WO2019095175A1 - 基于星座点距离的信息检测方法、装置及接收设备 - Google Patents

基于星座点距离的信息检测方法、装置及接收设备 Download PDF

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Publication number
WO2019095175A1
WO2019095175A1 PCT/CN2017/111216 CN2017111216W WO2019095175A1 WO 2019095175 A1 WO2019095175 A1 WO 2019095175A1 CN 2017111216 W CN2017111216 W CN 2017111216W WO 2019095175 A1 WO2019095175 A1 WO 2019095175A1
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Prior art keywords
carrier information
information
distance
carrier
original
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PCT/CN2017/111216
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English (en)
French (fr)
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谢宁
谭杰
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深圳大学
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Priority to PCT/CN2017/111216 priority Critical patent/WO2019095175A1/zh
Publication of WO2019095175A1 publication Critical patent/WO2019095175A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/38—Demodulator circuits; Receiver circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/06—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols the encryption apparatus using shift registers or memories for block-wise or stream coding, e.g. DES systems or RC4; Hash functions; Pseudorandom sequence generators
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H04L27/22—Demodulator circuits; Receiver circuits

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to an information detection method, apparatus, and receiving device based on constellation point distance.
  • Substitute steganography means that the original information is embedded in the secret information after channel coding, and the secret information is directly replaced with the original part information to achieve the purpose of information hiding.
  • the chi-square detection method is the earliest detection algorithm for the detection of Least Significant Bit (LSB) steganography, which tests the image by defining a chi-square statistic.
  • the probability of statistical characteristics enables detection of sequential LSB replacement, but does not detect LSB replacement at random locations.
  • the detection algorithm for LSB matching basically adopts methods such as neural network and pattern recognition.
  • the feature set is trained to extract effective features, and then the joint information of multiple features is used to detect the hidden information.
  • these methods are computationally intensive.
  • the test results are not precise enough and have limitations.
  • the embodiment of the invention discloses a method, a device and a receiving device for detecting information based on the distance of a constellation point, which can accurately detect the secret information.
  • a first aspect of the embodiments of the present invention discloses a method for detecting information based on a constellation point distance, including:
  • the performing, by the related processing on the first carrier information, sequentially obtaining the second carrier information, the original carrier information, and the third carrier information includes:
  • the original carrier information is remodulated to obtain third carrier information.
  • the performing, by the related processing on the second carrier information, obtaining the fourth carrier information includes:
  • the method further includes:
  • the first distance is less than or equal to the second distance, determining that there is no secret information in the first carrier information.
  • a second aspect of the embodiments of the present invention discloses an information detecting apparatus, including:
  • a receiving unit configured to receive the first carrier information that is matched by the channel
  • a processing unit configured to perform correlation processing on the first carrier information, and sequentially obtain second carrier information, original carrier information, and third carrier information;
  • the processing unit is further configured to perform correlation processing on the second carrier information to obtain fourth carrier information.
  • Determining a unit determining a first distance between the corresponding points, and a second distance between adjacent constellation points on the constellation;
  • a determining unit whether the first distance is greater than a second distance
  • the determining unit is configured to determine that the secret information exists in the first carrier information when the determining unit determines that the first distance is greater than the second distance.
  • the processing unit Performing related processing on the first carrier information, and sequentially obtaining the second carrier information, the original carrier information, and the third carrier information includes:
  • the original carrier information is remodulated to obtain third carrier information.
  • the processing unit is further configured to perform related processing on the second carrier information, and obtaining the fourth carrier information includes:
  • the determining unit is further configured to: when the determining unit determines that the first distance is less than or equal to the second distance, determine There is no hidden information in the first carrier information.
  • a third aspect of the embodiments of the present invention discloses a receiving device, where the receiving device includes a processor and a memory, and the processor executes the computer program stored in the memory to implement the constellation point according to any one of the above aspects. Distance information detection method.
  • a computer readable storage medium storing at least one instruction, the at least one instruction being executed by a processor, implementing the constellation point distance based information detecting method according to any one of the above first aspects .
  • the embodiment of the invention has the following beneficial effects:
  • the receiving device may receive the first carrier information that is matched by the channel, perform related processing on the first carrier information, and obtain the second carrier information, the original carrier information, and the third carrier information in sequence;
  • the second carrier information is subjected to correlation processing to obtain fourth carrier information;
  • the third carrier information and the fourth carrier information are compared to determine a point corresponding to the third carrier information and the fourth carrier information;
  • the receiving device may perform related processing on the received first carrier information, sequentially obtain the second carrier information, the original carrier information, and the third carrier information, and the receiving device may perform related on the second carrier information. Processing, obtaining fourth carrier information, and further comparing the fourth carrier information and the third carrier information The present invention analyzes and judges to determine that there is secret information in the first carrier information, so that the secret information can be accurately detected.
  • FIG. 1 is a diagram of a communication model for replacing steganography disclosed in an embodiment of the present invention
  • FIG. 2 is a schematic flow chart of a method for detecting information based on constellation point distance according to an embodiment of the present invention
  • FIG. 3 is a schematic structural diagram of an information detecting apparatus according to an embodiment of the present invention.
  • FIG. 4 is a schematic structural diagram of a receiving device according to an embodiment of the present invention.
  • the embodiment of the invention discloses a method, a device and a receiving device for detecting information based on the distance of a constellation point, which can accurately detect the secret information.
  • the details are described below in conjunction with the drawings.
  • FIG. 1 is a diagram of a communication model for replacing steganography disclosed in an embodiment of the present invention.
  • the alternative steganographic communication model can include two processes: a transmitting process and a receiving process.
  • the sending process is mainly performed by the sending device.
  • the sending device may include a base station or a user equipment.
  • a base station e.g., an access point
  • the base station can refer to a device in an access network that communicates with a wireless terminal over one or more sectors over an air interface.
  • the base station can be used to convert the received air frame to the IP packet as a router between the wireless terminal and the rest of the access network, wherein the remainder of the access network can include an Internet Protocol (IP) network.
  • IP Internet Protocol
  • the base station can also coordinate attribute management of the air interface.
  • the base station may be a base station (BTS, Base Transceiver Station) in GSM or CDMA, or may be a base station (NodeB) in WCDMA, or may be an evolved base station in LTE (NodeB or eNB or e-NodeB, evolutional Node B), the embodiment of the present invention is not limited.
  • User equipment may include, but is not limited to, a smart phone, a notebook computer, a personal computer (PC), a personal digital assistant (PDA), a mobile internet device (MID), a wearable device (such as a smart watch).
  • the operating system of the user device may include, but is not limited to, an Android operating system, an IOS operating system, a Symbian operating system, and a BlackBerry operating system.
  • the Windows Phone 8 operating system and the like are not limited in the embodiment of the present invention.
  • the transmitting device is divided into two paths, one is that the carrier information is encoded, and the other is that the secret information is encoded. After the two are encoded, the secret information is embedded in the carrier information, modulated, and then sent to the channel. The channel is sent to the receiving device.
  • the receiving process is mainly performed by the receiving device.
  • the receiving device may include a base station or a user equipment.
  • a base station e.g., an access point
  • the base station can refer to a device in an access network that communicates with a wireless terminal over one or more sectors over an air interface.
  • the base station can be used to convert the received air frame to the IP packet as a router between the wireless terminal and the rest of the access network, wherein the remainder of the access network can include an Internet Protocol (IP) network.
  • IP Internet Protocol
  • the base station can also coordinate attribute management of the air interface.
  • the base station can be a base station in GSM or CDMA (BTS, Base Transceiver)
  • the station may be a base station (NodeB) in WCDMA, or may be an evolved base station (NodeB or eNB or e-NodeB, evolutional Node B) in LTE, which is not limited in the embodiment of the present invention.
  • User equipment may include, but is not limited to, a smart phone, a notebook computer, a personal computer (PC), a personal digital assistant (PDA), a mobile internet device (MID), a wearable device (such as a smart watch).
  • the operating system of the user device may include, but is not limited to, an Android operating system, an IOS operating system, a Symbian operating system, and a BlackBerry operating system.
  • the Windows Phone 8 operating system and the like are not limited in the embodiment of the present invention.
  • the demodulated signal is extracted and then decoded to obtain the secret information, and then the signal after the secret information is extracted is decoded to obtain the carrier information.
  • the specific embedding method of the secret information may be BINARY PHASE SHIFT KEYING (BPSK) as an example.
  • the carrier information is encoded into 0, 1 sequence, and the secret information is also 0, 1 sequence.
  • the secret information can randomly replace some positions of the carrier information to hide the information.
  • the carrier information 0 can be replaced by the secret information 1
  • the carrier information 1 can be replaced by the secret information 0, after BPSK is - 1 changes to 1, 1 changes to -1.
  • the number of bits of the secret information needs to be smaller than the number of bits that can be corrected by the error correction capability of the carrier information. For example, suppose that the encoded information bits have k bits, for a total of n symbols, then the number of bits that can be corrected Take an integer, so the number of bits of the secret information is less than t in order to replace the steganography.
  • FIG. 2 is a schematic flowchart diagram of a method for detecting information based on constellation point distance according to an embodiment of the present invention. As shown in FIG. 2, the information detection method based on the constellation point distance may include the following steps:
  • Step 201 The receiving device receives the first carrier information that is matched by the channel.
  • Replace steganography which means that the original information is embedded in the secret information after channel coding, and the secret information is embedded. Directly replace the original part of the information to achieve information hiding purposes.
  • the transmitting device transmits the bearer-replaced bearer information through the channel, and the receiving device can obtain the first bearer information after the channel matching, wherein the first bearer information is the coded and modulated information.
  • Y is the carrier information after the channel H is multiplied
  • conj(H) is the conjugate of H
  • Y1 is the first carrier information
  • Step 202 The receiving device performs related processing on the first carrier information, and sequentially obtains second carrier information, original carrier information, and third carrier information.
  • the manner in which the receiving device performs related processing on the first carrier information, and the second carrier information, the original carrier information, and the third carrier information are sequentially obtained may be:
  • the original carrier information is remodulated to obtain third carrier information.
  • the hidden information that may be hidden in the second carrier information can be erased, and after re-encoding, the original carrier information can be obtained.
  • the first carrier information may include secret information
  • the third carrier information does not include secret information.
  • Step 203 The receiving device performs related processing on the second carrier information to obtain fourth carrier information.
  • the receiving device performs remodulation processing on the second carrier information to obtain fourth carrier information.
  • the modulation method is digital modulation.
  • the hidden information that may be hidden in the second carrier information may be erased, so that the second carrier information is remodulated to obtain the fourth carrier information.
  • the second carrier information is the same hidden information that may be hidden in the fourth carrier information.
  • Step 204 The receiving device compares the third carrier information with the fourth carrier information to determine a point corresponding to the third carrier information and the fourth carrier information.
  • the third carrier information is obtained by digitally modulating the original carrier information
  • the fourth carrier information is obtained by digitally modulating the second carrier information, so that the third carrier information and the fourth carrier information can be represented by a constellation.
  • the fourth carrier information is obtained by digitally modulating the second carrier information, and the second carrier information is demodulated by the first carrier information. Since the first carrier information is affected by noise, the noise will be jittered near the constellation point of the first carrier information, so a misjudgment will occur on the constellation point of the fourth carrier information. However, after the information is replaced, the off-constellation point will exceed the noise. Jitter.
  • Step 205 Determine a first distance between the corresponding points, and a second distance between adjacent constellation points on the constellation.
  • the third carrier information and the fourth carrier information corresponding point are determined, the corresponding distance is determined, the first distance between the corresponding points is determined, and the second distance between the adjacent constellation points on the constellation is determined.
  • the distance calculation formula is as follows:
  • Y3 is the coordinate of the corresponding point on the third carrier information constellation diagram
  • Y4 is the coordinate of the corresponding point on the fourth carrier information constellation diagram
  • Y is the coordinate corresponding to the first distance
  • R is the distance value of the first distance.
  • Random noise may be included at corresponding points where the constellation points coincide, and random noise and secret information may be included at different corresponding points of the constellation points.
  • the presence of noise causes the vicinity of the constellation point of the first carrier information to be dithered, so misjudgment occurs at the constellation point of the fourth carrier information.
  • the off-constellation point exceeds the jitter of the noise. Therefore, it is possible to determine whether there is hidden information according to the distance between corresponding points.
  • the noise is random Gaussian noise, so the presence of noise makes the vicinity of the constellation point of the first carrier information jitter.
  • Step 206 The receiving device determines whether the first distance is greater than the second distance. If yes, step 207 is performed, and if no, step 208 is performed.
  • the noise since the first carrier information is affected by noise, the noise will be jittered near the constellation point of the first carrier information, so a misjudgment will occur on the constellation point of the fourth carrier information, however, after the information is replaced, the constellation is deviated. The point will exceed the jitter of the noise, so it can be based on the first point between the corresponding points The distance and the second distance between adjacent constellation points are used to judge the secret information.
  • the digital modulation can be QPSK, PSK, QAM.
  • Step 207 The receiving device determines that there is hidden information in the first carrier information, and ends the process.
  • Step 208 The receiving device determines that there is no secret information in the first carrier information.
  • FIG. 3 is a schematic structural diagram of an information detecting apparatus according to an embodiment of the present invention.
  • the information detecting apparatus described in FIG. 3 may be used to perform some or all of the steps in the information detecting method described in FIG. 2 .
  • the information detecting apparatus may include:
  • the receiving unit 101 is configured to receive the first carrier information that is matched by the channel;
  • the processing unit 102 is configured to perform correlation processing on the first carrier information, and sequentially obtain second carrier information, original carrier information, and third carrier information;
  • the processing unit 102 is further configured to perform correlation processing on the second carrier information to obtain fourth carrier information.
  • the comparison determining unit 103 the third carrier information and the fourth carrier information to determine a point corresponding to the third carrier information and the fourth carrier information;
  • Determining unit 104 determining a first distance between the corresponding points, and a second distance between adjacent constellation points on the constellation;
  • a determining unit 105 whether the first distance is greater than a second distance
  • the determining unit 106 is configured to determine that the secret information exists in the first carrier information when the determining unit determines that the first distance is greater than the second distance.
  • the processing unit 102 performs related processing on the first carrier information, and sequentially obtains the second carrier information, the original carrier information, and the third carrier information, including:
  • the original carrier information is remodulated to obtain third carrier information.
  • the processing unit 102 is further configured to perform related processing on the second carrier information, where Obtaining the fourth carrier information includes:
  • the determining unit 106 is further configured to: when the determining unit 105 is further configured to: when the determining unit determines that the first distance is less than or equal to the second distance, determine the first carrier information There is no hidden information in it.
  • the information detecting apparatus described in FIG. 3 is configured to receive the first carrier information after the channel matching, and perform related processing on the first carrier information, and sequentially obtain the second carrier information, the original carrier information, and the third carrier information; And performing correlation processing on the second carrier information to obtain fourth carrier information; the third carrier information and the fourth carrier information to determine a point corresponding to the third carrier information and the fourth carrier information; Determining a first distance between corresponding points and a second distance between adjacent constellation points on the constellation; determining whether the first distance is greater than a second distance; and determining that the first distance is greater than the second distance, determining the first carrier There is hidden information in the information, so that the secret information can be accurately detected.
  • the above-described integrated unit implemented in the form of a software function module can be stored in a computer readable storage medium.
  • the computer readable storage medium can store a computer program, which when executed by the processor, can implement the steps in the foregoing method embodiments.
  • the computer program comprises computer program code, which may be in the form of source code, object code form, executable file or some intermediate form.
  • the computer readable storage medium may include any entity or device capable of carrying the computer program code, a recording medium, a USB flash drive, a removable hard disk, a magnetic disk, an optical disk, a computer memory, a read only memory (ROM, Read-Only Memory). ), random access memory (RAM, Random-Access Memory), electrical carrier signals, telecommunications signals, and software distribution media. It should be noted that the content contained in the computer readable storage medium may be appropriately increased or decreased according to the requirements of legislation and patent practice in a jurisdiction.
  • FIG. 4 is a schematic structural diagram of a receiving device according to an embodiment of the present invention.
  • the receiving device shown in FIG. 4 includes a processor 801 and a memory 802.
  • the processor 801 and the memory 802 are respectively connected to the communication bus.
  • the memory 802 may be a high speed RAM memory or a non-volatile memory.
  • the structure of the receiving device shown in FIG. 4 does not constitute a limitation of the present invention, and it may be a bus-shaped structure or a star-shaped structure, and may include more or less than that shown in FIG. 4. Parts, or combine some parts, or different parts.
  • the processor 801 is a control center of the receiving device, and may be a central processing unit (CPU).
  • the processor 801 connects various parts of the entire receiving device by using various interfaces and lines, and is stored in the memory 802 by running or executing.
  • the performing, by the related processing on the first carrier information, sequentially obtaining the second carrier information, the original carrier information, and the third carrier information includes:
  • the original carrier information is remodulated to obtain third carrier information.
  • the performing, by the related processing on the second carrier information, obtaining the fourth carrier information includes:
  • processor 801 may also call program code stored in the memory 802 for performing the following operations:
  • the first distance is less than or equal to the second distance, determining that there is no secret information in the first carrier information.
  • the receiving device receives the channel-matched first carrier information; performs correlation processing on the first carrier information, and sequentially obtains second carrier information, original carrier information, and third carrier information; Performing correlation processing on the second carrier information to obtain fourth carrier information; comparing the third carrier information with the fourth carrier information to determine a point corresponding to the third carrier information and the fourth carrier information; Determining a first distance between the corresponding points, and a second distance between adjacent constellation points on the constellation; determining whether the first distance is greater than a second distance; if yes, determining that there is a secret in the first carrier information information.
  • the receiving device may perform related processing on the received first carrier information, and sequentially obtain the second carrier information, the original carrier information, and the third carrier information, and further, the first carrier information and the second The carrier information, the original carrier information, and the third carrier information are compared and analyzed to determine that the secret information exists in the first carrier information, so that the secret information can be accurately detected.
  • the disclosed apparatus may be implemented in other ways.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or may be Integrate into another system, or some features can be ignored or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be electrical or otherwise.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.
  • the integrated unit if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable memory. Based on such understanding, the technical solution of the present invention may contribute to the prior art or all or part of the technical solution may be embodied in the form of a software product stored in a memory. A number of instructions are included to cause a computer device (which may be a personal computer, server or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention.
  • the foregoing memory includes: a U disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic disk, or an optical disk, and the like, which can store program codes.
  • ROM Read-Only Memory
  • RAM Random Access Memory

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Abstract

本发明实施例公开一种基于星座点距离的信息检测方法，包括：接收经信道匹配后的第一载体信息；对所述第一载体信息进行相关处理，依次获得第二载体信息、原始载体信息以及第三载体信息；对所述第二载体信息进行相关处理，获得第四载体信息；比较所述第三载体信息与所述第四载体信息，以确定所述第三载体信息与所述第四载体信息对应点；确定所述对应点间的第一距离，以及星座图上相邻星座点间的第二距离；判断所述第一距离是否大于第二距离；若是，则判定所述第一载体信息中存在隐秘信息。本发明能够精确地对隐秘信息进行检测。

Description

基于星座点距离的信息检测方法、装置及接收设备 技术领域
本发明涉及通信技术领域，尤其涉及一种基于星座点距离的信息检测方法、装置及接收设备。
背景技术
替换隐写，是指原始信息在信道编码之后，嵌入隐秘信息，将隐秘信息直接替换原有的部分信息来达到信息隐藏目的。
目前，隐写分析技术中，在针对最低有效位(Least Significant Bit，LSB)隐写的检测方面，卡方检测法是最早的检测算法，其通过定义一个卡方统计量来测试图像存在这种统计特性的概率，实现了对顺序LSB替换的检测，但无法检测随机位置的LSB替换。针对LSB匹配的检测算法基本采用了神经网络、模式识别等方法，对特征集进行训练来提取有效的特征，再通过多个特征的联合判决实现对隐秘信息的检测，但这些方法运算量大、检测结果不够精确，并且具有局限性。
发明内容
本发明实施例公开了一种基于星座点距离的信息检测方法、装置及接收设备，能够精确地对隐秘信息进行检测。
本发明实施例第一方面公开一种基于星座点距离的信息检测方法，包括：
接收经信道匹配后的第一载体信息；
对所述第一载体信息进行相关处理，依次获得第二载体信息、原始载体信息以及第三载体信息；
对所述第二载体信息进行相关处理，获得第四载体信息；
比较所述第三载体信息与所述第四载体信息，以确定所述第三载体信息与所述第四载体信息对应点；
确定所述对应点间的第一距离，以及星座图上相邻星座点间的第二距离；
判断所述第一距离是否大于第二距离；
若是，则判定所述第一载体信息中存在隐秘信息。
作为一种可选的实施方式，在本发明实施例第一方面中，所述对所述第一载体信息进行相关处理，依次获得第二载体信息、原始载体信息以及第三载体信息包括：
对所述第一载体信息进行解调处理，获得第二载体信息；
对所述第二载体信息进行解码以及重新编码处理，获得原始载体信息；
对所述原始载体信息进行重新调制，获得第三载体信息。
作为一种可选的实施方式，在本发明实施例第一方面中，所述对所述第二载体信息进行相关处理，获得第四载体信息包括：
对所述第二载体信息进行重新调制处理，获得第四载体信息。
作为一种可选的实施方式，在本发明实施例第一方面中，所述方法还包括：
若所述第一距离小于或等于所述第二距离，则判定所述第一载体信息中不存在隐秘信息。
本发明实施例第二方面公开一种信息检测装置，包括：
接收单元，用于接收经信道匹配后的第一载体信息；
处理单元，用于对所述第一载体信息进行相关处理，依次获得第二载体信息、原始载体信息以及第三载体信息；
所述处理单元，还用于对所述第二载体信息进行相关处理，获得第四载体信息；
比较确定单元，所述第三载体信息与所述第四载体信息，以确定所述第三载体信息与所述第四载体信息对应点；
确定单元，确定所述对应点间的第一距离，以及星座图上相邻星座点间的第二距离；
判断单元，所述第一距离是否大于第二距离；
判定单元，用于当所述判断单元判断所述第一距离大于第二距离时，判定所述第一载体信息中存在隐秘信息。
作为一种可选的实施方式，在本发明实施例第二方面中，所述处理单元 对所述第一载体信息进行相关处理，依次获得第二载体信息、原始载体信息以及第三载体信息包括：
对所述第一载体信息进行解调处理，获得第二载体信息；
对所述第二载体信息进行解码以及重新编码处理，获得原始载体信息；
对所述原始载体信息进行重新调制，获得第三载体信息。
作为一种可选的实施方式，在本发明实施例第二方面中，所述处理单元还用于对所述第二载体信息进行相关处理，获得第四载体信息包括：
对所述第二载体信息进行重新调制处理，获得第四载体信息。
作为一种可选的实施方式，在本发明实施例第二方面中，所述判定单元，还用于当所述判断单元判断所述第一距离小于或等于所述第二距离，则判定所述第一载体信息中不存在隐秘信息。
本发明实施例第三方面公开一种接收设备，所述接收设备包括处理器和存储器，所述处理器执行所述存储器存储的计算机程序以实现上述第一方面任一项所述的基于星座点距离的信息检测方法。
一种计算机可读存储介质，所述计算机可读存储介质存储有至少一个指令，所述至少一个指令被处理器执行时实现上述第一方面任一项所述的基于星座点距离的信息检测方法。
与现有技术相比，本发明实施例具备以下有益效果：
本发明实施例中，接收设备可以接收经信道匹配后的第一载体信息；对所述第一载体信息进行相关处理，依次获得第二载体信息、原始载体信息以及第三载体信息；对所述第二载体信息进行相关处理，获得第四载体信息；比较所述第三载体信息与所述第四载体信息，以确定所述第三载体信息与所述第四载体信息对应点；确定所述对应点间的第一距离，以及星座图上相邻星座点间的第二距离；判断所述第一距离是否大于第二距离；若是，则判定所述第一载体信息中存在隐秘信息。可见，实施本发明实施例，接收设备可以对接收到的第一载体信息进行相关处理，依次获得第二载体信息、原始载体信息以及第三载体信息，并且接收设备可以对第二载体信息进行相关处理，获得第四载体信息，进一步地，对第四载体信息以及第三载体信息进行比较 分析并判断，以判定所述第一载体信息中存在隐秘信息，从而能够精确地对隐秘信息进行检测。
附图说明
为了更清楚地说明本发明实施例中的技术方案，下面将对实施例中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是本发明实施例公开的一种替换隐写的通信模型图；
图2是本发明实施例公开的一种基于星座点距离的信息检测方法的流程示意图；
图3是本发明实施例公开的一种信息检测装置的结构示意图；
图4是本发明实施例公开的一种接收设备的结构示意图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
需要说明的是，本发明的说明书和权利要求书及上述附图中的术语“第一”、“第二”、“第三”和“第四”等是用于区别不同对象，而不是用于描述特定顺序。此外，术语“包括”和“具有”以及它们任何变形，意图在于覆盖不排他的包含。例如包含了一系列步骤或单元的过程、方法、***、产品或设备没有限定于已列出的步骤或单元，而是可选地还包括没有列出的步骤或单元，或可选地还包括对于这些过程、方法、产品或设备固有的其它步骤或单元。
本发明实施例公开了一种基于星座点距离的信息检测方法、装置及接收设备，能够精确地对隐秘信息进行检测。以下进行结合附图进行详细描述。
请参阅图1，图1是本发明实施例公开的一种替换隐写的通信模型图。如图1所示，该替换隐写的通信模型可以包括两个过程：发送过程和接收过程。
其中，发送过程主要由发送设备来执行。其中，发送设备可以包括基站或用户设备。基站(例如接入点)可以是指接入网中在空中接口上通过一个或多个扇区与无线终端通信的设备。基站可用于将收到的空中帧与IP分组进行相互转换，作为无线终端与接入网的其余部分之间的路由器，其中，接入网的其余部分可包括网际协议(IP)网络。基站还可以协调对空中接口的属性管理。例如，基站可以是GSM或CDMA中的基站(BTS，Base Transceiver Station)，也可以是WCDMA中的基站(NodeB)，还可以是LTE中的演进型基站(NodeB或eNB或e-NodeB，evolutional Node B)，本发明实施例不做限定。用户设备可以包括但不限于智能手机、笔记本电脑、个人计算机(Personal Computer，PC)、个人数字助理(Personal Digital Assistant,PDA)、移动互联网设备(Mobile Internet Device，MID)、穿戴设备(如智能手表、智能手环、智能眼镜)等各类电子设备，其中，该用户设备的操作***可包括但不限于Android操作***、IOS操作***、Symbian(塞班)操作***、Black Berry(黑莓)操作***、Windows Phone8操作***等等，本发明实施例不做限定。
在发送过程中，发送设备分为两路，一路是载体信息经过编码，另一路是隐秘信息经过编码，二者编码后，再将隐秘信息嵌入到载体信息中，进行调制，再送入信道，经信道发送给接收设备。
其中，接收过程主要由接收设备来执行。其中，接收设备可以包括基站或用户设备。基站(例如接入点)可以是指接入网中在空中接口上通过一个或多个扇区与无线终端通信的设备。基站可用于将收到的空中帧与IP分组进行相互转换，作为无线终端与接入网的其余部分之间的路由器，其中，接入网的其余部分可包括网际协议(IP)网络。基站还可以协调对空中接口的属性管理。例如，基站可以是GSM或CDMA中的基站(BTS，Base Transceiver  Station)，也可以是WCDMA中的基站(NodeB)，还可以是LTE中的演进型基站(NodeB或eNB或e-NodeB，evolutional Node B)，本发明实施例不做限定。用户设备可以包括但不限于智能手机、笔记本电脑、个人计算机(Personal Computer，PC)、个人数字助理(Personal Digital Assistant,PDA)、移动互联网设备(Mobile Internet Device，MID)、穿戴设备(如智能手表、智能手环、智能眼镜)等各类电子设备，其中，该用户设备的操作***可包括但不限于Android操作***、IOS操作***、Symbian(塞班)操作***、Black Berry(黑莓)操作***、Windows Phone8操作***等等，本发明实施例不做限定。
在接收过程中，接收设备对接收到的信号解调后，先对解调后的进行提取然后解码，以获得隐秘信息，再对提取隐秘信息之后的信号进行解码，以获取载体信息。
具体的，隐秘信息的具体嵌入方式可以以二进制相移键控(BINARY PHASE SHIFT KEYING，BPSK)为例说明，载体信息经过编码后变成0、1序列，隐秘信息编码后也是0、1序列，则隐秘信息可以随机替换载体信息的某些位置而进行信息的隐藏，此时，载体信息的0可以被隐秘信息的1替换，载体信息的1可以被隐秘信息的0替换，经过BPSK也就是-1变1，1变-1。当然，为了确保后续能够恢复原始载体信息，隐秘信息的位数需要小于载体信息的纠错能力所能纠错的位数。举例来说，假设编码后信息位有k位，总共n个码元，那么能纠错的位数
Figure PCTCN2017111216-appb-000001
取整数，所以，隐秘信息的位数要小于t，才能进行替换隐写。
请参阅图2，图2是本发明实施例公开的一种基于星座点距离的信息检测方法的流程示意图。如图2所示，该基于星座点距离的信息检测方法可以包括以下步骤：
步骤201、接收设备接收经信道匹配后的第一载体信息。
替换隐写，是指原始信息在信道编码之后，嵌入隐秘信息，将隐秘信息 直接替换原有的部分信息来达到信息隐藏目的。
本发明中，发送设备将替换隐写后的载体信息经信道发送出去，接收设备就可以经信道匹配后获得该第一载体信息，其中，该第一载体信息为经过编码调制后的信息。
其中，信道匹配的公式如下：
Figure PCTCN2017111216-appb-000002
其中，Y为乘了信道H之后的载体信息，conj(H)为H的共轭，Y1为第一载体信息。
步骤202、接收设备对所述第一载体信息进行相关处理，依次获得第二载体信息、原始载体信息以及第三载体信息。
具体的，接收设备对所述第一载体信息进行相关处理，依次获得第二载体信息、原始载体信息以及第三载体信息的方式具体可以为：
对所述第一载体信息进行解调处理，获得第二载体信息；
对所述第二载体信息进行解码以及重新编码处理，获得原始载体信息；
对所述原始载体信息进行重新调制，获得第三载体信息。
本发明中，对所述第二载体信息进行解码，就可以把第二载体信息中可能隐藏的隐秘信息给抹掉，重新编码后，就可以获得原始载体信息。其中，第一载体信息可能包括隐秘信息，而第三载体信息不包括隐秘信息。
步骤203、接收设备对所述第二载体信息进行相关处理，获得第四载体信息。
具体的，接收设备对对所述第二载体信息进行重新调制处理，获得第四载体信息。优选地，调制方式为数字调制。
本发明中，对所述第二载体信息进行解码，就可以把第二载体信息中可能隐藏的隐秘信息给抹掉，故对所述第二载体信息进行重新调制处理得到第四载体信息，同第二载体信息一样第四载体信息中可能隐藏的隐秘信息。
步骤204、接收设备比较所述第三载体信息与所述第四载体信息，以确定所述第三载体信息与所述第四载体信息对应点。
第三载体信息是由原始载体信息经过数字调制得到的，第四载体信息是由第二载体信息经过数字调制得到的，故第三载体信息和第四载体信息均可用星座图表示。
其中，第四载体信息是由第二载体信息经过数字调制得到的，而第二载体信息经过第一载体信息解调得到的。由于第一载体信息会受噪声影响，噪声会在第一载体信息的星座点附近抖动，所以第四载体信息的星座点上会发生误判，然而，信息发生替换后，偏离星座点会超过噪声的抖动。
步骤205、确定所述对应点间的第一距离，以及星座图上相邻星座点间的第二距离。
通常，确定第三载体信息与第四载体信息对应点，找出对应点后确定对应点间的第一距离，另外确定星座图上相邻星座点间的第二距离。
其中，距离计算公式如下：
Y＝Y3-Y4
Figure PCTCN2017111216-appb-000003
其中，Y3是第三载体信息星座图上的对应点坐标，Y4是第四载体信息星座图上的对应点坐标，Y是第一距离对应的坐标，R是第一距离的距离值。
在星座点一致的对应点处可能包括随机的噪声，而在星座点不同的对应点处可能包括随机的噪声和隐秘信息。噪音的存在使得第一载体信息的星座点附近抖动，所以第四载体信息的星座点上会发生误判，然而，信息发生替换后，偏离星座点会超过噪声的抖动。因而可以根据对应点间的距离判断是否存在隐秘信息
其中，噪声为随机的高斯噪声，故噪音的存在使得第一载体信息的星座点附近抖动。
步骤206、接收设备判断所述第一距离是否大于第二距离，若是，执行步骤207，若否，执行步骤208。
本发明中，由于第一载体信息会受噪声影响，噪声会在第一载体信息的星座点附近抖动，所以第四载体信息的星座点上会发生误判，然而，信息发生替换后，偏离星座点会超过噪声的抖动，因而，可以根据对应点间的第一 距离，以及相邻星座点间的第二距离进行隐秘信息的判断。
其中，数字调制可以是QPSK、PSK、QAM。
步骤207、接收设备判定所述第一载体信息中存在隐秘信息，并结束本流程。
步骤208、接收设备判定所述第一载体信息中不存在隐秘信息。
请参阅图3，图3是本发明实施例公开的一种信息检测装置的结构示意图。其中，图3所描述的信息检测装置可以用于执行图2所描述的信息检测方法中的部分或全部步骤，具体请参见图2中的相关描述，在此不再赘述。如图3所示，该信息检测装置可以包括：
接收单元101，用于接收经信道匹配后的第一载体信息；
处理单元102，用于对所述第一载体信息进行相关处理，依次获得第二载体信息、原始载体信息以及第三载体信息；
所述处理单元102，还用于对所述第二载体信息进行相关处理，获得第四载体信息；
比较确定单元103，所述第三载体信息与所述第四载体信息，以确定所述第三载体信息与所述第四载体信息对应点；
确定单元104，确定所述对应点间的第一距离，以及星座图上相邻星座点间的第二距离；
判断单元105，所述第一距离是否大于第二距离；
判定单元106，用于当所述判断单元判断所述第一距离大于第二距离时，判定所述第一载体信息中存在隐秘信息。
可选的，所述处理单元102对所述第一载体信息进行相关处理，依次获得第二载体信息、原始载体信息以及第三载体信息包括：
对所述第一载体信息进行解调处理，获得第二载体信息；
对所述第二载体信息进行解码以及重新编码处理，获得原始载体信息；
对所述原始载体信息进行重新调制，获得第三载体信息。
可选的，所述处理单元102还还用于对所述第二载体信息进行相关处理， 获得第四载体信息包括：
对所述第二载体信息进行重新调制处理，获得第四载体信息。
可选的，所述判定单元106，还用于当所述判断单元105还用于当所述判断单元判断所述第一距离小于或等于所述第二距离，则判定所述第一载体信息中不存在隐秘信息。
其中，实施图3所描述的信息检测装置，接收经信道匹配后的第一载体信息；对所述第一载体信息进行相关处理，依次获得第二载体信息、原始载体信息以及第三载体信息；还对第二载体信息进行相关处理，获得第四载体信息；所述第三载体信息与所述第四载体信息，以确定所述第三载体信息与所述第四载体信息对应点；确定所述对应点间的第一距离，以及星座图上相邻星座点间的第二距离；判断所述第一距离是否大于第二距离；当判断第一距离大于第二距离时，判定第一载体信息中存在隐秘信息，从而能够精确地对隐秘信息进行检测。
上述以软件功能模块的形式实现的集成的单元，可以存储在一个计算机可读存储介质中。其中，该计算机可读存储介质可以存储计算机程序，该计算机程序在被处理器执行时，可实现上述各个方法实施例中的步骤。其中，该计算机程序包括计算机程序代码，所述计算机程序代码可以为源代码形式、对象代码形式、可执行文件或某些中间形式等。所述计算机可读存储介质可以包括：能够携带所述计算机程序代码的任何实体或装置、记录介质、U盘、移动硬盘、磁碟、光盘、计算机存储器、只读存储器(ROM，Read-Only Memory)、随机存取存储器(RAM，Random-Access Memory)、电载波信号、电信信号以及软件分发介质等。需要说明的是，所述计算机可读存储介质包含的内容可以根据司法管辖区内立法和专利实践的要求进行适当的增减。
请参阅图4，图4是本发明实施例公开的一种接收设备的结构示意图。其中，图4所示的接收设备包括处理器801和存储器802。其中，所述处理器801以及存储器802分别连接通信总线。存储器802可以是高速RAM存储器，也可以是非易失性的存储器(non-volatile memory)。本领域技术人员 可以理解，图4中示出的接收设备的结构并不构成对本发明的限定，它既可以是总线形结构，也可以是星型结构，还可以包括比图4所示的更多或更少的部件，或者组合某些部件，或者不同的部件布置。
其中，处理器801为接收设备的控制中心，可以是中央处理器(Central Processing Unit，CPU)，处理器801利用各种接口和线路连接整个接收设备的各个部分，通过运行或执行存储在存储器802内的软件程序和/或模块，以及调用存储在存储器802内存储的程序代码，用于执行以下操作：
接收经信道匹配后的第一载体信息；
对所述第一载体信息进行相关处理，依次获得第二载体信息、原始载体信息以及第三载体信息；
对所述第二载体信息进行相关处理，获得第四载体信息；
比较所述第三载体信息与所述第四载体信息，以确定所述第三载体信息与所述第四载体信息对应点；
确定所述对应点间的第一距离，以及星座图上相邻星座点间的第二距离；
判断所述第一距离是否大于第二距离；
若是，则判定所述第一载体信息中存在隐秘信息。
作为一种可选的实施方式，所述对所述第一载体信息进行相关处理，依次获得第二载体信息、原始载体信息以及第三载体信息包括：
对所述第一载体信息进行解调处理，获得第二载体信息；
对所述第二载体信息进行解码以及重新编码处理，获得原始载体信息；
对所述原始载体信息进行重新调制，获得第三载体信息。
作为一种可选的实施方式，所述对所述第二载体信息进行相关处理，获得第四载体信息包括：
对所述第二载体信息进行重新调制处理，获得第四载体信息。
作为一种可选的实施方式，所述处理器801还可以调用存储在存储器802内存储的程序代码，用于执行以下操作：
若所述第一距离小于或等于所述第二距离，则判定所述第一载体信息中不存在隐秘信息。
在图4所描述的接收设备中，接收设备接收经信道匹配后的第一载体信息；对所述第一载体信息进行相关处理，依次获得第二载体信息、原始载体信息以及第三载体信息；对所述第二载体信息进行相关处理，获得第四载体信息；比较所述第三载体信息与所述第四载体信息，以确定所述第三载体信息与所述第四载体信息对应点；确定所述对应点间的第一距离，以及星座图上相邻星座点间的第二距离；判断所述第一距离是否大于第二距离；若是，则判定所述第一载体信息中存在隐秘信息。可见，实施本发明实施例，接收设备可以对接收到的第一载体信息进行相关处理，依次获得第二载体信息、原始载体信息以及第三载体信息，进一步地，对第一载体信息、第二载体信息、原始载体信息以及第三载体信息进行比较分析并判断，以判定所述第一载体信息中存在隐秘信息，从而能够精确地对隐秘信息进行检测。
在上述实施例中，对各个实施例的描述都各有侧重，某个实施例中没有详述的部分，可以参见其他实施例的相关描述。
在本申请所提供的几个实施例中，应该理解到，所揭露的装置，可通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个***，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本发明各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。上述集成的单元既可以采用硬件的形式实现，也可以采用软件功能单元的形式实现。
所述集成的单元如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储器中。基于这样的理解，本发明的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的全部或部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储器中，包括若干指令用以使得一台计算机设备(可为个人计算机、服务器或者网络设备等)执行本发明各个实施例所述方法的全部或部分步骤。而前述的存储器包括：U盘、只读存储器(ROM，Read-Only Memory)、随机存取存储器(RAM，Random Access Memory)、移动硬盘、磁碟或者光盘等各种可以存储程序代码的介质。
本领域普通技术人员可以理解上述实施例的各种方法中的全部或部分步骤是可以通过程序来指令相关的硬件来完成，该程序可以存储于一计算机可读存储器中，存储器可以包括：闪存盘、只读存储器(英文：Read-Only Memory，简称：ROM)、随机存取器(英文：Random Access Memory，简称：RAM)、磁盘或光盘等。
以上对本发明实施例公开的一种基于星座点距离的信息检测方法、装置及接收设备进行了详细介绍，本文中应用了具体个例对本发明的原理及实施方式进行了阐述，以上实施例的说明只是用于帮助理解本发明的方法及其核心思想；同时，对于本领域的一般技术人员，依据本发明的思想，在具体实施方式及应用范围上均会有改变之处，综上所述，本说明书内容不应理解为对本发明的限制。

Claims (10)

  1. 一种基于星座点距离的信息检测方法，其特征在于，包括：
    接收经信道匹配后的第一载体信息；
    对所述第一载体信息进行相关处理，依次获得第二载体信息、原始载体信息以及第三载体信息；
    对所述第二载体信息进行相关处理，获得第四载体信息；
    比较所述第三载体信息与所述第四载体信息，以确定所述第三载体信息与所述第四载体信息对应点；
    确定所述对应点的第一距离，以及星座图上相邻星座点间的第二距离；
    判断所述第一距离是否大于第二距离；
    若是，则判定所述第一载体信息中存在隐秘信息。
  2. 根据权利要求1所述的方法，其特征在于，所述对所述第一载体信息进行相关处理，依次获得第二载体信息、原始载体信息以及第三载体信息包括：
    对所述第一载体信息进行解调处理，获得第二载体信息；
    对所述第二载体信息进行解码以及重新编码处理，获得原始载体信息；
    对所述原始载体信息进行重新调制，获得第三载体信息。
  3. 根据权利要求2所述的方法，其特征在于，所述对所述第二载体信息进行相关处理，获得第四载体信息包括：
    对所述第二载体信息进行重新调制处理，获得第四载体信息。
  4. 根据权利要求3所述的方法，其特征在于，所述方法还包括：
    若所述第一距离小于或等于所述第二距离，则判定所述第一载体信息中不存在隐秘信息。
  5. 一种信息检测装置，其特征在于，包括：
    接收单元，用于接收经信道匹配后的第一载体信息；
    处理单元，用于对所述第一载体信息进行相关处理，依次获得第二载体信息、原始载体信息以及第三载体信息；
    所述处理单元，还用于对所述第二载体信息进行相关处理，获得第四载体信息；
    比较确定单元，所述第三载体信息与所述第四载体信息，以确定所述第三载体信息与所述第四载体信息对应点；
    确定单元，确定所述对应点间的第一距离，以及星座图上相邻星座点间的第二距离；
    判断单元，所述第一距离是否大于第二距离；
    判定单元，用于当所述判断单元判断所述第一距离大于第二距离时，判定所述第一载体信息中存在隐秘信息。
  6. 根据权利要求5所述的信息检测装置，其特征在于，所述处理单元对所述第一载体信息进行相关处理，依次获得第二载体信息、原始载体信息以及第三载体信息包括：
    对所述第一载体信息进行解调处理，获得第二载体信息；
    对所述第二载体信息进行解码以及重新编码处理，获得原始载体信息；
    对所述原始载体信息进行重新调制，获得第三载体信息。
  7. 根据权利要求6所述的信息检测装置，其特征在于，所述处理单元还用于对所述第二载体信息进行相关处理，获得第四载体信息包括：
    对所述第二载体信息进行重新调制处理，获得第四载体信息。
  8. 根据权利要求7所述的信息检测装置，其特征在于，所述判定单元，还用于当所述判断单元判断所述第一距离小于或等于所述第二距离，则判定所述第一载体信息中不存在隐秘信息。
  9. 一种接收设备，其特征在于，所述接收设备包括处理器和存储器，所 述处理器执行所述存储器存储的计算机程序以实现如权利要求1至4任一项所述的信息检测方法。
  10. 一种计算机可读存储介质，其特征在于，所述计算机可读存储介质存储有至少一个指令，所述至少一个指令被处理器执行时实现如权利要求1至4任一项所述的信息检测方法。
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101465934A (zh) * 2007-12-20 2009-06-24 佳能株式会社 星座图检测
CN102355359A (zh) * 2011-07-15 2012-02-15 华南理工大学 在调制星座图中隐藏秘信息的方法
US20150286873A1 (en) * 2014-04-03 2015-10-08 Bruce L. Davis Smartphone-based methods and systems

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101465934A (zh) * 2007-12-20 2009-06-24 佳能株式会社 星座图检测
CN102355359A (zh) * 2011-07-15 2012-02-15 华南理工大学 在调制星座图中隐藏秘信息的方法
US20150286873A1 (en) * 2014-04-03 2015-10-08 Bruce L. Davis Smartphone-based methods and systems

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