Infrared Image Watermarking Protection Technology Research

At present, the development and application of infrared thermal imaging technology has been widely used. It makes a propellant role in the development of the national economy. With the rapid development of multimedia technology and network technology, it is convenient to transmit and apply the infrared image, but it also reduces the value of infrared images by piratical phenomena. The infrared image copyright protection has become really important.First, analyze the basic digital watermarking algorithms and the application in images, and compare the advantages and disadvantages of these algorithms, and summarize the basic demand in infrared images watermarking algorithm. And then propose two improved watermarking algorithms.A watermarking algorithm for the copyright protection of infrared image is proposed. The perceptually significant wavelet coefficients are selected by using human visual system and the strength of embedded watermark is determined by the just noticeable distortion. The watermark is detected hierarchically to save detection time. Experimental results show that the algorithm is invisible and robust enough.The basic principle of error correction code is researched. An adaptive watermarking algorithm in improved zerotree wavelet is proposed and the hamming code is used to correct the wrong code. The factors which influence the digital watermark's robustness are discussed. The watermark is embedded into the high-frequency band which greater than the threshold of the wavelet image representation by changing the median value. The algorithm is safe and robust against common attacks. The quantization step is determined adaptively in accord with different images.Compare the two algorithms proposed in this paper, and then analyze the performance of these two algorithms. Finally, open out a software system which adapts to infrared image.Compared with the traditional algorithms, the two algorithms proposed in this paper can be ensuring the range of temperature in 1%, which did not affect the application of the infrared image copyright protection.