101); and said mark detection
The image reading of the reference position mark detected by the means (126).
With respect to the reference line (FIG. 12) of the reading area of the reading means (101).
The reference position mark corresponds to the reference line corresponding to the angle difference.
The reference position mark and the reference line are placed in a predetermined position.
Angle adjustment means (112,113) for adjusting the angle between
The image processing apparatus (101, 102) according to the above (1). According to this, the reference position of the image reading means (101) can be adjusted.
Automatically corrects misalignment of scanned originals (encrypted images)
Since this is subjected to decryption processing, the position of the original is shifted.
And a faithful original document image is restored and recorded. 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.
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 carriage not shown
Sometimes driven 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.
And the polygon motor 10 rotated at a constant speed
The polygon mirror 6 is driven to rotate. Polygon mirror 6
Due to the rotation, the laser light is directed in the rotation direction (time
Direction), that is, along the drum axis
Scanned. 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.
The photoreceptor surface charge on the drum body
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. Thereby, the photosensitive drum 9
Is formed on the surface of the document 1 in accordance with the density of the document 1.
When this electrostatic latent image is developed by the developing unit 12, the photosensitive
A toner image is formed on the surface of the body 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.
23, an angle adjustment motor 11 for changing the angle of the carriage
3 and a motor control circuit 112 that controls the rotation of the motor.
I do. 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, recess 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
Non-encrypted areas of the area are copied as is.
It is. 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 line buffer circuit 125 shown in FIG.
Detection circuit 126, address management circuit 127 and mark addition
4 shows a configuration of a circuit 128. Referring to FIG. 6, the image data signal is a mark detection signal.
Shift register of serial input / parallel output of circuit 126
Input to the NAND gate 203, and the output is given to the NAND gate 203.
You. Therefore, the NAND gate 203 outputs the H level image data.
When the signal is continuous for m pixels, an L-level signal is output.
You. 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 pixel 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
Connected to the input terminal of selector 216 as 13 data terminals
ing. 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. RAM212 and RA
The pixel clock signal input to M213 is
Used as a write clock for the RAM 213. 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. Referring to FIG.
Then, the LUT circuit 222 selects the selector 250, the RAM 251 and the 3-ST
It is composed of buffer 252 of ATE output 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 applied to the line buffer circuit 125.
Can be On the other hand, the system control unit 104
When rewriting, the selector
250 selects the address signal and buffer 252 selects the data signal
Output to RAM 251, and RAM 251 is set to a writable state.
You. In this state, the system control unit 104
Instruction) output the signal, the address signal specifies
Data specified by the data signal at the specified address.
Is written to the RAM 251 and the contents of the LUT circuit 222 are changed.
You. 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 goes low.
The bell indicates the output of counter 221 during decryption copy.
When the force is below the mark end signal and the mark detection circuit 126
Detects a mark (mark detection signal = H level)
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 on the numeric keypad.
4 digits are input, and then the "End" display section is pressed
When done, complete. The system control unit 104 completes the input of the encryption code.
When done, set the encryption mode, and thus this series
Decrypt if decryption mode was set before operation
Cancel the encryption mode, set the encryption mode, and
Address conversion table according to the encryption code entered in
And display the standard input screen as shown in Fig. 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 input screen display state shown in FIG.
-) Is pressed, the decryption mode is set.
When the “encrypted copy” display area is pressed
Similarly, encryption code input processing and address conversion tables
Processing such as creation is performed (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 illustrated in FIG. 10, the system control unit 104
Converts the input encryption code with the above code table,
Obtain two numbers X (= 3) and Y (= 5). next,
By performing the operation shown in the equation (1), the address conversion table T
The values of all elements of (i) are calculated. In the formula (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, Y =
When the address translation table of FIG. 5 is created,
An address conversion table as shown in FIG. 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.
(5,7,17,2). 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 above-mentioned slope Δ, 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 count value is no longer automatically corrected.
It is 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 may
Display a message and return to the standard screen (10,17,
2). That is, the substantial recording operation of the copying machine does not start.
Then, it is in a state of waiting for a key input. 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 is set
The copy operation is controlled according to the conditions (16), and this ends.
Message is displayed as necessary (17), and the standard screen is displayed.
The surface 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 1 ≦ T (i) ≦ 9 within the image range are sequentially extracted, and these are sequentially allocated to T ′ (i) (1 ≦ i ≦ 9), The elements 11 ≦ T (i) ≦ 15 are also extracted in order, and these are sequentially assigned to T ′ (i) (11 ≦ i ≦ 15), and the address conversion table T as shown in FIG. '(I). 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 an address conversion table T "(i) for performing reverse conversion of the address conversion table T' (i) is obtained by the following equation. 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 above-described processing 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, when the decoding mode is selected (14), the system control unit 104 performs the carriage angle adjustment control (15). In the angle adjustment control, a command corresponding to the inclination Δ of the tracking mark obtained from the data of the mark position is given to the motor control circuit 112 of the scanner unit 101 to drive the angle adjustment motor 113, and the direction of the carriage, that is, the main scanning The control is performed so that the scanning direction is orthogonal to the tracking mark written on the document. This allows
The processing block in the decrypted copy matches the processing block at the time of the encrypted copy, so that it is possible to prevent the reproduction image from deteriorating due to the displacement of the block. FIG. 14 is a view schematically showing a mechanism of the scanner unit 101. Referring to FIG. 14, a carriage 30 includes a fluorescent lamp 3, a lens array 4, and a CCD reading plate 31 on which a CCD 5 (not shown) is mounted. Drive wires 33 and 34 wound around a pulley 32 fixed to the shaft of the carriage drive motor 23 are respectively coupled to the carriage 30.The forward / reverse rotation of the carriage drive motor 23 causes the carriage 30 to move, and the original Scanning is performed in the scanning direction. Also,
Pulleys 35 and 36 for suspending the drive wire 34 are fixed to an angle adjustment stage 37, and are configured so that the angle adjustment stage 37 finely moves in the same direction as the carriage 30 by the forward / reverse rotation of the angle adjustment motor 113. Have been. Therefore, the system control unit 104 instructs the motor control circuit 112 of the scanner unit 101 to issue an angle adjustment motor 11
By rotating 3, the angle adjustment stage 37 and pulley 35,
Drive wire to which the carriage 30 is connected in conjunction with 36
34 also moves, and the angle between the moving direction of the carriage 30 and the carriage 30 including the CCD 5 and the like can be changed. That is, the relative angle between the scanning direction in the main scanning direction and the document placed on the platen is changed. Further, the angle reference sensor 38 is connected to the system control unit 10.
Reference numeral 4 denotes a sensor for detecting a standard position of the angle control stage 37 (a position where the moving direction of the carriage 30 is perpendicular to the carriage 30). As described above, by detecting the inclination Δ of the tracking mark and correcting the inclination Δ by the angle adjustment control, the scan line at the time of decryption copy can be made to coincide with the scan line at the time of encryption copy. As a result, a good reproduced image with little deviation can be obtained. Also, in the decrypted copy of this embodiment, as described above,
Based on the image signal output by the scanner unit 101, detects a mark for reference position detection described on the document,
Since the received image signal is divided into blocks and processed based on the detection result, a good reproduced image with less deviation can be obtained (15). Note that, since the angle adjustment control is a control unique to the decryption copy, when the control of the copy operation of the decryption copy ends, the system control unit 104 instructs the motor control circuit 112 to move the angle adjustment stage 37 to the standard position. Move to In the present embodiment, the angle of the entire carriage with respect to the document is adjusted. However, the present invention is only required to change the relative angle between the scanning direction in the main scanning direction and the placed document when reading the document. For example, change the angle of a CCD only, a CCD and a lens array, etc. with respect to the original, or change the CCD
Alternatively, the angle may be adjusted by rotating the document itself while fixing the angle. Referring again to FIG. 8, the system control unit 10
Next, control the copy operation under the set conditions (1
6) is performed, and when this is completed, a message is displayed if necessary (17), and the standard screen is displayed 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 applicable to the case where the blocks divided in the main scanning direction and the sub-scanning direction are rearranged, or in units of lines or a plurality of The present invention can also be applied to a case where the rearrangement order of blocks is changed for each line unit. [Effect of the Invention] (1) As described above, the image processing apparatus (102 or 1
According to (01 + 102), only the area defined by the reference position mark of the encrypted image represented by the second image signal is decrypted, that is, only the encrypted image portion is automatically and accurately extracted, and only this portion is extracted. Since the encrypted image is decrypted, even if the encrypted image is slightly displaced from the reference position, the decryption processing is not applied to the blank portion (outside the reference region mark defined area) including the displaced portion. That is, the image (pixel) position change in the decoding order does not act on the margin. As a result, the decoded image signal faithfully represents the encryption section of the original image. As a result, the reproducibility of the restored recorded image is high. Also,
The restored image (a copy of the original document) in which the reference position mark included in the encrypted image has been deleted is reproduced, and the fidelity of the restored image is high. The first image signal to be encrypted (the image signal of the original document)
An image that includes a reference position mark and represents an image obtained by changing the position of each part of the image, that is, is converted into an encrypted image. If this encrypted image is formed on paper, the reference position mark appears. When attached to the reading device, positioning to the image reading device can be easily and simply performed. (2) Since the image encryption is performed only in the area defined by the set position where the reference position mark is added and the size of the document, even if the first image signal is slightly shifted from the reference position, the amount of the shift can be reduced. The encryption process is not applied to the included blank portion (outside the defined area of the reference position mark). That is, the image (pixel) position change in the encryption order does not act on the margin. As a result, an image signal representing the original image can be faithfully restored from the encrypted image signal. As a result, the reproducibility of the restored image is improved. (3) An image signal in which the misalignment of the encrypted image (original document) with respect to the reference position is automatically corrected is obtained, and the image signal is subjected to a decryption process. Despite the positional deviation, there is no deviation, and the original image is faithfully restored. (4) Even if the reference position mark is only one position of the upper end, the lower end, the left end or the right end of the original, the encrypted image area is automatically defined by the original and the size of the original. It is easy and simple, and the reproducibility of the restored image is high. In addition, according to the size of the encryption area, the restoration size can be appropriately selected so that recording without recording omission (image cutout) is performed. (5) Since the misalignment of the encrypted image (original) with respect to the reference position of the image reading means (101) is automatically corrected and subjected to a decryption process, there is no misalignment of the encrypted image. The original image is faithfully restored.

[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 examples 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. FIG. 14 is a perspective view schematically showing a mechanism of the scanner unit 101 shown in FIG. 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, 30: Carriage 31: CCD reading plate, 32, 35, 36: Pulley 33, 34: Drive wire, 37: Angle adjustment stage 38: Angle reference sensor, 101: Scanner unit 102: Image processing unit, 103: Printer Unit 104: System control unit, 105: Synchronization control unit 106: Operation display unit, 112: Motor control circuit 124: Encryption / decryption processing circuit, 125: Line buffer circuit 126: Mark detection circuit, 127: Address management circuit 128 : Mark addition circuit, 160: Copy start key 161: Key, 162: clear stop key 163: interrupt key, 164: set number display 165: copy quantity display unit, 166: touch panel display 222: LUT circuit

Claims (5)

(57) [Claims] A means for generating position information indicating a corresponding position on the surface of a first image signal to be encrypted representing an image which is surface-distributed in the main scanning direction and the sub-scanning direction; Means for changing the corresponding position of the first image signal on the surface; mark adding means for converting the first image signal corresponding to the set position into reference position mark information based on the position information; in the main scanning direction and the sub-scanning direction Mark detecting means for detecting a reference position mark represented by a second image signal to be decoded, which represents an image distributed on the surface; a mark on the surface of the second image signal based on the detection of the reference position mark by the mark detecting means; Means for generating position information indicating the corresponding position of the second image signal; means for changing the corresponding position of the second image signal on the surface based on the position information; and second means corresponding to the reference position mark detected by the mark detecting means. Image signal Means for converting into non-mark information. 2. The image according to claim 1, further comprising: means for restricting the position change processing of the means for changing the corresponding position of the first image signal to an area defined by the set position and the size of the document. Processing equipment. 3. The position of the second image signal is corrected so that the reference position mark is at a predetermined position with respect to the reference line in accordance with the deviation of the reference position mark detected by the mark detection means from the reference line. The image processing apparatus according to claim 1, further comprising: a correction unit configured to perform the correction. 4. A means for restricting the position change processing of the means for changing the corresponding position of the second image signal to an area defined by a reference position mark detected by the mark detection means and a size of a document. The image processing apparatus according to claim 1. 5. An image reading means for scanning and reading an original in a main scanning direction and a sub-scanning direction, and sequentially outputting an image signal for each pixel as a second image signal; and a reference position mark detected by said mark detecting means. Adjusting the angle between the reference position mark and the reference line so that the reference position mark is at a predetermined position with respect to the reference line in accordance with the angle difference between the reading area of the image reading unit and the reference line. The image processing apparatus according to claim 1, further comprising: an angle adjustment unit that performs the angle adjustment.