2004年,坦桑尼亚发行了一套题为《坦桑尼亚矿业》的邮票,由4枚邮票、1枚小全张和1个小型张组成,其中小型张邮票的图案展示了六种未经加工的宝石,即宝石矿物原石,分别是变石(也叫金绿宝石)、金刚石、红宝石、绿宝石、坦桑黝帘石和蓝宝石...2004年,坦桑尼亚发行了一套题为《坦桑尼亚矿业》的邮票,由4枚邮票、1枚小全张和1个小型张组成,其中小型张邮票的图案展示了六种未经加工的宝石,即宝石矿物原石,分别是变石(也叫金绿宝石)、金刚石、红宝石、绿宝石、坦桑黝帘石和蓝宝石。在这枚小型张邮票上标注的文字出现两处错误,一处是右上角的“Unprossed gemstones of Tanzania” (未经加工的坦桑尼亚宝石)。展开更多
Similar to having done for the mid-point and trapezoid quadrature rules,we obtain alternative estimations of error bounds for the Simpson＇s quadrature rule involving n-time（1 ≤ n ≤ 4） differentiable mappings and ...Similar to having done for the mid-point and trapezoid quadrature rules,we obtain alternative estimations of error bounds for the Simpson＇s quadrature rule involving n-time（1 ≤ n ≤ 4） differentiable mappings and then to the estimations of error bounds for the adaptive Simpson＇s quadrature rule.展开更多
A blind and readable image watermarking scheme using wavelet tree quantization is proposed. In order to increase the algorithm robustness and ensure the watermark integrity,error correction coding techniques are used ...A blind and readable image watermarking scheme using wavelet tree quantization is proposed. In order to increase the algorithm robustness and ensure the watermark integrity,error correction coding techniques are used to encode the embedded watermark. In the watermark embedding process, the wavelet coefficients of the host image are grouped into wavelet trees and each watermark bit is embedded by using two trees. The trees are so quantized that they exhibit a large enough statistical difference, which will later be used for watermark extraction. The experimental results show that the proposed algorithm is effective and robust to common image processing operations and some geometric operations such as JPEG compression, JPEG2000 compression, filtering, Gaussian noise attack, and row-column removal. It is demonstrated that the proposed technique is practical.展开更多
文摘2004年,坦桑尼亚发行了一套题为《坦桑尼亚矿业》的邮票,由4枚邮票、1枚小全张和1个小型张组成,其中小型张邮票的图案展示了六种未经加工的宝石,即宝石矿物原石,分别是变石(也叫金绿宝石)、金刚石、红宝石、绿宝石、坦桑黝帘石和蓝宝石。在这枚小型张邮票上标注的文字出现两处错误,一处是右上角的“Unprossed gemstones of Tanzania” (未经加工的坦桑尼亚宝石)。
基金Supported by the Natural Science Foundation of Zhejiang Province（Y6090361）
文摘Similar to having done for the mid-point and trapezoid quadrature rules,we obtain alternative estimations of error bounds for the Simpson＇s quadrature rule involving n-time（1 ≤ n ≤ 4） differentiable mappings and then to the estimations of error bounds for the adaptive Simpson＇s quadrature rule.
文摘A blind and readable image watermarking scheme using wavelet tree quantization is proposed. In order to increase the algorithm robustness and ensure the watermark integrity,error correction coding techniques are used to encode the embedded watermark. In the watermark embedding process, the wavelet coefficients of the host image are grouped into wavelet trees and each watermark bit is embedded by using two trees. The trees are so quantized that they exhibit a large enough statistical difference, which will later be used for watermark extraction. The experimental results show that the proposed algorithm is effective and robust to common image processing operations and some geometric operations such as JPEG compression, JPEG2000 compression, filtering, Gaussian noise attack, and row-column removal. It is demonstrated that the proposed technique is practical.
