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Rapid Differentiation of Closely Related Citrus Genotypes by Fluorescence Spectroscopy

Advances in Bioscience and Biotechnology 2014年第11期5卷 903-914页

作者： Dayse Drielly Souza Santana-Vieira Debora Marcondes Bastos Pereira Milori Paulino Ribeiro Villas Boas Marina Franca e Silva Magno Guimaraes Santos Fernanda Amato Gaiotto Walter dos Santos Soares Filho Abelmon da Silva Gesteira Embrapa Cassava and Fruits Cruz das AlmasBrazil Department of Biological Sciences State University of Santa CruzIlheusBrazil Embrapa Instrumentation Sao CarlosBrazil

The differentiation of closely related Citrus genotypes is a meticulous, laborious, and time-consuming task that involves the assessment of complex traits such as growth, tolerance to stress, photosynthetic efficiency, yield, and many others. Such a task is generally accomplished either by analyzing specific features of adult plants or by applying molecular markers to young trees. On one hand, only after plants start yielding can distinct genotypes be differentiated by comparing their fruit sizes, shapes, taste, and the number of seeds. On the other hand, molecular markers are expensive, and demand expertise and time for the analysis of a larger number of plants. For these reasons, the development of techniques that could assist in an early, quick and accurate differen-tiation of closely related Citrus varieties is of utmost importance. In this context, laser-induced fluorescence spectroscopy (lifs) is a promising technique, since it is rapid, highly sensitive, and inexpensive. Previous studies showed that lifs can differentiate a variety of sweet orange. However, this new study aimed to determine lifs accuracy in the differentiation and grouping of very closely varieties of four Sunki mandarin selections: Comum, Florida, Tropical, and Maravilha. Furthermore we compared the results with ISSR and SSR molecular markers for the same varieties. lifs technique distinguished the four selections with accuracy greater than 70%. Only with molecular markers was possible distinguishing clearly Tropical from Maravilha, but not Comum from Florida selections. In this way the results suggest that lifs may be a sound tool for helping the identification of closely Citrus varieties.

关键词： Differentiation of Citrus Genotypes Sunki lifs Molecular Markers PLSR

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Using the fractal code to watermark images

Using the fractal code to watermark images

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2002年第6届信号处理国际会议

作者： Li Guanhua Zhao Yao Yuan Baozong Institute of Information Science Northern Jiaotong University Beijing 100044 China

＜正＞ We present a novel technique for the digital watermarking of still images based on fractal encoding and decoding. In general, a fractal coder exploits the spatial redundancy within the image by establishing a relationship between its different parts. We use this relationship to embed a watermark and use the invariability of the fractal parameters to retrieve the signature. The original unsigned image is not required for watermark extraction. Simulation results show the superior performance of our methods and demonstrate the robustness to such signal distortions as JPEG compression, low pass filtering, additive noise and scaling.

关键词： digital watermarking fractal compression lifs invariability PSNR robustness

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基于分形编码的数字水印新算法

基于分形编码的数字水印新算法

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中国仪器仪表学会第九届青年学术会议

作者：孙天凯邵晓根赵海峰王立文徐州工程学院信电工程学院徐州工程学院信电工程学院徐州工程学院信电工程学院徐州工程学院信电工程学院

本文在传统的基于分形图像编码的基础上,提出了一种新的数字水印算法。在对图像进行分形压缩编码的同时,记录下各值域块与最佳匹配块之间的距离d。通过比较参数d和给定阀值dh的大小,实现了水印的嵌入和提取操作。水印提取时应用了概率... 详细信息

本文在传统的基于分形图像编码的基础上,提出了一种新的数字水印算法。在对图像进行分形压缩编码的同时,记录下各值域块与最佳匹配块之间的距离d。通过比较参数d和给定阀值dh的大小,实现了水印的嵌入和提取操作。水印提取时应用了概率统计的知识,提高了水印检测的准确度,增强了水印抵抗攻击的鲁棒性。实验结果表明,本算法可以获得较好的图像质量和较高的鲁棒性。

关键词：数字水印 lifs 鲁棒性分形图像编码

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