3) tamper recovery
篡改恢复
1.
The recovery watermark,which implements tamper recovery is obtained by selecting the quantization DCT coefficients of wavelet approximate sub-band,and is embedded into the DWT coefficients.
同时利用图像小波变换的近似子带的DCT量化系数作为图像内容特征生成恢复水印信息,并隐藏在DWT系数之中,实现了对图像的篡改恢复。
4) tamper detect and location
篡改检测和定位
6) tamper localization
篡改定位
1.
The authentication watermark is generated by pseudo-random number generator,where it is hidden is connected with tamper localization.
该方法嵌入鉴别水印和恢复水印,鉴别水印由伪随机数产生器生成,嵌入的鉴别水印与图像篡改位置存在本质联系,实现了对图像的篡改定位。
2.
In this paper, a scheme is proposed that not only thwarts all kinds of attacks such as vector quantization(VQ) and oracle attack in order to satisfy the security but also ensures superior accuracy of tamper localization.
很多图像认证算法或者篡改定位精度较高,但容易受到攻击,或者牺牲定位精度来提高安全性。
3.
Tamper detection and tamper localization are realized effectively because of a tamper assessment function is designed and no host image is needed in watermarking extraction.
充分利用了DWT变换提取图像特征方面的优势和DCT变换与JPEG压缩过程结合紧密的特点,使用自行设计的篡改估计函数,有效地实现了篡改检测和篡改定位,而且检测时不需要原始图像。
补充资料：篡改
1.用作伪的手段对经典﹑理论﹑政策等进行改动或曲解。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条