JPS63241662A - Picture input device - Google Patents

Abstract

PURPOSE:To attain the holding of the secrecy of a document at the time of transmitting and preserving the document by enciphering a picture signal in accordance with a cipher key registered individually and decoding the enciphered picture signal in accordance with an above-mentioned cipher key. CONSTITUTION:The picture signal obtained by moving a copied message 10 at right angles to the scanning direction of a one-dimensional photoelectric converter 14 is digitized by a digitizing circuit 7. Based on a signal inputted from a selecting key 140 to a control part 100, enciphering by an enciphering part 19 and decoding by a decoding part 18 are executed to the digitized picture signal. Then, the key for the enciphering and decoding is generated by the control part 100 based on the code inputted from a code input part 110 and based on the key, the enciphering and decoding are executed. Consequently, since the code key can be changed, the enciphered picture signal is not restored to its original image easily by a third party.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] 1-1 The present invention relates to an image input device, and is particularly suitable for filing, copying, and transmitting confidential documents.

The present invention relates to an image input device.

[Prior art] A conventional image input device is the Nikkei Electronics 1984
Published on pages 161 to 194 of the September 10 issue.

In order to convert changes in the contrast of a copy into electrical signals, a light source 12 is used to illuminate the copy 10, which has the configuration shown in FIG. 5 is imaged onto a transducer 14. The photoelectric converter 14 converts the signal into an electric signal, the amplifier 15 amplifies the signal, the shading correction circuit 16 removes the effects of lighting, lenses, etc., and then the digitization circuit 17 performs digital processing such as binarization. Alms,.

Now output via interface 250 73
, was. However, it is not suitable for sensitive subjects.

No consideration was given to prevent leakage. sand.

That is, the image signal output from the interface 230.

Re-create the original image by playing the issue as is.

-1
I can do it. Also, image signals can be stored in memory or externally.

Data compression is usually performed for transmission to the section.

The data structure may be different from the original image. child.

Even in such a case, since the compression method is unique to the device, the original data structure, that is, the original image, can be easily reproduced.

[Problem that the invention seeks to solve]

As mentioned above, the conventional technology does not give any consideration to the leakage of confidential documents, and it is possible to easily reproduce the original image from the image signal. There was a problem with confidentiality when saving the image to a different image file.

An object of the present invention is to solve the above problems.

[Means for solving problems]

The above purpose is an encryption key in which image signals are individually registered.

This is achieved by encrypting the image signal according to the encryption key and decrypting the encrypted image signal according to the encryption key.

[Effect] The encryption and decryption sections use externally supplied passwords.

A signal for encryption or decryption is generated according to the encryption key, and the image signal is encrypted and decrypted. Dark.

Since the code key can be changed by changing the pin code set arbitrarily from an external keyboard, the encrypted image signal cannot be easily restored to the original image and confidentiality is maintained. It is maintained. - [Example] An example of the present invention will be described below with reference to FIG. 1, which shows changes in contrast on the surface of the copying material 10.

A light source for converting into electrical signals 12. Lens 13. −・
Dimensional photoelectric converter 14. Sending for moving the subject 10.

mechanism 11, and an amplifier 15 for amplifying and shaping electrical signals. Shading correction section 16, digitized.

A circuit 17 and an encryption unit 19 for secrecy. Decoding unit 1
．． .

18.Password input section B01 selection key 140. Selection section 150
and a control section 100 that performs overall control.

ing. The operation in such a configuration will be explained below.

Ru. The copy 10 is illuminated by a light source 12. Con.

The change in trust is achieved by one-dimensional photoelectric conversion using the imaging lens 13, -
.

An image is formed on the device 14 and converted into an electrical signal. copy.

The body 10 is moved by a one-dimensional photoelectric converter 14 by a feeding mechanism 11.

It moves perpendicular to the front direction and electrographs the entire surface of the copy 10.

Convert to number. The output of the -dimensional photoelectric converter 14 is transmitted to the amplifier 1
Amplified by 5 and copied by lens 13 and light source 12 -1
・3. The shading correction unit 16° corrects the peripheral dimming of the body 10. The shading-corrected image signal is applied to a digitizing circuit 17 and digitized.

After performing processing such as binarization and data compression as necessary, the data is added to the encryption section 19 and the decryption section 18. Encryption or decryption is determined by a signal input from the selection key 140 to the encryption unit 100, and the control unit 100 determines the encryption unit 19.
．． Either one of the decoding sections 18 operates. The key for encryption and decryption is a PIN witness.

1 to the pin code input from the blade part 110 to the control part 100.
．． .

Based on this, the control unit 100 generates the data and decrypts it with the encryption unit 19.

are given to the converting section 18, respectively. Encryption unit 19. Decoding part.

18 encrypts or encrypts the image signal as described later.

The decoding process is performed and selection is made under the control of the control unit 100.

4. Regarding 1° encryption and decryption, one of which is output to terminal A via section 130. Using Figure 5.

After the explanation, an embodiment of the encryption section and the decryption section will be explained.

This will be explained using Figure 6.

Figure 4 shows the original pattern. In order to encrypt a pattern like that shown in Figure 4 and make it unreadable, we will explain it by taking as an example a case where, for example, a signal that alternately repeats black and white and an exclusive OR are taken for each pixel. . Assuming that the signal obtained by horizontally scanning the pattern in FIG. 4 is 1 for black and 0 for white, the first line is 10000010001001. First, if the encryption signal is a signal that alternately repeats 1 and 0.

Exclusive OR with in is 00101011101110
It becomes Q. The subsequent encrypted patterns become as shown in FIG. 5 and cannot be read as they are. Cipher.

By changing the signal of the change, the turn of FIG.

Since the pattern will be different, the encryption signal will be used as a password.

Confidentiality can be increased by changing the code.

Ru.

Decryption is the signal used for encryption, as shown in Figure 5.

l− by taking the exclusive OR with pixel by pixel.

If you do this, you will be able to reproduce the pattern shown in Figure 4. .

FIG. 6 shows an embodiment of the encryption section 19 and the decryption section 18.

be. It has encryption and decryption functions. below.

Its configuration and operation will be explained.

FIG. 6 shows image signals during encryption and decryption.

The code and the encrypted signal are exclusive-ORed for each pixel.
2. An address counter 63 for specifying the address of the memory 62, a read-only memory 64 for generating an encryption key from a password code, a shift register 65 for converting the encryption key into a temporary serial signal, and a cipher.

Exclusive OR circuit 66 for converting and controlling these.

It consists of a control section 60.

Before inputting the PIN code, the control unit 60 inputs the address key 6.
5 is cleared by the signal from terminal CL. When a password is input from the password input section 61, data is applied to the terminal DI of the memory 62.degree., a write signal is applied to the terminal W, and the password is written to the memory address 20. Control unit 60
is the signal from the password input section 61.

Enter from child N and check the number of pin codes.

When the number of digits is less than the predetermined number, the address counter 66° is incremented by 1 by a signal from the terminal CK. Similarly below.

Assume that all the password codes are inputted as shown in FIG. 7, for example. In other words, the number is 0 in a 4-digit pin code.
482. Further, assume that the contents of the read-only memory 64 for generating the encryption key are as shown in FIG. 8, for example.

Assume that the image signal is encrypted using, for example, 32 pixels as one line. Memory 62 address color data 6
Clear 5 and start encryption. The output of the memory 625 is connected to the address terminal A2 of the read-only memory 64, and the output DO of the read-only memory 64 is connected to the parallel input terminal PDIC of the shift register 65.

ing. The address is set by the control unit 60 prior to encryption.

When the counter 63 is cleared, the address of the memory 62,
.

The PIN code 0 stored in 0 is read out.

Points to address 0 of read-only memory 64. reading.

lQ101010 to the output terminal VO of the output-only memory 64
Since the encryption key .degree. is outputted, it is input into the shift register 65 in parallel at 1.degree. with a signal from the terminal LD of the control section 60.degree. The image signal is connected to one terminal S of the exclusive OR circuit 66, and the serial output terminal SO of the shift register 65 is connected to the other terminal of the exclusive OR circuit 66, and the control unit 60 is connected in synchronization with the image signal. A clock signal is applied to the shift register 65 from the terminal CKS. ,.

・ 7 ・ When the shift register 65 that outputs the encryption key in a chronological order from the terminal SO receives 8 bits, the address power r'7y・ri 63 is +1 and the encryption key oto1ot corresponding to the primary password code 4 is sent. 1 is input to the shift register 65 in parallel. In the same manner, when all the PIN codes are encrypted, the address counter 63° is cleared by the control unit 60, and the encryption is repeated starting from the first value of the PIN code, that is, 0 in FIG. It is done. In the above example, it is a PIN code.

is 4 digits and the encryption key is 8 bits, but it is clear that it is not 11 in this case, and the encryption key is also stored.

Although the memory is read-only, it may also be writable so that the encryption key can be changed arbitrarily.

Decryption can be performed in the same manner as encryption. However, an already encrypted image signal is input to the terminal S of the exclusive OR circuit 66, and the same password code and encryption key as those used for encryption are used.

Figure 6 uses exclusive OR for encryption and decryption, so the same circuit may be used, but other methods may also be used. Further, after encryption, the data may be compressed by known means.

FIG. 3 shows another embodiment of the present invention, which is a device capable of storing and reproducing confidential documents by outputting encrypted, decoded, and quantified image signals to paper, optical discs, and the like.

Figure 3 shows a selection section 3 that selects an encrypted or decrypted signal.
3,54. To output the above signal to the paper 57.

laser beam printer 35 and the above signal, 1
゜Optical disk writing for output to optical disk 591.

reading circuit 361, optical disk drive circuit 381, and encryption.

The signal from the optical disc on which the received signal is recorded.

The optical disc readout circuit 362 for reproduction is provided.

In addition, the signal from the optical disk 392 or the photoelectric converter + 4
．． .

A selection unit 51j2. selects one of the signals from 51j2. It consists of an input selection key 301 for inputting a selection signal and the parts shown in FIG.

In FIG. 3, the image of the subject 10 is encrypted and the encrypted document is output to the laser beam printer 35.

This will be explained using an example.

The object 10 is the same size as the paper 37 and the photoelectric converter 14.
and the resolution of the laser beam printer are the same. - Select the signal from the photoelectric converter using the input selection key 301.

When encryption is selected using the selection key 140, the control unit 53
00 is the input terminal A1 side of the selection section 31 and the selection section 630 input.

Select terminal A2 side. Light by the method mentioned earlier.

The image signal of the electric converter 14 is encrypted by the encrypting section 19 and then sent to the selecting section 33 to be laser beam printed.

Error added to 35. Laser beam printer running.

The scanning signal is sent from the control section 300 to the photoelectric converter 14.

It is assumed that the signal is emitted in synchronization with the mechanism 11. Revenge.

Discrepancy between the encryption key and the encrypted image during quantification.

In order to prevent this, the edge of the subject 10 is encrypted.

Both ends are detected by a known edge detection means (not shown) and encrypted using the signal from the detection means.

, and decrypt using the same method.

Start. In addition to this, there are synchronization marks on the subject, for example.

For example, a black straight line may be drawn, a key that always starts with 0 may be used as the encryption key, and a synchronization mark may also be included in the encrypted image.

It is clear that recording the encrypted result from the photoelectric converter 14 to the optical disc 391 or decoding and outputting the encrypted contents of the optical disc 392 to the paper 37 can be accomplished in the same manner as described above. b [Effect of the Invention] According to the present invention, an image signal in which the original image is difficult to decipher.

Since it is converted into a code and output, it has a significant effect on the transmission and storage of confidential documents.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention. Fig. 2 is a block diagram showing the conventional example, and Fig. 3 is the present invention. FIG. 4 is a block diagram showing another embodiment of the present invention. 5 is an explanatory diagram of encryption, FIG. 6 is a block diagram showing detailed examples of encryption, decryption, and circuits, and FIG. −. FIG. 8 is a display diagram showing a data structure for explaining encryption. 10: Subject, 11: Feeding mechanism, 12: Light source, 13: Lens, 14: Photoelectric converter, 15: Amplifier, 16: Shading correction unit, 17: Digitization circuit, 18: Return,
. , 11. Ossification circuit, 19: Encryption circuit, 100: Control unit, 110
・: Password input section, 140: Selection key. 12. Figure 7 → Dieg Figure 8

Claims (1)

[Claims] 1. An image input device equipped with a means for converting the contrast strength of a subject into an electrical signal, which includes a means for inputting a password code, a means for generating an encryption key according to the password code, and a means for generating an input image using the encryption key. An image input device comprising: means for encrypting or decoding, means for selecting a function of the encryption or decoding, and means for selectively outputting a result processed by the selecting means.