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1.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 03 | Mar 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 1076 Reversible Data Hiding in Video Frames based on Matched Neighbour Predictors Jerisha Liby J1, Jaya T2 1Research Scholar, C.S.I.I.T, Thovalai 2Research Supervisor & Head, C.S.I.I.T, Thovalai -------------------------------------------------------------------------***------------------------------------------------------------------------ Abstract - This paper proposes a Reversible Data Hiding (RDH) on video frames that uses a new predictor named as Matched Neighbour Predictor (MNP). Inspired by the Prediction Error Expansion technique (PEE), the Matched Neighbour Predictor is proposed. In prediction error expansion technique, a predicted image is estimated from the host image and the predictionerror is estimated by obtaining the difference between the host image and the predicted image. In the proposed MNP technique the predicted image is estimated by choosing three consecutive frames of the video. The distortion between first/third frame and second frame is used to check whether the data can be embedded or not. The proposed method produces a low prediction error compared to traditional predictor and the data is embedded by expanding the prediction error. The performance of the proposed algorithm was measured using the metrics such as embedding rate (bpp) and PSNR (Peak signal to noise ratio). Index Terms— Embedding rate, Prediction Error Expansion, Reversible Data Hiding, Video frames 1. Introduction Data hiding [1]-[5] is a technique that conceals the data into the cover media such as image, video etc. In order to recoverthe cover media and hidden information reversible data hiding are commonly used. This data hiding technique is used in many applications such as copyright protection, medical imaging and military applications. Several researches are done on RDH which includes the popular state-of-art such as difference expansion, prediction error and histogram shifting. The histogram shifting [6] method estimates the histogram and it estimates the intensity to hide the data. The histograms totheleftofbinare shifted to the left to embed the data. In difference expansion a pair of pixel is chosen and the difference between the pixels of the pair is used to embed the data. The quality of image highly reduces if the difference is large for more number of pairs. The prediction error expansion technique initially estimates a predicted image from the host image, and the difference between the predicted image and host image gives the prediction error. The data is embedded by the expansion of prediction error. Several RDH algorithm [7]-[10] have been proposed using the prediction errors, to achieve better performance. Since color is a powerful visual descriptors, there are several data embedding algorithms in color space that includes three-color- channel based algorithms [11]-[12],chrominancebased algorithm[13]-[14]andluminancebasedalgorithms[15]-[16].Itisnot possible to recover the host color image from the marked color image in these algorithms. In order to achieve the property of reversibility, researches started to work on prediction error that has sharper histograms and thereby reducing the total distortion. After embedding the data, the color marked image appears to be a noisy image when comparing the host image. In [17] Zhang et al proposed a Reversible data hiding with Gray scale invariance. This method satisfies the property of gray scale invariance. i.e. the gray scale version of RGB image beforeandafter embeddingremainsthesame. Thismethod usesRand B channel to embed the data while green channel is used for adjustment to satisfy the property of gray scale invariance. This method predicts the predicted image using a new predictor from which the prediction error is estimated by obtaining the difference between the host image and predicted image. The data is embedded on the prediction error by expanding it. After embedding the data the green channel is adjusted to maintain the original gray version. Similar to data embedding, the data extraction algorithm initially extracts the data from the R and B channel. The original R and B channels are thenreconstructed form the marked R and B channels. Finally the G channel is readjusted to obtain the original host image. The rest of the paper is constructed as follows section II shows the proposed RDH algorithm on video. Section III shows the experimental results and analysis of the proposed RDH algorithm and finally section IV depicts the conclusionofthe proposed work. I. Proposed RDH Algorithm The proposed reversible data hiding on video was derived from the prediction error expansion technique.Let represents the binary message to embed on the video. Let represent the prediction errors. Let represent the pixels of predicted
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 03 | Mar 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 1077 image, represents the pixels of host image. The prediction error can be estimated from the host image and predicted image as, (1) where represents the position of pixel. The proposed Reversible data hiding algorithm has two major modules such as (a) Data Embedding and (b) Data Extraction A. Data Embedding Fig 1 shows the block diagram of the proposed data embedding algorithm, where it uses frame 2 as reference frame for estimating the prediction error and frame 1 and 3 is used for embedding the data. Fig. 1. Block diagram of Proposed Data embedding Let represents any three consecutive frames of a video, where each frame has components represented by, , and The predicted image is estimated for frame 1 and frame 3 by using frame 2 as reference frame. Fig 2 shows the estimationof predicted image during data embedding by keeping frame 2 as reference frame. The predicted image of red component of frame 1 is calculated using matched neighbour predictor (MNP) as follows, Fig. 2. Estimation of predicted image during data embedding Let represents a distortion threshold. The prediction image is chosen if the distortion is less than the distortion threshold ie. . (2) If the distortion is less than the distortionthreshold ie thenthepredictedimageof is .Ifthe distortion is greater than or equal to the distortion threshold ie then the pixel should not be used for embedding. Let represents the predicted image of . Similarly the predicted images of green and blue channels are estimated. Let represents the predicted image of green and blue channels and respectively. Video frames Predicte d Image Prediction error Data Embedding Frame 1 Frame 2 Frame 3 Predicte d Image Prediction error Data Embedding Data 2 Data 1 Marked frame 1 Marked frame 2 Marked frame 3 Marked Video frames Frame 1 or 3 Frame 2 or Reference frame
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 03 | Mar 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 1078 (3) Similarly the predicted image of third frame is estimated by keeping frame 2 as reference frame. Let the predicted image of third frame is represented as, (4) The prediction error of frame 1 is calculated as, (5) The prediction error of frame 3 is calculated as, (6) The data 1 is embedded on the prediction error and the data 2 is embedded on the prediction error . Let represents the set of data to be embedded on (i.e. data 1) and be the set of data to be embedded on (i.e. data 2). The modified prediction error after embedding the data on two frames will be, (7) (8) The first frame after embedding (marked video frame 1) will be, (9) Similarly the third frame after embedding will be, (10) The second marked video frame is same as that of second host video frame. (11) B. Data Extraction Fig . 3. Estimation of predicted image during data extraction Fig 4 shows the block diagram of the proposed data extraction algorithm. The data extraction process is similar to data embedding. Fig 3 shows the estimation of predicted image during data extraction. Marked Frame 1 or 3 Marked Frame 2 or Reference frame
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 01 | Jan 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 1079 Fig. 4. Block diagram of Proposed Data extraction Let represents the three consecutive marked video frames represented as, , and . Similar to data embedding, the predicted image for frame 1 and frame 3 can be estimated by keeping frame 2 as reference frame. The distortion can be calculated using (2). If is less than the distortion then data is available in the location . If is greater than the distortion threshold then the data is not available in the location . Let and represents the predicted image frames of marked frame and respectively. The modified prediction errors of marked frame1 and frame3 can be estimated as, (12) (13) From the modified prediction errors data 1 can be recovered using, (14) Similarly, the data 2 can be recovered using. (15) From the modified prediction errors and the prediction errors and can be calculated as, (16) (17) where represent the floor operation. From the prediction errors, the host video frame 1 and frame 3 can be recoveredas, (18) (19) The second frame will be same as that of marked video frame (i.e. ) III. Experimental Results The simulation of the proposed work was done using MATLAB and the performance of the proposed work was tested using two ‘video 1’ and ‘video 2’ each having frames. The frame size of each videos are . Fig 5 shows the frame of Video frames Predicte d Image Modified Prediction error Data Extraction & Reconstruction Predicte d Image Data 2 Data 1 Marked Video frames Frame 1 Marked frame 1 Marked frame 2 Marked frame 3 Modified Prediction error Frame 2 Frame 3Data Extraction & Reconstruction
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 01 | Jan 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 1080 video 1 and video 2. A bit gray scale image Lena, Barbara and Baboon are used as data which is shown in fig (6). The performance of the proposed method was analysed using the metrics such as embedding rate and PSNR. (a) (b) (c) (d) (e) (e) Fig. 5. Three consecutive frames of video 1 and video 2 (a)-(c) frame 1, frame 2 and frame 3 of video 1 (d)-(e) frame 1, frame 2 and frame 3 of video 2 (a) (b) (c) Fig 6: Secret images (a) Lena (b) Barbara (c) Baboon The embedding rate can be calculated using, (20) where is the embedding capacity i.e. number of bits to be hidden, is the frame size and is the total number of frames required to hide bits. The PSNR between host frame and markedframefortheproposedmethod wascalculatedusing the relation, (21) where, where represents the host video frame and represents the marked video frame of .
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 01 | Jan 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 1081 (a) (b) (c) (d) Fig 7: Marked video frames for the secret image Lena (a)-(b) frames 1 and 3 for video 1 (c)-(d) frames 1 and 3 for video 2 (a) (b) (c) (d) Fig 8: Marked video frames for the secret image Barbara (a)-(b) frames 1 and 3 for video 1 (c)-(d) frames 1 and 3 for video 2 (a) (b) (c) (d) Fig 9: Marked video frames for the secret image Baboon (a)-(b) frames 1 and 3 for video 1 (c)-(d) frames 1 and 3 for video 2
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 01 | Jan 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 1082 Fig 7, fig 8 fig 9 shows the marked video frames 1 and 3 for two videos, video 1 and video 2 with different secret images like Lena, Barbara and Baboon. The performance of the proposed method was compared with the traditional Zhang et. al method [17]. Table 1 shows the Capacity, embedding rate (bpp) and PSNR of one frame for the proposed RDH algorithm. TABLE 1: Capacity, Embedding Rate And PSNR Measurement Secret images Metrics Proposed RDH Zhang et al [17] Video 1 Video 2 Video 1 Video 2 Lena Capacity 127548 129924 126810 129150 bpp 0.1621 0.1652 0.1612 0.1642 PSNR(dB) 35.52 35.57 33.06 33.21 Barbara Capacity 127548 129924 126810 129150 bpp 0.1621 0.1652 0.1612 0.1642 PSNR(dB) 35.63 35.44 33.34 33.18 Baboon Capacity 127548 129924 126810 129150 bpp 0.1621 0.1652 0.1612 0.1642 PSNR(dB) 35.72 35.52 33.47 33.09 (a) (b)
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 01 | Jan 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 1083 (c) Fig 10: PSNR comparison of Proposed and Zhang et.al method (a) Secret image ‘Lena’ (b) Secret image ‘Barbara’ (c) Secret image ‘Baboon’ The capacity and embedding rate of the proposed method was slightlygreaterthanthe traditional Zhanget.al method [17]. But the PSNR of the proposed method was around 2dB greater than the Zhang et. al method. Fig 10 shows the graphical comparison of proposed method and Zhang et.al method on twotestvideos‘Video1’and‘Video2’.Fora particular videoframe, the PSNR slightly changes for change in secret image. The next section shows the Conclusion of the proposed work. IV. Conclusion This paper proposed a Reversibledata hidingonvideoframesusingMatchedNeighbourPredictor(MNP).TheMNPpredictor chooses three consecutive frames and select second frame as reference frame. The distortion is measured betweenfirst/third frame and second frame. The distortion level will decide whether the data can be embedded in the centre pixel or not. If the distortion is greater than the threshold, then data cannot be embedded in the centre of the neighbourhood. The proposed algorithm was implemented using MATLAB and the performance was verified using the metrics such as embedding rate and PSNR. The proposed method provides a high quality marked video frames when compared to the traditional Zhang et. al method. i.e. the proposed method provides a PSNR 2dB greater than the conventional Zhang et. al method. REFERENCES [1] X. Zhu, J. Ding, H. Dong, K. Hu and X. Zhang, “Normalized Correlation-Based Quantization Modulation for Robust Watermarking,” IEEE Trans. Multimedia, vol. 16, no. 7, pp. 1888-1904, Nov. 2014. [2] A. Ahmad, M. Pant, and C. Ahn, “SVD based fragile watermarking scheme for tamper localization and self-recovery,” International Journal of Machine Learning and Cybernetics, vol. 7, no. 6, pp. 1225-1239, 2016. [3] A. Khan, A. Siddiqa, S. Munib, and S. A. Malik, “Arecentsurveyofreversiblewatermarkingtechniques,” Informationsciences, vol. 279, pp. 251–272, 2014. [4] B. Li, M. Wang, J. Huang, and X. Li, “A new cost function for spatial image steganography,” IEEE International Conferenceon Image Processing (ICIP), pp. 4206-4210, 2014. [5] M. Asikuzzaman and M. R. Pickering, “An Overview of Digital Video Watermarking,” IEEE Trans. Circuits System and Video Technology, vol., no. 99, pp. 1-1. doi: 10.1109/TCSVT.2017.2712162. [6] Z. Ni, Y. Shi, N. Ansari, and S. Wei, “Reversible Data Hiding,” IEEE Trans. Circuits SystemandVideoTechnology,vol.16,no.3, pp. 354 - 362, 2006. [7] P. Tsai, Y.C. Hu, and H.L. Yeh, “Reversible Image Hiding Scheme Using Predictive Coding and Histogram Shifting,” Signal Processing, vol. 89, pp. 1129-1143, 2009. [8] V. Sachnev, H. J. Kim, J. Nam, S. Suresh, and Y. Shi, “Reversible Watermarking Algorithm Using Sorting andPrediction,”IEEE Trans. Circuits and Systems for Video Technology, vol. 19, no. 7, pp. 989-999, July 2009.
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 01 | Jan 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 1084 [9] X. Li, B. Yang, and T. Zeng, “Efficient Reversible Watermarking Based on Adaptive Prediction-Error Expansion and Pixel Selection,” IEEE Trans. Image Processing, vol. 20, no. 12, pp. 3524-3533, Dec. 2011. [10] B. Ou, X. Li, Y. Zhao, R. Ni and Y. Q. Shi, ”Pairwise Prediction-Error Expansion for Efficient Reversible Data Hiding,” IEEE Trans. Image Processing, vol. 22, no. 12, pp. 5010-5021, Dec. 2013. [11] C. H. Chou and K. C. Liu, “A perceptually tuned watermarking scheme for color images,” IEEE Trans.ImageProcessing,vol. 19, no. 11, pp. 2966-2982, Nov. 2010. [12] Y. He, W. Liang, J. Liang, and M. Pei, “Tensor decomposition based color image watermarking,” Procedings of SPIE, vol. 9069, pp. 90690U- 90690U-6, Jan. 2014. [13] M. Asikuzzaman, M. J. Alam, A. J. Lambert, and M. R. Pickering, “Imperceptible and robust blind video watermarkingusing chrominance embedding: A set of approaches in the DT CWT domain,” IEEE Trans. Information Forensics and Security, vol. 9, no. 9, pp. 1502-1517, Sep. 2014. [14] M. Asikuzzaman, M. J. Alam, A. J. Lambert, and M. R. Pickering, “A blind and robust video watermarking scheme using chrominance embedding,” International Conference on Digital lmage Computing: Techniques and Applications, pp. 1-6, Nov. 2014. [15] M. Kutter and S. Winkler, “A vision-based masking model for spread spectrum image watermarking,” IEEE Trans. Image Processing, vol. 11, no. 1, pp. 16-25, Jan. 2002. [16] P. Bao and X. Ma, “Image adaptive watermarkingusingwaveletdomainsingularvaluedecomposition,”IEEETrans.Circuits and Systems for Video Technology, vol. 15, no. 1, pp. 96-102, Jan. 2005. [17] Dongdong Hou, Weiming Zhang, Kejiang Chen, Sian-JhengLinandNenghaiYu,“ReversibleData HidinginColor Imagewith Grayscale Invariance” , IEEE Transactions on Circuits and Systems for Video Technology, Vol. 29 , Issue: 2 ,PP. 363-374, Feb. 2019.
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