Steel wire rope is extensively used in engineering as a kind of flexible component, it is very important to guarantee the security and reliability of steel wire rope. In this paper, the texture characteristics of steel wire rope, such as smoothness and entropy were extracted based on digital image processing, the external defects in it were detected. This technique offers the technical support of the safety and reliability of steel wire rope. Keywords: Steel Wire Rope, Image Processing ,Texture Characteristics ,MATLAB
A blind watermarking algorithm for 2D CAD drawings based on singular value decomposition (SVD) is presented. In this paper, the handles of lines are sorted to rule out additional entities and relative vertex coordinates are divided into small matrixes for larger watermark capacity. Then, quantization modulation is used to embed watermark so it can be extracted without original drawings. The experiments show that the proposed algorithm has good invisibility, larger watermark capacity and is also robustness to various geometric and entity addition attacks.
With the development of digital design and processing and the explosive growth of the demand for two-dimensional CAD engineering graphics, more attention has been paid on the security and the copyright issues of engineering graphics. In this paper, an improved reversible watermarking algorithm in wavelet domain for two-dimensional CAD engineering graphics is proposed. Firstly, the watermark information is preprocessed by compound chaos sequence. And then, block the graphic and extract all vertexes in each blocks of the 2D CAD engineering graphics, Log-polar Mapping (LPM) and wavelet transform are done to them respectively to achieve the invariance of affine transform. Finally, the encrypted watermark is embedded into detailed coefficients by using improved quantization index modulation (IQIM) scheme. Compared with the original previous algorithm, theoretical analysis and experimental results show that the proposed algorithm has not only good visibility and good reversibility, but also stronger robust against the attacks such as transformation, rotation, equal scaling and entity deleting, tampering or adding etc.
Abstract. In the context of internet applications, traditional learning management system has been an unprecedented challenge to the current distance education of adult students to fully understand the importance of the use of new media, necessity, and through part implementation of process oriented online education information system, which is the student population is widely popular media to develop and strengthen, so as to continuously improve the effectiveness, and improve the quality of personnel training. In this paper, the characteristics of the part implementation of process oriented online education information system, and how to use distance education of students as well as to strengthen the contemporary education.
In this paper, extract the coordinates of the vertices of the 2D CAD graphics to construct the complex-valued signal. And use the signal to do the DFT. The encrypted watermark is embedded into the DFT amplitude by using the IDE algorithm. Experimental results show that the algorithm has good invisibility, with good reversibility. The algorithm has robust against the attacks such as combination of translation, rotation, translation and adding an entity.
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