In this paper, the problems of mariculture area segmentation and corresponding area value estimations are investigated on the basis of airborne synthetic aperture radar (SAR) images. In order to deal with a limited amount of noisy airborne SAR image data in an efficient
way, an effective coarse-to-fine approach is proposed, consisting of three major components, including (1) an adaptive segmentation method for each local patch to remove noise from the ocean background, (2) a dynamic coarse-to-fine clustering method for grouping pixels to achieve image segments,
and (3) a polygon-fitting-based algorithm to obtain regular borders for each region and corresponding area value. Some feasible experiments are operated based on the restricted airborne SAR images, and the effectiveness of the proposed algorithm is validated in terms of the provided pixel
level evaluation annotations.
Considering the low degree of abstraction of traditional shape grammar in national pattern reuse design, this paper proposes a method based on the combination of improved shape grammar and an optimization algorithm to reuse national patterns design. As an application example, we carried out research on the batik pattern elements of the Miao nationality in the "Intangible Cultural Heritage of Guizhou Province" system. Firstly, an improved shape grammar based on synthetic predicate grammar coding is developed to represent the transformation process of design pattern reuse in batik patterns. Then, the number of patterns arranged in a specific position is taken as the optimization variable; the particle swarm optimization algorithm is used to optimize the variables, so as to obtain the optimized predicate shape grammar parameters; and the pattern is reused according to the parameters. A batik design pattern reuse system is also constructed to realize rapid design. The results show that the proposed method can enrich the reuse results of batik pattern elements and realize the rapid design of complex batik patterns.
This paper presents the effects of electron irradiation on the characteristics of single mode optical fibers doped with rare earth Er3+. The parameters of optical fibers are measured, prior to irradiation and after irradiation and annealing. It has been found that absorption loss in the wave length range of 0.80-1.60 μm is greatly lager than those of unirradiationed fibers. The irradiation induced loss obeys the following exponential laws: LUV =0.342exp [E(eV)/0.166] in the range of 0.80-1.20 urn and LIR = 2.2×104exp [-6.08E(eV)] in the range of 1.20-1.60 μm range. During annealing, the induced loss at longer wave length decreases, but that near 0.80 μm increases. Finally, the paper discusses the mechanism of loss variations. The displaced probability of oxygen and silicon atoms in electron irradiation is estimated to be 7.1×10-8 and 3.9×l0-8, respectively. The loss induced by displaced atoms is 200 times langer than that induced by the same amount of OH- at 1.40 μm. The process of annealing of the loss essentially occurs in two steps, i.e., by neutralization of the free electron and reforming of the broken bonds.
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