JPH03183266A - Restoring recorder for ciphered picture - Google Patents

Abstract

PURPOSE:To improve the reproducibility of a restored and recorded picture by detecting the reference position mark of an original (ciphered picture) and limiting the decoding processing to the area prescribed by the detected reference position mark. CONSTITUTION:A tracking area and a tracking mark are added at the time of ciphering copy(ciphering mode), and an erased area is added at the time of decoding copy (decoding mode). When the ciphering mode is selected, the contents of an address conversion table are sorted in accordance with the size of recording paper for recording. When the decoding mode is selected, the contents of the address conversion table are sorted in accordance with the size of the original to be read. When the decoding mode is selected, a system control unit 104 adjusts and controls the angle of a carriage. Thus, the block of processing for decoding copy coincides with that for ciphering copy to prevent the degradation of the reproduced picture due to deviation between blocks.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a recording device that performs encrypted recording/restored recording of images, and in particular, the present invention relates to a recording device that performs encrypted recording/restored recording of images, and in particular, reads an original image that can be read or recognized by humans by dividing it into pixels with a scanner. The present invention relates to a restoration recording device that reproduces an original image from an encrypted image in which image signals are recorded (encrypted and recorded) in a darkening order different from that of pixel reading.

[Conventional technology]

The above-mentioned encrypted recording/reproduction device is, for example,
This is disclosed in Japanese Patent Publication No. 5948 and Japanese Patent Publication No. 64-3265.

This type of encrypted playback device has two page memories that can store image signals obtained by reading the entire image (original document) that can be read or recognized by humans, and a two-dimensional The encrypted image is created and reproduced by exchanging the image signals. Alternatively, by having a line memory that stores the image signal of the original document in units of several lines, and by making the input order of each line to the line memory different from the order of outputting each line from the line memory, the encrypted image can be Create and play. Alternatively, it has a line memory that stores the image signal of the original document in units of several lines, divides the line memory into multiple blocks, and makes the input order of blocks to the line memory and the output order of blocks from the line memory different. This creates and plays encrypted images. Therefore, it is necessary to completely match the image reading scan when encrypting the original document and the image reading scan when restoring and recording the image of the original document from the encrypted recorded image. Alternatively, record a reference position mark on the recording paper in advance, and when recording decryption, accurately align the reference position mark of the encrypted image recording paper (M manuscript) with the document placement reference position of the image reading device. position.

[Problem to be solved by the invention]

If this is done manually, alignment will be difficult and a one-position deviation will easily occur. If there is a positional shift, the reproducibility of the restored recorded image will be low, that is, the image will be disturbed, the quality of the restored image will deteriorate, and reading or recognition may become difficult.

An object of the present invention is to facilitate and simplify the positioning of a document (encrypted image) to an image reading device during decryption recording, and to improve the reproducibility of restored recorded images.

(Means for solving the problem if! II) The first s of the present invention
The restoring recording device includes an image reading means (101) that scans an original (encrypted image) in the main scanning direction and the sub-scanning direction and sequentially outputs an image signal for each read pixel, and 5 image reading means (101). a decoding processing means (124) for receiving image signals to be output and outputting the image signals in a decoding order different from the order in which they were received; In an encrypted image restoration recording device comprising an image recording means (103) for recording, a document (
The mark detection means (1, 26) detects the reference position mark (FIG. 4b) of the darkening image), and the mark detection means (126) detects the detrinization process of the decoding processing means (124). A de9ization area restriction means (127) is provided for restricting the area to the area defined by the reference position mark.

[Effect l]

According to this, only the area defined by the reference position mark of the original (encrypted image) is decrypted, that is, only the encrypted image part is automatically and accurately extracted and only this part is decrypted. Therefore, even if the document is slightly shifted from the reference position of the image reading device, the decoding process is not applied to the margin area (outside the defined area of the reference position mark) that includes the shift. In other words, changing the image (pixel) position in the decoding order does not affect the blank space. As a result, the decrypted image signal faithfully represents the encrypted portion of the original image. As a result, positioning of the document (encrypted image) on the image reading device during decryption recording can be made easy and simple, and the reproducibility of the restored recorded image is high.

In addition to the first fm, the restoration recording device according to the second aspect of the present invention includes an image reading means (101,
mark image erasing means for erasing the image signal of the reference position mark from the image signal outputted by the apparatus.

[Effect 2] According to this, it is recorded on the encrypted recording paper, and the secret Q
A restored image (a copy of the original document) is reproduced in which the reference position mark for alignment, which is necessary only when recording an image, is erased, and the fidelity of the restored image is high.

The restoration recording apparatus according to the 3111th aspect of the present invention includes a mark detection means (126) for detecting a reference position mark (FIG. 4b) on a document from an image signal outputted by an image reading means (IOL);
and base 11 of the reading area of the reading means (101) for two images of the reference position mark detected by the mark detection means (126).
! The reading image position is adjusted so that the position of the image signal output by the image reader [(lot) is corrected so that the reference position mark is at a predetermined position with respect to the reference line (FIG. 12). A correction means (220, 221) is provided.

[Operation 3] According to this, an image signal in which the misalignment of the original (encrypted image) with respect to the reference position of the image reading means (101) is automatically corrected is obtained, and the image signal is subjected to decoding processing. Therefore, despite the misalignment of the original, a decoded image (image of the original original) with no misalignment is reproduced and recorded on the recording medium, and the same faithful original image as when the original is not misaligned is reproduced. The original image is restored and recorded.

The restoration recording device according to the fourth aspect of the present invention includes an image reading means (1
01), the reference position mark (
4b), and the reference position mark detected by the mark detection means (126) and the size of the original (encrypted image) decoding area restriction means (127) for restricting the decoding area to an area defined by .

[Effect 4] According to this, the reference position mark is at the top of the document.

Even if there is only one position at the bottom, left, or right edge, the encrypted image recording area is automatically defined based on that position and the size of the document, making the process of determining the encrypted recording area easy and simple, and making it possible to restore and record the image. High image reproducibility. In addition, depending on the size of the encrypted recording area, recording leaks (image cuts) may occur.
The restoration recording size can be appropriately selected so as to record without any errors.

The restoration recording device according to the fifth aspect of the present invention includes image reading means (1
01), the reference position mark (
mark detection means (126) for detecting the reference position mark detected by the mark detection means (126), and the reference 41 (
An angle I111 means (
112, 113).

[Operation 5] According to this, the misalignment of the original (encrypted image) with respect to the reference position of the image reading means (101) is automatically corrected, and decoding processing is performed on this, so that the position of the original is corrected automatically. A faithful image of the original manuscript is restored and recorded.

Note that the symbols in parentheses above indicate corresponding elements in the embodiments shown in the drawings and described later.

Other objects and features of the present invention will become apparent from the following description of embodiments with reference to the drawings.

〔Example〕

FIG. 1 shows an outline of the structure of a mechanical part of a digital copying machine incorporating an embodiment of the present invention, and FIG. 2 shows an outline of the arrangement of an electrical part of the copying machine shown in FIG.

First, referring to FIG. 1, the mechanical parts of the digital copying machine are as follows:
a scanner unit 101 that mainly reads images of originals;
It is divided into a printer unit 103 that records images on recording paper.

A document 1 is placed on a platen (contact glass) 2 and illuminated by a fluorescent lamp 3. The reflected light from the original 1 passes through the lens array 4 and is sent to the CCD, which is a line image sensor.
5. Fluorescent lights 3. Lens array 4 and CCD
5 is mounted on a carriage (not shown), and the original l
When reading, the carriage drive motor 23 drives the document 1 from right to left to scan the entire surface of the document 1 placed on the platen 2.

Referring to FIG. 2, the reflected light from the original 1 is reflected by the CCD 5.
The signal is converted into an electrical signal, subjected to necessary processing in the scanner unit 101 and the image processing unit 102, and input to the LD (laser diode) drive circuit 130 of the printer unit 103.

The LD drive circuit 130 energizes the LD131 and
A modulated laser beam is emitted from 31.

Referring again to FIG. The laser light emitted from the LD 131 is reflected by the polygon mirror 6, passes through the fθ lens 7 and the mirror 8, and is irradiated onto the photoreceptor drum 9 to form an image.

The polygon mirror 6 is fixed to the rotating shaft of a polygon motor 10, and the polygon motor 1O rotates at a constant speed to drive the polygon mirror 6 to rotate.

As the polygon mirror 6 rotates, the laser beam is scanned in a direction perpendicular to the rotation direction (clockwise) of the photoreceptor drum 9, that is, in a direction along the drum axis.

The surface of the photosensitive drum 9 is uniformly charged by a charger 11 connected to a negative voltage high voltage generator (not shown). When the surface of the photoreceptor is irradiated with the modulated laser light, charges on the surface of the photoreceptor flow to the equipment ground of the drum body and disappear due to a photoconductive phenomenon. Here, the laser is not turned on in areas where the original density is high, and the laser is turned on in areas where the original density is low. As a result, the photoreceptor drum 9
An electrostatic latent image is formed on the surface of the document 1 according to the density of the document 1.

When this electrostatic latent image is developed by the developing unit 12, a toner image is formed on the surface of the photoreceptor drum 9.

On the other hand, the recording paper 17 stored in the cassette 16 is fed out by the paper feeding operation of the paper feeding roller 18, and
0, it is sent in the direction of the photosensitive drum 9 at a predetermined timing. While the recording paper 17 passes under the photosensitive drum 9, the toner image is transferred to the recording paper 1 by the action of the transfer charger 13.
7, and the recording paper 17 is separated from the photosensitive drum 9 by the action of the separation charger 14.

The peeled recording paper 17 is sent to a fixing unit 21, where the transferred toner is fixed to the recording paper I7, and the recording paper 17 with the toner fixed thereon is discharged to a tray 22.

Further, the toner remaining on the surface of the photoreceptor even after the transfer is removed by the cleaning unit 15.

Referring again to FIG. The electrical components of the digital copying machine mainly include a scanner unit 1011 that reads a document 1 and outputs an image data signal; an image processing unit 1022 that processes the image data signal; a printer unit 103 that performs recording based on the image data signal; A synchronization control unit 105 that generates signals and aligns the timing of signal transmission and reception between each unit and between each element within the unit. An operation display section 106 for inputting and displaying various processing modes, and a system control unit 10 for controlling these units, etc.
It is composed of 4 etc.

In the scanner unit 101, the signal output from the CCD 5 is converted into an 8-bit digital signal by the A/D conversion circuit 110, and the signal is converted to an 8-bit digital signal by the shading correction circuit 111.
is input.

The shading correction circuit 111 is a circuit that performs corrections for uneven illuminance of the fluorescent lamp 3, uneven sensitivity of the light receiving element inside the CCD 5, and dark current.

The scanner unit 101 also includes a carriage drive motor 23, an angle adjustment motor 113 that changes the angle of the carriage, and a motor control circuit 1 that controls the rotation of the motor.
It has 12.

The image data signal output from the shading correction circuit 111 is sent to the MTF correction circuit 1 of the image processing unit 102.
20 is input.

The MTF correction circuit 120 is a circuit that performs filter processing on the input image data signal, and increases the sharpness of the image and removes noise.

The image data signal output from the MTF correction circuit 120 is input to the scaling processing circuit 121.

The magnification processing circuit 121 enlarges/reduces the input image data signal in the main scanning direction (the direction in which the CCDs 5, which are line image sensors, are lined up). Also, the sub-scanning direction (direction perpendicular to the line of CCD 5, which is a line image sensor)
The enlargement/reduction of is performed by controlling the rotational speed of the carriage drive motor 23 shown in FIG.

The image data signal output from the scaling processing circuit 121 is
Binarization processing circuit 122 and original size detection circuit 123
is input.

The binarization processing circuit 122 is a circuit that performs dither processing on the 8-bit multivalued image data signal output from the scaling processing circuit 121 and outputs a binary image data signal. Further, the original size detection circuit 123 detects the density difference between the original l placed on the platen 2 and the original pressure plate 24, and
This is a circuit that detects the size of .

The 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 processes the input image data signal (
This circuit changes the input/output order of image data.

The image data signal output from the encryption/decryption processing circuit 124 is input to the LD drive circuit 130 of the printer unit 103.

The LD drive circuit 130 adjusts the LD1 according to the image data signal while correcting fluctuations in laser light output due to temperature and the like.
31 and causes the LD 131 to emit a modulated laser beam.

The system control unit 104 also includes a CPU 140° ROM 141. RAM142 and I10 port 143
This is a microcomputer system that controls the entire copying machine.

FIG. 3 shows the appearance of the operation display section 106 shown in FIG. 2. Referring to FIG. 3, the operation display section 106 includes a copy start key 160. Numeric keypad 161. Clear/Stop key 1622 Interrupt key 163. Set number display 164. A copy number display 165 and a touch panel display 166 are provided.

The touch panel display 16G is provided with a panel in which a large number of transparent contact detection switches are arranged on the display surface of the display, and the display section and the operation section are integrated. In other words, the touch panel display 166 performs selection of various operation modes and display of associated input guidance.

4a, 4b, and 4c show an example of the encryption/decryption process of the copying machine shown in FIG. 1. FIG. FIG. 4a shows the original manuscript, FIG. 4b shows an encrypted copy of the original original (encrypted image), and FIG. 4c shows a reproduced image obtained by decrypting and copying the encrypted image.

As shown in Figure 4a, the original document can be divided into a valid image area and an invalid image area in the main scanning direction, and the valid image area can be further divided into an encrypted area and a non-encrypted area. are processed differently. In other words, the encrypted area of the effective image area is divided into a plurality of blocks (blocks 1 to 4) in the main scanning direction, and as shown in the encrypted image in FIG.
) are rearranged in the output order and encrypted so that the contents of the original manuscript cannot be easily recognized. In addition, areas of the valid image area that are not encrypted areas are copied as is.

On the other hand, in the invalid image area, the image is erased and becomes a tracking area, and a tracking mark is further added.

In the reproduced image shown in FIG. 4c, the order of the blocks (1 to 4) that had been replaced is restored, the tracking mark added to the tracking area is erased, and
The image of the original document shown in Figure a is reproduced. The tracking mark is added as a mark indicating the boundary of blocks (1 to 4), and this mark is detected during decoding,
Determine the boundaries of blocks (1 to 4) based on that,
Change the output order.

FIG. 5 shows the encryption/decryption processing circuit 124 shown in FIG.
The configuration is shown below. Referring to FIG. 5, an image data signal from the outside (binarization processing circuit 122) is input to a line buffer circuit 125 and a mark detection circuit 126.

The mark detection circuit 126 is a circuit that detects tracking marks during decryption copying (FIG. 4b→FIG. 4c).
The position where the mark is detected is output to the address management circuit 127.

The line buffer circuit 125 is composed of a memory, etc., and is a circuit that stores one line or several lines of image data signals from the outside and outputs the stored image data signals to the mark adding circuit 128.

The address management circuit 127 includes the line buffer circuit 125
This is a circuit that outputs the write address and read address of the memory, etc. during encrypted copying (Fig. 4a → Fig. 4b) and decrypted copying (Fig. 4b) as shown in Figs. 4a, 4b, and 4c. It also controls the replacement of blocks (1 to 4) during the process of FIG. 4b→FIG. 4c, and controls the addition/deletion of tracking areas and tracking marks.

The replacement of blocks (1 to 4) (execution of encryption order and decryption order) is realized by making the order of generation of write addresses and read addresses different.

Further, the write address (or read address) at the time of decryption copying is output based on the output of the mark detection circuit 126.

The mark addition circuit 128 is a circuit that adds a tracking area and a tracking mark during encrypted copying, and erases the tracking mark during decrypted copying, and outputs an image data signal subjected to these processes. Further, the operation timing of these processes is performed based on the output of the address management circuit 127.

FIG. 6 shows the line buffer circuit 125, mark detection circuit 126, . . . shown in FIG. Referring to FIG. 6, which shows the configuration of the address management circuit 127 and the mark adding circuit 128, one image data signal is input to a serial input/parallel output shift register 200 of the mark detection circuit 126, and its output is sent to a NAND gate 203. given to. Therefore, the NAND gate 203 outputs an L level signal when the image data signal of the I level continues for m pixels.

Also, the output of the final stage of the shift register 200 is as follows.

It is also applied to a serial input/parallel output shift register 201 via an inverter 202, and the output of the shift register 201 is applied to a NAND gate 204. Therefore, the NAND gate 204 outputs an L level signal when the L level image data signal continues for n pixels.

Furthermore, the outputs of NAND gates 203 and 204 are NO
It is input to the R gate 205, and the NOR gate 205
This is the mark detection signal. Therefore, the mark detection signal becomes H level when the L level image data signal continues for n pixels or more, and then the H level image data signal continues for m images.

Such a series of image data signals is input when the tracking mark start position of the encrypted image shown in FIG. 4b is scanned, and the mark detection circuit 126 detects the tracking mark start position.

Further, the image clock signal input to the mark detection circuit 126 is a synchronization signal of one image data signal, and is used as a clock signal for the shift registers 200 and 201.

On the other hand, the image data signal is input to the buffers 210 and 211 of the 3-5TATE output of the line buffer @ path 125, and the outputs of the buffers 210 and 211 are connected to the input terminal of the selector 216 as data terminals of the RAM 212 and 213, respectively. has been done.

The RAMs 212 and 213 can each store 1947 minutes of image data, and the write address signal and read address signal output from the address management circuit 127 are sent to the respective RAMs 212 and 213 via selectors 214 and 215. is input.

Each element of the line buffer circuit 125 performs a toggle operation for each line, and this control is performed by the toggle control circuit 217.
It is done by. That is, when writing an image data signal to the RAM 212 and reading the image data signal from the RAM 213, the buffer 210 is operated by the toggle control circuit 217 to input the image data signal to the RAM 212. At this time, the output of the buffer 211 is in the Ht impedance state. The selector 214 selects the write address signal and outputs it to the RAM 212,
The selector 215 selects the read address signal and sends it to RA.
Output to M213.

The RAM 212 is set to write mode, and the image data signal output from the buffer 210 is sent to the selector 214.
is written to the address output by The read mode of the RAM 213 is selected, and the image data signal at the address output by the selector 215 is input to the selector 216.

The selector 216 selects and outputs the image data signal output from the RAM 213. When writing an image data signal to the RAM 213 and reading an image data signal from the RAM 212, the reverse is true.

The toggle operation is switched every time a line synchronization signal is input to the toggle control circuit 217. In addition, the pixel clock signal input to RAM212 and 213 is
Used as a write clock for 212 and 213.

The address management circuit 127 includes counters 220 and 221 that clear the count value by the line synchronization signal and count the pixel clock signal, and the output of the counter 220 is used as the write address signal and
The output is converted by an LUT (look-up table) circuit 222 and output to the line buffer circuit 125 as a read address signal.

The LUT settings input to the LUT circuit 222 are as follows:
It is output from the system control unit 104, and the LU
Used to rewrite the contents of T.

FIG. 7 shows the configuration of the LUT circuit 222. Referring to FIG. 7, LUT circuit 222 is connected to selector 250. RAM2
51 and 3-5TATE output buffer 252, and during copy operation, the signal of the upper bit of the counter 221 is sent to the RAM 251 via the selector 250.
The output data of the RAM 251 and the counter 22
The signal of the lower bit of 1 is sent to the line buffer circuit 125. On the other hand, when the system control unit 104 rewrites the contents of LtJT, the mode selection signal is used.

The selector 250 selects the address signal and sends it to the buffer 252.
outputs the data signal to RAM251,
1 is set to a writable state. When the system control unit 104 outputs a WR (write instruction) signal in this state, the address specified by the address signal is
The data specified by the data signal is written into the RAM 251, and the contents of the LUT are changed.

Referring again to FIG. 6, the output of counter 221 of address management circuit 127 is also input to comparators 223, 224 and 225. Comparator 223°22
A mark start signal indicating the start position of the tracking mark, a mark end signal indicating the end position of the tracking mark, and an area end signal indicating the end position of the tracking area are input to the low input terminals 4 and 225, respectively. The outputs of comparators 223 and 224 are input to AND gate 226, and the output of comparator 225 is input to AND gate 227.

Since the AND gate 226 is also input with an encryption designation signal that becomes H level only during encrypted copying (encryption mode), the output of the AND gate 226 is at the time of encrypted copying and the output of the counter 221 starts marking. The level is 14 when the signal is higher than the mark end signal and lower than the mark end signal.

Since the AND gate 227 also receives an encryption/decryption signal that is at H level during encrypted copy (encryption mode) and decrypted copy (decryption mode), the output of the AND gate 227 is encrypted. During copying or decoding copying, the output of the counter 221 becomes H level only when it is less than or equal to the area end signal.

Also, the output of the comparator 224 is the NAND gate 22
8 is also entered.

Since the mark detection signal output by the mark detection circuit 126 and the decoding designation signal which becomes H level only during decoding copying are input to the NAND gate 228, the NAND gate 228
The reason why the output of 28 becomes L level is when decoding and copying.
This occurs only when the output of the counter 221 is less than or equal to the mark end signal and the mark detection circuit 126 detects a mark (mark detection signal=H level).

On the other hand, the LD terminal of the counter 220 has a NAND gate 2.
Since the output of 28 and the mark start signal are input to the data input terminal of the counter 220, the write address signal during decrypted copying is automatically corrected by the tracking mark added to the original (encrypted image). be done.

F/F (flip-flop) 229 is a counter 221
The output is latched by the output of the NAND gate 228 and the OR output of the pixel clock signal, and output as a mark position signal. Further, a line synchronization signal is connected to the clear terminal of the F/F 229, and the data of the F/F 229 is cleared at the beginning of each line.

Furthermore, the encryption designation signal, encryption/decryption signal, mark start signal, mark end signal, and area end signal described above are output from the system control unit 104, and the mark position signal is output to the system control unit 104. Ru.

The mark adding circuit 128 is composed of a selector 240, which selects the output of the selector 216 when the output of the AND gate 227 is at the L level, and selects the output of the AND gate 22 when the output of the AND gate 227 is at the 14 level.
6 is selected and output as an image data signal.

Therefore, a tracking area and a tracking mark are added during encrypted copying (encryption mode), and an erase area is added during decrypted copying (decryption mode). Further, during normal copying (encryption/decryption signal=L), image data No. 4 output by the selector 216 is always selected.

8 shows the processing operation of the system control unit 104 shown in FIG. 2, and FIGS. 9a, 9b, and 9c show the display on the touch panel display 166 on the operation display section 106 shown in FIG. An example screen is shown.

When the digital copying machine (FIGS. 1 and 2) is powered on, the system control unit 104 sets the processing mode etc. to the initial state, displays a standard input screen as shown in FIG. 9a on the display 166, and The system waits for key human power (subroutines 1 & 2 in FIG. 8; hereinafter, the words "subroutine" and "step" are omitted in parentheses, and only their numbers are indicated). When any key is operated in this state, a process corresponding to the operated key is executed (2).

For example, when the "Encrypted Copy J" display part of the touch panel display 166 is pressed, an encrypted code input screen as shown in FIG. ).Entering the encryption code is completed when a four-digit number is entered using the numeric keypad, and then the "end" display section is pressed.

When the input of the encryption code is completed, the system control unit 104 sets the encryption mode. Therefore, if the decryption mode was set before this series of operations, the system control unit 104 cancels the decryption mode and sets the encryption mode. 5. Next, an address conversion table is created according to the input encryption code, and a standard input screen as shown in FIG. 9c is displayed (3.4).

In FIG. 9c, the "encrypted copy" display area is shaded to indicate that the encrypted copy has been selected. Also,
In the state shown in FIG. 9b, if the "Cancel j" display part is pressed, the encryption mode is canceled and the standard input screen as shown in FIG. 9a is displayed again (3.4).

In the display state of Fig. 9a, if the "Decryption Copy J" display area is pressed, the decryption mode is set and the "Dark
In the same way as when the "Encryption Copy" display part is pressed, processing such as inputting an encryption code and creating an address conversion table is performed (3.4).

FIG. 10 shows an example of a method for creating an address translation table, and FIGS. 11a, 11b, 11c, and 1
An example of an address translation table obtained by the method shown in FIG. 10 is shown in the id diagram. In the system control unit 104, two code tables are prepared in advance in predetermined areas in the ROM 141 shown in FIG. As illustrated in FIG. 10, the system control unit 104 converts the input encryption code using the code table described above and converts it into two numbers
) and Y (=5) are obtained. Next, the calculation shown in equation (1) is performed to calculate the values of all elements of the address conversion table T(i).

T(i)=(X+YXi) mod Z(i:
0~Z-]) ...(1)(1
) In the formula, Z is the total number of elements in the address conversion table, and a number that is prime to Z is selected in advance in the code table for Y.

For example, in a circuit with a total number of elements z=16, X=3. Y
When an address translation table of =5 is created, an address translation table as shown in FIG. 11b is obtained.

In addition, although the above example shows that the code table is stored in the ROM 141 fixed in the system control unit 104,
The code table may be provided by a removable memory device such as an IC card.

Referring again to the flowchart shown in FIG.
In the display states (2 to 4) in figure a, if the operated key is copy start, the system control unit 104 checks whether the digital copying machine is in a copy enabled state, and takes appropriate action if it is in a copy disabled state. The message is displayed and the standard input screen as shown in FIG. 9a is displayed again (5, 7° 17.2). Also, when other keys are operated such as inputting the number of copies, the mode setting calculation process corresponding to the key operation is performed and the standard screen is displayed again (5°6.2).

If the operated key is the copy start key and the digital copier is ready for copying, it is checked whether pre-scanning is necessary (5, 7.8). Pre-scanning is mainly carried out by the scanner unit 101. When the image processing unit 102 is operated and the recording paper is not ejected, and the system control unit 104 determines that it is necessary to perform a pre-scan, it controls other units etc. to perform a pre-scan, Detect the known document size and document skew amount as necessary (8, 9)
.

Detection of the document skew amount is performed only when the decoding mode is selected, and the system control unit 104 operates as follows, for example. First, the decoding designation signal, mark end signal, etc. shown in the block diagram of FIG. 6 are set to predetermined values, and the scanner unit 101 is instructed to start document scanning. When the scanner unit 101 starts scanning a document, the system control unit 104 starts counting line synchronization signals, and each time the count value reaches a predetermined value,
The mark position signal output by the address management circuit 127 is read and stored. [When scanning of the document is completed, the system control unit 104 processes the stored mark position signal to evaluate the skew amount of the document.

For example, if the relationship between the document placement state on the platen and the memorized mark position is as shown in FIG. Then, the length L4 in the sub-scanning direction of the document size detected by the document size detection circuit 123 (or the length in the sub-scanning direction of the document size input from the operation section) and Ll-L2 almost match. Determine whether or not.

When L4 and LI L2 almost match, the inclination Δ of the tracking mark is determined from the mark position data. Next, a standard value ΔT is determined corresponding to the length L3 in the main scanning direction of the original size detected by the original size detection circuit 123 (or the length in the main scanning direction of the original size input from the operation unit). l (compared with the slope Δ mentioned above,
If the slope Δ is smaller than the standard value ΔTH, it is determined that the document skew amount is appropriate and decoding is possible.

If the skew amount of the document is too large, the start position of the tracking mark will be outside the set position of the mark end, and the count value of the counter 220 shown in FIG. 6 will not be automatically corrected. The length L4 in the sub-scanning direction and the length Ll-1 of the mark position signal,
, 2 to prevent the count value from not being automatically corrected.

Also, if the length of the document in the main scanning direction becomes long.

Even if the slope Δ is the same, the amount of deviation that occurs in the sub-scanning direction increases, and the proportion of low-quality reproduced images that are output increases.

For this reason, in this embodiment, the determination is made based on the standard value ΔT 11 according to the length in the main scanning direction as illustrated in FIG. ing.

Referring again to FIG. 8, if the document size cannot be detected as a result of pre-scanning or the document skew amount is inappropriate, the system control unit ton displays a corresponding message and displays the standard screen again. do (10,
17.2). In other words, the actual production of the copying machine does not start and it is in a state of waiting for key human power.

On the other hand, if prescanning is not necessary or the prescanning result is good, it is checked whether the encryption mode or decryption mode is selected (11).

If neither the encryption mode nor the decryption mode is selected, the system control unit 104 writes a standard address translation table that does not perform block replacement to the RAM 251 shown in No. 7 @ by the LUT setting signal. , and the encryption designation signal month shown in Figure 6, encryption/'
Set the 6L encoded signal, decoding specification, etc. (13)
.

Next, the system control unit 104 controls the copy operation according to the set conditions (16), and when this is finished, displays a message as necessary (17), and displays the message screen again (2). .

If encrypting mode or decrypting mode is selected, sort the address translation table (11, 12).
).

To sort the address conversion table, the image range is determined by the length of the recording paper in the main scanning direction for encrypted copying, and by the length of the document in the main scanning direction for decrypted copying, and the images are arranged within this image range. In order to complete the replacement, (1)
This is a process of reprocessing the address conversion table T(i) obtained by the formula, and thereby all of the required image information can be recorded on the recording paper.

For example, if the image range determined by the length of the recording paper in the encryption mode is as shown in FIG. 11(C), tracking is first performed from the address conversion table shown in FIG. Element part to which area is added [
O] and the element part [10] including the rear end of the image range, and set T'(i) = i (where i = 0.10) so that these element parts are not replaced. and the remaining elements within the image range.

l≦T(i)≦9 Extract these in order, T’ (i) (1≦i≦9) Assigned to and also elements outside the image range.

11≦T(i)≦15 is also extracted in order and these are sequentially assigned to T' (i) (11≦i≦15) to create an address conversion table T' ( i) obtain.

In addition, in the decryption mode, the image is rearranged in the same manner as in the encryption mode according to the image range determined by the length of the original (encrypted image), as shown in Figure 11(c). Find the address translation table T' (i),
Next, an address translation table T''(i) that performs the inverse translation of the address translation table T'(i) is determined by the following equation.

T"(T' (i)) = i (i: O"Z-
1)...(2) For example, the inverse conversion shown in FIG. 11(C) is realized by an address conversion table as shown in FIG. 11(d).

As described above, when the darkening mode is selected, the address conversion table is sorted according to the size of the recording paper (Fig. 4b) on which recording is performed, so the image information of the original document (Fig. 4a) is sorted. It is possible to select the recording paper (FIG. 4b) according to the size of the original document (FIG. 4a) without missing the original document (FIG. 4a).

In addition, when the decoding mode is selected, the address conversion table is sorted according to the size of the original to be read (Fig. 4b), so the image of the original original (Fig. 4a) is faithfully reproduced (Fig. 4a). (Figure 4c) can be done.

Referring again to FIG. 8, the system control unit 10
4 is the address translation table T' (i) or Tll (i) obtained by the process described above,
The data is written to the RAM 251 shown in FIG. 7 by the UT setting signal, and the encryption designation signal, encryption/decryption signal, decryption designation signal, mark start equal code, mark end signal and area end signal shown in FIG. Set (1
2).

Next, if the vengeance mode is selected (14),
The system control unit 104 performs carriage angle adjustment control (15).

The angle adjustment control is performed by giving a command to the motor control circuit 112 of the scanner unit lO1 according to the inclination Δ of the tracking mark obtained from the mark position data to drive the angle adjustment motor 113, and adjusting the direction of the carriage, that is, the main scanning direction. Control is performed so that the scanning direction and the tracking mark written on the vX document are perpendicular to each other. As a result, the blocks processed in the decrypted copy match the blocks processed in the encrypted copy, and deterioration of the reproduced image due to block deviation can be prevented.

FIG. 14 is a diagram schematically showing a mechanical section of the scanner unit 101. Referring to FIG. 14, fluorescent lamp 3. CC carrying lens array 4 and CCD 5 (not shown)
A D reading plate 31 and the like are mounted on the carriage 30. Drive wires 33 and 34 wound around pulleys 32 fixed to the shaft of the carriage drive motor 23 are each coupled to the carriage 30, and the carriage 30 is moved by forward and reverse rotation of the carriage drive motor 23, and the original is Scanned in the scanning direction. Furthermore, the pulleys 35 and 36 that suspend the drive wire 34 are fixed to the angle adjustment stage 37, and the angle adjustment stage 37 is slightly moved in the same direction as the moving direction of the carriage 30 by the forward/reverse rotation 1 of the angle adjustment motor 113. is configured to do so.

Therefore, when the system control unit 104 instructs the motor control circuit 112 of the scanner unit lO1 to rotate the angle adjustment motor 113, the drive wire to which the carriage 30 is connected operates in conjunction with the angle adjustment stage 37 and pulleys 35, 36. 34 also moves, and the angle between the moving direction of the carriage 30 and the carriage 30 including C0D5 etc. can be changed. In other words.

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 1
04 is the standard position of the angle adjustment stage 37! ! This is a sensor for detecting (the position where the carriage 30 is perpendicular to the moving direction of the carriage 30).

As described above, by detecting the inclination Δ of the tracking mark and correcting this inclination Δ using angle adjustment control, it is possible to match the scanning line during decrypted copying with the scanning line during encrypted copying. , it is now possible to obtain good reproduced images with little deviation. Furthermore, in the decrypted copying of this embodiment, as described above, the scanner unit 101
Detects the reference position detection mark written on the document based on the image signal output by the camera, and processes the received image signal by dividing it into blocks based on the detection results, resulting in better playback with fewer deviations. An image can be obtained (15).

In addition, the angle side! ! Since the control is specific to decoding and copying, when the control of the copying operation of the trichloride copying is completed, the system control unit 104 controls the motor control circuit 11.
2 to move the angle adjustment stage 37 to the standard position.

In this embodiment, the angle of the entire carriage with respect to the document was adjusted at t, but in the present invention, the relative angle between the scanning direction in the main scanning direction and the document placed at a when reading the document is changed. Preferably 1 For example, use only CCD for the original, C
You can change the angle of the CD and lens array, or fix the CCD and rotate the document itself to adjust the angle by 3.
ff may be adjusted.

Referring again to FIG. 8, the system control unit 1-1
04 then controls the copy operation (
16), and when this is finished, display messages as necessary (17), and display the standard screen again (2).
).

The embodiment described above is a case where blocks divided in the main scanning direction are rearranged, but the present invention is similar to the embodiment described above.

It can also be applied when rearranging blocks divided in the main-scanning direction and the sub-scanning direction, or when changing the rearrangement order of blocks on a line-by-line basis or on a plurality of line-by-line basis.

〔Effect of the invention〕

As described above, according to the first aspect of the present invention, only the area defined by the reference position mark of the original (encrypted image) is decrypted, that is, only the encrypted image portion is automatically and accurately extracted. Since only this part is decrypted, 1
Even if the document is slightly shifted from the reference position of the image reading device, the reconstruction process is not applied to the margin area (outside the specified area of the base or position mark) that includes the shift. In other words, the image (pixel) position change in the decoding order does not affect the blank space. As a result, the decrypted image signal faithfully represents the encrypted portion of the original image. As a result, positioning of the document (encrypted image) on the image reading device during decryption recording can be made easy and simple, and the reproducibility of the restored recorded image is high.

According to the second aspect of the present invention, the restored image (copy of the original document) is recorded on the encrypted recording paper and in which the reference position mark for alignment, which is necessary only when the encrypted recorded image is restored and recorded, is erased. High fidelity of reproduced and restored images.

According to the third aspect of the present invention, an image signal is obtained in which the misalignment of the original (encrypted image) with respect to the reference position of the image reading means (101) is automatically corrected, and the image signal is subjected to decoding processing. Therefore, on the recording medium.

Decoded image a with no shift despite the misalignment of the original
(image of the original manuscript) is reproduced and recorded.

A faithful image of the original document is restored and recorded in the same way as when the document is not misaligned.

According to the fourth aspect of the present invention, even if the reference position mark is only at the top, bottom, left, or right end of the document, the encrypted image recording area is automatically defined based on the reference position mark and the size of the document. Therefore, the process of determining the encrypted recording area is easy and simple, and the reproducibility of the restored recorded image is high. In addition,
The restoration recording size can be appropriately selected in accordance with the size of the encrypted recording area so as to perform recording without recording omissions (image cutoffs).

According to the fifth aspect of the present invention, the misalignment of the original (encrypted image) with respect to the reference position of the image reading means (101) is automatically corrected, and the decryption process is performed on it. A faithful original image is restored and recorded without positional deviation.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an outline of the structure of a mechanical part of a digital copying machine incorporating an embodiment of the present invention. FIG. 2 is a block diagram showing a general configuration of the electrical equipment section of the copying machine shown in FIG. 1. FIG. 3 is a plan view of the operation display section 106 shown in FIG. 2. Fig. 4a is a plan view showing the original document being encrypted and recorded by the copying machine shown in Fig. 1, Fig. 4b is a plan view showing the encrypted recording paper, and Fig. 4C is a plan view showing the image of the original document being reproduced and recorded. FIG. FIG. 5 is a block diagram showing the configuration of the encryption/decryption circuit 124 shown in FIG. 2. FIG. 6 shows line buffer circuit 125, mark detection circuit 126 . 2 is a block diagram showing the configurations of an address management circuit 127 and a mark adding circuit 128. FIG. FIG. 7 is a block diagram showing the configuration of the LUT circuit 222 shown in FIG. 6. 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 display screens of the touch panel display 166 on the operation display section 106 shown in FIG. 3. FIG. FIG. 10 shows the system control unit 104 shown in FIG.
FIG. 2 is a block diagram showing the process of creating an address translation table created in FIG. FIG. 11 is a plan view showing an example of an address conversion table obtained by the creation process shown in FIG. 10. FIG. 12 is a plan view showing the relationship between the document 1 placed on the platen 2 shown in FIG. 1 and the mark positions stored by the system control unit 104 shown in FIG. 2. FIG. 13 is a graph showing the relationship between the length of the document 1 in the main scanning direction and the standard value ΔTH of the inclination Δ of the tracking mark shown in FIG. FIG. 14 shows 'JI!' of the mechanism section of the scanner unit 101 shown in FIG. It is a perspective view which shows tII8. 1: Original 2 Nibraten 3: Fluorescent lamp 4: Lens array s: ccD 6: Polygon mirror 7: fθ lens 8: Mirror 9
: Photosensitive drum 1O: Polygon motor 11: Charging charger 12: Developing unit 13: Transfer charger 14: Separation charger 15: Cleaning unit 16 Two cassettes 17: Recording paper 18, 19
:#i paper roller 20=registration roller 21:
Fixing unit 22 Nidorei 23:
Carriage drive motor 24: Original pressure plate
Addition: Carriage 31: CCD reading plate 3
2.35.36: Pulley 33.34: Drive wire
37: Angle adjustment stage 38 Bi-angle reference sensor 101: Scanner unit (image reading means) 102:
Image processing unit 103: Printer unit (image recording means) 104 System control unit α (increase determination means) 105: Synchronous control section

Claims (5)

[Claims] (1) Image reading means that scans a document in the main scanning direction and sub-scanning direction and sequentially outputs image signals for each read pixel, and receives and decodes the image signals output by the image reading means in a different order from the received order. a decoding processing means for outputting image signals in sequence; an image recording means for recording an image represented by the image signal outputted by the decoding processing means on a recording medium;
An encrypted image restoration/recording device comprising: a mark detection means for detecting a reference position mark on a document from an image signal outputted by the image reading means; and a mark detection means for performing decoding processing by the decoding processing means. 1. An encrypted image restoration/recording device, comprising: decryption area restriction means for restricting decoding to an area defined by a detected reference position mark. (2) further comprising mark image erasing means for erasing the image signal of the reference position mark from the image signal output by the image reading means in response to the reference position mark detection signal generated by the mark detection means; Claim No. 1
) The encrypted image restoration/recording device described in item 2. (3) Image reading means that scans the original in the main scanning direction and sub-scanning direction and sequentially outputs image signals for each read pixel, and receives and decodes the image signals output by the image reading means in a different order from the received order. a decoding processing means for outputting image signals in sequence; an image recording means for recording an image represented by the image signal outputted by the decoding processing means on a recording medium;
An encrypted image restoration and recording device comprising: mark detection means for detecting a reference position mark on a document from an image signal output by the image reading means; and image reading of the reference position mark detected by the mark detection means. a relationship in which the reference position mark is at a predetermined position with respect to the reference line in response to a deviation of the reading area of the means with respect to the reference line;
An encrypted image restoration/recording device, comprising read image position correction means for correcting the position of an image signal output by the image reading means. (4) Image reading means that scans the original in the main scanning direction and sub-scanning direction and sequentially outputs image signals for each read pixel, and receives and decodes the image signals output by the image reading means in a different order from the received order. a decoding processing means for outputting image signals in sequence; an image recording means for recording an image represented by the image signal outputted by the decoding processing means on a recording medium;
An encrypted image restoration/recording device comprising: a mark detection means for detecting a reference position mark on a document from an image signal outputted by the image reading means; and a mark detection means for performing decoding processing by the decoding processing means. 1. An encrypted image restoration/recording device, comprising: decryption area restriction means for restricting decryption area to an area defined by a detected reference position mark and the size of a document. (5) Image reading means that scans the original in the main scanning direction and sub-scanning direction and sequentially outputs image signals for each read pixel, and receives and decodes the image signals output by the image reading means in a different order from the received order. a decoding processing means for outputting image signals in sequence; an image recording means for recording an image represented by the image signal outputted by the decoding processing means on a recording medium;
An encrypted image restoration and recording device comprising: mark detection means for detecting a reference position mark on a document from an image signal output by the image reading means; and image reading of the reference position mark detected by the mark detection means. Angle adjusting means for 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 angular difference between the reading area of the means and the reference line; An encrypted image restoration recording device, comprising: