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海面影像的纹理信息少、匹配精度低致使现有的相对定向方法误差大,稳定性差;通过对其进行改进,有效地提高了相对定向参数标定的精度和稳定性。文中建议了几何模型,并以共面方程为控制方程,采用附有参数的条件平差法计算相对定向参数,同时发展了初始值计算方法,保证了迭代的收敛性。从两个方面入手提高相对定向参数标定的精度和稳定性,并给出了详细的计算流程:1)在摄影区域内近似均匀的选取特征点,并采用高精度的匹配方法进行影像匹配;2)在大量的共轭点对(不低于1 000个)中选取最优匹配点(不低于300个)进行相对定向参数计算。海面实测数据分析时通过迭代的方式在1 200个共轭点中逐渐剔除了粗差点和误差较大点,最终得到了由321个最优匹配共轭点计算出的精确相对定向参数,检验了所述方法的可行性。该研究解决了相对定向标定精度低、稳定性差的问题,提高了立体摄影海浪测量技术的可靠性,有利于其推广和应用。 相似文献
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红壳色文蛤选育子代各壳色的形态分化及养殖效果的比较 总被引:2,自引:0,他引:2
以红壳色为目标性状,于2009年进行了文蛤(Meretrix meretrix)的群体选育研究,建立了红壳色选系子一代(Fl),对子一代壳色种类、分布频率及其数量性状进行了统计、测量和分析,并对各壳色的形态、生长速度做了研究.结果表明,文蛤壳色具有多态性,红色、黄色、白双、黄双、波纹的分布频率分别为75.58%、8.55%、0.53%、14.83%、0.50%.红壳色亲本的子代中出现红色∶花色=3∶1,符合孟德尔遗传模式.聚类分析与欧氏距离矩阵结果表明,文蛤波纹与黄色遗传距离最近,白双与黄双遗传距离相近,与红壳色的遗传距离最远.主成分分析显示白双文蛤与黄双文蛤在空间分布上相对重叠,波纹文蛤与黄色文蛤具有较高的重叠率,而红壳色文蛤相对分散,从而进一步说明5种壳色文蛤的遗传距离关系.经过1a同池养殖,子代壳长多数已达到10~30 mm,红壳色文蛤的日生长率为0.20%,花壳色文蛤的日生长率为0.18%,且红壳色文蛤的相对比较生长速度比花壳色文蛤快10.41%.红壳色文蛤选育子代的壳长与壳宽、壳高、粒重存在一定的回归关系.红壳色文蛤壳长对壳宽、壳高、粒重的回归方程分别为:y1=0.502 4x1-0.556 0(R2=0.992 0)、y3=0.8103x3+0.620 0(R2=0.995 6)、y5=0.000 3x25.9029(R2=0.991 9),花壳色文蛤壳长对壳宽、壳高、粒重的回归方程分别为:y2=0.495 3x2-0.419 2(R2=0.990 9)、y4=0.798 5x4+0.793 5(R2=0.995 6)、y6=0.000 4x26.845 8(R2=0.993 4).研究结果为文蛤的红壳色定向选育奠定了理论基础. 相似文献
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以江苏文蛤(Meretrix meretrix)为研究对象,采集红壳色文蛤原种、黄壳色文蛤原种、红壳色文蛤选育F1、红壳色文蛤选育F2 4个群体,检测其主要非挥发性鲜味物质成分单磷酸腺苷(AMP)、单磷酸鸟苷(GMP)、次黄嘌呤核苷酸(IMP)、琥珀酸、游离氨基酸、无机离子(Na~+、K~+、Cl~–、PO_4~(3–))的含量,并通过味道强度值(TAV)评价其呈味作用。鉴于核苷酸与氨基酸在呈味方面的协同效应,采用味精当量(EUC)评价不同文蛤群体的鲜味品质。结果表明,文蛤软体组织中AMP、琥珀酸、谷氨酸、精氨酸、丙氨酸、Na+、K~+、Cl~–的TAV值大于1,是文蛤鲜味的主要贡献者;红壳色文蛤原种的鲜味强度最大(4.92 g/100g),其子代红壳色文蛤F1(4.08 g/100g)、红壳色文蛤F2(4.09 g/100g)稍有降低,但仍显著高于黄壳色文蛤原种(3.34 g/100g)(P0.05),表明江苏红壳色文蛤在鲜味品质方面具有相对稳定的较高品质。 相似文献
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基于图像特征的航空高光谱数据油污染光谱曲线提取分析 总被引:1,自引:0,他引:1
运用基于图像特征的相对发射率数据处理模型,对获得航空高光谱油污染水体数据和正常水体数据进行了反射率提取,得到了相对定标后的油污染水体和正常海水的光谱反射率数据。进一步对正常海水和油污染水体的光谱特性进行分析,通过反射率曲线比较,得出运用基于图像特征的反射率处理模型提取光谱信息和运用航空高光谱数据进行海上油污染检测的可行性。 相似文献
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为寻求评价日光模拟器的新方法 ,作者基于异谱同色指数和显色指数分析了 D65光谱的敏感性质 ,并讨论了其间的差异。基于异谱同色指数分析了 D65光谱上特殊波长间敏感性质的关联性 ,以期更全面、准确地了解光谱的敏感性质 相似文献
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Gi Hoon Hong Dong Beom Yang Hyun-Mi Lee Sung Ryull Yang Hee Woon Chung Chang Joon Kim Young-Il Kim Chang Soo Chung Yu-Hwan Ahn Young-Je Park Jeong-Eon Moon 《Ocean Science Journal》2012,47(3):387-394
Korean Geostationary Ocean Color Imager (GOCI) and Moderate Resolution Imaging Spectroradiometer (MODIS) Aqua observations of the variation in ocean color at the sea surface were utilized to monitor the impact of nutrient-rich sewage sludge disposal in the oligotrophic area of the Yellow Sea. MODIS revealed that algal blooms persisted in the spring annually at the dump site in the Yellow Sea since year 2000 to the present. A number of implications of using products of the satellite ocean color imagers were exploited here based on the measurements in the Yellow Sea. GOCI observes almost every hour during the daylight period, every day since June 2011. Therefore, GOCI provides a powerful tool to monitor waste disposal at sea in real time. Tracking of disposal activity from a large tanker was possible hour by hour from the GOCI timeseries images compared to MODIS. Smaller changes in the color of the ocean surface can be easily observed, as GOCI resolves images at smaller scales in space and time in comparison to polar orbiting satellites, e.g., MODIS. GOCI may be widely used to monitor various marine activities in the sea, including waste disposal activity from ships. 相似文献
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This paper attempts to more thoroughly understand the factor effects on the performance of an optical triangulation system used for range finding in water. In this study analytical expressions for estimating the peak of the laser spot and for image processing were presented. Both the design of experiment process and the Taguchi method have been used to evaluate factor effects and to specify design parameters. To assess the effects of monochrome and color image displays on the performance of range finding, two sets of experiments were carried out. The optimum models based on factor effects were predicted and constructed through the analysis of variance. The confirmation experiments were performed and the outcomes are in good agreement with the predicted optima. Based upon the results of experiments and analyses, it is found that brightness, contrast, and peak detection algorithms are the main factors to dominate the quality of range finding while using a monochrome camera. And further, all control factors of brightness, contrast, peak detection algorithm, sampling range, and specific primary color for intensity computation are critical to the quality of range finding while using a color camera. Notably, right selections of the image resolution and the sampling range can shorten the computing time and get high precision results. 相似文献
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污水可生化性及其影响因素研究 总被引:1,自引:0,他引:1
以自行设计的生化呼吸线测定装置研究了印染污水的可生化性,该装置通过反应体系的溶解氧浓度跟踪生物降解过程.采用本文设计的模拟污水处理装置探讨了污泥驯化时间、污水投加量等对污水可生化性的影响.测定了污水经可生化性调控后的处理效果.结果表明,生化呼吸线法判断污水处理体系的可生化性是1种可靠易行的方法,提高体系的可生化性是增加污水处理效果的关键因素. 相似文献
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E. V. Stepanova M. V. Trofimova T. O. Chaplina Yu. D. Chashechkin 《Izvestiya Atmospheric and Oceanic Physics》2012,48(5):516-527
We simulate the pattern of impurity transport in vortex flows contacting the free surface. We trace the evolution of a compact spot of a marker into spiral arms on the surface of a compound vortex created by a uniformly rotating disk in a cylindrical container. The markers are aniline ink and sunflower oil. We calculate the parameters of structural elements of flows. The geometry of the spiral flow is structurally stable in a wide range of experimental parameters. 相似文献
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An approximate model for nonlinear dispersion in monochromatic wave propagation models 总被引:4,自引:0,他引:4
A method is proposed for smoothly matching an approximate, shallow-water dispersion relation to an analytically obtained relation for intermediate and deep water. The method provides a correct limit for increasing water depth in the case of weakly non-linear waves, and provides a smooth prediction of wave parameters for the entire range of water depth. The model is applied to a parabolic equation form of the combined refraction-diffraction model, and numerical results are presented in comparison to published data. 相似文献
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Numerical Simulation of Waves Interaction with A Submerged Horizontal Twin-Plate Breakwater 总被引:3,自引:1,他引:2
The numerical investigation of regular waves interacting with a submerged horizontal twin-plate breakwater is presented in this paper. A numerical model with an absorbing wave-maker is established based on the VOF method. The validity of the model is verified by experimental results. Comparisons between the numerical and experimental results show that both the water surface profiles and the wave-induced pressures can be modeled accurately. Wave deformation over the breakwater,water particle velocities aroun... 相似文献