Contraposing the need of the robust digital watermark for the copyright protection field, a new digital watermarking algorithm in the non-subsampled contourlet transform （NSCT） domain is proposed. The largest energy...Contraposing the need of the robust digital watermark for the copyright protection field, a new digital watermarking algorithm in the non-subsampled contourlet transform （NSCT） domain is proposed. The largest energy sub-band after NSCT is selected to embed watermark. The watermark is embedded into scaleinvariant feature transform （SIFT） regions. During embedding, the initial region is divided into some cirque sub-regions with the same area, and each watermark bit is embedded into one sub-region. Extensive simulation results and comparisons show that the algorithm gets a good trade-off of invisibility, robustness and capacity, thus obtaining good quality of the image while being able to effectively resist common image processing, and geometric and combo attacks, and normalized similarity is almost all reached.展开更多
Fusion methods based on multi-scale transforms have become the mainstream of the pixel-level image fusion. However,most of these methods cannot fully exploit spatial domain information of source images, which lead to ...Fusion methods based on multi-scale transforms have become the mainstream of the pixel-level image fusion. However,most of these methods cannot fully exploit spatial domain information of source images, which lead to the degradation of image.This paper presents a fusion framework based on block-matching and 3D(BM3D) multi-scale transform. The algorithm first divides the image into different blocks and groups these 2D image blocks into 3D arrays by their similarity. Then it uses a 3D transform which consists of a 2D multi-scale and a 1D transform to transfer the arrays into transform coefficients, and then the obtained low-and high-coefficients are fused by different fusion rules. The final fused image is obtained from a series of fused 3D image block groups after the inverse transform by using an aggregation process. In the experimental part, we comparatively analyze some existing algorithms and the using of different transforms, e.g. non-subsampled Contourlet transform(NSCT), non-subsampled Shearlet transform(NSST), in the 3D transform step. Experimental results show that the proposed fusion framework can not only improve subjective visual effect, but also obtain better objective evaluation criteria than state-of-the-art methods.展开更多
为了克服当前的红外与可见光图像融合算法存在着目标不够突出、纹理细节丢失等现象,本文提出了一种基于高斯模糊逻辑和自适应双通道脉冲发放皮层模型(AdaptiveDual-ChannelSpiking CorticalModel,ADCSCM)的红外与可见光图像融合算法。首...为了克服当前的红外与可见光图像融合算法存在着目标不够突出、纹理细节丢失等现象,本文提出了一种基于高斯模糊逻辑和自适应双通道脉冲发放皮层模型(AdaptiveDual-ChannelSpiking CorticalModel,ADCSCM)的红外与可见光图像融合算法。首先,使用非下采样剪切波变换(NonSubsampled Sheartlet Transform, NSST)将源图像分解为低频和高频部分。其次,结合新拉普拉斯能量和(New Sum of Laplacian, NSL)与高斯模糊逻辑,设定双阈值来指导低频部分进行融合;同时,采用基于ADCSCM的融合规则来指导高频部分进行融合。最后,使用NSST逆变换进行重构来获取融合图像。实验结果表明,本文算法主观视觉效果最佳,并在互信息、信息熵和标准差3项指标上高于其他7种融合算法,能够有效突出红外目标、保留较多纹理细节,提高融合图像的质量。展开更多
基金supported by the National Natural Science Foundation of China(61379010)the Natural Science Basic Research Plan in Shaanxi Province of China(2015JM6293)
文摘Contraposing the need of the robust digital watermark for the copyright protection field, a new digital watermarking algorithm in the non-subsampled contourlet transform （NSCT） domain is proposed. The largest energy sub-band after NSCT is selected to embed watermark. The watermark is embedded into scaleinvariant feature transform （SIFT） regions. During embedding, the initial region is divided into some cirque sub-regions with the same area, and each watermark bit is embedded into one sub-region. Extensive simulation results and comparisons show that the algorithm gets a good trade-off of invisibility, robustness and capacity, thus obtaining good quality of the image while being able to effectively resist common image processing, and geometric and combo attacks, and normalized similarity is almost all reached.
基金supported by the National Natural Science Foundation of China(6157206361401308)+6 种基金the Fundamental Research Funds for the Central Universities(2016YJS039)the Natural Science Foundation of Hebei Province(F2016201142F2016201187)the Natural Social Foundation of Hebei Province(HB15TQ015)the Science Research Project of Hebei Province(QN2016085ZC2016040)the Natural Science Foundation of Hebei University(2014-303)
文摘Fusion methods based on multi-scale transforms have become the mainstream of the pixel-level image fusion. However,most of these methods cannot fully exploit spatial domain information of source images, which lead to the degradation of image.This paper presents a fusion framework based on block-matching and 3D(BM3D) multi-scale transform. The algorithm first divides the image into different blocks and groups these 2D image blocks into 3D arrays by their similarity. Then it uses a 3D transform which consists of a 2D multi-scale and a 1D transform to transfer the arrays into transform coefficients, and then the obtained low-and high-coefficients are fused by different fusion rules. The final fused image is obtained from a series of fused 3D image block groups after the inverse transform by using an aggregation process. In the experimental part, we comparatively analyze some existing algorithms and the using of different transforms, e.g. non-subsampled Contourlet transform(NSCT), non-subsampled Shearlet transform(NSST), in the 3D transform step. Experimental results show that the proposed fusion framework can not only improve subjective visual effect, but also obtain better objective evaluation criteria than state-of-the-art methods.
文摘为了克服当前的红外与可见光图像融合算法存在着目标不够突出、纹理细节丢失等现象,本文提出了一种基于高斯模糊逻辑和自适应双通道脉冲发放皮层模型(AdaptiveDual-ChannelSpiking CorticalModel,ADCSCM)的红外与可见光图像融合算法。首先,使用非下采样剪切波变换(NonSubsampled Sheartlet Transform, NSST)将源图像分解为低频和高频部分。其次,结合新拉普拉斯能量和(New Sum of Laplacian, NSL)与高斯模糊逻辑,设定双阈值来指导低频部分进行融合;同时,采用基于ADCSCM的融合规则来指导高频部分进行融合。最后,使用NSST逆变换进行重构来获取融合图像。实验结果表明,本文算法主观视觉效果最佳,并在互信息、信息熵和标准差3项指标上高于其他7种融合算法,能够有效突出红外目标、保留较多纹理细节,提高融合图像的质量。
