水印

The research of this paper is occupying a forward position in the relevant field.

本文的研究内容属于国际相关领域的前沿课题，具有重要的理论意义和应用前景，所给出的两种实用算法和试验结果对水印的进一步研究，进而开发相关软件有重要的参考价值。

I need a filter that overlays an invisible watermark on video stream.

我需要一个过滤器，对视频流覆盖无形的水印。

in this paper ,based on permuted image and svd, we embeddedgray watermark in colour image's dwt components.

本文根据奇异值分解理论把灰度水印嵌入到彩色图像的dwt分量中。

The sequence is permuted pseudo-randomly and is modulated by m-sequence.

在离散小波变换域，给出了自适应音频数字水印算法。

The digital watermark is to prevent pirating.

数码水印图案是用来防止盗版的。

Then, a mapping from quantized histogram to stegoimage is used to finish the embedding procedure.

提出一种全新的基于图像直方图的抵抗RST攻击的不可见数字图像水印方案。

This algorithm quantizes the wavelet coefficients to different region according to the watermarking bit to be embedded, and introduce the features of human auditory system to gain the proper quantization step. In the detection, it uses threshold judgment to achieve blind detection.

该算法仍在小波域上进行，根据不同的水印信息将小波系数量化到不同的区间，并根据心理声学模型的一个结论讨论了量化步长的选择，检测时用门限判别实现了盲检测。

The algorithm splits the original image to some blockes and do DCT transform,chooses three low-frequency coefficients in every block,quantizes them and chooses the least significance bits,then does the xor operations with the corresponding bits of water mark.,the result is the key.At the same time,we choose three high-frequency,and do the same operation and generate the other key.

该方法对原始图像进行分块DCT变换，每块取三个DCT低频系数，把这三个系数量化后取最低有效位，与水印的对应位进行异或运算得到密钥；再取三个高频系数进行异或等运算得到另一密钥。

Experiments proves that this algorithm not only give attention to the intensity of embedding watermarking but also guarantee the quality of image combining with human visual system better, and it has good robust under the image processing attacks such as cutting, filter, smoothing, sharping, and JPEG compression etc.

实验结果证明，本文算法兼顾了嵌入水印强度的同时更好的保证了图像质量，不仅能很好的结合人眼视觉系统，且对一般的图像处理如剪切、滤波、平滑、锐化和JPEG压缩，都具有较好的鲁棒性。

The clarity of image embeddedwatermark is good. At the same time, it is immune to translation, rotation, scaling, cutting, JPEG loss compression, median filter, and sharping.

同时水印对平移、旋转、缩放、剪切几何变换以及JPEG有损压缩、中值滤波、锐化、等常规图像处理手段具有较好的鲁棒性。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。