叠掩现象是SAR图像几何失真现象的一种。
雷达的测距特性造成SAR图像出现几何失真。
Geometric distortion in SAR images is due to the measuring range characteristic of radar.
实验证明，算法性能稳定、校正精度高、可以有效地校正大强度几何失真。
The experiments have demonstrated that this schema has stable performance, sound correction$…
基于傅里叶-梅林变换特性和相位相关性，提出了一种新的抗几何失真数字水印算法。
A new watermarking detecting algorithm which resists geometric distortion is proposed, based on Fourier-Mellin transform and phase correlation features.
灰度失真、噪声、几何失真等误差因数会影响匹配性能，本文给出了相对应的处理方法。
The error factors such as intensity distortion, noise and geometry distortion will affect matching performance, so the paper gives the opposite processing methods.
实验表明，该方案不仅对一般信号处理具有稳健性，也能够很好地抵御随机几何失真攻击。
Simulation results show the proposed scheme, with robustness enough against general signal processing, can effectively resist geometric distortion attacks.
在水印算法中用奇异值分解可以提高图像的抗几何失真性，但它对椒盐、高斯、滤波等攻击的抵抗能力却很弱。
Use singular value decomposition (SVD) in the watermark algorithm may enhance the anti-geometry distortion of the image, but it is very weak to some attacks such as salt, gauss, filter and etc.
首先，本论文通过分析平行束CT系统的理想成像关系，提出了一种适用于平行束CT系统几何失真校正的方法。
The main work can be summarized as follows: Firstly, by analyzing the ideal geometric relation in parallel CT system, the thesis presents a calibration method of geometric misalignment.
实验结果表明，该算法不但使水印具有不可见性，而且所嵌入的水印对空间几何失真和信号处理等具有较强的鲁棒性。
The experimental results show that not only does this algorithm make the watermark invisible, but the imbeded watermark also has the strong robust upon the geometry distortion in the spa.
针对现有适用于图像的数字水印对信号处理和几何失真比较敏感的问题，论文首先提出一种稳健的数字图像水印算法。
Many digital watermarks now available for images are sensitive to signal processing and geometric distortions, a robust digital image watermarking algorithm is proposed.
相位相关作为一种图像匹配技术对噪声有较高的容忍程度，检测结果与照度无关，受几何失真影响小。但该方法对旋转变化非常敏感。
Phase correlation algorithm as a kind of image matching method has many advantages such as insensitive to noise, unrelated to illumination of target, immune to geometric distortion.
利用自由缩放工具可以扭转和弯曲几何体块，贴图扩展工具是一个很好的工具，当你在一些异形的几何上贴覆材质时，保证效果不会失真。
Fredo Scale allows you to twist and bend your geometry, and Fredo ThruPaint is a great tool for UV mapping your textures on challenging geometry without any distortions.
实验结果表明，该算法可以从全局和局部或非线性几何攻击中恢复失真，是实用和有效的。
Experiment results show that this algorithm can restore distortion caused by global and local or no-linear geometrical attack, and it is practical and effective.
在几何类失真中，旋转和等比缩放失真又是最为常见的。
Among the geometric distortions, rotation and scaling most commonly happen.
桶形失真直接影响了对图像的分析理解，为了得到比较完好的图像，对拍摄到的图像进行几何校正是十分必要的。
Through transforming pixels in the image, this paper adopts L multinomial address correction to realize barrel distortion correction of images.
本文利用图象的几何特征，提出了一种二值图象无失真快速编码算法。
In this paper, a fast noiseless coding technique for binary images is proposed. This technique makes use of the geometric features of images.
最后针对临近空间大倾角失真遥感图像提出了一种分段多项式几何校正方法，取得了理想的校正精度。
Finally, for geometric correction of near space oblique remote sensing images, a piecewise polynomial geometric correction method is studied, and achieved the desired accuracy of calibration.
最后针对临近空间大倾角失真遥感图像提出了一种分段多项式几何校正方法，取得了理想的校正精度。
Finally, for geometric correction of near space oblique remote sensing images, a piecewise polynomial geometric correction method is studied, and achieved the desired accuracy of calibration.
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