Abstract
In this work, a reversible watermarking technique is proposed for DICOM (Digital Imaging and Communications in Medicine) image that offers high embedding capacity (payload), security and fidelity of the watermarked image. The goal is achieved by embedding watermark based on companding in lifting based discrete wavelet transform (DWT) domain. In the embedding process, the companding technique is used to increase the data hiding capacity. On the other hand, a simple linear function is used in companding to make the scheme easy to implement, and content dependant watermark is used to make the scheme robust to collusion operation. Moreover, unlike previously proposed reversible watermarking techniques, this novel approach does not embed the location map in the host image that ultimately helps to achieve high fidelity of the watermarked image. The advantage of the proposed scheme is demonstrated by simulation results and also compared with selected other related schemes.
Highlights
Rapid advancement in digital techniques had transformed the style of storage and transmission of multimedia data
The watermark can be embedded in the spatial domain or frequency domain depending on the desired application
Li et al [18] proposed a prediction error expansion (PEE) based reversible watermarking technique where multiple histogram modification mechanism is used for better embedding performance
Summary
Rapid advancement in digital techniques had transformed the style of storage and transmission of multimedia data. Reversible data hiding is used to extract the embedded information as well as to restore the original host signal. Li et al [18] proposed a prediction error expansion (PEE) based reversible watermarking technique where multiple histogram modification mechanism is used for better embedding performance. The method has better embedding performance than other IPVO based reversible watermarking technique but the time and space complexity of the system are high. Another improved pixel value ordering (IPVO) technique is proposed by Weng et al [20]. The scheme does not require transmitting location map with the host data This proposed location map free technique gives better payload capacity with good visual quality.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
