ID 原文 译文
20965 首先依据Hosaka原理提出层递进的分块规则，将图像分成与其内容频率分布高低相符的不同尺寸的子块并赋予相应的掩盖权值； Firstly, according to the layer-layer progressive rule based on Hosaka principle, an image is divided into sub-blocks with different sizes that match the frequency distribution of its content, and a masking weight is assigned to each sub-block correspondingly.
20966 然后通过提取像素点梯度信息，经两步检噪实现子块噪点甄别； Then the noise in the image is detected through the pixel gradient information extraction, via a two-step strategy.
20967 再使用掩盖权值对子块噪声污染指标加权得到初步质量评价结果； Following that, the preliminary evaluation value is obtained by using the masking weights to weight the noise pollution index of all the sub-blocks.
20968 最终修正和归一化后为整图质量评价结果——改进的无参考峰值信噪比(MNRPSNR)。 Finally, the correction andnormalization are carried out to generate the whole image quality evaluation parameter——i.e. Modified No-Reference Peak Signal to Noise Ratio (MNRPSNR).
20969 应用该算法在LIVE和TID2008图像质量评价数据库上对多种噪声类型图像进行实验， Such an algorithm is tested on LIVE and TID2008 image quality assessment database, covering a variety of noise types.
20970 结果显示其较目前主流评价算法保有很强竞争力，对传统算法改进效果显著，与人眼主观感受一致性高，普适于多种噪声类型。 The results indicate that compared with the current mainstream evaluation algorithms, it has strong competitiveness, and also has the significant effects in improving the traditional algorithm. Moreover, the high degree of consistency to the human subjective feelingsand the applicability to multiple noise types are well demonstrated.
20971 该文设计了两种人工磁导体(AMC)单元，在8～20  GHz的超宽频带内，两种AMC结构能够实现180°±37° 的反射相位差， In this paper, two novel Artificial Magnetic Conductor (AMC) structures, based on circular loop patch and substrate, are designed to realize 180° reflection phase difference in a wide frequency band.
20972 将这两种单元组成棋盘结构时，能够实现入射电磁波的散射场相消，从而在超宽的频带内实现棋盘表面法向雷达散射截面(RCS)的显著减缩。 These two AMCs’ reflection phase property is applied to redirecting the scattering fields of a radar target to reduce its Radar Cross Section (RCS). This method of RCS reduction can be realized by covering with a chessboard surface composed of two proposed AMC structures, so the RCS reduction in a wide frequency band can be achieved as well.
20973 同时，利用超表面天线的概念，设计馈电网络，将设计的AMC结构用做天线，仿真发现在9.08～10.30 GHz的范围内，天线的S11小于–10 dB，可以实现天线的有效辐射。 Meanwhile, this surface also can be used as antenna. By precisely designing feednetwork, the metasurface antenna can be designed. This antenna also has a low profile. The simulated impedance matching frequency band is from 9.08 to 10.30 GHz.
20974 实测结果和仿真吻合较好，因此该文的棋盘结构可以实现具有RCS减缩特性的天线设计。 Excellent agreement is obtained between simulation and measurement for metasurface antenna and chessboard surface. Such method gives a method forintegrated design of antenna and metasurface, so the RCS reduction can be achieved, at the same time theradiation properties can be maintained.