CN103796024B - Method for transmitting multiple paths of images at the same time based on information hiding - Google Patents
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Abstract
The invention discloses a method for transmitting multiple paths of images at the same time based on information hiding. The method for transmitting the multiple paths of images at the same time based on information hiding comprises the steps that the multiple paths of images are compressed respectively according to a specified compression ratio, one path of image which is closest to an index is selected, compression ratios are distributed to the other paths of images automatically according to objective evaluation indexes of the images, and the other paths of images are compressed at the same time according to the distributed compression ratios, wherein the compression ratios are always larger than the compression ratio of the first path of image; relevant compression information of the multiple paths of images is extracted and is hidden in the first path of image, then compression is conducted according to the specified compression ratio, the formats of the data of the images with different compression ratios are unified, the data of the images are then transmitted by several paths, the number of the paths of data transmission is not larger than the number of the paths of the images, and the overall transmission rate is reduced obviously. According to the method for transmitting the multiple paths of images at the same time based on information hiding, by means of the difference of the compression performance of the multiple paths of images, the compression ratios are distributed in a self-adaptive mode, the defects of a conventional technique for transmitting multiple paths of images are overcome, and on the premise that the quality of the multiple paths of images meets requirements, the actual compression ratio can be improved all the time, and pressure of a data transmission system is reduced.
Description
Technical field
The present invention relates to a kind of multiway images simultaneous transmission method based on Information hiding, more particularly to a kind of compression of images
The method of transmission, belongs to data communication technology field.
Background technology
Data transfer and image procossing are the important subjects of the current communications field.With the development of technology, sensor
Quantity is continuously increased, and the image of acquisition is not only single channel image, and including multiway images perhaps, such as multispectral image, ultraphotic spectrum
Image has multiway images perhaps to transmit, it is seen that light image also has multiplex problem.
The method mostly Shi Ge roads that at present multiway images are transmitted are transmitted respectively, lack effective Combined Treatment transmission side
Method.Multiway images are processed using single channel image processing method, efficiency of transmission is not high, and transmission quality is not high.Conventional multiplexing
Method cannot meet our efficient data transfer requirement.In the urgent need to the new technology of multiway images transmission in engineering.More preferably, more
Effectively carry out multiway images simultaneous transmission and there is important theory significance and practical value.
At present, multiway images data transmission method in the world, problem is as follows：
1）Transmit respectively in the majority, do not play the advantage of multiway images；
2）Multiway images data transmission method is based on conventional multichannel multiplexing method, and the process before transmission is inadequate；
3）Pretreatment is inefficient before transmission；
4）The compression method that transmission is adopted is relatively simple, bad with Image Feature Matching；
5）Transmission post processing means lack；.
6）Not yet have based on the multiway images simultaneous transmission method of Information hiding.
Information Hiding Techniques are to we provide a new way.For this purpose, we intend proposing based on the multichannel of Information hiding
The method of image simultaneous transmission.
Current image data compression method has many, representational to have JPEG and JPEG2000.Because compression standard is calculated
Method function is relatively more, and algorithm is relevant with image self character, is not all to be for the best in what situations, different images compression effectiveness
Difference is especially big, that is to say, that as 4 times of effects of 16 times of effects of the compression of images having and the compression of images having, and traditional multichannel is passed
The each road compression ratio of transmission method is the same, such as satellite high-speed digital transmission system.How figure is further reduced in the case where performance is good
The speed of picture data transfer is very meaningful.The compression method that general high speed data transmission system is adopted mostly is have damage method,
For image, general Y-PSNR（PSNR）More than 30dB, more than 35dB effect is just more satisfactory.
The content of the invention
The present invention technology solve problem be：Overcome the deficiencies in the prior art, there is provided a kind of multichannel based on Information hiding
Image simultaneous transmission method, the present invention solves the problems such as conventional multiple image transfer method efficiency of transmission is low, laser propagation effect is bad.
The present invention technical solution be：
A kind of multiway images simultaneous transmission method based on Information hiding includes that step is as follows：
（1）Objective indicator P1, P2 of calculating n roads compression of images r times ... ..Pn, and minimum objective indicator is chosen for P1's
Image；
（2）According to step（1）Calculated objective indicator P1, P2 ... ..Pn, automatically distribution compression ratio r2, r3 ...
..rn, wherein r2, r3 ... ..rn is all higher than r；
（3）To step（1）In other each road images outside the corresponding image of minimum objective indicator P1 compress respectively r2,
R3 ... ..rn times obtains n-1 circuit-switched data collection；
（4）Recording step（3）The information of middle n-1 roads image, forms compression relevant information S；The letter of described n-1 roads image
Breath includes compression algorithm version number, picture numbers, compression ratio, objective indicator, the length of n roads compressed data set and mark；
（5）By step（4）In compression relevant information S hide in the corresponding image of embedded minimum objective indicator P1, will be hidden
Compression of images r times for keeping relevant information S obtains first via data set, and adds；
（6）To step（3）In n-1 circuit-switched datas collection and step（5）In first via data set carry out unifying in order compiling
Row is processed, and obtains compressed data stream；
（7）To step（6）In compressed data stream encoded, be divided into L roads transmitting data stream and transmit, wherein L is less than
n；
（8）Receiving terminal receives L roads transmitting data stream, extracts n circuit-switched data collection, and it is hidden to enter row information to first via data set
Hide inversely processing to obtain compressing relevant information and the corresponding image of minimum objective indicator P1；
（9）N-1 roads image information is decompressed according to compression relevant information, recovery obtains n-1 roads and recovers image.
The step（2）It is middle according to objective indicator P1, P2 ... ..Pn distribute automatically compression ratio r2, r3 ... ..rn methods are such as
Under：
If objective indicator Pk G1dB higher than objective indicator P1, the compression ratio R=1.5r of Pk correspondence images is set；Wherein k=
2、3、…..n；
If objective indicator Pk G2dB higher than objective indicator P1, the compression ratio R=2r of Pk correspondence images is set；
If objective indicator Pk G3dB higher than objective indicator P1, the compression ratio R=4r of Pk correspondence images is set；
If objective indicator Pk 0.5-1dB higher than objective indicator P1, the compression ratio R=r of Pk correspondence images is set；Wherein G3
More than G2, G2 is more than G1.
Described G3 is 8-12dB；G2 is 4-6dB；G1 is 2-4dB.
The step（4）Compression relevant information is hidden and step（8）Information adopts robust steganography side against hidden method
Method.
The step（7）Middle compressed data stream is divided into the method for L roads transmission data and is divided into two kinds：
（a）By compressed data stream according to streaming rate average out to L roads；
（b）Compressed data stream L roads are not divided into into according to streaming rate.
Compared with the prior art, the invention has the advantages that：
（1）The present invention carries out the compression of regulation compression ratio to every width original image first, while taking full advantage of different spies
Property image compression ratio it is different the characteristics of, by combining compression, while make use of " redundancy " of picture quality, solve data high
Effect transmission problem, " the luxurious index " of single image compression effectiveness unified utilization is brought, and improves multiway images reduced overall
Effect.
（2）The present invention by the way that compression relevant information is hidden in the image for reaching the set quota, the image compression rate
Minimum, is conducive to information concealing method to play optimum efficiency.
（3）The present invention is hidden the little part of necessary relevant information, carrier image is not almost affected, significantly
The resistance to compression of hidden method and the Quality of recovery of carrier image are improve, the efficiency of compression of images and transmission is improve.
（4）The present invention, as the first consideration, improves transmission compression ratio using user's request, substantially increases use value,
In transmission simultaneously, multichannel relevant information has been grasped, has been provided users with the convenient.
（5）Present invention achieves 1 tunnel speed is fixed, in addition n-1 speed stepping fixes adaptive change, while the present invention is real
Show n roads fixed rate and be converted to L roads fixed rate, improve compression ratio, shortened transmission time, reduce bit rate.
Description of the drawings
Fig. 1 is flow chart of the present invention.
Specific embodiment
The specific embodiment of the present invention is further described in detail below in conjunction with the accompanying drawings.
The present invention will be passed based on Information Hiding Techniques in the embedded view data all the way of multiway images data association message
Defeated, ground receiver end can correctly extract related data from carrier image, and on request quality recovers original remote sensing images
Data.In the case where picture quality and non-change data compression method is not reduced simultaneously, there is provided the biography that a kind of multichannel is compressed
Transmission method.Using the actual compression ratio that improve Data transfer system of the method for the present invention, the Quality of recovery of carrier image is improve.
As shown in figure 1, step of the present invention is as follows：
A kind of multiway images simultaneous transmission method based on Information hiding includes that step is as follows：
（1）Objective indicator P1, P2 of calculating n roads compression of images r times ... ..Pn, and minimum objective indicator is chosen for P1's
Image（P1, P2 ... ..Pn indexs are equal to or higher than objective indicator P of user's request)；
（2）According to step（1）Calculated objective indicator P1, P2 ... ..Pn, automatically distribution compression ratio r2, r3 ...
..rn, wherein r2, r3 ... ..rn is all higher than r；
If objective indicator Pk（Such as PSNR）G1dB higher than objective indicator P1, then arrange the compression ratio R=of Pk correspondence images
1.5r；Wherein k=2,3 ... ..n；
If objective indicator Pk（Such as PSNR）G2dB higher than objective indicator P1, then arrange the compression ratio R=2 of Pk correspondence images
R；
If objective indicator Pk（Such as PSNR）G3dB higher than objective indicator P1, then arrange the compression ratio R=4 of Pk correspondence images
R；
If objective indicator Pk（Such as PSNR）0.5-1dB higher than objective indicator P1, then arrange the compression ratio R of Pk correspondence images
=r；Wherein G3 is more than G2, and G2 is more than G1.
G3 is 8-12dB；G2 is 4-6dB；G1 is 2-4dB.
（3）To step（1）In other each road images outside the corresponding image of minimum objective indicator P1 compress respectively r2,
R3 ... ..rn times obtains n-1 circuit-switched data collection；
（4）Recording step（3）The information of middle n-1 roads image, forms compression relevant information S；The letter of described n-1 roads image
Breath includes compression algorithm version number, picture numbers, compression ratio（Such as compression ratio r2, r3 ... ..rn）, objective indicator, n roads compression
The length and mark of data set；
（5）By step（4）In compression relevant information S hide in the corresponding image of embedded minimum objective indicator P1, will be hidden
Compression of images r times for keeping relevant information S obtains first via data set；Compression relevant information is hidden and adopts robust steganography side
Method
（6）To step（3）In n-1 circuit-switched datas collection and step（5）In first via data set in order（According to way
Arrangement sequence number 1,2,3 ... ..n）Carry out unifying layout process, obtain compressed data stream；
（7）To step（6）In compressed data stream encoded（Coding before being transmitted, for example, carry out channel volume
Code）, it is divided into L roads transmitting data stream and transmits, wherein L is not less than n；
Compressed data stream is divided into the method for L roads transmission data and is divided into two kinds：
（a）By compressed data stream according to streaming rate average out to L roads；
（b）Compressed data stream L roads are not divided into into according to streaming rate.
For example：1st circuit-switched data and the 2nd tunnel are compressed respectively according to compression ratio r and r2, and the rear speed of compression is respectively V1
And V2, if according to the method described in (a), compressed data stream speed is the average of V1 and V2, and compressed data stream is according to average
Number is divided into two-way；If according to（b）Described in method, compressed data stream according to V1 and V2 be respectively two-way distribution data, as
Decile does not distribute data.
（8）Receiving terminal receives L roads transmitting data stream, extracts n circuit-switched data collection, and it is hidden to enter row information to first via data set
Hide inversely processing to obtain compressing relevant information and the corresponding image of minimum objective indicator P1；Information adopts robust information against hidden method
Hidden method
（9）N-1 roads image information is decompressed according to compression relevant information, recovery obtains n-1 roads and recovers image.
Step（4）Compression relevant information is hidden and step（8）Information adopts robust steganography method against hidden method.
Below with the operation principle and the course of work of a specific embodiment explanation present invention：
In order to verify set forth herein algorithm performance, experiment employ n (4) width size be 512 × 512 8 bit greys
Degree image is emulated.The change degree of image is represented with Y-PSNR (PSNR).
Such as n=4, r=4, r2=8, r3=16, r4=16, Rt=4/ [1/4+1/8+1/16+1/16]=8.
Respectively 4 times of 4 tunnel compression of images, 8 times, 16 times, 16 times, the data after compression are respectively obtained, these data are by suitable
Sequence is arranged, and forms the packet of a regular length, and the data volume of the bag is the 1/8 of four width images.Equivalent to total data compression
8 times, and picture quality keeps 4 times of compression effectiveness.
Multiway images data transmission technology has been widely used for the spacecrafts such as remote sensing satellite, space probe and all kinds of defends
Star Data transfer system, broader applications will be obtained from now on.But traditional application process effect on driving birds is not good.The invention provides one kind exists
Multiplex method is carried out on the basis of existing Data transfer system data compression method, based on Information Hiding Techniques, the method has
The high efficiency feature and bigger compression ratio of distinctness, while the method has does not change original compression method and compression device, energy
Adaptively changing compression ratio, realizes that resource occupation is few, the characteristics of hide the practicality such as self adaptation, is easy to manufacture and use, so as to
It is more with practical value in spacecraft engineering.
The content not being described in detail in description of the invention belongs to the known technology of those skilled in the art.
Claims (4)
1. a kind of multiway images simultaneous transmission method based on Information hiding, it is characterised in that step is as follows：
(1) calculate n roads compression of images r times objective indicator P1, P2 ..., Pn, and choose image of the minimum objective indicator for P1；
(2) according to calculated objective indicator P1, P2 of step (1) ..., Pn, automatically distribution compression ratio r2, r3 ..., rn, its
Middle r2, r3 ..., rn be all higher than r；
(3) other each road images outside the corresponding image of minimum objective indicator P1 in step (1) are compressed respectively r2,
R3 ... ..rn times obtains n-1 circuit-switched data collection；
(4) in recording step (3) n-1 roads image information, formed compression relevant information S；The packet of described n-1 roads image
Include compression algorithm version number, picture numbers, compression ratio, objective indicator, the length of n roads compressed data set and mark；
(5) compression relevant information S in step (4) is hidden in the corresponding image of embedded minimum objective indicator P1, will be concealed with
Compression of images r times of relevant information S obtains first via data set；
(6) first via data set in the n-1 circuit-switched datas collection in step (3) and step (5) is carried out unifying at layout in order
Reason, obtains compressed data stream；
(7) compressed data stream in step (6) is encoded, is divided into L roads transmitting data stream and transmits, wherein L is less than n；
(8) receiving terminal receives L roads transmitting data stream, extracts n circuit-switched data collection, and it is inverse to carry out Information hiding to first via data set
Process obtains compressing relevant information and the corresponding image of minimum objective indicator P1；
(9) n-1 roads image information is decompressed according to compression relevant information, recovery obtains n-1 roads and recovers image.
2. a kind of multiway images simultaneous transmission method based on Information hiding according to claim 1, it is characterised in that：Institute
State in step (2) according to objective indicator P1, P2 ..., Pn distribute automatically compression ratio r2, r3 ..., rn methods it is as follows：
If objective indicator Pk G1dB higher than objective indicator P1, the compression ratio R=1.5r of Pk correspondence images is set；Wherein k=2,
3、…..n；
If objective indicator Pk G2dB higher than objective indicator P1, the compression ratio R=2r of Pk correspondence images is set；
If objective indicator Pk G3dB higher than objective indicator P1, the compression ratio R=4r of Pk correspondence images is set；
If objective indicator Pk 0.5-1dB higher than objective indicator P1, the compression ratio R=r of Pk correspondence images is set；Wherein G3 is more than
G2, G2 are more than G1；Described G3 is 8～12dB；G2 is 4～6dB；G1 is 2～4dB.
3. a kind of multiway images simultaneous transmission method based on Information hiding according to claim 1, it is characterised in that：Institute
State step (5) compression relevant information to hide with step (8) information against hidden method using robust steganography method, for ensureing
Information can be recovered after compressed and decompressed.
4. a kind of multiway images simultaneous transmission method based on Information hiding according to claim 1, it is characterised in that：Institute
State compressed data stream in step (7) and be divided into the method for L roads transmission data and be divided into two kinds：
A () is by compressed data stream according to streaming rate average out to L roads；
B compressed data stream is not divided into L roads by () according to streaming rate.
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