CN1183739C - Digital image coding/decoding device and method for recording and recovering signature image - Google Patents
Digital image coding/decoding device and method for recording and recovering signature image Download PDFInfo
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- CN1183739C CN1183739C CNB991089316A CN99108931A CN1183739C CN 1183739 C CN1183739 C CN 1183739C CN B991089316 A CNB991089316 A CN B991089316A CN 99108931 A CN99108931 A CN 99108931A CN 1183739 C CN1183739 C CN 1183739C
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T1/00—General purpose image data processing
- G06T1/0021—Image watermarking
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2201/00—General purpose image data processing
- G06T2201/005—Image watermarking
- G06T2201/0052—Embedding of the watermark in the frequency domain
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Abstract
Digital image encoding/decoding apparatus and methods for recording a signature image using watermarking, and for restoring the recorded signature image are provided. The apparatus includes a first discrete wavelet transform portion for receiving a host image and performing discrete wavelet transform thereon, a second discrete wavelet transform portion for receiving a signature image and performing discrete wavelet transform thereon, a pseudo-random number generator for receiving an encryption code and generating the pseudo-random numbers, and a coefficient replacement portion for selecting the replacing locations of NxN pixels using the pseudo-random numbers, and replacing the coefficients of the selected NxN pixel locations among MxM discrete wavelet coefficients with NxN wavelet coefficients. Since transmission is made such that a portion of signature image coefficients is superimposed on that of host image coefficients. Thus, addition of signature image coefficients does not increase the amount of transmitted data.
Description
Technical field
The present invention relates to digital image coding device and decoding device, and relate in particular to the decoding device that is used to use the digital image coding device of watermark record signature image and is used for the signature image of recovery record.And the present invention relates to be used to use the digit image coding/decoding apparatus of watermark record and recovery signature image.In addition, the present invention relates to be used to use the digital picture coding method and the coding/decoding method that is used for the signature image of recovery record of watermark record signature image.
Background technology
Watermark is a kind of like this technology, and the original image of the signature image that wherein having maintains secrecy embeds is that master image is sent out at delivery time, and master image is visible when receiving, and signature image is sightless.Discern described signature image by special decryption device.Described digital watermark is used to provide safety and proof power.
Fig. 1 is the block diagram that is used to use the watermark record and recovers the conventional digital image coding and decoding apparatus of signature image.With reference to Fig. 1, will the operation of conventional digital image coding and decoding apparatus be described.At first, during encoding, the signature image that sends of will maintaining secrecy in master image and the embedding master image is carried out DCT (discrete cosine transform), extract the DCT coefficient of each image thus.By encoder to the DCT coefficient coding.At this, by being used to carry out the DCT coefficient component coding of the scrambled device of the separation of encrypting control operation to signature image.In this way, can send the master image DCT coefficient behind the coding and embed the signature image DCT coefficient of master image DCT coefficient.Master image DCT coefficient and the signature image DCT coefficient that embeds master image DCT coefficient are carried out IDCT (inverse discrete cosine transform), obtain wherein the visible and image that adds watermark that do not have signature image to show of master image only thus.
At the special decryption device that is used for recovering on master image, adding the signature image of watermark, the image that is added watermark by IDCT is carried out DCT, extract the DCT coefficient that adds watermarking images thus.Then, from the DCT coefficient of the image that adds watermark, separate, extract the DCT coefficient component of the encryption of signature image thus by original master image being carried out the DCT coefficient that is extracted that adds watermarking images that IDCT obtains.Then, decoder is to the DCT coefficient component decoding of the encryption of signature image.At this, encrypt decoder and carry out the deciphering control operation.Signature image DCT coefficient by deciphering control operation decoding is carried out IDCT once more, recovers signature image thus.
As mentioned above,, must provide the original master image identical, so that recover signature image with being used in transmitter side at the conventional digital image coding and decoding apparatus that is used for using traditional watermark Code And Decode signature image.In addition, send with master image DCT coefficient, increase corresponding to the transmission data volume of the quantity of signature image owing to insert the signature image DCT coefficient of master image DCT coefficient.
Summary of the invention
First purpose of the present invention provides a kind of digital image coding device, and this device can send signature image and not increase the data volume that will send.
Second purpose of the present invention provides a kind of digital image decoding device, and this device can be from not needing original master image by recovering signature image the digital image coding device coded data.
The 3rd purpose of the present invention provides a kind of digit image coding/decoding apparatus, and this device can send signature image, and does not increase the data volume that will send, and can recover signature image and do not need original master image.
The 4th purpose of the present invention provides the digital picture coding method of being realized by digital image coding device.
The digital image decoding method that is realized by the digital image decoding device is provided during the 5th purpose of the present invention.
In order to realize first purpose of the present invention, providing a kind of is used to use watermark to write down the digital image coding device of signature image on master image, this device comprises: the first wavelet transform part, be used to receive master image and it is carried out wavelet transform, export M * M discrete wavelet coefficient thus, wherein M is a predetermined positive; The second wavelet transform part is used to receive signature image and it is carried out wavelet transform, exports N * N discrete wavelet coefficient thus, and wherein N is the predetermined positive less than M; Pseudorandom number generator is used to receive the encrypted code of the definite pre-defined rule that is used to produce pseudo random number, and produces pseudo random number according to the pre-defined rule corresponding to encrypted code; Coefficient is replaced part, is used to use pseudo random number to select the replacement position of N * N pixel, and replaces the coefficient of the replacement position of N * N pixel of selecting in M * M discrete wavelet coefficient with N * N discrete wavelet coefficient, thus M * M the wavelet coefficient of output replacement.
In order to realize second purpose of the present invention, providing a kind of is used to use watermark to write down the digital picture coding method of signature image on master image, this method may further comprise the steps: receive master image and it is carried out wavelet transform, export M * M discrete wavelet coefficient thus, wherein M is a predetermined positive; Receive signature image and it is carried out wavelet transform, export N * N discrete wavelet coefficient thus, wherein N is the predetermined positive less than M; Reception is used to produce the encrypted code of definite pre-defined rule of pseudo random number, and produces pseudo random number according to the pre-defined rule corresponding to encrypted code; Use pseudo random number to select the replacement position of N * N pixel, and replace the coefficient of the replacement position of selected N * N pixel in M * M discrete wavelet coefficient, thus M * M the wavelet coefficient of output replacement with N * N discrete wavelet coefficient.
For realizing the 3rd purpose of the present invention, a kind of digital image decoding device that is used to recover to use the signature image that watermark embeds on master image is provided, this device comprises: pseudorandom number generator is used to receive encrypted code, and produces pseudo random number according to the pre-defined rule corresponding to encrypted code; The coefficient separating part is used to use pseudo random number to set the separation point position of N * N pixel, and separates in M * M wavelet coefficient the wavelet coefficient corresponding to N * N pixel separation position, thus N * N wavelet coefficient of separating of output; The inverse discrete wavelet transform part is used to use N * N wavelet coefficient of separation to carry out inverse discrete wavelet transform, thus the signature image of output recovery.
For realizing the 4th purpose of the present invention, provide a kind of being used to recover to use watermark on master image, to embed the digital image decoding method of signature image, this method may further comprise the steps: receive the encrypted code image, and produce pseudo random number according to the pre-defined rule corresponding to encrypted code; Use pseudo random number to set the separation point position of N * N pixel; Corresponding to the wavelet coefficient of N * N pixel separation position, export the N * N wavelet coefficient that separates thus in separation M * M wavelet coefficient; Use the N * N wavelet coefficient that separates to carry out inverse discrete wavelet transform, thus the signature image of output recovery.
For realizing the 5th purpose of the present invention, a kind of digit image coding/decoding apparatus is provided, be used to use watermark on master image, to write down signature image, from have the image that adds watermark that has embedded signature image, recover signature image, this device comprises: the first wavelet transform part, be used to receive master image and it is carried out wavelet transform, export M * M discrete wavelet coefficient thus, wherein M is a predetermined positive; The second wavelet transform part is used to receive signature image and it is carried out wavelet transform, exports N * N discrete wavelet coefficient thus, and wherein N is the predetermined positive less than M; First pseudorandom number generator is used to receive the encrypted code of the definite pre-defined rule that is used to produce pseudo random number, and produces pseudo random number according to the pre-defined rule corresponding to encrypted code; Coefficient is replaced part, be used to use pseudo random number to select the replacement position of N * N pixel, and replace the coefficient of the replacement position of N * N pixel of selecting in M * M discrete wavelet coefficient with N * N discrete wavelet coefficient, export M * M wavelet coefficient second pseudorandom number generator of replacing thus, be used to receive encrypted code, and produce according to pseudo random number corresponding to the pre-defined rule of encrypted code; The coefficient separating part, be used to use pseudo random number to set the separation point position of N * N pixel, and the wavelet coefficient corresponding to N * N pixel separation position in the M * M wavelet coefficient of separation mixing master image is used for vision-mix, exports the N * N wavelet coefficient of signature image thus; The inverse discrete wavelet transform part is used to use N * N wavelet coefficient of separation to carry out inverse discrete wavelet transform, thus the signature image of output recovery.
Description of drawings
Describe the preferred embodiments of the present invention in detail by the reference accompanying drawing, it is more obvious that above-mentioned purpose of the present invention and advantage will become, wherein:
Fig. 1 is to use the block diagram that is used to write down and recover the conventional digital image coding and decoding apparatus of signature image of traditional watermark;
Fig. 2 is the block diagram according to digital image coding device of the present invention and digital image decoding device;
Fig. 3 is the flow chart according to the step of digital picture coding method of the present invention; With
Fig. 4 is the flow chart according to the step of digital image decoding method of the present invention.
Embodiment
Fig. 2 is the block diagram according to digital image coding device of the present invention and digital image decoding device.
With reference to Fig. 2, digital image coding device 20 comprises: the first wavelet transform part 202; The second wavelet transform part 204; Pseudorandom number generator 206; Coefficient is replaced part 208; Contrary M * M wavelet transform part 210 and compression section 212.
In the operation of digital image coding device 20, the first wavelet transform part 202 receives master image and it is carried out the wavelet transform part.As a result, the first wavelet transform part 202 produces M * M discrete wavelet coefficient, and M is a predetermined positive.
The second wavelet transform part 204 receives signature image and it is carried out wavelet transform.Understood as prior art personnel in the watermark correlation technique, the size of signature image is less than the master image size.So the matrix size of the wavelet coefficient of signature image is less than the matrix size of the wavelet coefficient of master image.For example, the matrix size N of the wavelet coefficient of signature image is preferably less than the matrix size M of the wavelet coefficient of master image, i.e. N＜0.5M.Therefore, the second wavelet transform part, 204 output N * N discrete wavelet coefficients suppose that N is the predetermined positive less than M.
Coefficient is replaced part 208 and is used pseudo random numbers to select the replacement position of N * N pixels, and replaces the coefficient of selected N * N pixel location in M * M discrete wavelet coefficient, the M * M wavelet coefficient of output replacement thus with N * N wavelet coefficient.
Inverse discrete wavelet transform part 210 uses M * M wavelet coefficient of replacing to carry out inverse discrete wavelet transform, produces the master image of mixing with signature image thus.At this because signature image is distributed in the whole master image in the master image of mixing, and in view of the characteristic of wavelet transformation only master image be recognizable, can reach a conclusion, on master image, added the watermark success.
In order to send the master image that adds watermark, consider limited channel characteristic, need to carry out compression.So compression section 212 is carried out compression for the master image that adds watermark, exports bit stream thus.In this embodiment, compression section 212 also compresses the encrypted code that is used by pseudorandom number generator 206, so that determine the condition of the pseudo random number of generation.In addition, in the present embodiment, compression section 212 is carried out compression based on DCT.If the image that adds watermark that signature image is distributed in the whole master image is carried out DCT, has just given prominence to master image.Yet because signature image is distributed in the whole master image, it does not have shape and time to go up discontinuous.In addition, meticulous signature image component is further decayed.The master image that these characteristics allow to obtain by the mixing master image of recovering compression is used former state in the decode procedure of describing in the back.
Through above-mentioned cataloged procedure, by send the bit stream that can send master image and be compressed in encrypted code wherein through sendaisle with mixing.In order to send described bit stream through sendaisle, need the processing that separates.Yet,, do not illustrate in the present embodiment to carry out and send the processor that bit stream is handled because a variety of processing that are used to send bit stream are arranged.
With reference to Fig. 2, comprise according to digital image decoding device 220 of the present invention: decompression part 222; Wavelet transform part 224; Pseudorandom number generator 226; Coefficient separating part 228 and inverse discrete wavelet transform part 230.
Now, will the operation of digital image decoding device 220 be described.At first, decompression part 222 receives has the bit stream that mixes master image and be compressed in encrypted code wherein, and it is decompressed, and recovers encrypted code and master image thus.
The master image of 224 pairs of recoveries of wavelet transform part is carried out wavelet transform, exports M * M wavelet coefficient then.
Inverse discrete wavelet transform part 230 uses the N * N wavelet coefficient that separates to carry out inverse discrete wavelet transform, thus the signature image of output recovery.
In according to above-mentioned digital image coding device of the present invention, a part of signature image coefficient is superimposed upon on the master image coefficient and sends.Like this, the adding of signature image coefficient does not increase the transmission data volume.In addition, the digital image decoding device does not need and the identical original master image of using at transmitter side, so that recover signature image.
A single codec device need be passed through by situation, above-mentioned Code And Decode device can be realized.
Fig. 3 is the key step flow chart according to digital picture coding method of the present invention.With reference to Fig. 3, receive master image and it is carried out wavelet transform, export M * M discrete wavelet transform coefficients (M is a predetermined positive) thus.In addition, receive signature image, and it is carried out wavelet transform, export N * N discrete wavelet transform coefficients (N is the predetermined positive less than M) (step 302) thus.
Then, in M * M master image wavelet coefficient, select the position (step 304) of any N * N pixel according to pre-defined rule.Step 304 can comprise following substep: receive the encrypted code of the definite pre-defined rule be used to produce pseudo random number, produce pseudo random number according to the pre-defined rule corresponding to encrypted code then; Use pseudo random number to select the replacement position of N * N pixel, export the position data of the replacement of N * N pixel thus.
Then, receive and replace position data, and replace the coefficient (step 306) of N * N pixel location with N * N signature image wavelet coefficient.The M that then, can obtain to replace * M master image wavelet coefficient.
Then, use M * M master image wavelet coefficient of replacing to carry out inverse discrete wavelet transform (step 308).Then, produce the master image of mixing.
Then, mix master image and encrypted code compression (step 310).Need according to situation, packed data can send by communication port.
Fig. 4 is the flow chart of steps according to digital image decoding method of the present invention.With reference to Fig. 4, the bit stream with compress-encrypt sign indicating number and master image is received and decompresses, and recovers encrypted code and master image (step 402) thus.
Then, the master image of recovering is carried out wavelet transform (step 404), obtain M * M master image wavelet coefficient (step 406) thus.
The coefficient of the N * N pixel location in M * M master image wavelet coefficient is set to signature image wavelet coefficient (step 408) according to pre-defined rule.Step 408 can comprise following substep: according to the pre-defined rule corresponding to the encrypted code that obtains in step 402, produce pseudo random number, use pseudo random number to set the separation point position of N * N pixel, export the separation point position data of N * N pixel thus, separate in the M * M wavelet coefficient of the image wavelet coefficient that adds watermark, as the signature image coefficient, obtain N * N wavelet coefficient corresponding to the wavelet coefficient of N * N pixel separation position data thus, be set at the signature image wavelet coefficient then.
Then, use the N * N wavelet coefficient that separates to carry out inverse discrete wavelet transform, obtain the signature image (step 410) that recovers thus.
Digital image coding by being shown in Fig. 1 and decoding device can be distinguished and easily realize digital image coding and coding/decoding method.In addition, can write out with computer program according to digital image coding of the present invention and coding/decoding method.In addition, they can realize by general purpose digital computer, and this computer is used for moving the program that adopts the medium that computer uses.This medium comprises that magnetic recording media such as floppy disk or hard disk, optical recording media such as CD-ROM or DVD, broadcast medium are such as the internet.In addition, these function programs, code, code segment can be inferred easily by the programmer in the field related to the present invention.
As mentioned above, in according to digital image coding device of the present invention, a part of signature image coefficient is superimposed upon on the master image coefficient and sends.Like this, the adding of signature image coefficient does not increase the transmission data volume.In addition, in according to digital image decoding device of the present invention, can recover signature image, and not use and the identical original master image of using at transmitter side.
Claims (14)
1, a kind of digital image coding device is used to utilize watermark to write down signature image on master image, and this digital image coding device comprises:
The first wavelet transform part is used to receive master image and it is carried out wavelet transform, exports M * M discrete wavelet coefficient thus, and wherein M is a predetermined positive;
The second wavelet transform part is used to receive signature image and it is carried out wavelet transform, exports N * N discrete wavelet coefficient thus, and wherein N is the predetermined positive less than M;
Pseudorandom number generator is used to receive the encrypted code of the definite pre-defined rule that is used to produce pseudo random number, and produces pseudo random number according to the pre-defined rule corresponding to described encrypted code;
Coefficient is replaced part, be used to use described pseudo random number to select the replacement position of N * N pixel, and replace the coefficient of the replacement position of N * N pixel of selecting described in M * M discrete wavelet coefficient with N * N discrete wavelet coefficient, thus M * M the wavelet coefficient of output replacement.
2, digital image coding device as claimed in claim 1 also comprises the inverse discrete wavelet transform part, is used to use the M * M wavelet coefficient of described replacement to carry out inverse discrete wavelet transform, to produce the master image of mixing.
3, digital image coding device as claimed in claim 2 also comprises compression section, is used to receive encrypted code and with encrypted code and the master image compression that mixes.
4, a kind of digital picture coding method is used to utilize watermark to write down signature image on master image, may further comprise the steps:
Receive master image and it is carried out wavelet transform, export M * M discrete wavelet coefficient thus, wherein M is a predetermined positive;
Receive signature image and it is carried out wavelet transform, export N * N discrete wavelet coefficient thus, wherein N is the predetermined positive less than M;
Reception is used to produce the encrypted code of definite pre-defined rule of pseudo random number, and produces pseudo random number according to the pre-defined rule corresponding to described encrypted code;
Use described pseudo random number to select the replacement position of N * N pixel; With
Replace the coefficient of the replacement position of N * N pixel of selecting described in M * M discrete wavelet coefficient with N * N discrete wavelet coefficient, thus M * M the wavelet coefficient of output replacement.
5, digital picture coding method as claimed in claim 4 also comprises step: use the M * M wavelet coefficient of described replacement to carry out inverse discrete wavelet transform, to produce the master image of mixing.
6, digital picture coding method as claimed in claim 5 also comprises step: receive encrypted code and with encrypted code with mix master image and compress.
7, a kind of digital image decoding device is used to recover to use watermark to be embedded in signature image on the master image, comprising:
Pseudorandom number generator is used to receive encrypted code, and produces pseudo random number according to the pre-defined rule corresponding to described encrypted code;
The coefficient separating part is used to use described pseudo random number to set the separation point position of N * N pixel, and separates in M * M wavelet coefficient the wavelet coefficient corresponding to described N * N pixel separation position, thus N * N wavelet coefficient of separating of output; With
The inverse discrete wavelet transform part is used to use N * N wavelet coefficient of described separation to carry out inverse discrete wavelet transform, thus the signature image of output recovery.
8, digital image decoding device as claimed in claim 7, wherein said pseudorandom number generator is included in the described coefficient separating part.
9, digital image decoding device as claimed in claim 7 also comprises:
The decompression part is used for receiving having and mixes master image and the bit stream that is compressed in the encrypted code of master image, and to described potential flow solution compression, to recover described encrypted code and master image; With
The wavelet transform part is used for the master image of recovering is carried out wavelet transform, exports M * M wavelet coefficient thus.
10, digital image decoding device as claimed in claim 8 also comprises:
The decompression part is used for receiving having and mixes master image and the bit stream that is compressed in the encrypted code of master image, and to described potential flow solution compression, to recover described encrypted code and master image; With
The wavelet transform part is used for the master image of recovering is carried out wavelet transform, exports M * M wavelet coefficient thus.
11, a kind of digital image decoding method is used to recover to use watermark to be embedded in signature image on the master image, may further comprise the steps:
Receive encrypted code, and produce pseudo random number according to pre-defined rule corresponding to described encrypted code;
Use described pseudo random number to set the separation point position of N * N pixel;
Corresponding to the wavelet coefficient of described N * N pixel separation position, export the N * N wavelet coefficient that separates thus in separation M * M wavelet coefficient; With
Use N * N wavelet coefficient of described separation to carry out inverse discrete wavelet transform, thus the signature image of output recovery.
12, digital image decoding method as claimed in claim 11, further comprising the steps of:
Reception has the bit stream that mixes master image and be compressed in the encrypted code in the master image, and to described potential flow solution compression, to recover described encrypted code and master image; With
The master image of recovering is carried out wavelet transform, export M * M wavelet coefficient thus.
13, a kind of digit image coding/decoding apparatus is used to use watermark to write down signature image on master image, and recovers described signature image from have the image that adds watermark that embeds the signature image on the master image, comprising:
The first wavelet transform part is used to receive master image and it is carried out wavelet transform, exports M * M discrete wavelet coefficient thus, and wherein M is a predetermined positive;
The second wavelet transform part is used to receive signature image and it is carried out wavelet transform, exports N * N discrete wavelet coefficient thus, and wherein N is the predetermined positive less than M;
First pseudorandom number generator is used to receive the encrypted code of the definite pre-defined rule that is used to produce pseudo random number, and produces pseudo random number according to the pre-defined rule corresponding to described encrypted code;
Coefficient is replaced part, be used to use described pseudo random number to select the replacement position of N * N pixel, and replace the coefficient of the replacement position of N * N pixel of selecting described in M * M discrete wavelet coefficient with N * N discrete wavelet coefficient, thus M * M the wavelet coefficient of output replacement.
Second pseudorandom number generator is used to receive encrypted code, and produces pseudo random number according to the pre-defined rule corresponding to described encrypted code;
The coefficient separating part, be used to use described pseudo random number to set the separation point position of N * N pixel, and corresponding to the wavelet coefficient of described N * N pixel separation position, export the N * N wavelet coefficient of signature image thus in the M * M wavelet coefficient of the master image that separation mixes; With
The inverse discrete wavelet transform part is used to use N * N wavelet coefficient of separation to carry out inverse discrete wavelet transform, thus the signature image of output recovery.
14, digit image coding/decoding apparatus as claimed in claim 13 also comprises:
The inverse discrete wavelet transform part is used to use the M * M wavelet coefficient of described replacement to carry out inverse discrete wavelet transform, to produce the master image of mixing;
The decompression part is used for receiving the bit stream that has described mixing master image and be compressed in the encrypted code of master image, and to described potential flow solution compression, to recover described encrypted code and master image; With
The wavelet transform part is used for the master image of described recovery is carried out wavelet transform, exports M * M wavelet coefficient thus.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US9154298P | 1998-07-01 | 1998-07-01 | |
| US60/091,542 | 1998-07-01 |
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| CN1256579A CN1256579A (en) | 2000-06-14 |
| CN1183739C true CN1183739C (en) | 2005-01-05 |
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| CNB991089316A Expired - Fee Related CN1183739C (en) | 1998-07-01 | 1999-07-01 | Digital image coding/decoding device and method for recording and recovering signature image |
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| JP (1) | JP2000101826A (en) |
| KR (1) | KR100389857B1 (en) |
| CN (1) | CN1183739C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100346353C (en) * | 2005-07-19 | 2007-10-31 | 电子科技大学 | Generating and vertification method for electronic seal based on vulnerable water mark |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020027569A (en) * | 2000-06-23 | 2002-04-13 | 요트.게.아. 롤페즈 | Watermark embedding method and arrangement |
| KR20030032411A (en) * | 2001-10-18 | 2003-04-26 | 김선형 | A digital watermaking method |
| KR100878518B1 (en) | 2001-12-03 | 2009-01-13 | 삼성전자주식회사 | Apparatus and method for embedding watermark into original information and transmitting watermarked information thereby and recovering watermark therefrom |
| CN100423579C (en) * | 2002-06-24 | 2008-10-01 | 皇家飞利浦电子股份有限公司 | Embedding of image authentication signatures |
| KR100526411B1 (en) * | 2002-07-12 | 2005-11-08 | 알파로직스(주) | Encryption and/or decryption apparatus and method for pictures data |
| KR100556848B1 (en) | 2003-05-13 | 2006-03-10 | 엘지전자 주식회사 | Apparatus and method for encoding and decoding moving picture using digital water marking |
| GB2408873A (en) * | 2003-12-01 | 2005-06-08 | Sony Uk Ltd | Generating marked material by introducing code words |
| JP4282520B2 (en) * | 2004-03-24 | 2009-06-24 | シャープ株式会社 | Signal processing method, signal output device, signal processing device, image processing device, and image forming device |
| CN100361437C (en) * | 2005-05-08 | 2008-01-09 | 中国科学院计算技术研究所 | Digital image hash signature method |
| GB201804818D0 (en) * | 2018-03-26 | 2018-05-09 | Data Signals Ltd | Method and apparatus for data obfuscation |
| CN108989816B (en) * | 2018-09-03 | 2021-05-14 | 广州海格通信集团股份有限公司 | Coding channel information hiding method based on wavelet transformation |
| CN109831596B (en) * | 2019-01-04 | 2020-01-17 | 北京邮电大学 | Image encryption method and device and electronic equipment |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO1998033324A2 (en) * | 1997-01-27 | 1998-07-30 | Koninklijke Philips Electronics N.V. | Embedding supplemental data in an encoded signal |
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1999
- 1999-06-25 KR KR10-1999-0024292A patent/KR100389857B1/en not_active IP Right Cessation
- 1999-06-30 JP JP18659199A patent/JP2000101826A/en active Pending
- 1999-07-01 CN CNB991089316A patent/CN1183739C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100346353C (en) * | 2005-07-19 | 2007-10-31 | 电子科技大学 | Generating and vertification method for electronic seal based on vulnerable water mark |
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| Publication number | Publication date |
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| KR100389857B1 (en) | 2003-07-04 |
| KR20000011330A (en) | 2000-02-25 |
| JP2000101826A (en) | 2000-04-07 |
| CN1256579A (en) | 2000-06-14 |
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