Papers by Keyword: Watermark

Abstract: In this paper the digital watermarking algorithm deep into the field of integrated circuits combined with the JPEG image watermarking processes and SOPC technology, Verilog HDL language is used to design and implement of a reusable JPEG decoder IP core which can be embedded, realizing the JPEG decoding on FPGA platform and further completing the watermark embedding. The JPEG decoder is tested through the Modalism simulation software and would be revised until the simulation results become correct. Finally, the Altera development board EP2C70F896C6N of CycloneII series is used to complete the system design. The results prove that the system can run well, the program which can obtain a larger increase speed in exchange for consuming a little hardware resource does work.

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Abstract: More than one third of process operations consist in surface preparations in the integrated circuits’ manufacturing. Most of them are directly or indirectly linked with photo lithography. This paper deals with these interactions.

Abstract: The wet cleaning process plays an important role in advanced semiconductor industry. Particularly when bare silicon areas are exposed, wafer drying can result in undesired watermark (WM) residues on the surface [1-2]. In principle there are three components effecting the formation, shape and size of WM. 1) composition of the ambient like oxygen concentration, relative humidity and temperature affect WM formation [3]. 2) liquid: factors such as pH and the amount of dissolved species inside the liquid influence the WM composition. 3) substrate: for silicon for instance: surface passivation is important for WM formation [2]. WMs are composed of silica that is formed during the drying process by oxidation of the silicon surface [1]. Therefore when studying WM formation it is important to understand the mechanism (s) of silicon oxidation and the dissolution.

Abstract: In order to guarantee the programs play correctly and protect the digital video copyright, this paper gets a method on high-definition video (HD video) online recognition with strong robustness through analyzing the TV monitoring system requirements and video characters, based on the DCT algorithm. This method will embed the watermark after obtaining the embedding positions by analyzing video frames. It can improve the robustness to compression, noise and filtering by using Arnold scramble and spread spectrum technology. It is a real-time measure to extract watermark and recognize it in HD videos. This method shows of good performance to online recognition in HD video’s watermark extracting and recognizing in theoretical analysis and simulation experiment.

Abstract: This paper introduces the design and implementation of the safe transmission mechanism of wireless sensor network. This scheme is aimed at reducing node’s cost of computing and communication. Firstly, the WSN will be clustered. Then, encryption key will be generated in the clusters, which is used of data encryption and decryption based on nodes identification to ensure data security. The system uses the wireless microcontroller CC2430/CC2431 to perform the simulation testing for program modules of Chipcon, which integrates CC2420RF wireless RF transceiver. Experimental results show that the new algorithm can increase traffic, node utilization and improve the confidentiality and security of sensor information.

Abstract: This article studies image copyright protection algorithm based on watermark. Aimed at the defect that watermark loading algorithm easily leads to the loss of original image information, it proposes a kind of quantization based on wavelet tree structure so that in the watermark extraction process, it can restore the original intact image without original image or watermark information. First, it makes use of level-four wavelet transform to construct tree wavelet coefficient waveband diagram. Then it discretizes and insets watermark information into different waveband nodes of tree structure according to coefficient variation maximum principle. By designing self-adaption threshold value during extracting process, it can restrict some common watermarking loss better, such as smoothing, mean value filtering and gaussian noise. The experiment result proves that this method can make watermark image the visually same as the original image and watermark can still be extracted effectively after preprocessing.

Abstract: In this paper, an image transmission system utilizing chaos-based watermarking technique for copyright protection of the image transmission system is demonstrated experimentally. This system assures when pirated image is found, the illegal user can be traced. The users message after chaotic encryption as watermark can be embedded into image. Experimental results show our system which is used for a web-based image transmission is effective and robust. Especially, users message can also be extracted from the watermark image under diverse attacks such as some image-processing operations and Joint Photographic Experts Group (JPEG) compression.

Abstract: Vehicular environment with the fast varying and fast moving character calls for the support of security communication technologies. The solutions based on watermark and VPN (Virtual Private Network) are discussed to realize security communication of DSRC (Dedicated Short Range Communication), which is earmarked for motor vehicles to exchange information with each other in the area of ITS (Intelligent Transport System).Finally this paper analyses the characteristics of the solutions.

Abstract: A watermarking technique for true-color image based on double random phase encryption method and digital holography is proposed. Three different watermark images are encrypted into three holograms, respectively. Then, three holograms are hiding into a true-color image. Watermark extract method has also been described detailedly. Simulation Results indicate that our proposed watermarking technique can resist physical attack well and has a high security degree of hidden information.