CN107105275B - A kind of information concealing method based on H.265 video pixel domain - Google Patents
A kind of information concealing method based on H.265 video pixel domain Download PDFInfo
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- CN107105275B CN107105275B CN201710500915.2A CN201710500915A CN107105275B CN 107105275 B CN107105275 B CN 107105275B CN 201710500915 A CN201710500915 A CN 201710500915A CN 107105275 B CN107105275 B CN 107105275B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/46—Embedding additional information in the video signal during the compression process
- H04N19/467—Embedding additional information in the video signal during the compression process characterised by the embedded information being invisible, e.g. watermarking
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
- H04N19/124—Quantisation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
- H04N19/129—Scanning of coding units, e.g. zig-zag scan of transform coefficients or flexible macroblock ordering [FMO]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
- H04N19/132—Sampling, masking or truncation of coding units, e.g. adaptive resampling, frame skipping, frame interpolation or high-frequency transform coefficient masking
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/60—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding
- H04N19/61—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding in combination with predictive coding
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/60—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding
- H04N19/625—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding using discrete cosine transform [DCT]
Abstract
The invention discloses a kind of information concealing methods based on H.265 video pixel domain, including are embedded in and extract；In embedded part, the pretreatment of secret information is carried out before the decoded high-rise i.e. parsing of NALU unit of video first；It after video is decoded to entropy decoding, is embedded according to video source time domain layer pixel value and embedding method, continues the video decoding of CTU rank after insertion is completed；It is extracting part: obtaining the carrier video by being embedded in and transmitting, carry out the configuration of Video coding；Before encoder compresses coding, the video time domain pixel data of current coded unit is obtained, the extraction of secret information is carried out according to extracting rule, continues the coding work of CTU after current CTU secret information extracts completion；Method provided by the invention carries out video steganography in the temporal levels of coding and decoding video, directly modifies the LSB bit of time domain pixel value, has the advantages that realize that simple and visual sensory is high-quality, and embedding information is to carrier video code rate increment rate very little.
Description
Technical field
The invention belongs to field of information security technology, more particularly, to a kind of information based on H.265 video pixel domain
Hidden method.
Background technique
It is secret information to be hidden in audio-video authorized person is allowed to receive that video, which is hidden, and unauthorized person can not but perceive its biography
Pass a kind of technology of behavior and content.Up to the present, domestic and international researcher proposes many nets using in existing network
The steganographic algorithm of network data flow (video, text, image etc.) progress secret communication.Position of these steganographic algorithms according to embedding information
It sets and is divided into three classes, the first kind is the preposition insertion video steganographic algorithm for being embedded in secret information in video original domain, is focused on
The embedding information in original video flowing, independent compression coding and the realization that secret information is extracted after extracting end decoding.The
Two classes are to consider the built-in insertion video steganographic algorithm for carrying out information insertion in the compressed domain, but hidden carrier is generally placed upon
In DCT coefficient before quantization or after quantization；It focuses on encoder combining with telescopiny.Third class is to consider regarding
The postposition that information insertion is carried out in frequency code stream is embedded in video steganographic algorithm, is absorbed in the video codes of insertion side directly upon compression
Secret information is embedded in stream, extraction side directly extracts secret information in the video code flow received, has real-time good, insertion
The big advantage of capacity.
The first kind, that is, preposition embedded mobile GIS is embedded in due to being in original domain, thus with strong excellent of undetectability
Point, but it does not fully consider the world substantially using H.264/AVC video encoding and decoding standard or technical standard before as background
The update of official's major video encoding and decoding technique, performance is poor in Video coding compression ratio, thus it is in practicability side
Face Shortcomings；It is especially higher and higher in the resolution requirements of video now, using 1080p as the HD video of representative gradually
Main trend as network video.And using H.264 as the video steganography scheme of carrying be unable to fully to meet little compressible and
High-resolution demand.Second class, that is, built-in embedded mobile GIS highlights the combination of encoder and telescopiny, if quantifying
It is embedded in preceding DCT coefficient, secret information can be lost because of quantizing process, thus such method robustness is not strong；If measuring
It is embedded in DCT coefficient after change, although quantizing process can be skipped, visual effect is bad and it realizes complexity.Third class method
I.e. rear-mounted embedded mobile GIS is realized simple, but since carrier of its modification is video code flow, the performance in terms of undetectability compared with
Difference, crypticity are not strong enough.
Summary of the invention
Aiming at the above defects or improvement requirements of the prior art, the present invention provides one kind based on H.265 video pixel domain
Information concealing method, its object is to improve the not sentience of secret information.
To achieve the above object, according to one aspect of the present invention, a kind of letter based on H.265 video pixel domain is provided
Cease hidden method, including secret information insertion and extraction；Its secret information embedding grammar includes the following steps:
(1) the network video ASCII stream file ASCII of carrier video is obtained, and the secret information of quasi- insertion is pre-processed, including
Binarization and addition end-of-message position, form binary bit stream；
(2) processing is unziped it to carrier video source, including to current coded unit (Code tree unit, CTU)
Entropy decoding, inverse transformation and inverse quantization；Before decoded video data is reconstructed, the smallest 4 × 4 block of pixels conduct is chosen
To be embedded piece, enter step (3)；
(3) judge whether there is the picture that can be used for secret information insertion in current 4 × 4 block of pixels according to the equal value difference of pixel domain
Vegetarian refreshments (m, n)；If so, (4) are entered step, if it is not, then entering step (5)；Wherein m, n are respectively embeddable pixel phase
Cross, ordinate for 4 × 4 block of pixels；
(4) pixel value that pretreated secret information is embedded into the pixel (m, n) of current 4 × 4 block of pixels is minimum
In significance bit, according to the pixel value Y of 4 × 4 block of pixelsM, nParity be embedded in bit 0 or 1；
If the bit of insertion is 1, the pixel value Y of 4 × 4 block of pixels is updated as the following formulam,n
If the bit of insertion is 0, the pixel value Y of 4 × 4 block of pixels is updated as the following formulaM, n:
(5) judge current 4 × 4 block of pixels whether be carrier video the last one encoding block, if so, entering step
(6)；If it is not, then entering next 4 × 4 block of pixels by Z-scan scanning sequency, (3) are entered step；
Wherein, Z-scan refers to Z-shaped scanning mode, is specifically documented in H.265 official's draft；
(6) video decoding and reconstituting is carried out to 4 × 4 block of pixels that insertion is completed, and enters step (7)；
(7) judge whether secret information has been inserted into completely, if then terminating；If it is not, then showing carrier video source capacity mistake
Few, secret information is not embedded into completely, and replacement carrier video source enters step (2).
Preferably, above-mentioned secret information embedding grammar, step (3) includes following sub-step:
(3.1) average pixel value for obtaining current 4 × 4 block of pixels is calculatedWherein, i, j refer to pixel
Cross, ordinate；
(3.2) the equal value difference Δ of pixel domain of each pixel in current 4 × 4 block of pixels is obtainedi,j(i,j∈{0,1,2,3})；
Wherein, the equal value difference of pixel domain refers to pixel value and the average pixel valueDifference；
It (3.3), will if the maximum pixel of the equal value difference of pixel domain has and there was only (m, n) one in current 4 × 4 block of pixels
Pixel (m, n) is used to be embedded in the position of secret information as current 4 × 4 block of pixels, enters step (4)；Wherein, m, n ∈ 0,
1,2,3}；
If the maximum pixel more than one of the equal value difference of pixel domain in current 4 × 4 block of pixels, current block is not carried out embedding
Enter, enters step (5).
The above-mentioned information concealing method based on H.265 video pixel domain, secret information extracting method specifically include following
Step:
(1) the carrier video for being loaded with secret information, and configuration parameter required for configuration code device, including coding layer are obtained
Grade, quantization parameter；
(2) before being compressed to carrier video, obtain each coding unit the smallest 4 × 4 block of pixels be used as to
Block is extracted, (3) are entered step；
(3) the extractible pixel (m, n) of current 4 × 4 block of pixels is selected and determined；Wherein m, n are extractable pixel
Cross, ordinate o'clock relative to 4 × 4 block of pixels；
(4) according to pixel value Ym,nParity extract secret information according to the following formula from current 4 × 4 block of pixels (m, n) position
k；
(5) judge current 4 × 4 block of pixels whether be carrier video the last one encoding block, if so, entering step
(6)；If it is not, then entering next 4 × 4 block of pixels by Z-scan scanning sequency, (3) are entered step；
(6) Video coding compression is carried out to 4 × 4 block of pixels that extraction is completed, and enters step (7)；
(7) judge whether secret information has extracted completely, i.e., whether extracted stop bit；If then terminating；If it is not, then
Show extracted secret information.
Preferably, the step of secret information extracting method (3) includes following sub-step:
(3.1) average pixel value of current 4 × 4 block of pixels is calculated
(3.2) the equal value difference Δ of pixel domain of each pixel in current 4 × 4 block of pixels is calculatedi,j(i,j∈{0,1,2,3})；
Wherein, the equal value difference of pixel domain refers to pixel value and the average pixel valueDifference；
It (3.3), will if the maximum pixel of the equal value difference of pixel domain has and there was only (m, n) one in current 4 × 4 block of pixels
Pixel (m, n) enters step (4) as the position for extracting secret information in current 4 × 4 block of pixels；
If the maximum pixel more than one of the equal value difference of pixel domain in current 4 × 4 block of pixels, not to current 4 × 4 pixel
Block extracts, and enters step (5).
In general, through the invention it is contemplated above technical scheme is compared with the prior art, can obtain down and show
Beneficial effect:
(1) information concealing method provided by the invention based on H.265 video pixel domain, with existing video steganographic algorithm
It compares, H.265/HEVC the present invention is suitable for international newest video encoding and decoding standard, and use time domain (i.e. pixel domain)
Steganography scheme has Information hiding communications platform simple, it is easy to accomplish the characteristics of；
(2) information concealing method provided by the invention based on H.265 video pixel domain, with other existing video steganography
Scheme is compared, storage characteristics of the present invention due to having fully considered video content time domain pixel value, in the time domain of coding and decoding video
Rank carries out video steganography, and LSB (the Least Significant of time domain pixel position is directly modified using corresponding modulator approach
Bits) position is embedded in, and is effectively guaranteed the visual effect of carrier video, the undetectability with Information hiding；Due to
Secret information is minimum relative to video file change, thus carrier video code rate increment rate very little；
(3) information concealing method provided by the invention based on H.265 video pixel domain, with existing other numbers having
Watermarking project is compared, and from background technique, it can be seen that, the technology that the present invention is suitable for network today HD video is realized；Due to existing
Modern network video stream accounts for about the 90% of internet traffic, therefore its application environment is extremely wide, be easy to apply and hiding information not
It is easy to be found；
(4) information concealing method provided by the invention based on H.265 video pixel domain, it is contemplated that in built-in end and extract
The operation at end it is asynchronous, i.e., extract end can not differentiate that built-in end is embedded in the secret information of how many bit, in secret information
End-of-message position is added in bit stream, boundary demarcation is carried out to binary bit stream, encounters secret information to work as at extraction end
Boundary when Stop message continue to extract, improve the encoding-decoding efficiency of video.
Detailed description of the invention
Fig. 1 is the overall flow schematic diagram for the information concealing method based on H.265 video pixel domain that embodiment provides；
Fig. 2 is that the process of the embedding grammar for the information concealing method based on H.265 video pixel domain that embodiment provides is shown
It is intended to；
Fig. 3 is that the process of the extracting method for the information concealing method based on H.265 video pixel domain that embodiment provides is shown
It is intended to.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below
Not constituting a conflict with each other can be combined with each other.
The embedding grammar for the information concealing method based on H.265 video pixel domain that embodiment provides, overall flow is such as
Shown in Fig. 1, including it is embedded in and extracts.Wherein, the process of secret information insertion is as shown in Fig. 2, specifically comprise the following steps:
(1) the network video ASCII stream file ASCII of carrier video is obtained, and the secret information of quasi- insertion is pre-processed, including
Binarization and addition end-of-message position, form binary bit stream；Wherein end-of-message position is 16bit, in the present embodiment
End-of-message position be 0x0001；
(2) processing unziped it to carrier video source, including to current coded unit CTU entropy decoding, inverse transformation and anti-
Quantization；Before decoded video data is reconstructed, the smallest 4 × 4 block of pixels is chosen as to be embedded piece, is entered step
(3)；
(3) judge whether there is the picture that can be used for secret information insertion in current 4 × 4 block of pixels according to the equal value difference of pixel domain
Vegetarian refreshments (m, n)；If so, (4) are entered step, if it is not, current 4 × 4 block of pixels enters step (5) without insertion；
Wherein m, n are respectively cross, ordinate of the embeddable pixel relative to 4 × 4 block of pixels；
This step includes following sub-step:
(3.1) average pixel value for obtaining current 4 × 4 block of pixels is calculated
(3.2) the equal value difference Δ of pixel domain of each position in current 4 × 4 block of pixels is calculatedi,j(i,j∈{0,1,2,3})；
It (3.3), will if the maximum pixel of the equal value difference of pixel domain has and there was only (m, n) one in current 4 × 4 block of pixels
Pixel (m, n) is used to be embedded in the position of secret information as current 4 × 4 block of pixels, enters step (4)；Wherein, m, n ∈ 0,
1,2,3}；
If the maximum pixel more than one of the equal value difference of pixel domain in current 4 × 4 block of pixels, current block is not carried out embedding
Enter, enters step (5)；
(4) pretreated secret information is embedded into the LSB of pixel (m, n) of current 4 × 4 block of pixels, according to 4
The pixel value Y of × 4 block of pixelsm,nParity be embedded in bit 0 or 1；
If the bit of insertion is 1, the pixel value Y of 4 × 4 block of pixels is updated as the following formulaM, n
If the bit of insertion is 0, the pixel value Y of 4 × 4 block of pixels is updated as the following formulaM, n:
(5) judge current 4 × 4 block of pixels whether be carrier video the last one encoding block, if so, entering step
(6), if it is not, then entering next 4 × 4 block of pixels by Z-scan scanning sequency, (3) are entered step；
(6) video decoding and reconstituting is carried out to 4 × 4 block of pixels that insertion is completed, and enters step (7)；
(7) judge whether secret information has been inserted into completely, if then terminating；If it is not, then showing carrier video source capacity mistake
Few, secret information is not embedded into completely, and replacement carrier video source enters step (2).
In order to smoothly extract end extraction information, according to the secret information of quasi- insertion to the pixel value of current position to be embedded
Ym,nModified equal value difference absolute value should be made not less than the equal value difference absolute value before modification when modifying, to guarantee to extract position
The accuracy set.
It is described as follows in conjunction with specific example: assuming that secret information is { s1,s2,......,sp}={ Zhengzhou, then pre- place
Secret information after reason are as follows:
110101101010001111010110110111010000000000000001
Carrier video source is official's test video BasketballPass, is carried out to carrier video BasketballPass
After entropy decoding, according to the side of coding unit time domain pixel value and the smallest 4 × 4 block of pixels and step (3) after reconstruct
Method determines embedded location；First frame LCU allocation index is 0, and when 4 × 4 block of pixels when index is 12 in block meets condition,
Average pixel value Y is 127, and the embeddable position of selection is (0,0)；Get the time-domain coefficients value of 4 × 4 block of pixels are as follows:
| 123 | 124 | 124 | 124 |
| 128 | 129 | 129 | 130 |
| 127 | 127 | 128 | 129 |
| 129 | 129 | 129 | 129 |
Time-domain coefficients value after being embedded in secret information 0 according to the above method are as follows:
| 122 | 124 | 124 | 124 |
| 128 | 129 | 129 | 130 |
| 127 | 127 | 128 | 129 |
| 129 | 129 | 129 | 129 |
The subsequent decoding process for continuing current prediction unit residual error coefficient is completed in insertion.
As shown in figure 3, be the extracting method for the information concealing method based on H.265 video pixel domain that embodiment provides
Flow chart, specifically includes the following steps:
(1) the carrier video for being loaded with secret information, and configuration parameter required for configuration code device, including coding layer are obtained
Grade, quantization parameter；
(2) before being compressed to carrier video, obtain each coding unit the smallest 4 × 4 block of pixels be used as to
Block is extracted, (3) are entered step；
(3) the extractible pixel (m, n) of current 4 × 4 block of pixels is selected and determined；Wherein (m, n) is extractible
Coordinate of the pixel relative to 4 × 4 block of pixels；
The step includes following sub-step:
(3.1) average pixel value of current 4 × 4 block of pixels is calculated
(3.2) the equal value difference Δ of the pixel domain for each pixel being calculated separately according to the average pixel value of block of pixelsi,j(i,j∈
{0,1,2,3})；Wherein, the equal value difference of pixel domain refers to pixel value and the average pixel valueDifference；
It (3.3), will if the maximum pixel of the equal value difference of pixel domain has and there was only (m, n) one in current 4 × 4 block of pixels
Pixel (m, n) enters step (4) as the position for extracting secret information in current 4 × 4 block of pixels；
If the maximum pixel more than one of the equal value difference of pixel domain in current 4 × 4 block of pixels, not to current 4 × 4 pixel
Block extracts, and enters step (5)；
(4) to secret information extraction is carried out at the pixel (m, n) of current 4 × 4 block of pixels, according to pixel value Ym,nSurprise
Idol extracts secret information k according to the following formula；
(5) judge current 4 × 4 block of pixels whether be carrier video the last one encoding block, if so, entering step
(6)；If it is not, then entering next 4 × 4 block of pixels by Z-scan scanning sequency, (3) are entered step；
(6) Video coding compression is carried out to 4 × 4 block of pixels that extraction is completed, and is transferred to step (7)；
(7) judge whether secret information has extracted completely, i.e., whether extracted stop bit 0x0001；If then terminating；
If it is not, showing that carrier video source capacity is very few, then extracted secret information is shown.
By carrying out taking buf data, processing tail portion filling bit, inverse binarization to the secret information extracted, also
Original goes out original private information.
Be described as follows in conjunction with example: the carrier video received is BasketballPass, is carrying out coding unit
Compressed encoding before, it is assumed that the coding unit of currently embedded secret information is first frame, LCU allocation index is 0, index in block
Meet condition when being 12, i.e. its average pixel valueIt is 127, embedded location is (0,0).Get the block of pixels of current v4 × 4
Residual coefficient matrix are as follows:
| 122 | 124 | 124 | 124 |
| 128 | 129 | 129 | 130 |
| 127 | 127 | 128 | 129 |
| 129 | 129 | 129 | 129 |
It is 0 according to the secret information bit that said extracted method is extracted；Continue subsequent coding unit 4 × 4
The secret information of block of pixels extracts, and until extracting end-of-message position, completes the extraction of secret information.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include
Within protection scope of the present invention.
Claims (5)
1. a kind of information concealing method based on H.265 video pixel domain, including secret information insertion and extraction；Its feature exists
In secret information embedding grammar includes the following steps:
(I) the network video ASCII stream file ASCII for obtaining carrier video, and pre-processes the secret information of quasi- insertion, formed two into
Bit stream processed；
(II) processing is unziped it to carrier video source, including to current coded unit entropy decoding, inverse transformation and inverse quantization；?
Before decoded video data is reconstructed, 4 × 4 block of pixels are chosen as to be embedded piece, enter step (III)；
(III) judge whether there is the pixel that can be used for secret information insertion in current 4 × 4 block of pixels according to the equal value difference of pixel domain
Point (m, n)；If so, (IV) is entered step, if it is not, then entering step (V)；
Wherein m, n are respectively cross, ordinate of the embeddable pixel relative to 4 × 4 block of pixels；
(IV) pretreated secret information is embedded into current 4 × 4 block of pixels in the LSB of the position pixel (m, n), according to
The pixel value Y of 4 × 4 block of pixelsm,nParity be embedded in bit 0 or 1；
(V) judge whether current 4 × 4 block of pixels is the last one encoding block of carrier video, if so, (VI) is entered step,
If it is not, then entering next 4 × 4 block of pixels by Z-scan scanning sequency, (III) is entered step；
(VI) video decoding and reconstituting is carried out to 4 × 4 block of pixels that insertion is completed, and enters step (VII)；
(VII) judge whether secret information has been inserted into completely, if then terminating；It is entered step if it is not, then replacing carrier video source
(II)。
2. information concealing method as described in claim 1, which is characterized in that its step (III) includes following sub-step:
(III.1) average pixel value for obtaining current 4 × 4 block of pixels is calculatedWherein, i, j refer to pixel
Horizontal, ordinate；
(III.2) the equal value difference Δ of pixel domain of each pixel in current 4 × 4 block of pixels is obtainedi,j(i,j∈{0,1,2,3})；Its
In, the equal value difference of pixel domain refers to pixel value and the average pixel valueDifference；
(III.3) if the maximum pixel of the equal value difference of pixel domain has and there was only (m, n) one in current 4 × 4 block of pixels, by picture
Vegetarian refreshments (m, n) is used to be embedded in the position of secret information as current 4 × 4 block of pixels, enters step (IV)；Wherein, m, n ∈ 0,
1,2,3}；
If the maximum pixel more than one of the equal value difference of pixel domain, enters step (V) in current 4 × 4 block of pixels.
3. information concealing method as claimed in claim 2, which is characterized in that if the bit of insertion is 1, update 4 as the following formula
The pixel value Y of × 4 block of pixelsm,n；
If the bit of insertion is 0, the pixel value Y of 4 × 4 block of pixels is updated as the following formulaM, n:
4. information concealing method as claimed in claim 1 or 2, which is characterized in that secret information extracting method specifically include with
Lower step:
(i) the carrier video for being loaded with secret information, and configuration parameter required for configuration code device, including coding level are obtained,
Quantization parameter；
(ii) before compressing to carrier video, the smallest block of pixels of each coding unit is obtained as possible wait mention
Block is taken, (iii) is entered step；
(iii) the extractable position (m, n) of current 4 × 4 block of pixels is selected and determined；
Wherein (m, n) is extractable coordinate of the position relative to 4 × 4 block of pixels；
(iv) according to pixel value Ym,nParity extract secret letter according to the following formula from the pixel (m, n) of current 4 × 4 block of pixels
Cease k；
(v) judge whether current 4 × 4 block of pixels is the last one encoding block of carrier video, if so, entering step (vi)；
If it is not, then entering next 4 × 4 block of pixels by Z-scan scanning sequency, (iii) is entered step；
(vi) Video coding compression is carried out to 4 × 4 block of pixels that extraction is completed, and is transferred to step (vii)；
(vii) judge whether secret information has extracted completely, i.e., whether extracted stop bit；If then terminating；If it is not, then showing
Show extracted secret information.
5. information concealing method as claimed in claim 4, which is characterized in that (iii) is wrapped the step of secret information extracting method
Include following sub-step:
(iii.1) average pixel value of current 4 × 4 block of pixels is calculated
(iii.2) the equal value difference Δ of pixel domain of each pixel in current 4 × 4 block of pixels is calculatedi,j(i,j∈{0,1,2,3})；Its
In, the equal value difference of pixel domain refers to pixel value and the average pixel valueDifference；
(iii.3) if the maximum pixel of the equal value difference of pixel domain has and there was only (m, n) one in current 4 × 4 block of pixels, by picture
Vegetarian refreshments (m, n) enters step (iv) as the position for extracting secret information in current 4 × 4 block of pixels；
If the maximum pixel more than one of the equal value difference of pixel domain, enters step (v) in current 4 × 4 block of pixels.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104125467A (en) * | 2014-08-01 | 2014-10-29 | 郑州师范学院 | Embedding and extracting methods for video steganography information |
| CN104539965A (en) * | 2015-01-12 | 2015-04-22 | 中国电子科技集团公司第三十八研究所 | H.264/AVC compressed-domain video watermark embedding and extracting method |
| CN104581176A (en) * | 2014-12-26 | 2015-04-29 | 宁波大学 | H.264/AVC (advanced video coding) compressed domain robust video watermark embedding and extracting methods free from intra-frame error drift |
| CN105721873A (en) * | 2016-02-03 | 2016-06-29 | 西安电子科技大学 | Hidden transmission method based on MPEG4/2 |
| CN106817586A (en) * | 2016-12-22 | 2017-06-09 | 宁波工程学院 | A kind of H.264/AVC video reversible data concealing method |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104125467A (en) * | 2014-08-01 | 2014-10-29 | 郑州师范学院 | Embedding and extracting methods for video steganography information |
| CN104581176A (en) * | 2014-12-26 | 2015-04-29 | 宁波大学 | H.264/AVC (advanced video coding) compressed domain robust video watermark embedding and extracting methods free from intra-frame error drift |
| CN104539965A (en) * | 2015-01-12 | 2015-04-22 | 中国电子科技集团公司第三十八研究所 | H.264/AVC compressed-domain video watermark embedding and extracting method |
| CN105721873A (en) * | 2016-02-03 | 2016-06-29 | 西安电子科技大学 | Hidden transmission method based on MPEG4/2 |
| CN106817586A (en) * | 2016-12-22 | 2017-06-09 | 宁波工程学院 | A kind of H.264/AVC video reversible data concealing method |
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