基于壓縮感知的魯棒可分離的密文域水印算法
doi: 10.11999/JEIT141017 cstr: 32379.14.JEIT141017
基金項目:
國家自然科學(xué)基金(61173178, 61272043, 61472464)，應(yīng)急通信重慶市重點實驗室(重慶通信學(xué)院)開放課題(CQKLEC, 20140504)和中央高校基本科研業(yè)務(wù)費(106112013CDJZR180005, 106112014 CDJZR185501)資助課題
Robust and Separable Watermarking Algorithm in Encrypted Image Based on Compressive Sensing
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摘要: 為了滿足密文域水印嵌入的需要，該文基于壓縮感知技術(shù)，提出一種魯棒可分離的密文域水印算法。首先，內(nèi)容擁有者將圖像進行不重疊分塊，利用邊緣檢測手段劃分重要塊和非重要塊。重要塊用傳統(tǒng)加密方式進行加密，非重要塊用壓縮感知技術(shù)進行加密，同時為水印嵌入留出一定空間，然后根據(jù)嵌入密鑰，實現(xiàn)二值水印的密文嵌入。在接收端獲取圖像內(nèi)容和水印的方式是可分離的，同時根據(jù)含水印的密文圖像塊的像素分布特性可重新判斷塊的屬性，避免了傳輸塊屬性信息。此外，水印信息重復(fù)4次嵌入在密文圖像的不同區(qū)域，保證了水印的魯棒性。實驗結(jié)果顯示所提方案在抵抗適度攻擊時具有魯棒性和安全性。Abstract: To meet the watermarking requirement in encrypted domain, a novel scheme for robust and separable watermarking in encrypted image is proposed based on Compressive Sensing (CS). Firstly, the content owner divides the original image into non-overlapping blocks, and then the edge-detection method is utilized to classify all blocks into significant or insignificant blocks. For the former, traditional method is used for encryption; and for the latter, CS is used for encryption, which leaves some space for embedding data. Then, the binary watermark is permutated with the data hiding key, and embedded into the encrypted image. The way to obtain the image content and watermark is separable, and the attributes of the block can be regained according to pixel distribution of the watermarked image, which avoids transmitting the attribute information. Furthermore, the watermark is embedded four times in the encrypted image, which guarantees its robustness. The experimental results show that the proposed scheme is robust and secure against moderate attacks.
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Key words:
- Image encryption /
- Digital watermark /
- Compressive Sensing (CS) /
- Robustness /
- Separable
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