CN107330843A - A kind of gray level image coding hidden method and device, coding/decoding method and device - Google Patents
A kind of gray level image coding hidden method and device, coding/decoding method and device Download PDFInfo
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Abstract
The invention belongs to Digital Image Hiding Method field, more particularly to a kind of gray level image coding hidden method and device, coding/decoding method and device.Transmitting terminal carries out JPEG codings to gray level image first；On the basis of JPEG codings, Bose-Chaudhuri-Hocquenghem Code is carried out；The binary picture data string encoded by JPEG and Bose-Chaudhuri-Hocquenghem Code is obtained is hidden in binary hologram and is transferred to receiving terminal.Receiving terminal is decoded using BCH corresponding with transmitting terminal and JPEG coding/decoding methods recover to the gray level image being hidden in binary hologram, finally recovers more visible original-gray image.The method being combined with Bose-Chaudhuri-Hocquenghem Code is encoded as a result of JPEG, and JPEG decodings and BCH decode the method being combined, so that gray level image is difficult to be disturbed by noise during binary hologram vehicle treated, hiding and transmission, the quality of the image of recovery is substantially increased.
Description
Technical field
The invention belongs to Digital Image Hiding Method field, more particularly to a kind of gray level image coding hidden method and dress
Put, coding/decoding method and device.
Background technology
In the present big data epoch, information generation, transmission and the processing for having magnanimity daily, information security are an extremely passes
Important subject under discussion.Information Hiding Techniques can be protected to electronic information during transmission and storage, prevent from being leaked to non-
Method user.
Digital hologram, can be hidden as a suitable information due to having the advantages that Information hiding is not easy to be found
Hide carrier.Gray level image is hidden in binary digit hologram (binary hologram), because data format is inconsistent,
Need to be compressed coding to hiding gray level image, existing method includes error diffusion (error diffusion), cuts based on block
Disconnected coding (block truncation coding) etc..
But, original-gray image via above-mentioned method compress and hide after, the image recovered tend to by
The severe jamming of noise, causes picture quality to be remarkably decreased, and above-mentioned Image Lossy Compression method can inherently make original image
Middle bulk information is lost and can not recovered.
The content of the invention
The technical problems to be solved by the invention encode hidden method and device, coding/decoding method to provide a kind of gray level image
And device, it is intended to existing gray level image is solved after overcompression, hiding, recovery, and obtained image is vulnerable to the tight of noise
Disturb again, the problem of causing poor image quality.
In order to solve the above technical problems, the present invention is achieved in that the invention provides a kind of gray level image coding is hidden
Tibetan method, methods described includes：
Transmitting terminal is encoded using JPEG coding methods to gray level image, obtains jpeg encoded data string, and will be described
The decimal data of jpeg encoded data string is converted into binary data；
The binary data of the jpeg encoded data string is divided into several binary data small pieces by the transmitting terminal,
Several described binary data small pieces are carried out with Bose-Chaudhuri-Hocquenghem Code respectively, and by several binary data small pieces after Bose-Chaudhuri-Hocquenghem Code
Combination producing binary system greyscale image data string successively；
The random number that the transmitting terminal is inputted according to user generates Substitution Rules, according to the Substitution Rules, with described
Every bit data in binary system greyscale image data string replaces the Binary Image of correspondence position in preset binary hologram
Element value, to obtain concealing the binary hologram of gray level image；
The transmitting terminal sends the binary hologram for concealing gray level image to receiving terminal.
Further, the transmitting terminal is encoded using JPEG coding methods to gray level image, obtains JPEG coded numbers
Include according to string：
The gray level image is divided into the image fritter of several 8*8 pixels by the transmitting terminal；
Discrete cosine transform is carried out respectively to the 8*8 of several described image fritters pixel value, discrete cosine change is obtained
Change pixel value；
Non-uniform quantizing processing is carried out respectively to the discrete cosine transform pixel value of several described image fritters, obtains non-
Discrete cosine transform pixel value after uniform quantization processing；
Lossless entropy code is carried out respectively to the discrete cosine transform pixel value after non-uniform quantizing processing several described, obtained
To after several lossless entropy code subdata strings, it is combined according to the segmentation order of described image fritter, forms JPEG codings
Serial data.
Further, the binary data of the jpeg encoded data string is divided into several binary systems by the transmitting terminal
Data small pieces include：
The error correcting capability of Bose-Chaudhuri-Hocquenghem Code is determined according to default noise intensity, is calculated using the error correcting capability of the Bose-Chaudhuri-Hocquenghem Code
To the total information bit length of Bose-Chaudhuri-Hocquenghem Code；
By segmentation unit of the total information bit length of the Bose-Chaudhuri-Hocquenghem Code by the binary data of the jpeg encoded data string
Several binary data small pieces are divided into successively according to vertical order.
Present invention also offers a kind of gray level image coding/decoding method, methods described includes：
The binary hologram for hiding gray level image that receiving terminal receiving end/sending end is sent；
The random number that the receiving terminal is inputted according to user generates Substitution Rules, according to the Substitution Rules to described two
Binary system greyscale image data string in system hologram is extracted；
The binary system greyscale image data string of extraction is divided into several binary data small pieces by the receiving terminal,
BCH decodings are carried out respectively to several described binary data small pieces, to obtain jpeg encoded data string；
The binary data of the jpeg encoded data string is converted into decimal data by the receiving terminal, and utilizes JPEG
Coding/decoding method is decoded to the decimal data of the jpeg encoded data string, obtains hiding gray level image.
Further, the binary system greyscale image data string of extraction is divided into several binary systems by the receiving terminal
Data small pieces include：
The total information bit length of the Bose-Chaudhuri-Hocquenghem Code obtained when carrying out Bose-Chaudhuri-Hocquenghem Code using transmitting terminal, determines total letter of BCH decodings
Cease bit length；Using the BCH decode total information bit length for split unit by the binary system greyscale image data string according to
Vertical order is divided into several binary data small pieces successively.
Further, it is described that the decimal data of the jpeg encoded data string is solved using JPEG coding/decoding methods
Code, obtaining hiding gray level image includes：
To the jpeg encoded data string according to the jpeg data string size corresponding to the image fritter of 8*8 pixels one by one according to
It is secondary to be split, lossless entropy decoding is carried out respectively to several obtained lossless entropy code subdata strings, several 8*8 pictures are obtained
The non-uniform quantizing pixel value array of discrete cosine transform corresponding to the image fritter of element；
Non-uniform quantizing pixel value array to discrete cosine transform several described is carried out at non-homogeneous inverse quantization respectively
Reason, to obtain the discrete cosine transform pixel value array after several non-homogeneous inverse quantization processing；
Discrete cosine transform pixel value array after non-homogeneous inverse quantization processing several described is carried out respectively discrete remaining
String inverse transformation, obtains the image fritter of several 8*8 pixels；
The image fritter of several 8*8 pixels is combined, hiding gray level image is recovered.
Concealing device is encoded present invention also offers a kind of gray level image, described device includes：
JPEG coding modules, for being encoded using JPEG coding methods to gray level image, obtain jpeg encoded data
String, and the decimal data of the jpeg encoded data string is converted into binary data；
Bose-Chaudhuri-Hocquenghem Code module, for the binary data of the jpeg encoded data string to be divided into several binary numbers
According to small pieces, several described binary data small pieces are carried out with Bose-Chaudhuri-Hocquenghem Code respectively, and by several binary systems after Bose-Chaudhuri-Hocquenghem Code
Data small pieces combination producing binary system greyscale image data string successively；
Hidden module, the random number for being inputted according to user generates Substitution Rules, according to the Substitution Rules, uses institute
State the binary system that every bit data in binary system greyscale image data string replaces correspondence position in preset binary hologram
Pixel value, to obtain concealing the binary hologram of gray level image；
Sending module, for the binary hologram for concealing gray level image to be sent to receiving terminal.
Further, the Bose-Chaudhuri-Hocquenghem Code module includes：
Code division rule generation module, the error correcting capability for determining Bose-Chaudhuri-Hocquenghem Code according to default noise intensity, utilizes institute
The error correcting capability for stating Bose-Chaudhuri-Hocquenghem Code calculates the total information bit length for obtaining Bose-Chaudhuri-Hocquenghem Code；
Binary data small pieces code division module, for using the total information bit length of the Bose-Chaudhuri-Hocquenghem Code as segmentation unit
The binary data of the jpeg encoded data string is divided into several binary data successively according to vertical order
Small pieces；
Binary system greyscale image data string generation module, for being carried out respectively to several described binary data small pieces
Bose-Chaudhuri-Hocquenghem Code, and by several binary data small pieces after Bose-Chaudhuri-Hocquenghem Code successively combination producing binary system greyscale image data string.
Present invention also offers a kind of gray level image decoding apparatus, described device includes：
Receiving module, the binary hologram for hiding gray level image sent for receiving end/sending end；
Hidden image extraction module, the random number for being inputted according to user generates Substitution Rules, is replaced according to described
Rule is extracted to the binary system greyscale image data string in the binary hologram；
BCH decoder modules, for the binary system greyscale image data string of extraction to be divided into several binary numbers
According to small pieces, BCH decodings are carried out respectively to several described binary data small pieces, to obtain jpeg encoded data string；
JPEG decoder modules, for the binary data of the jpeg encoded data string to be converted into decimal data, and
The decimal data of the jpeg encoded data string is decoded using JPEG coding/decoding methods, hiding gray level image is obtained.
Further, the BCH decoder modules include：
Decoding segmentation rule generation module, the total information of the Bose-Chaudhuri-Hocquenghem Code obtained during for carrying out Bose-Chaudhuri-Hocquenghem Code using transmitting terminal
Bit length, determines the total information bit length of BCH decodings；Binary data small pieces decoding segmentation module, for being decoded with the BCH
Total information bit length for segmentation unit the binary system greyscale image data string is split successively according to vertical order
Into several binary data small pieces；
Jpeg encoded data string generation module, for carrying out BCH decodings respectively to several described binary data small pieces,
To obtain jpeg encoded data string.
Compared with prior art, beneficial effect is the present invention：
A kind of gray level image coding hidden method and device provided by the present invention, carry out joint figure to gray level image first
As expert group (Joint Picture Expert Group, JPEG) coding；On the basis of JPEG codings, BCH is carried out
(Bose, Ray-Chaudhuri, Hocquenghem) is encoded；The image concealing encoded by JPEG and Bose-Chaudhuri-Hocquenghem Code is obtained is existed
Receiving terminal is transferred in binary hologram.A kind of gray level image coding/decoding method and device provided by the present invention, receiving terminal are adopted
The gray level image being hidden in binary hologram is carried out with BCH corresponding with transmitting terminal decodings and JPEG coding/decoding methods extensive
It is multiple, finally recover more visible original-gray image.The method being combined with Bose-Chaudhuri-Hocquenghem Code is encoded as a result of JPEG, with
And JPEG decodings and BCH decode the method being combined so that image to be concealed is difficult in binary hologram vehicle treated, hidden
With disturbed during transmission by noise, substantially increase the quality of the image of recovery.
Brief description of the drawings
Fig. 1 is a kind of gray level image coding hidden method flow chart provided in an embodiment of the present invention；
Fig. 2 is a kind of gray level image coding hidden method flow chart provided in an embodiment of the present invention；
Fig. 3 is a kind of gray level image coding hidden method flow chart provided in an embodiment of the present invention；
Fig. 4 is a kind of gray level image coding/decoding method flow chart provided in an embodiment of the present invention；
Fig. 5 is a kind of gray level image coding/decoding method flow chart provided in an embodiment of the present invention；
Fig. 6 is a kind of gray level image coding/decoding method flow chart provided in an embodiment of the present invention；
Fig. 7 is a kind of gray level image coding concealing device schematic diagram provided in an embodiment of the present invention；
Fig. 8 is the JPEG coding module schematic diagrames that a kind of gray level image provided in an embodiment of the present invention encodes concealing device；
Fig. 9 is the Bose-Chaudhuri-Hocquenghem Code module diagram that a kind of gray level image provided in an embodiment of the present invention encodes concealing device；
Figure 10 is a kind of gray level image decoding apparatus schematic diagram provided in an embodiment of the present invention；
Figure 11 is a kind of BCH decoder module schematic diagrames of gray level image decoding apparatus provided in an embodiment of the present invention；
Figure 12 is a kind of JPEG decoder module schematic diagrames of gray level image decoding apparatus provided in an embodiment of the present invention；
Figure 13 is a kind of gray level image hidden method schematic diagram provided in an embodiment of the present invention.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
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 one embodiment of the present invention, as shown in figure 1, hiding side the invention provides a kind of gray level image coding
Method, this method includes：
Step S101：Transmitting terminal is encoded using JPEG coding methods to gray level image, obtains jpeg encoded data string,
And the decimal data of the jpeg encoded data string is converted into binary data.
Step S102：The binary data of above-mentioned jpeg encoded data string is divided into several binary data by transmitting terminal
Several binary data small pieces are carried out Bose-Chaudhuri-Hocquenghem Code by small pieces respectively, and by several binary data after Bose-Chaudhuri-Hocquenghem Code
Small pieces combination producing binary system greyscale image data string successively.
Step S103：The random number that transmitting terminal is inputted according to user generates Substitution Rules, by the Substitution Rules, with above-mentioned
Every bit data in binary system greyscale image data string replaces the Binary Image of correspondence position in preset binary hologram
Element value, to obtain concealing the binary hologram of gray level image.
Step S104：Transmitting terminal sends the binary hologram for concealing gray level image to receiving terminal.
In summary, a kind of gray level image coding hidden method that first embodiment of the invention is provided, utilizes JPEG
The method that coding and Bose-Chaudhuri-Hocquenghem Code are combined carries out coded treatment to image to be concealed, and the image concealing after coded treatment is arrived
In binary hologram, transmitting terminal sends the binary hologram for concealing gray level image to receiving terminal.Due to JPEG codings
Image file size can be substantially reduced in the case where ensureing still image quality requirements, Bose-Chaudhuri-Hocquenghem Code, which has, very strong resists various make an uproar
Acoustic jamming and error correcting capability, both are combined, and can both reduce being hidden image data amount size, can strengthen anti-noise again
Acoustic energy power, finally causes gray level image to be difficult during binary hologram vehicle treated, hiding and transmission by noise
Interference, substantially increase the quality of the image of recovery.
As second embodiment of the present invention, as Figure 1-3, hidden the invention provides a kind of gray level image coding
Method, this method includes：
Step S101：Transmitting terminal is encoded using JPEG coding methods to gray level image, obtains jpeg encoded data string,
And the decimal data of the jpeg encoded data string is converted into binary data.
As shown in Fig. 2 step S101 comprises the following steps:
Step S101-1：Gray level image is divided into the image fritter of several 8*8 pixels by transmitting terminal.
Step S101-2：Discrete cosine transform is carried out respectively to the 8*8 of several image fritters pixel value, obtains discrete
Cosine transform pixel value.
Step S101-3：The discrete cosine transform pixel value of several image fritters is carried out at non-uniform quantizing respectively
Reason, obtains the discrete cosine transform pixel value after non-uniform quantizing processing.
Step S101-4：Lossless entropy is carried out respectively to the discrete cosine transform pixel value after the processing of several non-uniform quantizings
Coding, is obtained after several lossless entropy code subdata strings, is combined according to the segmentation order of image fritter, is formed JPEG and compile
Code serial data.
Step S101-5：The decimal data of jpeg encoded data string is converted into binary data.
Step S102：The binary data of above-mentioned jpeg encoded data string is divided into several binary data by transmitting terminal
Several binary data small pieces are carried out Bose-Chaudhuri-Hocquenghem Code by small pieces respectively, and by several binary data after Bose-Chaudhuri-Hocquenghem Code
Small pieces combination producing binary system greyscale image data string successively.
As shown in figure 3, step S102 comprises the following steps:
Step S102-1：The error correcting capability of Bose-Chaudhuri-Hocquenghem Code is determined according to default noise intensity, the error correction energy of Bose-Chaudhuri-Hocquenghem Code is utilized
Power calculates the total information bit length for obtaining Bose-Chaudhuri-Hocquenghem Code.It should be noted that the default noise intensity is usually prediction transmit process
In the maximum noise that might have, be default noise intensity by the intensity settings of the maximum noise of the prediction, so that entangling
Wrong ability can must so may insure that hiding image can be extensive all due to error correcting caused by influence of noise
Appear again and.
In the present embodiment, by formula n=2m- 1 (m >=3, m ∈ Z) and formula n-k≤m (t ＜ m/2) determine Bose-Chaudhuri-Hocquenghem Code
Error correcting capability t, according to the error correcting capability t of Bose-Chaudhuri-Hocquenghem Code calculate obtain information bit length k, according to information bit length k calculate obtain
The total information length n of Bose-Chaudhuri-Hocquenghem Code, wherein, m is the non-zero positive integer determined according to practical situations, and Z represents non-zero just
Integer set.It should be noted that after the total information length n of Bose-Chaudhuri-Hocquenghem Code is determined, sender user can be manual by n
It is input in system, so as to proceed step S102-2 operation.The user of transmitting terminal is needed the total information of the Bose-Chaudhuri-Hocquenghem Code
Length n informs the user of receiving terminal, to ensure that receiving terminal can carry out corresponding behaviour with the total information length n of same units
Make.
Step S102-2：Using the total information bit length of the Bose-Chaudhuri-Hocquenghem Code as segmentation unit, the two of jpeg encoded data string are entered
Data processed are divided into several binary data small pieces successively according to vertical order.
Step S102-3：To this, several binary data small pieces carry out Bose-Chaudhuri-Hocquenghem Code respectively, and if by after Bose-Chaudhuri-Hocquenghem Code
Do binary data small pieces combination producing binary system greyscale image data string successively.
Step S103：The random number that transmitting terminal is inputted according to user generates Substitution Rules, by the Substitution Rules, with above-mentioned
Every bit data in binary system greyscale image data string replaces the Binary Image of correspondence position in preset binary hologram
Element value, to obtain concealing the binary hologram of gray level image.In the present embodiment, transmitting terminal has the life for randomly generating sequence
Grow up to be a useful person, user is inputted after arbitrary random number, and the maker for randomly generating sequence automatically generates replacement according to the random number
Rule.
Step S104：Transmitting terminal sends the binary hologram for concealing binary system gray level image to receiving terminal.Need
Illustrate, the user of transmitting terminal needs the random number being inputted to tell the user of receiving terminal, the user of such receiving terminal
Just identical random number can be inputted in receiving terminal, so that receiving terminal can be extracted and hidden using operation corresponding with transmitting terminal
Image.
In summary, a kind of gray level image coding hidden method that second embodiment of the invention is provided, utilizes JPEG
The method that coding and Bose-Chaudhuri-Hocquenghem Code are combined carries out coded treatment to image to be concealed, and the image concealing after coded treatment is arrived
In binary hologram, transmitting terminal sends the binary hologram for concealing gray level image to receiving terminal.Due to JPEG codings
Image file size can be substantially reduced in the case where ensureing still image quality requirements, Bose-Chaudhuri-Hocquenghem Code, which has, very strong resists various make an uproar
Acoustic jamming and error correcting capability, both are combined, and can both reduce being hidden image data amount size, can strengthen anti-noise again
Acoustic energy power, finally causes gray level image to be difficult during binary hologram vehicle treated, hiding and transmission by noise
Interference, substantially increase the quality of the image of recovery.In holographic video system, method provided by the present invention is hidden
Image can be as digital watermarking, for protecting the copyright of hologram and discerning the false from the genuine；In fields, this hair such as military and secret communications
Bright provided method, is carrier, secreted transfering image information so that image transmitting is more using binary digit hologram
Safety；Meanwhile, on the basis of the present invention, more extraneous informations or function, Ke Yida are added in binary digit hologram
To increase information transfer bandwidth and the purpose of efficiency.
As the 3rd embodiment of the present invention, as shown in figure 4, the invention provides a kind of gray level image coding/decoding method,
This method includes：
Step S201：The binary hologram for hiding gray level image that receiving terminal receiving end/sending end is sent.
Step S202：The random number that receiving terminal is inputted according to user generates Substitution Rules, according to the Substitution Rules to two
Binary system greyscale image data string in system hologram is extracted.
Step S203：The binary system greyscale image data string of extraction is divided into several binary data small by receiving terminal
Piece, to this, several binary data small pieces carry out BCH decodings respectively, to obtain jpeg encoded data string.
Step S204：The binary data of jpeg encoded data string is converted into decimal data by receiving terminal, and is utilized
JPEG coding/decoding methods are decoded to the decimal data of the jpeg encoded data string, obtain hiding gray level image.
In summary, a kind of gray level image coding/decoding method that third embodiment of the invention is provided, receiving terminal according to
The random number of family input is extracted to the binary system greyscale image data string hidden in binary hologram, is solved using JPEG
Code and BCH decode the method being combined and carry out decoding process to hiding image, so as to recover hiding gray level image.Due to
Encoded using JPEG, coding/decoding method can substantially reduce image file size in the case where ensureing still image quality requirements, BCH is compiled
Code, coding/decoding method have it is very strong resist various noise jammings and error correcting capability, both are combined, and can both reduce quilt
Hide image data amount size, can strengthen noise resisting ability again, final that hiding image is difficult in binary hologram
Disturbed during vehicle treated, hiding and transmission by noise, substantially increase the quality of the image of recovery.
As the 4th embodiment of the present invention, as Figure 4-Figure 6, the invention provides a kind of gray level image decoding side
Method, this method includes：
Step S201：The binary hologram for hiding gray level image that receiving terminal receiving end/sending end is sent.
Step S202：The random number that receiving terminal is inputted according to user generates Substitution Rules, according to the Substitution Rules to two
Binary system greyscale image data string in system hologram is extracted.It should be noted that in this step user input with
Machine numerical value, should be consistent with the random number that transmission end subscriber is inputted when coding is hidden, and can generate and transmitting terminal pair
The Substitution Rules answered, so as to reach the purpose correctly extracted to binary system greyscale image data string.In the present embodiment, receiving terminal
There is the maker for randomly generating sequence, user is inputted after the random number consistent with transmitting terminal, randomly generates the maker of sequence
Substitution Rules are automatically generated according to the random number.
Step S203：The binary system greyscale image data string of extraction is divided into several binary data small by receiving terminal
Piece, to this, several binary data small pieces carry out BCH decodings respectively, to obtain jpeg encoded data string.
As shown in figure 5, step S203 comprises the following steps：
Step S203-1：The total information bit length of the Bose-Chaudhuri-Hocquenghem Code obtained when carrying out Bose-Chaudhuri-Hocquenghem Code using transmitting terminal, determines BCH
The total information bit length of decoding.
In the present embodiment, the total information bit length of Bose-Chaudhuri-Hocquenghem Code is equal with the total information bit length that BCH is decoded, receiving terminal
User need to learn the total information bit length of the Bose-Chaudhuri-Hocquenghem Code of transmitting terminal, it is then defeated in systems by way of being manually entered
Enter the total information bit length of the Bose-Chaudhuri-Hocquenghem Code.
Step S203-2：Binary system greyscale image data string is pressed as segmentation unit using the total information bit length that BCH is decoded
Several binary data small pieces are divided into successively according to vertical order.
Step S203-3：To this, several binary data small pieces carry out BCH decodings respectively, to obtain jpeg encoded data
String.
Step S204：The binary data of jpeg encoded data string is converted into decimal data by receiving terminal, and is utilized
JPEG coding/decoding methods are decoded to the decimal data of the jpeg encoded data string, obtain hiding gray level image.
As shown in fig. 6, step S204 comprises the following steps：
Step S204-1：The binary data of jpeg encoded data string is converted into decimal data.
Step S204-2：It is right according to the image fritter institute of 8*8 pixels one by one to the decimal data of jpeg encoded data string
The jpeg data string size answered is split successively, and lossless entropy is carried out respectively to several obtained lossless entropy code subdata strings
Decoding, obtains the non-uniform quantizing pixel value array of the discrete cosine transform corresponding to the image fritter of several 8*8 pixels.
It should be noted that in step S204-2, the rule of segmentation is unfixed, when the figure for detecting 8*8 pixels
When jpeg data string as corresponding to fritter reaches stop bits, then split.The image fritter institute for often detecting 8*8 pixels is right
The jpeg data string answered reaches stop bits, is once split, i.e., according to the JPEG corresponding to the image fritter of 8*8 pixels one by one
Serial data size is split successively.
Step S204-3：The non-uniform quantizing pixel value arrays of several discrete cosine transforms is carried out respectively non-homogeneous anti-
Quantification treatment, to obtain the discrete cosine transform pixel value array after several non-homogeneous inverse quantization processing.
Step S204-4：Discrete cosine transform pixel value array after several non-homogeneous inverse quantization processing is carried out respectively
Inverse discrete cosine transform, obtains the image fritter of several 8*8 pixels.
Step S204-5：The image fritter of several 8*8 pixels is combined, hiding gray level image is recovered.
In summary, a kind of gray level image coding/decoding method that four embodiment of the invention is provided, receiving terminal according to
The random number of family input is extracted to the binary system greyscale image data string hidden in binary hologram, is solved using JPEG
Code and BCH decode the method being combined and carry out decoding process to hiding binary system greyscale image data string, so as to recover hiding
Gray level image.Due to using JPEG codings, coding/decoding method image can be substantially reduced in the case where ensureing still image quality requirements
File size, Bose-Chaudhuri-Hocquenghem Code, coding/decoding method have it is very strong resist various noise jammings and error correcting capability, both mutually tie
Close, can both reduce and be hidden image data amount size, noise resisting ability can be strengthened again, it is final that hiding image is difficult
Disturbed during binary hologram vehicle treated, hiding and transmission by noise, substantially increase the image of recovery
Quality, be advantageously implemented safe and high-quality image concealing application.
As the 5th embodiment of the present invention, as shown in fig. 7, hiding dress the invention provides a kind of gray level image coding
Put, the device includes：
JPEG coding modules 101, for being encoded using JPEG coding methods to gray level image, obtain JPEG coded numbers
According to string, now, the serial data of the jpeg encoded data string is decimal data form；By the decimal system of the jpeg encoded data string
Data conversion is into binary data.
Bose-Chaudhuri-Hocquenghem Code module 102, for the binary data of above-mentioned jpeg encoded data string to be divided into several binary systems
Several binary data small pieces are carried out Bose-Chaudhuri-Hocquenghem Code by data small pieces respectively, and by several binary systems after Bose-Chaudhuri-Hocquenghem Code
Data small pieces combination producing binary system greyscale image data string successively.
Hidden module 103, the random number for being inputted according to user generates Substitution Rules, by the Substitution Rules, uses
State the binary system that every bit data in binary system greyscale image data string replaces correspondence position in preset binary hologram
Pixel value, to obtain concealing the binary hologram of gray level image.
Sending module 104, for the binary hologram for concealing gray level image to be sent to receiving terminal.
Further, as shown in figure 8, JPEG coding modules 101 include：
Image fritter segmentation module 101-1：Gray level image is divided into the image fritter of several 8*8 pixels by transmitting terminal.
Discrete cosine transform module 101-2：Discrete cosine change is carried out respectively to the 8*8 of several image fritters pixel value
Change, obtain discrete cosine transform pixel value.
Non-uniform quantizing processing module 101-3：The discrete cosine transform pixel value of several image fritters is carried out respectively
Non-uniform quantizing processing, obtains the discrete cosine transform pixel value after non-uniform quantizing processing.
Lossless entropy code module 101-4：To the discrete cosine transform pixel value difference after the processing of several non-uniform quantizings
Lossless entropy code is carried out, is obtained after several lossless entropy code subdata strings, is combined according to the segmentation order of image fritter,
Form jpeg encoded data string.
Decimal system conversion binary module 101-5：The decimal data of jpeg encoded data string is converted into binary number
According to.
Further, as shown in figure 9, Bose-Chaudhuri-Hocquenghem Code module 102 includes：
Code division rule generation module 102-1, the error correcting capability for determining Bose-Chaudhuri-Hocquenghem Code according to default noise intensity,
The total information bit length for obtaining Bose-Chaudhuri-Hocquenghem Code is calculated using the error correcting capability of Bose-Chaudhuri-Hocquenghem Code.It should be noted that the default noise is strong
Degree is usually the maximum noise predicted and might have in transmit process, and the intensity settings by the maximum noise of the prediction are default
Noise intensity so that error correcting capability must can be all due to error correcting caused by influence of noise, so can be with
Ensure that hiding gray level image can be recovered.
In the present embodiment, by formula n=2m- 1 (m >=3, m ∈ Z) and formula n-k≤m (t ＜ m/2) determine Bose-Chaudhuri-Hocquenghem Code
Error correcting capability t, according to the error correcting capability t of Bose-Chaudhuri-Hocquenghem Code calculate obtain information bit length k, according to information bit length k calculate obtain
The total information length n of Bose-Chaudhuri-Hocquenghem Code, wherein, m is the non-zero positive integer determined according to practical situations, and Z represents non-zero just
Integer set.The user of transmitting terminal needs to inform the total information length n of the Bose-Chaudhuri-Hocquenghem Code into the user of receiving terminal, to ensure to receive
Hold and the operation corresponding with transmitting terminal is carried out in units of same total information length n.
Binary data small pieces code division module 102-2, for single by segmentation of the total information bit length of the Bose-Chaudhuri-Hocquenghem Code
Position, is divided into several binary data small the binary data of jpeg encoded data string successively according to vertical order
Piece.
Binary system greyscale image data string generation module 102-3, enters respectively for several binary data small pieces to this
Row Bose-Chaudhuri-Hocquenghem Code, and by several binary data small pieces after Bose-Chaudhuri-Hocquenghem Code successively combination producing binary system greyscale image data
String.
In summary, a kind of gray level image coding concealing device that fifth embodiment of the invention is provided, utilizes JPEG
The method that coding and Bose-Chaudhuri-Hocquenghem Code are combined carries out coded treatment to image to be concealed, and the image concealing after coded treatment is arrived
In binary hologram, transmitting terminal sends the binary hologram for concealing gray level image to receiving terminal.Due to JPEG codings
Module can substantially reduce image file size in the case where ensureing still image quality requirements, and Bose-Chaudhuri-Hocquenghem Code module has very strong support
Various noise jammings and error correcting capability are driven, both are combined, and can both reduce being hidden image data amount size, again can be with
Strengthen noise resisting ability, finally cause gray level image to be difficult during binary hologram vehicle treated, hiding and transmission
Disturbed by noise, substantially increase the quality of the gray level image of recovery.
As the present invention the 6th embodiment, as shown in Figure 10, the invention provides a kind of gray level image decoding apparatus,
The device includes：
Receiving module 201, the binary hologram for hiding gray level image sent for receiving end/sending end.
Hidden image extraction module 202, the random number for being inputted according to user generates Substitution Rules, according to the replacement
Rule is extracted to the binary system greyscale image data string in binary hologram.It should be noted that user in this step
The random number of input, should with to send end subscriber random number for inputting when coding is hidden consistent, can generate and
The corresponding Substitution Rules of transmitting terminal, so as to reach the purpose correctly extracted to binary system greyscale image data string.In the present embodiment
In, receiving terminal has the maker for randomly generating sequence, and user is inputted after the random number consistent with transmitting terminal, randomly generates sequence
Maker Substitution Rules are automatically generated according to the random number.
BCH decoder modules 203, for the binary system greyscale image data string of extraction to be divided into several binary data
Small pieces, to this, several binary data small pieces carry out BCH decodings respectively, to obtain jpeg encoded data string.Now, the JPEG
The serial data of coded data string is binary data format.
JPEG decoder modules 204, for the binary data of jpeg encoded data string to be converted into decimal data, and profit
The decimal data of the jpeg encoded data string is decoded with JPEG coding/decoding methods, hiding gray level image is obtained.
Further, as shown in figure 11, BCH decoder modules 203 include：
Decoding segmentation rule generation module 203-1, the Bose-Chaudhuri-Hocquenghem Code obtained during for carrying out Bose-Chaudhuri-Hocquenghem Code using transmitting terminal
Total information bit length, determines the total information bit length of BCH decodings.In the present embodiment, the total information bit length of Bose-Chaudhuri-Hocquenghem Code with
The total information bit length of BCH decodings is equal, and the user of receiving terminal needs to learn the total information bit length of the Bose-Chaudhuri-Hocquenghem Code of transmitting terminal,
Then the total information bit length of the Bose-Chaudhuri-Hocquenghem Code is inputted in systems by way of being manually entered.
Binary data small pieces decoding segmentation module 203-2, for the total information bit length that is decoded using BCH to split unit
Binary system greyscale image data string is divided into several binary data small pieces successively according to vertical order.
Jpeg encoded data string generation module 203-3, BCH solutions are carried out for several binary data small pieces to this respectively
Code, to obtain jpeg encoded data string.
Further, as shown in figure 12, JPEG decoder modules 204 include：
Binary Conversion decimal system module 204-1：Enter for the binary data of jpeg encoded data string to be converted into ten
Data processed.
Lossless entropy decoder module 204-2：For the decimal data to jpeg encoded data string according to 8*8 pixels one by one
Jpeg data string size corresponding to image fritter is split successively, to obtained several lossless entropy code subdata strings point
Lossless entropy decoding is not carried out, obtains the non-uniform quantizing of the discrete cosine transform corresponding to the image fritter of several 8*8 pixels
Pixel value array.
It should be noted that when lossless entropy decoder module 204-2 is split to jpeg encoded data string, the rule of segmentation
It is unfixed, when the jpeg data string corresponding to the image fritter for detecting 8*8 pixels reaches stop bits, is then divided
Cut.Often detect jpeg data string corresponding to the image fritter of 8*8 pixels and reach stop bits, once split, i.e., according to
The jpeg data string size corresponding to the image fritter of 8*8 pixels is split successively one by one.
Non-homogeneous inverse quantization processing module 204-3：For the non-uniform quantizing pixel value to several discrete cosine transforms
Array carries out non-homogeneous inverse quantization processing respectively, to obtain the discrete cosine transform pixel after several non-homogeneous inverse quantization processing
It is worth array.
Discrete cosine inverse transform module 204-4：For to the discrete cosine transform after several non-homogeneous inverse quantization processing
Pixel value array carries out inverse discrete cosine transform respectively, obtains the image fritter of several 8*8 pixels.
Image fritter composite module 204-5：For by the image fritter combination of several 8*8 pixels, recovering hiding
Gray level image.
In summary, a kind of gray level image decoding apparatus that sixth embodiment of the invention is provided, receiving terminal according to
The random number of family input is extracted to the binary system greyscale image data string hidden in binary hologram, is solved using JPEG
Code module and BCH decoder modules are combined, and decoding process are carried out to hiding image, so as to recover hiding gray level image.By
In that can substantially reduce image file size in the case where ensureing still image quality requirements using JPEG codings, coding/decoding method, BCH is compiled
Code, coding/decoding method have it is very strong resist various noise jammings and error correcting capability, both are combined, and can both reduce quilt
Hide image data amount size, can strengthen noise resisting ability again, final that hiding image is difficult in binary hologram
Disturbed during vehicle treated, hiding and transmission by noise, substantially increase the quality of the image of recovery, be conducive to reality
Now safety and high-quality image concealing application.
As the 7th embodiment of the present invention, as shown in figure 13, the invention provides a kind of gray level image hidden method.
Original gray level image is divided into the image fritter of several 8*8 pixels by transmitting terminal, then to several image fritters according to
Secondary progress discrete cosine transform, non-uniform quantizing, lossless entropy code, Bose-Chaudhuri-Hocquenghem Code processing, obtain several binary data small
Piece, the binary data small pieces generate binary system greyscale image data string after combining successively, and the binary data string is inserted into
In one binary hologram, i.e., original-gray image is hidden into binary hologram；This original ash has been concealed into
The binary hologram of degree image is sent to receiving terminal；Receiving terminal extracts binary system greyscale image data string therein, and two are entered
Greyscale image data string processed is divided into several binary data small pieces, and then several binary data small pieces are carried out successively
BCH decodings, lossless entropy decoding, non-homogeneous inverse quantization, inverse discrete cosine transform, by the image fritter of several obtained 8* pixels
Combination, finally gives the gray level image of recovery.
In summary, a kind of gray level image hidden method that seventh embodiment of the invention is provided, is encoded using JPEG
The method being combined with Bose-Chaudhuri-Hocquenghem Code carries out coded treatment to image to be concealed, and the image concealing after coded treatment is entered to two
In hologram processed, transmitting terminal sends the binary hologram for concealing gray level image to receiving terminal, and receiving terminal carries out corresponding
Decoding process.Because JPEG codings can substantially reduce image file size, Bose-Chaudhuri-Hocquenghem Code in the case where ensureing still image quality requirements
Have it is very strong resist various noise jammings and error correcting capability, both are combined, and can both reduce being hidden view data
Measure size, noise resisting ability can be strengthened again, finally cause gray level image be difficult binary hologram vehicle treated, hide and
Disturbed during transmission by noise, substantially increase the quality of the image of recovery.In holographic video system, the present invention
The method provided, being hidden image can be as digital watermarking, for protecting the copyright of hologram and discerning the false from the genuine；Military and
The fields such as secret communication, method provided by the present invention is carrier, secreted transfering image letter using binary digit hologram
Breath so that image transmitting is safer；Meanwhile, on the basis of the present invention, more volumes are added in binary digit hologram
External information or function, can reach the purpose of increase information transfer bandwidth and efficiency.
The foregoing is merely illustrative of the preferred embodiments of the present invention, not to limit invention, all spirit in the present invention
With any modifications, equivalent substitutions and improvements made within principle etc., it should be included in the scope of the protection.
Claims (10)
1. a kind of gray level image encodes hidden method, it is characterised in that methods described includes：
Transmitting terminal is encoded using JPEG coding methods to gray level image, obtains jpeg encoded data string, and by the JPEG
The decimal data of coded data string is converted into binary data；
The binary data of the jpeg encoded data string is divided into several binary data small pieces by the transmitting terminal, to institute
State several binary data small pieces and carry out Bose-Chaudhuri-Hocquenghem Code respectively, and by several binary data small pieces after Bose-Chaudhuri-Hocquenghem Code successively
Combination producing binary system greyscale image data string；
The random number that the transmitting terminal is inputted according to user generates Substitution Rules, according to the Substitution Rules, is entered with described two
Every bit data in greyscale image data string processed replaces the binary pixel values of correspondence position in preset binary hologram,
To obtain concealing the binary hologram of gray level image；
The transmitting terminal sends the binary hologram for concealing gray level image to receiving terminal.
2. the method as described in claim 1, it is characterised in that the transmitting terminal is entered using JPEG coding methods to gray level image
Row coding, obtaining jpeg encoded data string includes：
The gray level image is divided into the image fritter of several 8*8 pixels by the transmitting terminal；
Discrete cosine transform is carried out respectively to the 8*8 of several described image fritters pixel value, discrete cosine transform picture is obtained
Element value；
Non-uniform quantizing processing is carried out respectively to the discrete cosine transform pixel value of several described image fritters, obtains non-homogeneous
Discrete cosine transform pixel value after quantification treatment；
Lossless entropy code is carried out respectively to the discrete cosine transform pixel value after non-uniform quantizing processing several described, if obtaining
After dry lossless entropy code subdata string, it is combined according to the segmentation order of described image fritter, forms jpeg encoded data
String.
3. the method as described in claim 1, it is characterised in that the transmitting terminal is by the binary system of the jpeg encoded data string
Data are divided into several binary data small pieces to include：
The error correcting capability of Bose-Chaudhuri-Hocquenghem Code is determined according to default noise intensity, is calculated and obtained using the error correcting capability of the Bose-Chaudhuri-Hocquenghem Code
The total information bit length of Bose-Chaudhuri-Hocquenghem Code；
The binary data of the lossless entropy code serial data is pressed by segmentation unit of the total information bit length of the Bose-Chaudhuri-Hocquenghem Code
Several binary data small pieces are divided into successively according to vertical order.
4. a kind of gray level image coding/decoding method, it is characterised in that methods described includes：
The binary hologram for hiding gray level image that receiving terminal receiving end/sending end is sent；
The random number that the receiving terminal is inputted according to user generates Substitution Rules, according to the Substitution Rules to the binary system
Binary system greyscale image data string in hologram is extracted；
The binary system greyscale image data string of extraction is divided into several binary data small pieces by the receiving terminal, to institute
State several binary data small pieces and carry out BCH decodings respectively, to obtain jpeg encoded data string；
The binary data of the jpeg encoded data string is converted into decimal data by the receiving terminal, and utilizes JPEG decodings
Method is decoded to the decimal data of the jpeg encoded data string, obtains hiding gray level image.
5. method as claimed in claim 4, it is characterised in that the receiving terminal is by the binary system gray level image number of extraction
It is divided into several binary data small pieces to include according to string：
The total information bit length of the Bose-Chaudhuri-Hocquenghem Code obtained when carrying out Bose-Chaudhuri-Hocquenghem Code using transmitting terminal, determines the total information position of BCH decodings
Length；
The binary system greyscale image data string is arrived according to the past as segmentation unit using the total information bit length that the BCH is decoded
Order afterwards is divided into several binary data small pieces successively.
6. method as claimed in claim 4, it is characterised in that the utilization JPEG coding/decoding methods are to the jpeg encoded data
The decimal data of string is decoded, and obtaining hiding gray level image includes：
The jpeg encoded data string is entered successively according to the jpeg data string size corresponding to the image fritter of 8*8 pixels one by one
Several obtained lossless entropy code subdata strings are carried out lossless entropy decoding, obtain several 8*8 pixels by row segmentation respectively
The non-uniform quantizing pixel value array of discrete cosine transform corresponding to image fritter；
Non-uniform quantizing pixel value array to discrete cosine transform several described carries out non-homogeneous inverse quantization processing respectively, with
Obtain the discrete cosine transform pixel value array after several non-homogeneous inverse quantization processing；
Discrete cosine inverse is carried out respectively to the discrete cosine transform pixel value array after non-homogeneous inverse quantization processing several described
Conversion, obtains the image fritter of several 8*8 pixels；
The image fritter of several 8*8 pixels is combined, hiding gray level image is recovered.
7. a kind of gray level image encodes concealing device, it is characterised in that described device includes：
JPEG coding modules, for being encoded using JPEG coding methods to gray level image, obtain jpeg encoded data string, and
The decimal data of the jpeg encoded data string is converted into binary data；
Bose-Chaudhuri-Hocquenghem Code module, for being divided into several binary data small the binary data of the jpeg encoded data string
Several described binary data small pieces are carried out Bose-Chaudhuri-Hocquenghem Code by piece respectively, and by several binary data after Bose-Chaudhuri-Hocquenghem Code
Small pieces combination producing binary system greyscale image data string successively；
Hidden module, the random number for being inputted according to user generates Substitution Rules, according to the Substitution Rules, with described two
Every bit data in system greyscale image data string replaces the binary system pixel of correspondence position in preset binary hologram
Value, to obtain concealing the binary hologram of gray level image；
Sending module, for the binary hologram for concealing gray level image to be sent to receiving terminal.
8. device as claimed in claim 7, it is characterised in that the Bose-Chaudhuri-Hocquenghem Code module includes：
Code division rule generation module, the error correcting capability for determining Bose-Chaudhuri-Hocquenghem Code according to default noise intensity, using described
The error correcting capability of Bose-Chaudhuri-Hocquenghem Code calculates the total information bit length for obtaining Bose-Chaudhuri-Hocquenghem Code；
Binary data small pieces code division module, for using the total information bit length of the Bose-Chaudhuri-Hocquenghem Code be segmentation unit by institute
The binary data for stating jpeg encoded data string is divided into several binary data small pieces successively according to vertical order；
Binary system greyscale image data string generation module, for carrying out BCH volumes respectively to several described binary data small pieces
Code, and by several binary data small pieces after Bose-Chaudhuri-Hocquenghem Code successively combination producing binary system greyscale image data string.
9. a kind of gray level image decoding apparatus, it is characterised in that described device includes：
Receiving module, the binary hologram for hiding gray level image sent for receiving end/sending end；
Hidden image extraction module, the random number for being inputted according to user generates Substitution Rules, according to the Substitution Rules
Binary system greyscale image data string in the binary hologram is extracted；
BCH decoder modules, for being divided into several binary data small the binary system greyscale image data string of extraction
Several described binary data small pieces are carried out BCH decodings, to obtain jpeg encoded data string by piece respectively；
JPEG decoder modules, for the binary data of the jpeg encoded data string to be converted into decimal data, and are utilized
JPEG coding/decoding methods are decoded to the decimal data of the jpeg encoded data string, obtain hiding gray level image.
10. device as claimed in claim 9, it is characterised in that the BCH decoder modules include：
Decoding segmentation rule generation module, the total information bit length of the Bose-Chaudhuri-Hocquenghem Code obtained during for carrying out Bose-Chaudhuri-Hocquenghem Code using transmitting terminal
Degree, determines the total information bit length of BCH decodings；
Binary data small pieces decoding segmentation module, for the total information bit length that decode using the BCH to split unit by institute
State binary system greyscale image data string and be divided into several binary data small pieces successively according to vertical order；
Jpeg encoded data string generation module, for carrying out BCH decodings respectively to several described binary data small pieces, with
To jpeg encoded data string.
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