CN111669394B - Method for hiding and transmitting image and voice information of satellite communication - Google Patents
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Abstract
The invention provides a method for hiding and transmitting image and voice information of satellite communication, which changes image data and voice data into Chinese characters in the frame of the national Chinese character coding standard GB2312 by carrying out a series of targeted processing and proper data region coding on the image data and the voice data, and realizes lossless information hiding of original data such as image and voice and the like based on a Chinese character information hiding method. The invention can realize lossless information hiding with embedding rate of 18.75% by converting the original data, does not increase the transmitted data quantity, can restore the original image or voice data without loss or near loss, and has transmission concealment. The method improves the transmission efficiency and the practicability of the communication system, expands the application range of the satellite communication data transmission system, and can provide new value-added information service for different users.
Description
Technical Field
The invention relates to a data transmission method, in particular to a satellite communication image voice information hiding method, and belongs to the field of communication (such as data communication technology and the like).
Background
With the development of satellite communication technology, people have an increasing demand for various information to be transmitted in a concealed manner through satellite communication, such as the demand for information to be concealed in images, voice and characters.
Many satellite communication systems in China also have short message transmission function and can transmit Chinese characters.
The information hiding technology provides possibility for the application of satellite communication and opens up a brand new way. By hiding the information in the satellite image, voice and characters, the information is transmitted by the way without influencing the normal communication of the satellite, the data format of a satellite channel is not changed, and the transmission data volume is not increased.
The method can increase the practicability of the satellite communication system, expand the application range of the satellite communication system in China, and provide new information carrying and value-added services for users.
The GB2312 national standard code is the national standard for Chinese information processing released in 1980, and is also called Chinese character exchange code, which is called GB code for short. The most commonly used 6763 Chinese characters are divided into two levels: 3755 primary Chinese characters are arranged according to Chinese pinyin; 3008 secondary Chinese characters are arranged according to the radicals of the Chinese character. Each Chinese character has a zone bit code. One country code occupies two bytes.
Disclosure of Invention
The technical problem solved by the invention is as follows: the method for hiding the image and voice information of the satellite communication overcomes the defects of the prior art, converts the image data and the voice data into Chinese characters in a new mode, carries out information hiding processing in the Chinese characters, and realizes lossless information hiding of original data such as image and voice and the like based on a Chinese character information hiding method. The invention can realize information hiding with fixed embedding rate (18.75 percent) by converting different types of original data, does not increase the transmitted data quantity, can recover original image or voice data without loss or near loss, solves the problems of inconsistent hiding capacity and poor disguise of different carriers of a satellite communication system, and has transmission concealment.
The technical scheme of the invention is as follows:
the method for hiding and transmitting the satellite communication image voice information comprises the following steps:
(1) preprocessing the image voice data A, and transforming the image voice data A into given interval data sets Q1 and Q2;
(2) transforming the given interval data sets Q1 and Q2 to Hanzi data sets HZ1 and HZ 2;
(3) lossless hiding the secret information S in the data sets HZ1 and HZ2 to obtain a secret data set HZ;
(4) storing or transmitting the dense data set HZ;
(5) decoding the data set HZ to obtain secret information S and data sets HZ1 and HZ 2;
(6) inversely transforming the data sets HZ1 and HZ2 to obtain interval data sets Q1 and Q2;
(7) the data sets Q1 and Q2 are subjected to the reverse processing, resulting in restored image voice data a.
The specific steps of preprocessing the image voice data a in the step (1) are as follows:
respectively judging the numerical value transformation range of the odd bit data and the even bit data of the image voice data A, and enabling the odd bits to be the maximum value max1 and the minimum value min 1; let the even number: maximum max2, minimum min 2;
if max1-min1 is less than or equal to T1, subtracting min1 from the odd-numbered digit value of the image voice data A to obtain a given interval data set Q1; if max2-min2 is less than or equal to T2, subtracting min2 from the even number value of the image voice data A to obtain a given interval data set Q2; wherein T1 and T2 are set thresholds which are positive integers and meet the condition that T1+ T2 is not more than 173, (T1+1) (T2+1) is not more than 7614;
if the above conditions are not met, dividing the odd numerical value of the image voice data A by P for rounding to obtain a given interval data set Q1, and enabling the number in the Q1 data set to be less than or equal to T1; dividing the value of the even number digit of the image voice data A by P for rounding to obtain a given interval data set Q2, and enabling the number in the Q2 data set to be less than or equal to T2; wherein, P is a positive integer, T1 and T2 are set thresholds, both are positive integers, and satisfy the condition T1+ T2 ≤ 173.
The specific steps of the step (2) for converting the data sets Q1 and Q2 in the given interval into the Chinese character data sets HZ1 and HZ2 according to different value ranges of T1 and T2 are as follows:
21) when T1 is more than 80 and T2 is less than or equal to 93,
then transform the Q1 interval [0, T1], Q2 interval [0, T2] into: q1: [0,80] [81, T1] Q2: [0, T2]
The Q1 interval [81, T1] is transformed to the Q2 high-order interval [ T2+1, T2+ T1-80], so that:
HZ 1: [0,80] and HZ2: [0, T2+ T1-80]
22) When T1 is less than or equal to 80 and T2 is more than 93,
then transform the Q1 interval [0, T1], Q2 interval [0, T2] into: q1: [0, T1] Q2: [0,93] [94, T2]
The Q2 interval [94, T2] is transformed to the Q1 high-order interval [ T1+1, T1+ T2-93], so that:
HZ 1: [0, T1+ T2-93] and HZ2: [0,93]
Since T1+ T2 ≦ 173, then T1+ T2-93 ≦ 80
23) When T1 is less than or equal to 80 and T2 is less than or equal to 93, directly converting the Q1 interval [0, T1] and the Q2 interval [0, T2] into HZ 1: [0, T1] and HZ2: [0, T2]
After the preprocessing is completed, each character A is uniquely represented as (HZ1, HZ2), and since the parameters T1+ T2 ≦ 173, in the above cases, HZ1 ranges from 0 to 80 and HZ2 ranges from 0 to 93.
And (4) adopting an information hiding method based on GB2312 Chinese characters as the hiding method in the step (3).
And (5) adopting an information hiding and decoding method based on GB2312 Chinese characters.
The step (6) of inverse transforming the data sets HZ1 and HZ2 to obtain the interval data sets Q1 and Q2 comprises the following steps:
61) when T1 is greater than 80 and T2 is less than or equal to 93, HZ1 and HZ2 are converted into HZ 1: [0,80] and HZ2: [0, T2] [ T2+1, T2+ T1-80], transforming the HZ2 interval [ T2+1, T2+ T1-80] to the HZ1 high-order interval [81, T1], obtaining Q1: [0, T1], Q2: [0, T2 ];
62) when T1 is less than or equal to 80 and T2 is greater than 93, HZ1 and HZ2 are converted into: HZ 1: [0, T1] [ T1+1, T1+ T2-93] and HZ2: [0,93], transformation of the HZ1 interval [ T1+1, T1+ T2-93] to the HZ2 high interval [94, T2], yielding Q1: [0, T1], Q2: [0, T2 ];
63) when T1 is less than or equal to 80 and T2 is less than or equal to 93, directly converting an HZ1 interval [0, T1], an HZ2 interval [0, T2] into Q1 and Q2 intervals to obtain Q1: [0, T1] and Q2: [0, T2 ].
The step (7) is to perform inverse processing on the data sets Q1 and Q2 to obtain the restored image voice data a, and the specific steps are as follows:
if the odd number max1-min1 of the original data is less than or equal to T1, adding min1 to Q1 to obtain the odd number of the image voice data A; if the even number max2-min1 of the image voice data A is less than or equal to T2, adding min2 to Q2 to obtain the even number of the image voice data A, wherein T1 and T2 are preset thresholds and are positive integers;
if the conditions are not met, multiplying the data set Q1 by P to obtain the odd bits of the image voice data A; the data set Q2 is rounded by multiplying by P, which is a positive integer, to obtain the even-numbered bits of the image-speech data a.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention breaks through the conventional thinking and changes the original data of images, voice and the like into Chinese characters for information hiding; the traditional method does not convert image voice into Chinese characters and then hide information, because the traditional Chinese character information hiding (watermark) is small in capacity;
(2) the invention maps the odd number bit and the even number bit of the original data into a new data set and then changes the new data set into the high byte and the low byte data of the Chinese character, and the Chinese character and the code are transmitted instead of the original data, thereby improving the concealment of the data;
(3) the hiding method provided by the invention can realize large-capacity hiding of original data by means of a Chinese character information hiding method, realize blind extraction and do not need additional information.
(4) The invention is based on GB2312 Chinese character, the information hiding embedding capacity can be a constant value 3/16, and the problem that one method can be suitable for various types of data is solved;
(5) the invention recovers the image and voice original data with high quality, and the visual sense and the auditory sense can not be distorted. In some cases the original data is lossless, typically approximately lossless. Compared with the classical algorithms such as LSB and the like, the method recovers the peak signal-to-noise ratio (PSNR) of the original data under the same hiding capacity (3/16) to be 49-50dB, is better than the LSB algorithm (45-46dB), and has concealment.
(6) The method has certain openness, and the method with good Chinese character information hiding effect can be applied as a step of the method, so that the method has the potential of further improving hiding capacity.
Drawings
FIG. 1 is a flow chart of the method of the present invention.
Detailed Description
The method for hiding and transmitting the satellite communication image voice information can hide the secret information with fixed capacity in the image voice data, has certain universality and meets the requirements of users.
By using the method provided by the invention, the secret information can be hidden in any original image (such as a bmp format image) and original voice data (such as a wav format image) in a lossless or approximately lossless manner, and the typical relative hiding capacity is 3/16-18.75%. The secret information of 3/16 is embedded in each 2 bytes of data, i.e. 3 bits of information can be hidden in any data (16 bits).
If the image size is 512 bytes by 512 bytes, the embeddable character length is 49152 bytes;
if the voice file size is 65536 bytes, the embeddable character length is 12288 bytes;
if the SAR data size is 256 × 256 bytes, the embeddable character length is 12288 bytes;
if the original data length is 640 bytes, the length of the embeddable character is 640 x 3/16-120 bytes;
if the character length is 800 bytes, the length of the embeddable character is 800 × 3/16-150 bytes;
if the character length is 960 bytes, the embeddable character length is 960 × 3/16-180 bytes;
if the character length is 1024 bytes, the length of the embeddable character is 1024 × 3/16 ═ 192 bytes;
if the character length is 2048 bytes, the embeddable character length is 512 × 3/16 ═ 384 bytes;
if the character length is 1600 bytes, the length of the embeddable character is 1600 × 3/16-300 bytes;
if the character length is 2400 bytes, the embeddable character length is 2400 × 3/16-450 bytes;
if the character length is 2560 bytes, the length of the embeddable character is 2560 × 3/16 ═ 480 bytes;
if the character length is 5120 bytes, the length of the embeddable character is 5120 × 3/16 ═ 960 bytes;
if the character length is 6400 bytes, the length of the embeddable character is 6400 × 3/16-1200 bytes;
if the character length is 8000 bytes, the length of the embeddable character is 8000 x 3/16-1500 bytes;
the original image voice data length K is not changed, namely the K multiplied by 3/16 byte data can be embedded in the original image voice data length K without distortion, the transmission efficiency is improved by 18.75%, the secret information has disguise property, and hidden transmission is carried out.
If the data with the secret is compressed without distortion, the embedding amount can be increased on the basis, and the information hiding capacity is larger. The method can always ensure that the fixed length information is embedded in the original image voice data without damage, and meets the safety requirements of users.
The invention carries out coding pretreatment on image and voice data, converts the image and voice data into a Chinese character coding standard frame, and then carries out Chinese character information hiding, thereby realizing 3/16 lossless or nearly lossless information hiding embedding rate, transmitting nearly 20% of information in the original data such as image and voice by utilizing the Chinese character pretreatment under the condition of not increasing any transmission data quantity, disguising the original data such as image and voice into a Chinese character code sequence for transmission, recovering the hidden information without loss, and having large capacity hiding and hiding transmission effects.
As shown in fig. 1, the embodiment of the present invention consists of the following steps:
firstly, preprocessing image and voice data A, and transforming the image and voice data A into given interval data sets Q1 and Q2;
the method for preprocessing the original data A comprises the following steps:
(1) assuming that the difference between the maximum value max1 of the odd number bits and the minimum value min1 of the data set A is 80, and the difference between the maximum value max2 of the even number bits and the minimum value min2 is 93, the data sets Q1 and Q2 of the given interval are obtained, wherein Q1 is [0,80], and Q2 is [0,93 ]; wherein min1 is 10, min2 is 30;
(2) assuming that the difference between the maximum value max1 of the odd bits and the minimum value min1 of the data set a is 127, and the difference between the maximum value max2 of the even bits and the minimum value min2 of the even bits is 200, taking P to be 3, the value range of the data set a is 0-255, and the value of the data set a is divided by 3 to be rounded, so that an interval Q1 is obtained, and Q2 is [0,85 ];
the second step transforms the data sets Q1 and Q2 for the given interval to the data sets HZ1 and HZ2 to which the Kanji character C belongs;
(1) if Q1 interval is [0,80] and Q2 interval is [0,93], Q1 and Q2 are directly converted into
HZ 1: [0,80] and HZ2: [0,93]
(2) If the interval Q1 is [0,85] and the interval Q2 is [0,85], Q1 and Q2 are converted into Q1: [0,80] [81,85] Q2: [0,85]
And converting the Q1 interval [81,85] to the high position of the Q2 interval [86,90], thus obtaining:
HZ 1: [0,80] and HZ2: [0,90]
After the pre-processing is completed, each kanji character C can be uniquely represented as (H0, L0), where H0 belongs to data set HZ1, which ranges from 0-80; l0 belongs to dataset HZ2, ranging from 0-93 or 0-90;
thirdly, the secret information S is hidden in the data sets HZ1 and HZ2 in a lossless manner to obtain a secret data set HZ;
format of the secret information S: the 1 st bit is a flag bit S0, and if S0 is 0, the bit is subsequently secret information; if S0 is equal to 1, a 1-bit flag bit P0 is set behind the bit, the subsequent 2 bytes of P0 are min1 and min2, and the rest is secret information; p0 ═ 0, meaning that the intervals Q1, Q2 are Q1[0,80], Q2 is [0,93 ]; p0 is 1, indicating that both Q1 and Q2 intervals are [0,85 ];
the specific information hiding method is 'a satellite short message data and information cooperative transmission method' of patent 1.
Firstly, encoding Chinese character C to obtain A1, which can be expressed as (H1, L1), and the specific steps are as follows:
if the high byte H0 is between 0 and 80 and the low byte L0 is between 0 and 63, then H0 and L0 are unchanged, i.e., H1 ═ H0 and L1 ═ L0; c encodes A1(H1, L1), equal to (H0, L0), wherein H1 is between 0-80 and L1 is between 0-63;
if the high byte H0 is between 0 and 63 and the low byte L0 is between 64 and 93, then H1 is L0+17 and L1 is H0; c encodes A1(H1, L1), wherein H1 is between 81-110 and L1 is between 0-63;
if the high byte H0 is between 64 and 80 and the low byte L0 is between 64 and 93, then H1 is H0+47 and L1 is L0-64; c encodes A1(H1, L1), wherein H1 is between 111 and 127, and L1 is between 0 and 29;
the secret information S is then embedded in the encoded character a1, resulting in the secret character a 2. The sensitive information embedding method comprises the following steps:
sorting the sensitive information S in groups of 3 bits, resulting in (S1, S2, S3);
replace s1 for the highest bit of the high byte H1 in the encoded character a 1;
replace s2 for the highest bit of the lower byte L1 in the encoded character a 1;
replace s3 for the next highest bit of the lower byte L1 in the encoded character A1;
upon completion of the above operation, a secret character a2, denoted as (H2, L2), is obtained, constituting the secret data set HZ.
Fourthly, storing or transmitting the dense data set HZ;
fifthly, decoding the data set HZ to obtain secret information S and data sets HZ1 and HZ 2; extracting secret information S from the received secret-containing character a 2:
the highest bit of the high byte H2 in the ciphertext character a2 is extracted as s1, while the highest bit position 0 of H2 is extracted;
the highest bit of the low byte L2 in the ciphertext character a2 is extracted as s2, while the highest bit position of L2 is 0;
the next highest bit of the low byte L2 in the ciphertext character a2 is extracted as s3, while the next highest bit of L2 is at position 0;
upon completion of the above operation, the sensitive information S and the encoded character A1 are obtained, which is denoted as (H1, L1). Decoding the character A1 to obtain C, which comprises the following steps:
if the high byte H1 and the low byte L1 of the character a1 are between 0 and 80 and 0 and 63, then H0 is H1 and L0 is L1; c after decoding is (H0, L0), wherein H0 is between 0-80 and L0 is between 0-63;
if the high byte H1 of the character a1 is between 81-110 and the low byte L1 is between 0-63, then H0 ═ L1, L0 ═ H1-17; c after decoding is (H0, L0), wherein H0 is between 0-63 and L0 is between 64-93;
if the high byte H1 of the character a1 is between 111-127 and the low byte L1 is between 0-29, then H0-H1-47 and L0-L1 + 64; c is (H, L) after decoding, wherein H0 is between 64 and 80, and L0 is between 64 and 93;
sixthly, inversely transforming the decoded character C (H0, L0) data sets HZ1 and HZ2 to obtain interval data sets Q1 and Q2;
(1) if the flag in the secret information S is S0 ═ 0, HZ1[0,80] and HZ2[0,90] are converted into: HZ1[0,80], HZ2[0,85] [85,90], then changing HZ1[0,80] to the lower [0,80] of the interval Q1, converting the interval [86,90] of HZ2 to the upper [81,85] of the interval Q1, converting the interval [0,85] of HZ2 to the interval [0,85] of Q2;
(2) if the flag S0 is 1 and P0 is 0 in the secret information S, the HZ1 interval [0,80], HZ2 interval [0,93] are directly converted into: q1[0,80], Q2: [0,93]
(3) If the flag in the secret information S is S0 ═ 1 and P0 ═ 1, HZ1[0,80] and HZ2[0,90] are transformed into: HZ1[0,80], HZ2[0,85] [85,90], then changing HZ1[0,80] to the lower [0,80] of the interval Q1, converting the interval [86,90] of HZ2 to the upper [81,85] of the interval Q1, converting the interval [0,85] of HZ2 to the interval [0,85] of Q2;
seventhly, performing inverse processing on the data sets Q1 and Q2 to obtain recovered original data A;
(1) if the flag bit S0 of the secret information S is 1, extracting decimal numbers corresponding to two bytes after the flag bit P0 as min1 and min2, where the odd-numbered bits of the original data a are Q1+ min1, and the even-numbered bits of the original data a are Q2+ min 2;
(2) if the 1 st bit S0 of the secret information S is 0, which indicates that the difference between the maximum value max1 of the odd bits of the original data a and the min1 is greater than T1, or the difference between the maximum value max2 of the even bits of the original data a and the min2 is less than T2, the odd bits of the original data a are rounded by multiplying Q1 by 3, and the even bits of the original data a are rounded by multiplying Q2 by 3.
Therefore, the hiding of the satellite communication image voice information and the extraction of the secret information are completed.
The method can embed at least 3/16 information in image and voice data, i.e. any two bytes (16 bits) of data can be hidden with at least 3 bits of information, so that the transmission efficiency is improved by 18.75%, and the method has certain security and confidentiality.
The invention provides a non-traditional method for hiding and transmitting image and voice information of satellite communication, which solves the problems of inconsistent hiding capacity and poor disguise of different carriers of a satellite communication system through innovation, image and voice data are not directly transmitted in a channel, but are disguised in a Chinese character code form for hidden transmission, the problem of inconsistent hiding capacity of different carriers in a satellite or other occasions is also solved, the hiding capacity is fixed, and the transmission efficiency is improved.
In the information hiding process, the method can restore the original data without loss or near loss without any additional information, does not need complex operation in the hiding process, and can be realized in real time through software or hardware.
The Chinese character coding standard of the national GB2312 is utilized to realize the information hiding capacity of nearly 20 percent, the transmission efficiency of data such as image, voice and the like is improved to 120 percent of the original transmission efficiency unconditionally, the transmission cost is saved, the capacity of satellite communication is increased, the application of the satellite communication is expanded, new value-added information services can be provided for different users, and the method has application value in space data transmission and ground information transmission systems.
The invention is not described in detail and is within the knowledge of a person skilled in the art.
Claims (7)
1. The method for hiding and transmitting the satellite communication image voice information is characterized by comprising the following steps of:
(1) preprocessing the image voice data A, and transforming the image voice data A into given interval data sets Q1 and Q2;
(2) transforming the given interval data sets Q1 and Q2 to Hanzi data sets HZ1 and HZ 2;
(3) lossless hiding the secret information S in the data sets HZ1 and HZ2 to obtain a secret data set HZ;
(4) storing or transmitting the dense data set HZ;
(5) decoding the data set HZ to obtain secret information S and data sets HZ1 and HZ 2;
(6) inversely transforming the data sets HZ1 and HZ2 to obtain interval data sets Q1 and Q2;
(7) the data sets Q1 and Q2 are subjected to the reverse processing, resulting in restored image voice data a.
2. The method according to claim 1, wherein the step (1) of preprocessing the image voice data a comprises the following steps:
respectively judging the numerical value transformation range of the odd bit data and the even bit data of the image voice data A, and enabling the odd bits to be the maximum value max1 and the minimum value min 1; let the even number: maximum max2, minimum min 2;
if max1-min1 is less than or equal to T1, subtracting min1 from the odd-numbered digit value of the image voice data A to obtain a given interval data set Q1; if max2-min2 is less than or equal to T2, subtracting min2 from the even number value of the image voice data A to obtain a given interval data set Q2; wherein T1 and T2 are set thresholds which are positive integers and meet the condition that T1+ T2 is not more than 173, (T1+1) (T2+1) is not more than 7614;
if the above conditions are not met, dividing the odd numerical value of the image voice data A by P for rounding to obtain a given interval data set Q1, and enabling the number in the Q1 data set to be less than or equal to T1; dividing the value of the even number digit of the image voice data A by P for rounding to obtain a given interval data set Q2, and enabling the number in the Q2 data set to be less than or equal to T2; wherein P is a positive integer.
3. The hidden transmission method for image and voice information via satellite communication as claimed in claim 2, wherein the step (2) of converting the given interval data sets Q1 and Q2 into the Kanji data sets HZ1 and HZ2 comprises the following steps:
21) when T1 is more than 80 and T2 is less than or equal to 93,
then transform the Q1 interval [0, T1], Q2 interval [0, T2] into: q1: [0,80] and [81, T1], Q2: [0, T2 ];
the Q1 interval [81, T1] is transformed to the Q2 high-order interval [ T2+1, T2+ T1-80], so that:
HZ 1: [0,80] and HZ2: [0, T2+ T1-80]
22) When T1 is less than or equal to 80 and T2 is more than 93,
then transform the Q1 interval [0, T1], Q2 interval [0, T2] into: q1: [0, T1], Q2: [0,93] and [94, T2 ];
the Q2 interval [94, T2] is transformed to the Q1 high-order interval [ T1+1, T1+ T2-93], so that:
HZ 1: [0, T1+ T2-93] and HZ2: [0,93 ];
since T1+ T2 ≦ 173, then T1+ T2-93 ≦ 80;
23) when T1 is less than or equal to 80 and T2 is less than or equal to 93, directly converting the Q1 interval [0, T1] and the Q2 interval [0, T2] into HZ 1: [0, T1] and HZ2: [0, T2 ];
each character A is uniquely represented as (HZ1, HZ2), and since the parameters T1+ T2 ≦ 173, the range of HZ1 is 0-80, and the range of HZ2 is 0-93.
4. The method for hiding and transmitting the image and voice information of the satellite communication according to claim 1, wherein the hiding method in the step (3) adopts an information hiding method based on GB2312 Chinese characters.
5. The method according to claim 1, wherein the decoding method in step (5) is an information de-hiding method based on GB2312 chinese characters.
6. The method for hidden transmission of voice information from satellite communication images as claimed in claim 3, wherein the step (6) of inverse transforming the data sets HZ1 and HZ2 to obtain the interval data sets Q1 and Q2 comprises the following steps:
61) when T1 is greater than 80 and T2 is less than or equal to 93, HZ1 and HZ2 are converted into HZ 1: [0,80] and HZ2: [0, T2] and [ T2+1, T2+ T1-80], the HZ2 interval [ T2+1, T2+ T1-80] is transformed to the HZ1 high-order interval [81, T1], and Q1 is obtained: [0, T1], Q2: [0, T2 ];
62) when T1 is less than or equal to 80 and T2 is greater than 93, HZ1 and HZ2 are converted into: HZ 1: [0, T1] and [ T1+1, T1+ T2-93], HZ2: [0,93], transformation of the HZ1 interval [ T1+1, T1+ T2-93] to the HZ2 high interval [94, T2], yielding Q1: [0, T1], Q2: [0, T2 ];
63) when T1 is less than or equal to 80 and T2 is less than or equal to 93, directly converting an HZ1 interval [0, T1], an HZ2 interval [0, T2] into Q1 and Q2 intervals to obtain Q1: [0, T1] and Q2: [0, T2 ].
7. The hidden transmission method for image and voice information of satellite communication according to claim 2, wherein the step (7) reverses the processing of the data sets Q1 and Q2 to obtain the recovered image and voice data a by the following steps:
if the odd number max1-min1 of the original data is less than or equal to T1, adding min1 to Q1 to obtain the odd number of the image voice data A; if the even number max2-min1 of the image voice data A is less than or equal to T2, adding min2 to Q2 to obtain the even number of the image voice data A, wherein T1 and T2 are preset thresholds and are positive integers;
if the conditions are not met, multiplying the data set Q1 by P to obtain the odd bits of the image voice data A; the data set Q2 is rounded by multiplying by P, which is a positive integer, to obtain the even-numbered bits of the image-speech data a.
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