Reversible Watermarking For JPEG Images Based On Channel Selection

JPEG is one of the most common picture formats in the Internet.Reversible watermarking in JPEG images has a wide application prospect in life.In the background of reversible watermarking in JPEG images,JPEG reversible watermarking algorithm base on channel selection is designed and achieved the choice of the embedded coefficient.It improves the visual quality of the watermark image and reduces the increase in JPEG file size The paper solves the overflow problem caused by the inherent characteristics of medical images,and proposes a watermark algorithm suitable for medical images.Specific work can be summarized as:1)We propose channel selection strategy.Traditional watermarking algorithms do not select embedded channels.Most watermarking algorithms use sequence embedding channels or choose embed areas based on experience.However,the choice of embedded channels will have different effects on the embedding effect.We use the channel selection strategy to give different embedding priorities to different channels and improve the performance of the watermarking algorithm.2)The selection of embedded coefficients is proposed to achieve bett er watermark embedding effect base on channel selection.Finally,the correctness of the proposed coefficient selection strategy is verified in the experiment and the watermark image brings improvements in image quality and storage size.3)Medical images may overflow after embedding secret information.pixel overflow in the frequency domain watermark compared to the spatial watermark is more difficult to solve.In this paper,we proposed a combination of reconstruction detection scheme and bitmap method.The method solve the problem of watermark pixel overflow in the frequency domain by adjusting the pixel values that may overflow pixels.4)We proposed a reversible watermark suitable for medical images based on the treatment of pixel overflow and the characteristics of medical images.The complete anti-overflow process and the specific reversible watermark embedding and extraction methods are described in detail.Finally,the experiment was designed and implemented and compared with related experiments according to the proposed algorithm.Good experimental results were obtained.