CN104065976B - A kind of compression of images and security transmission method based on video - Google Patents
A kind of compression of images and security transmission method based on video Download PDFInfo
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Abstract
A kind of compression of images and security transmission method based on video of the present invention, is compressed using video encoding standard after rest image is decomposed into little image sequence, and the coding for rest image provides a kind of new approach.The compression ratio of rest image is not only further increased, and the occasion in only video equipment remains to the coding for completing image.Experiment shows that with respect to JPEG compression standard, compression ratio can improve 31% to the application method of the present invention, and PSNR can obtain the high-gain of 5.5dB in the case where compression ratio is suitable.Meanwhile, the present invention can complete to encrypt in the case where compression performance and visual effect is not affected, with higher safety.
Description
Technical field
The present invention relates to a kind of method of Image Communication, more particularly to a kind of compression of images and security transmission method be
System, belongs to communication (such as data communication technology etc.) field.
Background technology
In the current information age, the 80% information people for emerging in large numbers need the media format by forms such as image, videos
To know.In order to save bandwidth, need before transmission to encode image and video, the image encoding standards that for example commonly uses have
JPEG etc., and video then commonly use H.264, the coding standard such as MPEG-2, MPEG-4.JPEG is formulated in 1991, as static map
As compression standard, obtain extensively and successfully applying in digital image arts；And H.264 it is a kind of newer of ITU-T propositions
The video image compression standard towards very low bit-rate video communication applications, wherein employ estimation, Integer DCT Transform,
The technology such as variable step size quantifies, variable entropy coding, obtain efficient video coding performance.Video and the coding standard of image
All achieve preferable effect and be widely used, but current research and application are all because the difference of two kinds of media formats
Different and employ different coded systems, i.e., video is compressed with video encoding standard, image is compressed with image encoding standards.
The coding file of consolidation form if coded image can be carried out using video encoding standard, can not only be obtained, rest image pressure is improved
The compression ratio of contracting standard JPEG, and rest image can also be encoded under the occasion of only video encoder.
Content of the invention
Present invention solves the technical problem that being：Overcome the deficiencies in the prior art, it is proposed that a kind of image pressure based on video
Contracting and security transmission method, improve JPEG compression standard compression ratio and Still Image Transmission when safety.
The technical scheme is that：A kind of compression of images and security transmission method based on video, step are as follows：
1) the original image X by size for M1 × N1 is adjusted to size for M × N's according to standard video image size K × L
Image A, to adjustment after image A extracted and formed image sequence A1, A2 ... .., An；Wherein, each little image A1,
A2 ... the size of .., An is K × L；Described M, N can be divided exactly by K, L respectively；
2) according to putting in order of making an appointment of transmitting-receiving two-end by image sequence A1, A2 ... .., An are obtained from new sort
New image sequence B1, B2 ... .., Bn, and the numbering that puts in order of the agreement is designated as h；
3) size M1, N1 of original image X and sequencing numbers h are embedded into step 2) the middle little image sequence for being formed
B1, B2 ... in .., Bn, formed stego-image sequence C 1, C2 ... .., Cn；
4) by stego-image sequence C 1, C2 ... .., Cn are compressed according to standard video coder method；
Stego-image sequence C 1, C2 after 5) receiving terminal is restored after standard video decoding ... .., Cn；
6) from stego-image sequence C 1, C2 ... extract embedded information M1, N1, h in .., Cn, original so as to obtain
The size of image X and the value of sequencing numbers h, so be restored little image sequence B1, B2 ... .., Bn；
7) according to sequencing numbers h by B1, B2 ... .., Bn revert to little image sequence A1, A2 ... .., An；
8) by little image sequence A1, A2 ... .., An are according to step 1) in the inverse process that extracts revert to size for M × N
Image, then by which according to step 1) in adjustment inverse process be adjusted to size be M1 × N1 image.
The step 1) described in adjustment original image concrete grammar be：If M1, N1 can not be divided exactly by K, L respectively
When, then the edge of original image X is filled using the pixel value of adjacent lines or adjacent column, original image X is adjusted to be formed
For the image A that size is M × N；It is not required to adjust if when M1, N1 can be divided exactly by K, L respectively, i.e. M1=M, N1=N.
The step 3) in size M1, N1 of original image X and sequencing numbers h are embedded into step 2) in formed little
Image sequence B1, B2 ... the concrete grammar in .., Bn is：Information to be embedded is embedded into from new by the method for Information hiding
In first in little image sequence little image B1 after arrangement, remaining little image is constant.
The step 4) in stego-image sequence C 1, C2 ... the step of .., Cn carry out Video coding is as follows：According to
The compression ratio of jpeg format arranges video encoder quantization step parameter Qp H.264 so that compression ratio is not less than Joint Photographic Experts Group,
The Video coding of standard is carried out again.
Present invention advantage compared with prior art is：
Main JPEG of current conventional method for compressing image etc., video-frequency compression method mainly have MEPG-2, MEPG-4,
H.264 etc., some other compression methods are also refer in current document.But all against two in existing research and application
Plant media and employ different compression processing modes：It is provided without because of its effect difference come encoded video using Image Compression,
The method for being encoded rest image using video compression technology is not occurred yet.The method has broken routine, to elder generation during picture coding
By image contract, video sequence is arranged in, the method using Video coding obtains higher compression compressing rest image
Than.In addition, impact of the random little image sequence changed after decomposing to compression performance is very little, therefore, the method is sending
Holding and the position of subimage being rearranged using the arrangement mode that arranges, encryption has been reached in the case where compression performance is not changed
Effect, this has broken the sightless tradition of existing AES.
The present invention compresses rest image using video coding technique, obtains compared to JPEG image compression method higher
Compression ratio, achieve unexpected effect.
(1) present invention proposes the unique method that a kind of employing video encoding standard compresses rest image, is improving compression
Than in the case of, moreover it is possible to play a part of encryption to rest image, the safety of Still Image Transmission is improve.
(2) the static coded method based on video that the present invention is adopted, its performance are better than currently being widely used in image
The JPEG compression standard in field.
(3) present invention utilizes the characteristics of dependency is very strong between little image sequence, the row of the little image sequence of random change
Row order, had not so not only affected on compression ratio but also can play a part of encryption, and different with conventional cryptography, and this method is also covered
The fact that covered encryption.
(4) present invention becomes several low-quality images a high-quality image and is transmitted, to original height
Quality image serves the effect of protection.Disabled user can only obtain low-quality image, and the recovery of validated user energy high-fidelity
Go out original image.
(5) image, video can be compressed by the present invention using a kind of encoding device, can be in only video encoder
In the case of, remain to the coding work for completing video and image.
(6) present invention can be used simultaneously with traditional encryption method.
Description of the drawings
Fig. 1 is the flow chart of the present invention；
Fig. 2 is test original image；
Fig. 3 is the image after adjustment；
Fig. 4 is the little image sequence after decomposing.
Specific embodiment
As shown in figure 1, a kind of compression of images and security transmission method based on video of the present invention, comprises the following steps that：
1) the original image X by size for M1 × N1 is adjusted to size for M × N's according to standard video image size K × L
Image A, to adjustment after image A extracted and formed image sequence A1, A2 ... .., An；Wherein, each little image A1,
A2 ... the size of .., An is K × L；Described M, N can be divided exactly by K, L respectively；If M1, N1 can not be divided exactly by K, L respectively
When, then the edge of original image X is filled using the pixel value of adjacent lines or adjacent column, original image X is adjusted to be formed
For the image A that size is M × N；It is not required to adjust if when M1, N1 can be divided exactly by K, L respectively, i.e. M1=M, N1=N；
2) as shown in Table 1, arranged according to transmitting-receiving two-end in advance the sequencing numbers h of sequencing table by image sequence A1,
A2 ... the order of .., An 1,2 ..., n become p1, p2 ... .., pn or q1, q2 ... .., qn or s1,
S2 ... .., sn etc., formed new image sequence B1, B2 ... .., Bn.Wherein, corresponding original alignment order during sequence number h=0
1,2 ...., n；Correspondingly arrange to put in order during h=1 p1, p2 ... .., pn；Correspondingly arrange to put in order during h=2 q1,
q2、.....、qn；.....；Correspondingly arrange to put in order during h=J s1, s2 ... .., sn etc., i.e. agreement order can select many
Plant random permutation order；
Table one
| Sequence number h | Sequentially |
| 0 | 1,2 ...., n |
| 1 | P1, p2 ... .., pn |
| 2 | Q1, q2 ... .., qn |
| ......... | .......... |
| J | S1, s2 ... .., sn |
3) size M1, N1 of original image X and sequencing numbers h are embedded into step 2) the middle little image sequence for being formed
B1, B2 ... in .., Bn, formed stego-image sequence C 1, C2 ... .., Cn；Information to be embedded can be pressed during concrete operations
The method of Information hiding is embedded in first little image B1 in the little image sequence from after newly arranging, and remaining little image is not
Become.
4) by stego-image sequence C 1, C2 ... .., Cn are compressed according to standard video coder method；Basis first
The compression ratio of jpeg format arranges video encoder quantization step parameter Qp H.264 so that compression ratio is not less than Joint Photographic Experts Group,
The Video coding of standard is carried out again.
Stego-image sequence C 1, C2 after 5) receiving terminal is restored after standard video decoding ... .., Cn；
6) from stego-image sequence C 1, C2 ... extract embedded information M1, N1, h in .., Cn, original so as to obtain
The size of image X and the value of sequencing numbers h, so be restored little image sequence B1, B2 ... .., Bn；
7) according to sequencing numbers h by B1, B2 ... .., Bn revert to little image sequence A1, A2 ... .., An；
8) by little image sequence A1, A2 ... .., An are according to step 1) in the inverse process that extracts revert to size for M × N
Image, then by which according to step 1) in adjustment inverse process be adjusted to size be M1 × N1 image.
In order to verify that the performance set forth herein method, experiment employ 8 that 8 general in the world width sizes are 512 × 512
Bit grayscale image is emulated, and test image is as shown in Figure 2.First divide the image into little image sequence (can also claim during emulation
For video) and then compressed using H.264 video encoding standard, and by which compared with the effect of Joint Photographic Experts Group JPEG
Compared with test result indicate that method proposed by the present invention is in the case where Y-PSNR (PSNR) is roughly the same, compression ratio is improved
6.6%～31.2%；In the case where compression ratio is roughly the same, PSNR improves 0.4～5.5dB, and demonstrate algorithm has
Effect property.
By 8 width standard pictures according to H.264 standard in a kind of picture size 176 × 144 form adjusting, Ran Houfen
Solution carries out video compress into after little image sequence；What JPEG still compressed is 512 × 512 artwork.Image after decomposition such as Fig. 3
Shown.
For example work as M1=512, N1=512, K=176, during L=144, M=528, N=576.
When can not be divided exactly by K, L respectively due to M1, N1, Lena images are adjusted, its edge is using adjacent lines or phase
The pixel value of adjacent column is filled, and is formed as the image A that size is 528 × 576 after adjustment.
According to extracting to form little image sequence every 4 row (L1=3, the L2=4) methods sampled every 3 rows, decomposed 12 little
Image, wherein, the pixel in first little image is taken in (the j-1) × L2+1 row in (the i-1) × L1+1 rows in original image
The value of pixel, wherein i is 1 to 144 for the value of 1 to 176, j.Effect is as shown in figure 4, the size of each little image is 176
×144.
As can be seen from the figure each the little image for decomposing out has very strong similarity, therefore, when we arrange again
It is difficult to be noticeable during the order of the little image after row decomposition, in addition, the strong similarity between little image also is just suitable for utilizing regarding
Frequency coding standard is compressed coding to which：
In order to verify that the effectiveness of the carried algorithm of the present invention, Tables 1 and 2 list situation roughly the same in compression ratio respectively
Under PSNR correction datas and the compression ratio correction data in the case of PSNR is roughly the same.Wherein table 1 is identical compression ratio
In the case of PSNR contrasts after JPEG and coding H.264, table 2 is to have a look JPEG and H.264 in the case of identical PSNR
Compression ratio contrast after coding；Data from table 1 are averagely improve in compression ratio after can be seen that the application method of the present invention
In the case of 1.6%, PSNR averagely obtains the gain of 2.04dB；Data from table 2 can be seen that the side of the application present invention
After method in the case where PSNR averagely obtains 0.19dB gains, compression ratio averagely improves 20.54%.
Table 1
Table 2
The content not being described in detail in description of the invention belongs to the known technology of those skilled in the art.
Claims (1)
1. a kind of compression of images and security transmission method based on video, it is characterised in that step is as follows：
1) the original image X by size for M1 × N1 is adjusted to the image that size is M × N according to standard video image size K × L
A, to adjustment after image A extracted and formed image sequence A1, A2 ... .., An；Wherein, each little image A1,
A2 ... the size of .., An is K × L；Described M, N can be divided exactly by K, L respectively；The concrete grammar of the adjustment original image
For：If M1, N1 can not be divided exactly by K, L respectively, the edge to original image X is using adjacent lines or the pixel value of adjacent column
It is filled, original image X adjustment is formed as the image A that size is M × N；If when M1, N1 can be divided exactly by K, L respectively
It is not required to adjust, i.e. M1=M, N1=N；
2) according to putting in order of making an appointment of transmitting-receiving two-end by image sequence A1, A2 ... .., An are obtained new from new sort
Image sequence B1, B2 ... .., Bn, and the numbering that puts in order of the agreement is designated as h；
3) size M1, N1 of original image X and sequencing numbers h are embedded into step 2) the middle little image sequence B1 for being formed,
B2 ... in .., Bn, formation stego-image sequence C 1, C2 ... .., Cn；Size M1, N1 of original image X and sequence are compiled
Number h is embedded into step 2) in formed little image sequence B1, B2 ... the concrete grammar in .., Bn is：Information to be embedded
It is embedded in first little image B1 in the little image sequence from after newly arranging by the method for Information hiding, remaining little image is not
Become；
4) by stego-image sequence C 1, C2 ... .., Cn are compressed according to standard video coder method；To stego-image sequence
C1, C2 ... the step of .., Cn carry out Video coding is as follows：H.264 video encoder is arranged according to the compression ratio of jpeg format
Quantization step parameter Qp so that compression ratio is not less than Joint Photographic Experts Group, then the Video coding for carrying out standard；
Stego-image sequence C 1, C2 after 5) receiving terminal is restored after standard video decoding ... .., Cn；
6) from stego-image sequence C 1, C2 ... extract embedded information M1, N1, h in .., Cn, so as to obtain original image X
Size and sequencing numbers h value, and then be restored little image sequence B1, B2 ... .., Bn；
7) according to sequencing numbers h by B1, B2 ... .., Bn revert to little image sequence A1, A2 ... .., An；
8) by little image sequence A1, A2 ... .., An are according to step 1) in extract inverse process revert to size be M × N figure
Picture, then by which according to step 1) in adjustment inverse process be adjusted to size be M1 × N1 image.
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| CN104469372B (en) * | 2014-11-06 | 2018-09-07 | 中国科学院计算技术研究所 | Method and system for the light field image for compressing microlens array acquisition |
| CN106375766B (en) * | 2016-09-08 | 2018-12-18 | 电子科技大学 | A kind of light field image compression method |
| CN107018429A (en) * | 2017-04-26 | 2017-08-04 | 陈翟 | Internet video data compression and frame picture display process |
| CN108694734B (en) * | 2018-04-20 | 2022-03-04 | 西安空间无线电技术研究所 | Data compression method suitable for complex image |
| CN108848385B (en) * | 2018-06-20 | 2021-04-13 | 西安空间无线电技术研究所 | Block data compression method suitable for micro-nano satellite |
| CN109040114B (en) * | 2018-09-05 | 2021-02-26 | 唯得智慧（湖北）科技有限公司 | Safe and reliable image transmission method based on narrow-band Internet of things |
| CN116055008B (en) * | 2023-03-31 | 2023-06-02 | 深圳市网联天下科技有限公司 | Router data processing method for cloud server connection |
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