可见性

At an apparent magnitude of 6.8 it is just at the limit of naked-eye visibility.

在明显的巨大6.8它是正义的在赤裸眼睛可见性极限。

A great deal of experimental results are presented, proving that the digital watermark generated by the algorithm is unperceivable and shows great robustness to the common image processing like low-pass filtering, median filtering, Wiener filtering, nosing, cropping, rotation and JPEG loss compression, etc.

大量的实验结果表明，用本算法产生的数字水印能保证数字图像的不可见性，并且对常见图像处理均具有很好的鲁棒性，主要表现在低通滤波、中值滤波、维纳滤波、图像加噪，图像裁剪、图像旋转和有损JPEG压缩处理。

Experimental results show that the algorithm has good performance, the watermark is invisible, but also better robustness.

实验结果表明，这种算法具有良好的性能，实现的水印具有不可见性，而且具有较好的鲁棒性。

Plentiful emulation experiments show that the algorithm ensures the watermark's imperceptibility and robustness, and is also robust to familiar image processing such as JPEG compression , noise contamination, cropping, zoom and circumrotate etc.

通过大量的仿真实验，证明本文算法在保证水印不可见性的同时，对常见的图像处理，如JPEG压缩、噪声、剪切、缩放以及滤波等，均具有较好的鲁棒性。

The second method makesfull use of HVS, and is in favor of invisibility and fragileness of the watermark.

这就充分利用了图像中高频信息本身的特点和人的视觉特性，有利于水印的不可见性和易损性。

Considering the requirement of watermarks robustness and imperception, we present a method which can definite the intensity of the image embedded by digital watermark by the content of image.

兼顾数字水印的稳健性和不可见性要求，提出一种根据图像内容确定嵌入数字水印图像强度的方法。

Then number of the effective corner points is statistified to quantitively show the result of performance analysis.

实验表明，该方法可行，具有强的抗压缩、几何攻击性，不可见性，鲁棒性。

In present watermark system, there are two basic preconditions: one is robustness; the other is transparency.

在现代水印中，对水印有两个基本的要求：鲁棒性和不可见性。

It was not only warranting the robustness of the watermark information,but also meeting with the invisibility of the district by using the algorithm.

该算法利用了人眼视觉模型来选取水印嵌入区域，使其既能够保证水印信息的鲁棒性又能够满足其不可见性。

The extraction of.watermark used the method of cascade extraction and Variance control, improved the accuracy and rate of extraction.

试验结果表明，算法不仅具有良好的不可见性，并且对常见的图像处置操纵具有较好的鲁棒性。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。