CN115955570A - Video remote system - Google Patents
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- CN115955570A CN115955570A CN202310226069.5A CN202310226069A CN115955570A CN 115955570 A CN115955570 A CN 115955570A CN 202310226069 A CN202310226069 A CN 202310226069A CN 115955570 A CN115955570 A CN 115955570A
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Abstract
The invention relates to the technical field of image communication, in particular to a video remote system, which carries out bit layering on an original image through a bit layering module to obtain eight binary images; assigning values to pixel points in a binary image by using a preset threshold through a primary encryption module, converting the binary image into a gray image, taking the preset threshold as a layer key of the gray image of a corresponding layer, and forming a gray image key by using all layer keys; taking any one layer of gray level image as a reference image through a secondary encryption module, taking a pixel value at each position in the reference image as a reference value of the position, and assigning a value to each position based on the reference value and a corresponding layer key for each other gray level image to generate a size identification image; and the transmission module takes the reference image and the seven size identification images as the ciphertext data of the original image, and remotely transmits the ciphertext data. The invention can improve the concealment of the encryption relationship and improve the safety of video remote transmission.
Description
Technical Field
The invention relates to the technical field of image communication, in particular to a video remote system.
Background
With the wide application of automation technology in various production and manufacturing industries, remote monitoring of the production process becomes a guarantee for ensuring the stable operation of automated production, so that more and more remote monitoring systems are applied in various fields of automated production to obtain complete production monitoring data. The monitoring video produced by the enterprise automation may relate to an enterprise automation technology, that is, to a core competition technology of the enterprise, so that in order to protect the core technology of the enterprise, encryption processing needs to be performed in the process of video remote transmission when data is remotely monitored and transmitted.
The encryption of video is often the encryption of each frame of video image. The main method is to encrypt pixel values of pixels reflecting image information, the most common encryption is scrambling and replacing of the pixel values, but the conventional image encryption is only scrambling of the pixel values, namely, the conversion mode of the pixel values is too superficial, the hiding degree of the image information is not enough, the encryption effect is general, and the encryption method existing for a long time can be researched by more people, and the security is low.
Disclosure of Invention
In order to solve the problem of lower security of the existing encryption method for video remote transmission, the invention provides a video remote system, and the adopted technical scheme is as follows:
one embodiment of the invention provides a video remote system, which comprises the following modules:
the bit layering module is used for taking each frame of monitoring image in the received remote transmission video as an original image to be encrypted, and carrying out bit layering on the original image to obtain eight binary images; the binary image is the same size as the original image;
the primary encryption module is used for assigning values to pixel points in the binary image by using a preset threshold value, converting the binary image into a gray image, taking the preset threshold value as a layer key of the gray image of a corresponding layer, and forming a gray image key by using all layer keys;
the secondary encryption module is used for taking any layer of gray level image as a reference image, taking a pixel value at each position in the reference image as a reference value of the position, assigning a value to each position based on the reference value and a corresponding layer key for each other gray level image, and generating a size identification image;
and the transmission module is used for taking the reference image and the seven size identification images as the ciphertext data of the original image and remotely transmitting the ciphertext data.
In some embodiments, the primary encryption module comprises:
and the primary assignment unit is used for assigning a random gray value which is greater than or equal to the preset threshold value to the pixel point which takes the value of 1 in the binary image, and assigning a random gray value which is less than the preset threshold value to the pixel point which takes the value of 0 in the binary image.
In some embodiments, the secondary encryption module comprises:
the secondary assignment unit is used for taking the value of the pixel point at the position as a first numerical value when the gray value is larger than the reference value at the position and the preset threshold corresponding to the gray image of the layer for the pixel point at each position in other gray images of each layer; when the gray value is smaller than the reference value at the position and the preset threshold corresponding to the layer of gray image, the pixel point at the position takes a second numerical value; when the gray value is between the reference value of the position and the preset threshold corresponding to the layer of gray image, the pixel point of the position takes a value as a third numerical value; the first, second, and third values are different.
In some embodiments, the bit layering module comprises:
and the bit layering unit is used for converting the pixel value of each position in the original image into an eight-bit binary value, separating the binary value into eight numerical values, forming a binary image of a corresponding layer by the numerical values of all the positions of the same layer, and obtaining eight binary images in total.
In some embodiments, the system further comprises the following modules:
and the decryption module is used for reconstructing to obtain each layer of gray level image by utilizing the gray level image pixel values corresponding to different bit layers and the size relation between the layer keys, converting the gray level image obtained by reconstruction into a binary image according to the image key, and reconstructing all the obtained binary images to obtain a decrypted image.
The invention has at least the following beneficial effects:
firstly, carrying out bit layering on received original monitoring images to enable each frame of original monitoring image to obtain corresponding eight binary images, and firstly carrying out primary encryption by using a bit layering method. Then, assigning values to each pixel point in the binary image by using a preset threshold value of each layer of the binary image to obtain a corresponding gray image, and encrypting each bit layered plane according to the representation of each bit layered plane on original image information to realize the conversion encryption of the image information, hide the encryption relationship and improve the encryption effect; because the preset threshold value can be set to any value of the gray value, the confusion of the encrypted ciphertext data is large, eight binary images can be simultaneously and randomly valued, the corresponding encryption space is huge, and the encryption process is efficient. Then, selecting any layer of gray level image as a reference image, converting eight binary images generated by bit hierarchical encryption into a combination of one reference image and seven size identification images as ciphertext data through the relationship of pixel values of other gray level images and the reference image at the same position; the safety and the integrity of the data in the production process of the enterprise can be ensured. The reference image is any layer of gray level image, namely, different layers of gray level images are used as the reference image to correspondingly obtain different size identification images, namely, the reference image is selected to be also used as a part of encryption, so that the corresponding relation between the bit layered gray level image of the original image and the size identification image is hidden, and the encryption effect of video remote transmission is further improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions and advantages of the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a system block diagram of a video remote system according to an embodiment of the present invention.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, a video remote system according to the present invention, the detailed description, structure, features and effects thereof are provided below with reference to the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "another embodiment" refers to not necessarily the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
The following describes a specific scheme of a video remote system provided by the present invention in detail with reference to the accompanying drawings.
Referring to fig. 1, a system block diagram of a video remote system according to an embodiment of the present invention is shown, where the system includes the following modules:
a bit layering module 100, a primary encryption module 200, a secondary encryption module 300, and a transmission module 400.
The bit layering module 100 is configured to perform bit layering on each frame of monitoring image in the received remote transmission video as an original image to be encrypted to obtain eight binary images; the binary image is the same size as the original image.
In order to monitor the enterprise processing process, a camera is required to be installed in a processing workshop at first, the production process is monitored, a monitoring video is obtained and is remotely transmitted, and the monitoring video is recorded as the remote transmission video to carry out encryption transmission on the remote transmission video.
The video is encrypted mainly according to the encryption of each frame of each video image, so each frame of image is firstly separated according to the video and is used as the subsequent encrypted original image data.
The encryption of the original image is mainly based on the conversion of pixel values in the original image to realize the hiding of the information of the original image, and the more hidden the conversion mode of the pixel values is, the better the encryption effect is. The invention encrypts the bit layer plane through the representation of the original image in the bit layer and the relation between different bit layers, thereby realizing the encryption of the original image information.
The bit layering unit is used for converting the pixel value of each position in the original image into eight-bit binary values, separating the binary values into eight numerical values, forming a binary image of a corresponding layer by the numerical values of all the positions of the same layer, and obtaining eight binary images in total.
The method comprises the steps of utilizing bit layers to represent information of an original image, and then encrypting the original image based on the bit layers.
Firstly, bit layering is carried out on an original image, namely pixel value and pixel digit of the original image are respectively read, and then the original image is divided into 8 bit layering planes. At the moment, the relationship between the bit hierarchical planes jointly forms original image information, and then the original image is encrypted based on the image bit hierarchical planes.
For example, there is an image of four pixels (2 x 2) with pixel values of 1,2,3,4, respectively. The representation of the image is:
converting the pixel value to an 8-bit binary number as: 1 (00000001), 2 (00000010), 3 (00000011), 4 (00000100), the 8 bit layer image of this image is:
that is, each bit in the pixel values of the 8-bit binary number of all the pixel points forms a layer of binary image with the same size as the original image, and the values in the binary image are only 1 and 0.
In the image bit layering, each layering plane has the size of an original image, and each position is a binary bit value, so that each bit layering plane is a binary image which is as large as the original image.
The primary encryption module 200 is configured to assign values to pixel points in a binary image by using a preset threshold, convert the binary image into a grayscale image, and use the preset threshold as a layer key of the grayscale image of a corresponding layer, where all the layer keys form a grayscale image key.
The primary encryption module 200 includes a primary assignment unit and a grayscale image key acquisition unit.
The binary image has less image information amount and single relationship between pixel points, which is not beneficial to the conversion of the image information and the hiding of the conversion relationship. At this time, the binary image of the bit-layered plane is converted into a grayscale image by using the conversion relationship between the binary image and the grayscale image.
And the primary assignment unit is used for assigning a random gray value which is greater than or equal to a preset threshold value to the pixel point which takes the value of 1 in the binary image, and assigning a random gray value which is less than the preset threshold value to the pixel point which takes the value of 0 in the binary image.
Converting the binary image into a gray image by using a primary assignment unit, and specifically comprising the following steps:
taking any binary image as an example, firstly, setting a threshold M in a range [0,255] of a pixel value of a gray image, giving a pixel point with a value of 1 in the binary image to a random value in the range [ M,255] as a gray value of a corresponding pixel point; and meanwhile, giving a random numerical value in a [0, M) interval as the gray value of the corresponding pixel point to the pixel point with the pixel value of 0 in the binary image, so far, converting the original binary image into a gray image, namely hiding the original binary image in the gray image, and realizing the encryption of corresponding bit layering.
For example, if the preset threshold of the first-layer binary image is 150, for the pixel points whose pixel values are 1 in the binary image, random values in the [150,255] interval are used as the gray values of the corresponding pixel points, for example, one of the pixel points whose pixel value is 1 is assigned as 169; for the pixel points with the pixel value of 0 in the binary image, the random values in the interval of [0, 150) are all used as the gray values of the corresponding pixel points, for example, one of the pixel points with the pixel value of 0 is assigned as 72.
The original binary image is converted into a grayscale image by a preset threshold value M, and the conversion relationship is related only to the set preset threshold value M. At this time, the original binary image information is completely hidden in the converted gray-scale image, that is, the binary image is encrypted, and the encryption key of the layer is the preset threshold value M, that is, the gray-scale image can be directly converted into the original binary image by the preset threshold value M.
And the gray image key acquisition unit is used for forming a gray image key by taking a preset threshold corresponding to each layer of binary image as a layer key.
Setting a preset threshold value for each layer of binary image, converting the bit-layered binary image corresponding to the original image into a gray image by using a primary assignment unit, and completing encryption of all bit planes, namely realizing encryption of the original image. Wherein 8 bit planes respectively correspond to 8 preset thresholds M, and the numerical values of the 8 preset thresholds are arbitrarily selected in the gray value range and respectively expressed as
Namely, the encryption key of the grayscale image is recorded as the grayscale image key.
The pixel values of the gray level image converted by the binary image are randomly distributed in a chaotic way to reflect the confusion of ciphertext data, and each bit plane can correspond to 256 preset thresholds, so that the preset thresholds corresponding to 8 bit planes can be the same
One, i.e. the current encryption key space is
，
The size of the key space represents the efficiency of the encryption of the present invention.
The secondary encryption module 300 is configured to use any one layer of grayscale image as a reference image, use a pixel value at each position in the reference image as a reference value of the position, assign a value to each position based on the reference value and a corresponding layer key for each other grayscale image, and generate a size identification image.
The bit layered plane of the original image is converted into a gray level image through the modules, bit layered encryption is carried out, and encryption of the original image is achieved. However, the amount of ciphertext data generated in the current encryption process is large, which is not beneficial to remote transmission of the ciphertext data, so that the generated ciphertext data needs to be continuously processed to reduce the data amount.
Given that the above encryption process enables a plaintext image to generate 8 ciphertext grayscale images, only the size relationship between the pixel value and the threshold value in the generated ciphertext image reflects the plaintext information of the original image, so that on the premise of retaining the size relationship of the grayscale value, the 8 ciphertext grayscale images are fused to complete new assignment.
The secondary assignment unit is used for taking the value of the pixel point at the position as a first numerical value when the gray value is larger than the reference value at the position and the preset threshold corresponding to the gray image of the layer for the pixel point at each position in other gray images of each layer; when the gray value is smaller than the reference value at the position and the preset threshold corresponding to the layer of gray image, taking the value of the pixel point at the position as a second numerical value; when the gray value is between the reference value of the position and the preset threshold corresponding to the layer of gray image, the pixel point of the position takes a third numerical value; the first value, the second value, and the third value are different.
Taking any one layer of gray level image as a reference image, taking a pixel value at each position in the reference image as a reference value of the position, wherein each gray level image corresponds to a preset threshold value M, and at the moment, judging the size relationship between the pixel value in each gray level image and the corresponding position reference value as well as the preset threshold value corresponding to the gray level image, wherein the size relationship between the pixel value in each gray level image and the corresponding position reference value as well as the size relationship between the pixel value in each gray level image and the preset threshold value corresponding to the gray level image have the following possibilities: all the values of the values are larger than the reference value and the preset threshold value, all the gray values are smaller than the reference value and the preset threshold value, and the gray values are between the reference value and the preset threshold value, and the three size relationships are respectively expressed as a first numerical value "0", a second numerical value "10", and a third numerical value "11", and are used as the size identifier of each pixel point in each gray image. In other embodiments, the values of the first value, the second value, and the third value may also be adjusted according to actual encryption habits, but the values of the three values are different.
Taking the first gray scale image as an example of the reference image, for a certain position, there are eight pixel values corresponding to eight gray scale images: 121 185, 201, 84, 144, 42, 208, and 106, according to the sequence of the eight pixel points, the corresponding preset thresholds are: 180 190, 200, 100, 140, 113, 145, 98, the pixel value of the first reference image at the position is unchanged and still is 121, the pixel values of the other seven grayscale images at the position are represented by corresponding size identifiers according to the size relationship, for example, the second grayscale value 185 is greater than the reference value 121 and is less than the corresponding preset threshold value 190, i.e. is between the reference value and the preset threshold value, the position is assigned with the third numeric value 11, and so on, the eight grayscale images at the position obtain the results: 121, 11,0, 10,0, 10,0, 11. All the pixel points are assigned according to the process, the gray value in the first gray image serving as the reference image is unchanged, the gray values in the rest seven gray images are converted into size identifiers, and each layer forms a size identification image taking the reference image as a comparison reference.
It should be noted that the selection range of the preset threshold is within the range of [0,255], that is, any gray value may be used, and in other embodiments, the value of the preset threshold may be adjusted according to the actual situation.
Through the process, 8 ciphertext gray images generated by encryption are converted into a reference ciphertext gray image and 7 size identification images representing the gray value, each pixel point in the size identification images is at most two-bit binary codes, and compared with the original 8-bit gray value, ciphertext data are greatly reduced; meanwhile, the selection of the reference image can also be used as a part of encryption, the reference images at different positions correspondingly obtain different size identification images, namely, the corresponding relation between the bit layered gray level image of the original plaintext image and the size identification images is hidden, and the encryption effect of the invention is further improved.
The transmission module 400 is configured to remotely transmit the ciphertext data by using the reference image and the seven size identification images as the ciphertext data of the original image.
The encryption of original images is completed through the modules, namely the encryption of remote transmission video data is completed, then in order to facilitate the transmission of ciphertext data, the existing compression technology is firstly utilized to compress the ciphertext data, and then the compressed data is transmitted, so that the safety and the integrity of data in the production process of enterprises are ensured.
Further, the system of the present invention further includes a decryption module, configured to reconstruct and obtain each layer of gray scale image by using the gray scale image pixel values corresponding to different bit hierarchies and the size relationship between the layer keys, convert the reconstructed gray scale image into a binary image according to the image key, and reconstruct all the obtained binary images to obtain a decrypted image.
When decrypting ciphertext data, firstly 8 ciphertext gray level images need to be obtained, namely the ciphertext gray level images need to be reconstructed according to a reference image and 7 size identification images. The specific process is as follows: firstly, according to the size identifier of each pixel point in the size identification image, determining the size relation between the pixel value of the gray level image at the corresponding position and a reference value and a corresponding preset threshold value, then obtaining the value range of the final gray level value of the pixel point on the basis of the range of [0-255], and then determining the gray level value randomly generated in the final range. And by analogy, 7 ciphertext gray images are obtained through reconstruction.
Taking any pixel point as an example, the ciphertext after gray value fusion is represented as: 121 11,0, 10,0, 11, the corresponding gray level thresholds of the bit hierarchies are: 180 190, 200, 100, 140, 113, 145, 98, the pixel values obtained after reconstruction are: 121, 133, 234, 67, 211, 109, 198, 118.
Wherein "11" indicates that the gray value is between the reference pixel value and the corresponding gray threshold, in the above example, the pixel value intervals corresponding to "11" are (121, 190) and (98, 121), respectively, the gray value obtained by reconstruction is 133 and 118, respectively, the reconstruction of the pixel value has randomness in the interval, and the reconstruction interval reflects the size relationship of the gray value, thereby embodying the relationship between the reconstructed gray value and the binary image of the plain text image bit layering plane, and the reconstruction of the gray value of the cipher text gray image makes the current encryption reversible, so that the encryption process is complete. The extraction and the calling of the image are ensured, the decryption verification is required to be carried out according to the current encryption process, and the practicability of the encryption process is ensured.
And judging the size relation between the gray value of each pixel point in the reconstructed gray image and the corresponding preset threshold value, further converting the gray value into a binary image to obtain an original bit hierarchy, and then reconstructing the bit hierarchy to obtain a plaintext image obtained by decryption.
In summary, the embodiment of the present invention includes the following modules:
the device comprises a bit layering module, a primary encryption module, a secondary encryption module and a transmission module.
Specifically, each frame of monitoring image in the received remote transmission video is used as an original image to be encrypted through a bit layering module, and bit layering is carried out on the original image to obtain eight binary images; the size of the binary image is the same as that of the original image; assigning values to pixel points in a binary image by using a preset threshold through a primary encryption module, converting the binary image into a gray image, taking the preset threshold as a layer key of the gray image of a corresponding layer, and forming a gray image key by using all layer keys; taking any one layer of gray level image as a reference image through a secondary encryption module, taking a pixel value at each position in the reference image as a reference value of the position, and assigning a value to each position based on the reference value and a corresponding layer key for each other gray level image to generate a size identification image; and the transmission module takes the reference image and the seven size identification images as the ciphertext data of the original image, and remotely transmits the ciphertext data. The invention realizes the conversion encryption of the image information, improves the concealment of the encryption relationship and improves the encryption effect.
It should be noted that: the precedence order of the above embodiments of the present invention is only for description, and does not represent the merits of the embodiments. And that specific embodiments have been described above. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing may also be possible or may be advantageous.
The embodiments in the present specification are described in a progressive manner, and the same or similar parts in the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; modifications of the technical solutions described in the foregoing embodiments, or equivalents of some technical features thereof, are not essential to the spirit of the technical solutions of the embodiments of the present application, and are all included in the scope of the present application.
Claims (5)
1. A video remote system, comprising the following modules:
the bit layering module is used for taking each frame of monitoring image in the received remote transmission video as an original image to be encrypted, and carrying out bit layering on the original image to obtain eight binary images;
the primary encryption module is used for assigning values to pixel points in the binary image by using a preset threshold value, converting the binary image into a gray image, taking the preset threshold value as a layer key of the gray image of a corresponding layer, and forming a gray image key by all the layer keys;
the secondary encryption module is used for taking any one layer of gray level image as a reference image, taking a pixel value at each position in the reference image as a reference value of the position, assigning a value to each position based on the reference value and a corresponding layer key for each other gray level image, and generating a size identification image;
and the transmission module is used for taking the reference image and the seven size identification images as the ciphertext data of the original image and remotely transmitting the ciphertext data.
2. The video remote system according to claim 1, wherein said primary encryption module comprises:
and the primary assignment unit is used for assigning a random gray value which is greater than or equal to the preset threshold value to the pixel point with the value of 1 in the binary image, and assigning a random gray value which is less than the preset threshold value to the pixel point with the value of 0 in the binary image.
3. The video remote system according to claim 1, wherein said secondary encryption module comprises:
the secondary assignment unit is used for taking the value of the pixel point at the position as a first numerical value when the gray value is larger than the reference value at the position and the preset threshold corresponding to the gray image of the layer for the pixel point at each position in other gray images of each layer; when the gray value is smaller than the reference value at the position and the preset threshold corresponding to the layer of gray image, taking the value of the pixel point at the position as a second numerical value; when the gray value is between the reference value of the position and the preset threshold corresponding to the layer of gray image, the pixel point of the position takes a value as a third numerical value; the first, second and third values are different.
4. The video remote system according to claim 1, wherein said bit layering module comprises:
and the bit layering unit is used for converting the pixel value of each position in the original image into an eight-bit binary value, separating the binary value into eight numerical values, forming a binary image of a corresponding layer by the numerical values of all the positions of the same layer, and obtaining eight binary images in total.
5. A video remote system according to claim 1, further comprising the following modules:
and the decryption module is used for reconstructing to obtain each layer of gray level image by utilizing the gray level image pixel values corresponding to different bit layers and the size relation between the layer keys, converting the gray level image obtained by reconstruction into a binary image according to the image key, and reconstructing all the obtained binary images to obtain a decrypted image.
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