An improved capacity data hiding technique based on image interpolation

Multimedia Tools and Applications - Data hiding in multimedia objects such as text, images, audio and video clips is a technique that has been widely used to achieve security for applications...     

QR code based color image cryptography for the secured transmission of ECG signal

Multimedia Tools and Applications - The paper presents a novel QR code based color image steganography to facilitate remote transmission of ECG signal along with patient diagnosis data. The...     

一种基于DWT和DCT域的音频信息隐藏算法

提出了一种基于离散小波变换(DWT)和离散余弦变换(DCT)的音频信息隐藏的新算法.首先,对载体音频信号整体进行小波分解,将其低频小波系数分段后进行离散余弦变换;其次根据人耳听觉的频率掩蔽效应,选择出对人耳听觉容差最大的直流系数组成序列并分段;最后通过修改各段统计特征来嵌入水印.实验表明,嵌入水印后的语音信号不仅具有良好的不可感知性,而且对诸如加噪、低通滤波、重采样、重量化、回声、MP3压缩、样点裁剪、时域线性延伸和缩短等的攻击具有很强的鲁棒性.     

High capacity reversible and secured data hiding in images using interpolation and difference expansion technique

Multimedia Tools and Applications - Data hiding is a noteworthy research topic in digital technology for years. Reversible data hiding (RDH) technique plays a vital role for confirming security of...     

High capacity data hiding based on interpolated image

We investigate the use of parabolic interpolation in data hiding and propose a novel data hiding algorithm with high capacity based on interpolated image. Specifically, the proposed algorithm creates an interpolated image from input image by parabolic interpolation, and embeds secret bits into interpolated pixels in terms of the relation between the interpolated value and the mean value. Ten standard benchmark images are taken as test images for validating efficiency of our algorithm. The results illustrate that our algorithm has better performances than some popular data hiding methods in embedding capacity and visual quality with respect to PSNR and SSIM.     

High-capacity image hiding scheme based on vector quantization

A novel grayscale image hiding scheme that is capable of hiding multiple secret images into a host image of the same size is proposed in this paper. The secret images to be hidden are first compressed by vector quantization with additional index compression process. Then, the compressed secret images are encrypted and embedded into the least-significant bits of the host pixels. To provide good image quality of the stego-image, the modulus function and the image property are employed to hide the secret bits into the host pixels and determine the number of hidden bits in each host pixel, respectively. According to the results, the proposed scheme provides a higher hiding capacity and a higher degree of security than that of the virtual image cryptosystem.     

基于信息隐藏的监控图像防篡改方法

针对当前监控图像可能被恶意篡改的问题,提出了一种基于信息隐藏的监控图像保存及防篡改方法。首先,通过信息隐藏的手段,将监控图像的来源传感器及摄取时间信息进行隐藏,给出了一种基于信息隐藏的监控图像及现场信息保存的大致流程。然后,采用信息隐藏中典型的最低有效比特位( LSB)替换隐藏算法,给出了现场信息的随机嵌入和提取算法。最后,实验分析结果表明,在图像质量得到较好保持的情况下,所提方法能够实现现场信息的有效嵌入和提取,验证了所提方法的可行性和有效性。     

基于PDF417条码的信息隐藏方法

信息隐藏技术是信息安全研究领域最新热点之一,PDF417条码是中应用十分广泛的二维条码之一,将信息隐藏技术与二维条码技术相结合就产生了基于二维条码的信息隐藏技术.现有技术目前存在着信息嵌入算法复杂和隐藏信息量较小等问题.根据PDF417二维条码自身结构特点,对其组成条空进行适量的微调,将信息隐藏进条码当中.理论分析和实验结果表明该方法可以有效抵御打印扫描攻击,具有嵌入算法简单、安全性好、鲁棒性高、信息隐藏量大等优点.     

基于二相编码信号的SAR成像

二相编码信号是一种具有扩谱特性的雷达信号,无论是在雷达的探测能力、低截获能力,还是在距离分辨力以及速度分辨力方面,都十分出色。首先介绍常用的二相编码信号形式,然后基于非“停走停”假设推导回波信号的准确表达式,从本质上阐述二相编码信号的脉内多普勒偏移产生的原因,基于此分析相位编码信号的多普勒敏感性,并将其应用于合成孔径雷达(SAR)成像,可以提高其抗干扰能力。通过点目标仿真,验证了本文分析的有效性。     

基于极线几何的改进多约束图像立体匹配

针对计算机视觉和模式识别领域基本而重要的问题--立体匹配,提出了一种基于极线几何、结合特征匹配与区域匹配、视差梯度约束等多约束立体匹配算法,实现图像快速准确匹配.该算法将现有的基于特征和基于窗口匹配两种方法相结合,并加入视差梯度等约束条件,有效弥补了单一匹配算法的不足,同时增强了算法适应性.实验表明,该算法具有更高的求解质量和求解效率,可以满足双目立体视觉系统的需要.     

A secured image steganography method based on ballot transform and genetic algorithm

Multimedia Tools and Applications - Rapid advances in digital technology have facilitated us to transfer a huge amount of electronic files over the internet. But in the presence of malicious...     

基于区域增长的自适应稠密匹配算法

针对目前主流方法对图像中纹理单一区域匹配效果不佳的问题,提出了一种自适应的基于区域增长的立体像对稠密匹配算法。该算法利用灰度共生矩阵,在区域增长过程中的匹配窗内计算其纹理数量,然后根据纹理数量的多少自适应调节匹配窗的大小。当匹配窗内纹理数量足够多时,该匹配窗就能够表征该匹配窗中心点的特征,因此可以减少误匹配发生的几率。实验结果证明,该算法具有良好的性能。     

基于FPGA的多通道音频信号评估系统

设计并实现了一种基于FPGA的六通道音频信号评估系统.系统由最高64 kS/s的16位模数转换器AD73360对常用音频信号进行采样.设计了一个嵌套式状态机,按照状态跳变,将输入信号暂存到FIFO中.FIFO中的数据会通过USB协议上传到电脑端的MATLAB GUI(Graphical User Interface)中...     

Low bit-rate information hiding method based on search-order-coding technique

Information hiding method with low bit rate is important in secure communications. To reduce bit rate we propose a new embedding method in this paper based on SOC (search-order coding) compression technique. Compared to Chang et al.’s scheme in 2004, our scheme completely avoids the transform from SOC coding to OIV (original index values) coding to significantly reduce bit rate. In order to further reduce bit rate, Chang et al. proposed a reversible data hiding scheme using hybrid encoding strategies by introducing the side-match vector quantization (SMVQ) in 2013. But it needed additional 1 bit indicator to distinguish the two statuses to determine OIV is belonged to G1 or G2. This overhead gave a large burden to compression rate and could not reduce the bit rate significantly. In contrast, our scheme completely avoids this indicator. The experimental results show that the proposed method can efficiently reduce the bit rate and have the same embedding capacity compared with Chang et al.’s scheme in 2004 and Chang et al.’s scheme in 2013. Moreover, our proposed scheme can also achieve a better performance in both the embedding capacity and bit rate than other related VQ-based information hiding schemes.     

基于BMP图像信息隐藏技术的研究与实现

文章首先介绍了信息隐藏技术,然后分析了BMP文件格式,最后对在24位真色彩图像中嵌入隐藏信息的加密技术进行了研究,并给出了加密／解密算法。     

基于DSP的多通道音频信号处理平台的设计

介绍了一种基于DSP的多通道音频信号处理平台的基本电路,设计了DSP与音频编解码器TLV320AIC23B的硬件接口,实现了四通道音频信号输入和输出,同时具有高性能、低功耗和便携等特点。该平台已经应用于有源抗噪声耳罩项目中。     

基于STM32F429的音频信号发生器

基于STM32F429单片机控制系统设计了一款可远距离精确控制频率和幅度值的音频信号发生器。该发生器通过PC控制面板,按照要求输入所需频率、幅度值,借助以太网把控制命令远距离地传输给该发生器,经发生器的处理,把音频模拟信号传输给被测设备。与传统音频信号发生器相比,该发生器可同时输出两路相同的音频信号,不用粗调、细调,直接在PC控制面板上输入所需幅度频率即可,而且能远距离控制。     

基于直方图对的无损数据隐藏在指纹图像中的应用

指纹识别技术是最早的通过计算机实现的身份识别手段,在今天也是应用最为广泛的生物特征识别技术,但是该识别技术仅针对指纹图像本身.研究了在确保指纹图像不变的情况下隐藏信息,从而来提高识别的正确率.主要讲述了指纹图像(JPEG)的无损数据隐藏,采用的方法是直方图对,该方法的核心是构造直方图对从而嵌入信息.实验结果表明,该方法对指纹图像的纹理特征破坏小,嵌入后的图像的视觉失真也较小,图像质量较高,几乎不影响指纹图像的识别,同时可以把嵌入的信息和指纹识别结合起来从而提高身份认证的效率.     

Energy-efficient secured data reduction technique using image difference function in wireless video sensor networks

Multimedia Tools and Applications - Wireless sensor networks (WSN) have become the rising stars of technology. Every object in this world tends to be sensorly developped, monitored and controlled....