CN111405292B - Video encryption method based on H.265 video coding standard - Google Patents

Abstract

The invention relates to a video encryption method based on H.265 video coding standard, which is characterized by comprising the following steps: step (1), inputting a video frame sequence V in an original YUV format_ori(ii) a Step (2) from V_oriStarting to record the dividing information of all CUs of each video frame by the second video frame; step (3), copy V_oriThe Y component of each video frame constitutes a new video sequence V_y(ii) a Step (4), for V_yProcessing to obtain a foreground binary image P_sn(ii) a Step (5) of selecting V_oriA CU to be subjected to encryption processing in the second video frame; step (6), encoding the current video frame according to the H.265 standard, and performing encryption operation after CU division and entropy encoding; continuing to execute the operations (5) and (6) on the next video frame, and repeating the steps; until V is completed_oriAnd finally, generating an encrypted video coding code stream. Compared with the prior art, the method has better perception encryption effect and keeps lower computation complexity.

Description

Video encryption method based on H.265 video coding standard

Technical Field

The invention relates to a video encryption method based on H.265 video coding standard.

Background

The rapid development of video applications has covered various areas of our daily lives. With the continuous high-definition of video pictures, ultra-high-definition video consumption begins to become the mainstream of online pay video applications. However, due to the anonymity and openness of the network, the video data is often maliciously attacked in the transmission process, and the copyright of the video information is threatened. As the increasing definition of video data is accompanied by the increase of data volume, new and more efficient video coding standards are continuously updated. At present, a new generation of High Efficiency Video Coding (HEVC) is gradually applied to Video Coding applications. In order to protect video resources more efficiently, a video encryption method and an encoding standard need to be combined.

At present, a full-frame encryption mode is mostly adopted in a video encryption method based on HEVC, namely, encryption of a whole video frame is carried out in three stages of conversion or entropy coding before coding, and the video encryption method has higher encryption space and security. However, if the full-frame encryption mode is used for commercial high-definition video, the computation complexity is high, the requirements on software and hardware are high, the time consumed for data processing is long, and the real-time video communication is not facilitated.

The main content and the quality in the video are paid more attention to by the user, the main information in the video is perceptually encrypted, the calculation complexity of the encryption method can be reduced, the quality of the video can be reduced to a certain degree, the user cannot acquire the high-quality video with accurate information before decryption, and a good copyright protection effect is achieved.

Disclosure of Invention

The technical problem to be solved by the present invention is to provide a video encryption method based on the h.265 video coding standard, which can reduce the computational complexity and start a better encryption effect, aiming at the above prior art.

The technical scheme adopted by the invention for solving the technical problems is as follows: a video encryption method based on H.265 video coding standard is characterized by comprising the following steps:

step (1), inputting a video frame sequence in an original YUV format, and recording the video frame sequence in the original YUV format as V_oriThe size of the video frame is marked as w x h;

step (2) of adding V_oriCoding according to H.265 standard, and in the process of coding according to H.265 standard, V is coded_oriEach video frame in the video coding unit is divided into a plurality of coding units, and the coding units of the video frames to be coded are marked as CU; from V_oriThe second video frame starts to record the partition information of all CUs of each video frame, and the partition information is stored in a first array vector1 in the form of (pt1x, pt1y, pt2x and pt2y), wherein pt1x, pt1y, pt2x and pt2y respectively represent the horizontal coordinate of the upper left point, the vertical coordinate of the upper left point, the horizontal coordinate of the lower right point and the vertical coordinate of the lower right point of the current CU;

step (3), copy V_oriThe Y component of each video frame in the video sequence constitutes a new video sequence, which is labeled V_y；

Step (4), for V_yThe treatment specifically comprises the following steps:

step (4-1) of adding V_yIs marked as P_nAnd P_n+1Obtaining a difference map P by differencing two adjacent video frames_dn，

P_dn＝|P_n-P_n+1|，n＝1,2,3,…；

Step (4-2), and comparing the difference value graph P obtained in the step (4-1)_dnBinaryzation is carried out according to a preset threshold value T, and binary images P are correspondingly obtained respectively_tn，n＝1,2,3,…；P_tnThe binarization rule of the middle pixel point is as follows: when P is present_dnWhen the image value of the middle pixel point is more than or equal to T, P_tnReplacing the image value of the corresponding position with 255; when P is present_dnWhen the image value of the middle pixel point is less than T, P_tnThe image value of the corresponding position is replaced by 0;

step (4-3) for P_tnAnd n is 1,2,3, … to obtain foreground binary image P_sn，n＝1,2,3,…；

Step (5) of selecting V_oriAnd storing the horizontal and vertical coordinates of the upper left point of the CU in a second vector2, wherein the CU to be encrypted in the second video frame comprises the following specific steps:

step (5-1) of adding V_oriThe second video frame in (2) corresponds to a binary image P_s1Extracting the corresponding binary images P one by one from the first CU of the second video frame_s1The pixel values of the pixels of the middle horizontal and vertical coordinates in the horizontal and vertical coordinate range corresponding to the first CU are counted, if the number of the pixels of the middle horizontal and vertical coordinates exceeds K%, K is a preset threshold value, the CU is determined as an encrypted CU, and the horizontal and vertical coordinates (pt1x, pt1y) of the upper left point of the CU are stored in a second vector 2;

step (5-2), each CU corresponds to one point in the first array vector1, and other CUs are executed according to the same method in the step (5-1) until the points (pt1x, pt1y, pt2x, pt2y) meet the condition that pt2x is w-1 and pt2y is h-1, which indicates that the judgment of the current video frame is finished;

step (6), continuing to encode the current video frame according to the H.265 standard, and performing encryption operation on the current video frame in two stages of CU division and entropy coding in the process of encoding according to the H.265 standard;

clearing the vector2, and continuing to execute the operations (5) and (6) on the next video frame; the third frame corresponds to the binary image P_s2The fourth frame corresponds to the binary image P_s3And so on in turn; until V is completed_oriAnd finally, generating an encrypted video coding code stream.

As an improvement, in the step 6, the specific operation steps include:

performing Arnold transformation on YUV three component data of a CU to be encrypted in a video frame, performing 2 times of Arnold transformation if the size of the CU to be encrypted is 4 × 4, performing 3 times of Arnold transformation if the size of the CU to be encrypted is 8 × 8, and performing 4 times of Arnold transformation if the size of the CU to be encrypted is 16 × 16; performing 6 Arnold transformations if the size of the CU to be encrypted is 32 x 32;

and (6-2) carrying out XOR encryption on the symbols of the binary syntax element transformation coefficients by using a Logistic chaotic sequence in the video frame entropy coding stage.

Compared with the prior art, the method has the advantages that the specific CU containing the moving object in the video frame is positioned by a frame difference method, only the encryption operation is carried out on the part of CU, the calculation amount is concentrated to the important part in the video, the better perception encryption effect is achieved, and the lower calculation complexity is kept; in the improved scheme, the scrambling of the CU stage and the syntax element encryption of the entropy coding stage are combined, so that the cracking difficulty is increased, and the higher safety is ensured.

Drawings

Fig. 1 is a flowchart of a video encryption method based on the h.265 video coding standard according to an embodiment of the present invention. .

Detailed Description

The invention is described in further detail below with reference to the accompanying examples.

The video encryption method based on the h.265 video coding standard as shown in fig. 1 is characterized by comprising the following steps:

step (1), inputting a video frame sequence in an original YUV format, and recording the video frame sequence in the original YUV format as V_oriThe size of the video frame is marked as w x h; video sequence V used_oriIs a standard test sequence basketalldrill, wherein w is 832, h is 480;

step (2) of adding V_oriCoding according to H.265 standard, and in the process of coding according to H.265 standard, V is coded_oriEach video frame in the video coding unit is divided into a plurality of coding units, and the coding units of the video frames to be coded are marked as CU; from V_oriThe second video frame starts to record the partition information of all CUs of each video frame, and the partition information is stored in a first array vector1 in the form of (pt1x, pt1y, pt2x and pt2y), wherein pt1x, pt1y, pt2x and pt2y respectively represent the horizontal coordinate of the upper left point, the vertical coordinate of the upper left point, the horizontal coordinate of the lower right point and the vertical coordinate of the lower right point of the current CU;

step (3), copy V_oriThe Y component of each video frame in the video sequence constitutes a new video sequence, which is labeled V_y；

Step (4), for V_yThe treatment specifically comprises the following steps:

step (4-1) of adding V_yAre recorded asP_nAnd P_n+1Obtaining a difference map P by differencing two adjacent video frames_dn:

P_dn＝|P_n-P_n+1|，n＝1,2,3,…；

Step (4-2), and comparing the difference value graph P obtained in the step (4-1)_dnBinaryzation is carried out according to a preset threshold value T, and binary images P are correspondingly obtained respectively_tn，n＝1,2,3,…；P_tnThe binarization rule of the middle pixel point is as follows: when P is present_dnWhen the image value of the middle pixel point is more than or equal to T, P_tnReplacing the image value of the corresponding position with 255; when P is present_dnWhen the image value of the middle pixel point is less than T, P_tnThe image value of the corresponding position is replaced by 0; in the present embodiment, T is 50;

step (4-3) for P_tnAnd n is 1,2,3, … to obtain foreground binary image P_sn，n＝1,2,3,…；

Step (5) of selecting V_oriAnd storing the horizontal and vertical coordinates of the upper left point of the CU in a second vector2, wherein the CU to be encrypted in the second video frame comprises the following specific steps:

step (5-1) of adding V_oriThe second video frame in (2) corresponds to a binary image P_s1Extracting the corresponding binary images P one by one from the first CU of the second video frame_s1The pixel values of the pixels of the middle horizontal and vertical coordinates in the horizontal and vertical coordinate range corresponding to the first CU are counted, if the number of the pixels exceeds K%, and K is a preset threshold value, in the embodiment, K is 50, the CU is determined as an encrypted CU, and the horizontal and vertical coordinates (pt1x, pt1y) of the upper left point of the CU are stored in a second vector 2;

step (5-2), each CU corresponds to one point in the first array vector1, and other CUs are executed according to the same method in the step (5-1) until the points (pt1x, pt1y, pt2x, pt2y) meet the condition that pt2x is w-1 and pt2y is h-1, which indicates that the judgment of the current video frame is finished;

step (6), continuing to encode the current video frame according to the H.265 standard, and performing encryption operation on the current video frame in two stages of CU division and entropy coding in the process of encoding according to the H.265 standard;

clearing the vector2, and continuing to execute the operations (5) and (6) on the next video frame; the third frame corresponds to the binary image P_s2The fourth frame corresponds to the binary image P_s3And so on in turn; until V is completed_oriAnd finally, generating an encrypted video coding code stream.

In the step 6, the specific operation steps include:

performing Arnold transformation on YUV three component data of a CU to be encrypted in a video frame, performing 2 times of Arnold transformation if the size of the CU to be encrypted is 4 × 4, performing 3 times of Arnold transformation if the size of the CU to be encrypted is 8 × 8, and performing 4 times of Arnold transformation if the size of the CU to be encrypted is 16 × 16; performing 6 Arnold transformations if the size of the CU to be encrypted is 32 x 32;

and (6-2) carrying out XOR encryption on the symbols of the binary syntax element transformation coefficients by using a Logistic chaotic sequence in the video frame entropy coding stage.

Claims (1)

1. A video encryption method based on H.265 video coding standard is characterized by comprising the following steps:

step (1), inputting a video frame sequence in an original YUV format, and recording the video frame sequence in the original YUV format as V_oriThe size of the video frame is marked as w x h;

step (2) of adding V_oriCoding according to H.265 standard, and in the process of coding according to H.265 standard, V is coded_oriEach video frame in the video coding unit is divided into a plurality of coding units, and the coding units of the video frames to be coded are marked as CU; from V_oriThe second video frame starts to record the partition information of all CUs of each video frame, and the partition information is stored in a first array vector1 in the form of (pt1x, pt1y, pt2x and pt2y), wherein pt1x, pt1y, pt2x and pt2y respectively represent the horizontal coordinate of the upper left point, the vertical coordinate of the upper left point, the horizontal coordinate of the lower right point and the vertical coordinate of the lower right point of the current CU;

step (3), copy V_oriY-score of each video frame in the video streamThe new video sequence is composed, marked as V_y；

Step (4), for V_yThe treatment specifically comprises the following steps:

step (4-1) of adding V_yIs marked as P_nAnd P_n+1Obtaining a difference map P by differencing two adjacent video frames_dn，

P_dn＝|P_n-P_n+1|，n＝1，2，3，…；

Step (4-2), and comparing the difference value graph P obtained in the step (4-1)_dnBinaryzation is carried out according to a preset threshold value T, and binary images P are correspondingly obtained respectively_tn，n＝1，2，3，…；P_tnThe binarization rule of the middle pixel point is as follows: when P is present_dnWhen the image value of the middle pixel point is more than or equal to T, P_tnReplacing the image value of the corresponding position with 255; when P is present_dnWhen the image value of the middle pixel point is less than T, P_tnThe image value of the corresponding position is replaced by 0;

step (4-3) for P_tnAnd n is 1,2,3, … to obtain foreground binary image P_sn，n＝1，2，3，…；

Step (5) of selecting V_oriAnd storing the horizontal and vertical coordinates of the upper left point of the CU in a second vector2, wherein the CU to be encrypted in the second video frame comprises the following specific steps:

step (5-1) of adding V_oriThe second video frame in (2) corresponds to a binary image P_s1Extracting the corresponding binary images P one by one from the first CU of the second video frame_s1The pixel values of the pixels of the middle horizontal and vertical coordinates in the horizontal and vertical coordinate range corresponding to the first CU are counted, if the number of the pixels of the middle horizontal and vertical coordinates exceeds K%, K is a preset threshold value, the CU is determined as an encrypted CU, and the horizontal and vertical coordinates (pt1x, pt1y) of the upper left point of the CU are stored in a second vector 2;

step (5-2), each CU corresponds to one point in the first array vector1, and other CUs are executed according to the same method in the step (5-1) until the points (pt1x, pt1y, pt2x, pt2y) meet the condition that pt2x is w-1 and pt2y is h-1, which indicates that the judgment of the current video frame is finished;

and (6) continuing to encode the current video frame according to the H.265 standard, and performing encryption operation in two stages of CU division and entropy coding in the process of encoding according to the H.265 standard, wherein the method specifically comprises the following steps:

performing Arnold transformation on YUV three component data of a CU to be encrypted in a video frame, performing 2 times of Arnold transformation if the size of the CU to be encrypted is 4 × 4, performing 3 times of Arnold transformation if the size of the CU to be encrypted is 8 × 8, and performing 4 times of Arnold transformation if the size of the CU to be encrypted is 16 × 16; performing 6 Arnold transformations if the size of the CU to be encrypted is 32 x 32;

step (6-2), carrying out XOR encryption on symbols of the binary syntax element transformation coefficients by using a Logistic chaotic sequence in the video frame entropy coding stage;

clearing the vector2, and continuing to execute the operations (5) and (6) on the next video frame; the third frame corresponds to the binary image P_s2The fourth frame corresponds to the binary image P_s3And so on in turn; until V is completed_oriAnd finally, generating an encrypted video coding code stream.

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