The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Types and characteristics of information on examination certificates are analyzed in this paper and then the two-dimensional bar code encoding method based on GB18030 character set of information in text kind, and the method for image kind on the basis of compression using zerotree of wavelet transformation is put forward. A flowgraph for the whole procedure is given and an example of examination...
We propose an improved fractal image coding algorithm based on oriented wavelet sub-tree. The algorithm couples the wavelet transform with fractal coding, set the scanning manner according to the orientation of wavelet sub-tree. It could improve the matching precision better. In addition to improving compression performance, the proposed algorithm also couples the zero-tree structure, wipes off large...
Through the analysis of the vector map files, a new lossless compression algorithm for vector maps is proposed. In the algorithm, lossless transform differentiates the graphical data of vector maps into transformed coefficients, then, making use of the principle of reduction, these transformed coefficients are compressed reversibly. At the same time, BWT Block-Sorting Algorithm is adopted as a further...
Watermark is a new effective digital copyright protection method and data security technology. A new scheme of image retrieval based upon digital watermarking has been proposed. First, embeds the binary watermark information in carried image, computes the value of NC (normalized correlation coefficient) between query watermark and extracted watermark,and gains the retrieval results. The watermarking...
In this paper, we propose a wavelet lossy image coding algorithm with edge detection and tracking using wavelet difference reduction. Firstly, we obtain the edge map of an obstacle image by SUSAN edge detector. And an edge tracking filtering method is applied to the edge information image and Region of Interest (ROI) is extracted from the original image. Then the coordinates of ROI are mapped to the...
In this paper, a new method of sparse coding shrinkage based on independent component analysis is proposed to reduce speckle in polarimetric SAR Images. With soft-thresholding operator on polarimetric SAR Image, this method reduces speckle effectively and preserved polarimetric properties. The experiment shows that the image edges are retained with the proposed method and the speckle is removed effectively.
More and more enterprises, organisations and governments have used and disturbed information in word documents, pdf etc. It makes easily to unauthorized copying and dissemination. According to DRM??s requirements that are high performance and feasible, we evaluated two common text watermarking methods for instructing practical applications, and proposed a new approach in text watermarking where inter-character...
Chinese text documents can be watermarked by analyzing and patterning the characters?? structure. This paper proposes a new natural text watermarking algorithm, which makes full use of the pictographic characters of the two-dimensional and the people??s visual redundancy. In the algorithm, some Chinese characters can be split into two characters according the watermarking content, thereby increasing...
Fractal image encoding with full search typically requires a very long runtime, which is essentially spent on searching for the best-matched block to an input range block in a large domain pool. This paper thus proposed an effective method to improve the drawback, which is mainly based on gray value moment features of normalized block and related inequality is presented by the authors. During the...
Based on the statistical analysis of relation between CBP (Coded Block Pattern), MVD (Motion Vector Difference) and each coding mode, a fast mode selection algorithm based on macroblock-adaptive is proposed. In this algorithm, adaptive judgment strategies are adopted to filter partial coding mode quickly. The residual CBP, MVD information is used adequately to identify the relativity of intra and...
Embedded Image Coding Using Zerotrees of Wavelet Coefficients (EZW) is a common and efficient image encoding algorithm. Many authors have improved it, but they aren??t able to completely reduce redundant search, they have not fully improved the coding speed. So Shapiro advanced zerotree map technique to eliminate redundant search in 1996. A typical example using zerotree map is Mow-Song Ng??s EZW...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.