CN112950446A - Digital watermark adding method and analysis method for vehicle-mounted camera multimedia resource - Google Patents
Digital watermark adding method and analysis method for vehicle-mounted camera multimedia resource Download PDFInfo
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- CN112950446A CN112950446A CN202110281318.1A CN202110281318A CN112950446A CN 112950446 A CN112950446 A CN 112950446A CN 202110281318 A CN202110281318 A CN 202110281318A CN 112950446 A CN112950446 A CN 112950446A
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- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000004458 analytical method Methods 0.000 title abstract description 7
- 238000004590 computer program Methods 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 238000007405 data analysis Methods 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims 1
- 230000000007 visual effect Effects 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 8
- 238000012545 processing Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000013507 mapping Methods 0.000 description 2
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T1/00—General purpose image data processing
- G06T1/0021—Image watermarking
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2201/00—General purpose image data processing
- G06T2201/005—Image watermarking
- G06T2201/0065—Extraction of an embedded watermark; Reliable detection
Abstract
The invention provides a digital watermark adding method and an analysis method for vehicle-mounted camera multimedia resources. The digital watermark adding method for the vehicle-mounted camera multimedia resource comprises the following steps: generating a digital watermark according to the identification information of the vehicle-mounted camera generating the multimedia resource; wherein the digital watermark comprises text content and/or image content; and embedding the digital watermark into the multimedia resource so as to form the final multimedia resource containing the watermark. The invention introduces the digital watermark technology into the application of the vehicle-mounted camera, adds the hidden digital watermark to the multimedia resource under the condition of not influencing the visual effect of the original multimedia resource, and can acquire the information of the vehicle-mounted camera, the generation time, the location and the like of the multimedia resource by analyzing the digital watermark.
Description
Technical Field
The invention relates to the technical field of vehicle-mounted cameras, in particular to a digital watermark adding method, an analysis method and a device of multimedia resources of a vehicle-mounted camera, so that a digital watermark technology is introduced into the application of the vehicle-mounted camera.
Background
With the popularization of electric intelligent driving vehicles, the vehicles can collect a large amount of regional video contents, and regional geographic information can be reversely constructed to obtain mapping results by knowing geographic positions and geographic environment images contained in videos, so that the video resources need to be controlled intensively, the resources are prevented from being transmitted abroad, and an organization without mapping qualification utilizes the contents to process and calculate the geographic information. Based on the method, the method for embedding the watermark into the multimedia resource is provided, so that the technical condition of tracing can be detected.
Disclosure of Invention
In view of the above-mentioned shortcomings in the prior art, an object of the present invention is to provide a method for adding and parsing a digital watermark to a multimedia resource of a vehicle-mounted camera, which is used to solve the above shortcomings in the prior art.
In order to achieve the above and other related objects, the present invention provides a method for adding digital watermarks to multimedia resources of a vehicle-mounted camera, comprising: generating a digital watermark according to the identification information of the vehicle-mounted camera generating the multimedia resource; wherein the digital watermark comprises text content and/or image content; and embedding the digital watermark into the multimedia resource so as to form the final multimedia resource containing the watermark.
In an embodiment of the present invention, the method further includes: and generating the digital watermark according to the identification information of the vehicle-mounted camera generating the multimedia resource, the generation time information and the location information of the multimedia resource.
In an embodiment of the present invention, the text content of the digital watermark includes: generating a plaintext or ciphertext according to the identification information of the vehicle-mounted camera, the generation time information of the multimedia resource and the location information; the image content of the digital watermark comprises: and generating a picture according to the identification information of the vehicle-mounted camera, the generation time information and the location information of the multimedia resource, or generating a specific picture corresponding to the vehicle-mounted camera.
In an embodiment of the present invention, the identification information includes: the vehicle-mounted camera comprises vehicle-mounted camera information, equipment model information and equipment serial number information.
In an embodiment of the present invention, the embedding the digital watermark into the multimedia resource includes: selecting at least one frame of target image of the multimedia resource, and converting the spatial domain data of the at least one frame of target image into frequency domain data; and superposing the digital watermark to the frequency domain data of the at least one frame of target image, and converting the superposed frequency domain data into spatial domain data, thereby forming at least one frame of target image containing the watermark so as to form the final multimedia resource containing the watermark.
In order to achieve the above and other related objects, the present invention provides a method for analyzing digital watermark of multimedia resource of vehicle-mounted camera, comprising: acquiring a multimedia resource containing a watermark, and identifying at least one frame of target image containing the watermark from the multimedia resource; converting the spatial domain data of the at least one frame of target image into frequency domain data, and extracting data of a digital watermark from the frequency domain data; and decoding the data of the digital watermark so as to obtain the information contained in the digital watermark.
In order to achieve the above and other related objects, the present invention provides a digital watermark adding apparatus for multimedia resources of a vehicle-mounted camera, including: the digital watermark generating module is used for generating a digital watermark according to the identification information of the vehicle-mounted camera generating the multimedia resource; wherein the digital watermark comprises text content and/or image content; and the digital watermark embedding module is used for embedding the digital watermark into the multimedia resource so as to form the final multimedia resource containing the watermark.
In order to achieve the above and other related objects, the present invention provides a digital watermark analyzing apparatus for multimedia resources of a vehicle-mounted camera, comprising: the multimedia resource acquisition module is used for acquiring the multimedia resource containing the watermark and identifying at least one frame of target image containing the watermark from the multimedia resource; the multimedia data conversion module is used for converting the spatial domain data of the at least one frame of target image into frequency domain data and extracting data of the digital watermark from the frequency domain data; and the watermark data analysis module is used for decoding the data of the digital watermark so as to obtain the information contained in the digital watermark.
To achieve the above and other related objects, the present invention provides a computer-readable storage medium in which a computer program is stored, which, when being loaded and executed by a processor, implements any of the methods described herein.
To achieve the above and other related objects, the present invention provides an electronic device, comprising: a processor and a memory; wherein the memory is for storing a computer program; the processor is configured to load and execute the computer program to cause the electronic device to perform any of the methods.
As described above, the digital watermark adding method and the analysis method for the vehicle-mounted camera multimedia resource of the invention generate the digital watermark according to the identification information of the vehicle-mounted camera generating the multimedia resource; wherein the digital watermark comprises text content and/or image content; and embedding the digital watermark into the multimedia resource so as to form the final multimedia resource containing the watermark. The invention firstly proposes to introduce the digital watermark technology into the application of the vehicle-mounted camera, adds the hidden digital watermark to the multimedia resource under the condition of not influencing the visual effect of the original multimedia resource, and can acquire the information of the vehicle-mounted camera generating the multimedia resource, the generation time, the generation place and the like by analyzing the digital watermark.
Drawings
Fig. 1 is a schematic diagram of a vehicle-mounted camera for generating multimedia resources in the prior art.
Fig. 2 is a schematic diagram illustrating a method for adding a digital watermark to a multimedia resource of a vehicle-mounted camera according to an embodiment of the present invention.
Fig. 3 is a schematic diagram illustrating a principle of embedding a digital watermark into a multimedia resource of a vehicle-mounted camera according to an embodiment of the present invention.
Fig. 4 is a schematic diagram illustrating a principle of a digital watermark analyzing method for a multimedia resource of a vehicle-mounted camera according to an embodiment of the present invention.
Fig. 5 is a schematic block diagram of a digital watermarking apparatus for vehicle-mounted camera multimedia resources according to an embodiment of the present invention.
Fig. 6 is a schematic block diagram of a digital watermark analyzing apparatus for a vehicle-mounted camera multimedia resource according to an embodiment of the present invention.
Fig. 7 is a schematic structural diagram of an electronic device according to an embodiment of the invention.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the drawings only show the components related to the present invention rather than the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.
In view of the problem that multimedia digital files (i.e., multimedia resources) generated by shooting with a vehicle-mounted camera in the prior art are difficult to be detected by tracing, the present application provides a digital watermark adding method and an analysis method for multimedia resources of a vehicle-mounted camera.
Fig. 1 is a schematic diagram of a vehicle-mounted camera generating a multimedia resource in the prior art, where the vehicle-mounted camera directly outputs the multimedia resource and cannot be traced due to no digital watermark being added.
As shown in fig. 2, the present embodiment provides a method for adding a digital watermark to a multimedia resource of a vehicle-mounted camera, which adds a digital watermark to the multimedia resource generated by the vehicle-mounted camera to output a multimedia resource that can be traced finally.
The digital watermark adding method for the vehicle-mounted camera multimedia resource comprises the following steps:
s21: generating a digital watermark according to the identification information of the vehicle-mounted camera generating the multimedia resource;
wherein the digital watermark comprises text content and/or image content.
For the characters of the digital watermark, the characters can be plain texts according to the identification information of the vehicle-mounted camera generating the multimedia resource, and can also be cipher texts generated by the plain texts through an encryption algorithm.
The identification information may be one or a combination of several of manufacturer information, equipment model information, and equipment serial number information of the vehicle-mounted camera. Taking the manufacturer information of "00", the device model information of "ab", and the device serial number information of "1234" as examples, the digital watermark may be a plaintext of "00 ab 1234", or a ciphertext "abd 051a749ddf1c29c6554702775c2331d 661302" calculated by sha1 encryption algorithm. It should be noted that the identification information and the encryption algorithm in the examples are only examples, and should not be considered as limiting the scope of the present application.
Preferably, in an embodiment, the step generates the digital watermark not only according to the identification information of the vehicle-mounted camera, but also according to the identification information of the vehicle-mounted camera, the generation time information of the multimedia resource, and the location information. The time information generated by the multimedia resources is 2020-01-01-01:30, and the location information generated by the multimedia resources can adopt Beidou positioning information, GPS positioning information and the like. Similarly, the plaintext of the three parties may be used as the digital watermark, or the plaintext of the three parties may be encrypted and used as the digital watermark. It should be noted that, those skilled in the art may also select other information related to the production information of the multimedia resource corresponding to the identity of the vehicle-mounted camera to generate the digital watermark, and is not limited to the embodiment.
For the image of the digital watermark, it may be a picture generated according to the identification information of the vehicle-mounted camera, the generation time information of the multimedia resource, and the location information, such as: the coded two-dimensional code image and other images which can be restored reversely can also be specific pictures corresponding to the vehicle-mounted camera, such as: and the specific picture corresponds to the identity mark of the vehicle-mounted camera in advance.
It is worth to be noted that the digital watermark in the form of an image has stronger capability of resisting various transformations compared with the digital watermark in the form of characters, so that the digital watermark in the form of an image has stronger robustness and better security.
S22: and embedding the digital watermark into the multimedia resource so as to form the final multimedia resource containing the watermark.
In detail, as shown in fig. 3, in this step, at least one frame of target image of the multimedia resource is selected first, and which frames are specifically selected can be determined according to actual conditions, which is not limited in the present application; then, the spatial domain data of the at least one frame of target image is converted into frequency domain data, the conversion algorithm can adopt Fourier transform, wavelet transform, discrete cosine transform or other transformation modes, and the conversion from the spatial domain to the frequency domain is not introduced herein because of the prior art means; thirdly, the digital watermark is superposed on the frequency domain data of the at least one frame of target image, namely the digital watermark information needing to be inserted is written into the at least one frame of target image, and the superposed frequency domain data is converted into spatial domain data by correspondingly utilizing an inverse Fourier transform, an inverse wavelet transform, an inverse discrete cosine transform or other corresponding inverse transform modes; and finally, encoding to form the final multimedia resource containing the watermark by utilizing the at least one frame of target image containing the watermark. Wherein, the encoding process can be added with encryption measures, such as symmetric encryption AES, or asymmetric encryption RSA, etc.
It should be noted that, by superimposing the digital watermark on the frequency domain data of the at least one frame of target image, the digital watermark can be invisible to people, so that the digital watermark is hidden in the multimedia resource, the visual effect of the original multimedia resource is not affected, and meanwhile, the attack of partial image processing can be resisted. Compared with a spatial domain method, the frequency domain watermark adding method has stronger hiding performance and stronger attack resistance, and because the opposite side is difficult to know the frequency band to which the watermark is added, the watermark is difficult to analyze, and the original content of the image is often damaged by forced attack, so the robustness is high and the safety is better.
By the method for adding the digital watermark to the multimedia resource of the vehicle-mounted camera, the digital watermark is invisibly added to the multimedia resource generated by the vehicle-mounted camera, so that the vehicle-mounted camera outputs the multimedia resource with the watermark without influencing the visual viewing effect of the multimedia resource.
In addition, the application also provides a digital watermark analyzing method for the vehicle-mounted camera multimedia resource, which is used for analyzing the multimedia resource with the watermark output by the vehicle-mounted camera, so as to analyze the content contained in the digital watermark, and further know which vehicle-mounted camera generates the multimedia resource and the information of the generated time, place and the like.
As shown in fig. 4, the method for analyzing digital watermark of multimedia resource of vehicle-mounted camera in this embodiment includes the following steps:
s41: acquiring a multimedia resource containing a watermark, and identifying at least one frame of target image containing the watermark from the multimedia resource;
for example: continuously extracting a section of video in the multimedia resource, analyzing each frame of video respectively, and analyzing at least one frame of image with the digital watermark to serve as the target image;
s42: converting the spatial domain data of the at least one frame of target image into frequency domain data, and extracting data of a digital watermark from the frequency domain data;
it should be noted that the method for extracting the watermark in this step may adopt the existing mature technology, and how to extract the watermark is not the main point of the present application, so the description is not provided herein.
S43: and decoding the data of the digital watermark so as to obtain the information contained in the digital watermark.
Referring to fig. 5, the present embodiment provides a digital watermarking apparatus 50 for a vehicle-mounted camera multimedia resource, and since the technical principle of the present embodiment is similar to that of the foregoing embodiment of the digital watermarking method for a vehicle-mounted camera multimedia resource, repeated description of the same technical details is not repeated. The apparatus 50 of the present embodiment includes the following modules:
a digital watermark generating module 51, configured to generate a digital watermark according to identification information of a vehicle-mounted camera that generates the multimedia resource; wherein the digital watermark comprises text content and/or image content; or generating the digital watermark according to the identification information of the vehicle-mounted camera generating the multimedia resource, the generation time information and the location information of the multimedia resource;
a digital watermark embedding module 52, configured to embed the digital watermark in the multimedia asset, so as to form a final multimedia asset containing the watermark.
Referring to fig. 6, the present embodiment provides a digital watermark analyzing apparatus 60 for a vehicle-mounted camera multimedia resource, and since the technical principle of the present embodiment is similar to that of the foregoing embodiment of the digital watermark analyzing method for a vehicle-mounted camera multimedia resource, repeated description of the same technical details is not repeated. The apparatus 60 of the present embodiment includes the following modules:
the multimedia resource acquisition module 61 is configured to acquire a multimedia resource containing a watermark and identify at least one frame of target image containing the watermark;
a multimedia data conversion module 62, configured to convert the spatial domain data of the at least one frame of target image into frequency domain data, and extract data of a digital watermark from the frequency domain data;
and a watermark data analysis module 63, configured to decode the data of the digital watermark, so as to obtain information included in the digital watermark.
Those skilled in the art should understand that the division of the modules in the embodiments of fig. 5 and 6 is only a logical division, and the actual implementation can be wholly or partially integrated into one or more physical entities. And the modules can be realized in a form that all software is called by the processing element, or in a form that all the modules are realized in a form that all the modules are called by the processing element, or in a form that part of the modules are called by the hardware.
Referring to fig. 7, the present embodiment provides an electronic device, which may be a vehicle-mounted camera or other intelligent devices. In detail, the electronic device comprises at least, connected by a bus: the system comprises a memory and a processor, wherein the memory is used for storing computer programs, and the processor is used for executing the computer programs stored by the memory so as to execute all or part of the steps in the method embodiment.
The above-mentioned system bus may be a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. The system bus may be divided into an address bus, a data bus, a control bus, and the like. For ease of illustration, only one thick line is shown, but this does not mean that there is only one bus or one type of bus. The communication interface is used for realizing communication between the database access device and other equipment (such as a client, a read-write library and a read-only library). The Memory may include a Random Access Memory (RAM), and may further include a non-volatile Memory (non-volatile Memory), such as at least one disk Memory.
The Processor may be a general-purpose Processor, and includes a Central Processing Unit (CPU), a Network Processor (NP), and the like; the Integrated Circuit may also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, a discrete Gate or transistor logic device, or a discrete hardware component.
In conclusion, the digital watermark adding method and the analysis method for the vehicle-mounted camera multimedia resource add the digital watermark to the multimedia resource generated by the vehicle-mounted camera invisibly, so that the vehicle-mounted camera outputs the multimedia resource with the watermark without influencing the visual viewing effect of the multimedia resource; moreover, by analyzing the information of the digital watermark of the multimedia resource, the source, the generation time, the generation place and the like of the vehicle-mounted camera of the multimedia resource can be traced, so that various defects in the prior art are effectively overcome, and the method has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. A digital watermark adding method for vehicle-mounted camera multimedia resources is characterized by comprising the following steps:
generating a digital watermark according to the identification information of the vehicle-mounted camera generating the multimedia resource; wherein the digital watermark comprises text content and/or image content;
and embedding the digital watermark into the multimedia resource so as to form the final multimedia resource containing the watermark.
2. The method of claim 1, further comprising: and generating the digital watermark according to the identification information of the vehicle-mounted camera generating the multimedia resource, the generation time information and the location information of the multimedia resource.
3. The method of claim 2, wherein the digital watermark includes textual content comprising: generating a plaintext or ciphertext according to the identification information of the vehicle-mounted camera, the generation time information of the multimedia resource and the location information; the image content of the digital watermark comprises: and generating a picture according to the identification information of the vehicle-mounted camera, the generation time information and the location information of the multimedia resource, or generating a specific picture corresponding to the vehicle-mounted camera.
4. The method of claim 1, wherein the identification information comprises: the vehicle-mounted camera comprises vehicle-mounted camera information, equipment model information and equipment serial number information.
5. The method of claim 1, wherein embedding the digital watermark in the multimedia asset comprises:
selecting at least one frame of target image of the multimedia resource, and converting the spatial domain data of the at least one frame of target image into frequency domain data;
and superposing the digital watermark to the frequency domain data of the at least one frame of target image, and converting the superposed frequency domain data into spatial domain data, thereby forming at least one frame of target image containing the watermark so as to form the final multimedia resource containing the watermark.
6. A digital watermark analyzing method for vehicle-mounted camera multimedia resources is characterized by comprising the following steps:
acquiring a multimedia resource containing a watermark, and identifying at least one frame of target image containing the watermark from the multimedia resource;
converting the spatial domain data of the at least one frame of target image into frequency domain data, and extracting data of a digital watermark from the frequency domain data;
and decoding the data of the digital watermark so as to obtain the information contained in the digital watermark.
7. The utility model provides a digital watermark of on-vehicle camera multimedia resource adds device which characterized in that includes:
the digital watermark generating module is used for generating a digital watermark according to the identification information of the vehicle-mounted camera generating the multimedia resource; wherein the digital watermark comprises text content and/or image content;
and the digital watermark embedding module is used for embedding the digital watermark into the multimedia resource so as to form the final multimedia resource containing the watermark.
8. A digital watermark analyzing device for vehicle-mounted camera multimedia resources is characterized by comprising:
the multimedia resource acquisition module is used for acquiring the multimedia resource containing the watermark and identifying at least one frame of target image containing the watermark from the multimedia resource;
the multimedia data conversion module is used for converting the spatial domain data of the at least one frame of target image into frequency domain data and extracting data of the digital watermark from the frequency domain data;
and the watermark data analysis module is used for decoding the data of the digital watermark so as to obtain the information contained in the digital watermark.
9. A computer-readable storage medium, in which a computer program is stored which, when loaded and executed by a processor, carries out the method according to any one of claims 1 to 6.
10. An electronic device, comprising: a processor and a memory; wherein the content of the first and second substances,
the memory is used for storing a computer program;
the processor is configured to load and execute the computer program to cause the electronic device to perform the method according to any one of claims 1 to 6.
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