一种基于二值图像的信息隐藏技术

在信息技术飞速发展的今天,人们对信息安全给予了更多关注。信息隐藏技术已经成为信息安全的焦点问题。因为每个Web站点以及网络通信都依赖于多媒体,如音频、视频和图像等。而信息隐藏这项技术将秘密信息嵌入到多媒体中,并且不损坏原有的载体。在没有专门检测工具的情况下,第三方既觉察不到秘密信息的存在,也不知道存在秘密信息。因此密钥、数字签名和私密信息都可以在Internet上安全的传送。本文讨论了一种如何通过二值图像完成对信息的隐藏传输的方法。     

Distance measurement based on pixel variation of CCD images

This paper presents a distance measurement method based on pixel number variation of CCD images by referencing to two arbitrarily designated points in the image frames. By establishing a relationship between the displacement of the camera movement along the photographing direction and the difference in pixel count between reference points in the images, the distance from an object can be calculated via the proposed method. To integrate the measuring functions into digital cameras, a circuit design implementing the proposed measuring system in selecting reference points, measuring distance, and displaying measurement results on CCD panel of the digital camera is proposed in this paper. In comparison to pattern recognition or image analysis methods, the proposed measuring approach is simple and straightforward for practical implementation into digital cameras. To validate the performance of the proposed method, measurement results using the proposed method and ultrasonic rangefinders are also presented in this paper.     

MERC: a fortran iv program for the production of topographic data for the planet mercury

MERC provides the capability to construct cross sections or topographic maps for parts of the surface of the planet Mercury. The photometric theory that permits digital image brightness measurements from the Mariner 10 spacecraft to be converted into changes in surface topography elevations is described. Techniques for leveling or readjusting the slope of specific portions of a cross profile by multiple surface albedo estimates are discussed. We present several examples of crater cross sections and a topographic map.     

在单片机系统中利用图素数值特征的二值图象处理算法研究

根据二值图素8-邻接点结构变化规律及MCS-51系列单片机存储系统工作特点提出利用二值图素数值特征进行图像处理的算法,并将算法软件利用局部图域递归处理方法成功移植到MCS-51系列单片机二值图像处理系统,形成适用MCS-51系列单片机存储系统的二值图像处理算法。该算法也适用于其他系列单片机实现二值图像处理。     

基于.NET的鼠标光标的研究及应用

Windows正常情况下,鼠标光标形状为向左上角的单箭头符号。在开发应用软件的过程中,常常需要建立不同鼠标光标位置及状态,以提醒用户正在或即将进行的某种类型行为。本文应用.NET软件中的VC 、VC#等语言分别实现了对特定活动范围或特定边界的鼠标光标位置进行精确设定。     

Surface roughness evaluation of marble by 3D laser profilometry and pulsed thermography

Three dimensional (3D) laser profilometry (LP) and pulsed thermography (PT) were used in the inspection of Pentelic marble. Quarry Pentelic marble samples, after processed with different roughness treatments (i.e. 60, 80, 100, 220, 400 and 600 mesh), were evaluated in the laboratory. Furthermore, different surface cleaning treatments were applied to a Pentelic marble surface in situ and then representative samples were collected and evaluated in the laboratory by the means of these two non-destructive techniques. Quantitative analysis of all samples was performed. The surface roughness parameter Rq at a specific length scale was estimated by the use of the LP scanning approach. Furthermore, 3D micro-topography plots from the laser scans were attained. PT, through the formation of temperature—time plots that display the intensity of pixels as a function of time on the obtained thermal images, was able to distinguish the influence of the applied roughness treatments. Results indicate that these two non-contact and non-destructive techniques can be used for the assessment of surface roughness.     

偏置型像素预测的航拍图像可逆信息隐藏

航拍绝缘子图像在电力线路设备巡检中具有重要意义,无人机一般使用电荷藕合器件图像传感器,拍出的绝缘子图像通常分辨率低、噪点多、背景复杂度差别大,因此对信息嵌入容量和图像保真度要求高.针对上述特点,提出了一种基于偏置型像素预测的可逆信息隐藏方法.新方法标识了动态窗口像素块内的像素,设计了偏置型预测像素选择策略,结合均衡型方案对SIPI标准图像库的Lena和Airplane以及3幅航拍工况绝缘子图像进行了实验分析.结果表明,偏置型方案可以在不降低嵌入质量的前提下,获得更高的嵌入容量.     

混合高斯模型和机器视频的火灾检测的实现

针对目前基于传感器技术的火灾探测器存在检测区域小、干扰大、误报率高等不足,提出了一种基于混合高斯模型与机器视觉相结合的火灾检测方法.该方法通过对摄像头获取的图像信息进行处理和分析,利用火灾早期产生的烟雾和火焰的颜色及形体变化特征来探测火灾.通过建立混合高斯模型对火灾进行识别,再对识别结果进行进一步的动态特征识别.试验证明,该方法克服了传感器检测方法的缺点,实时性好、识别率高.     

Optoelectronic Smart Pixels Comprising Flip-Chip-Bonded GaAs/AIGaAs MQW Detectors and Modulators on Silicon CMOS Circuit

Optoelectronic smart pixels with hybrid integration of GaAs/AlGaAs multiple quantum well (MQW) detectors and modulators arrays have beed made,which are flip-chip bonded directly on the top of lμm silicon CMOS circuits,as enables an achievement of Optoelectronic Integrated Circuits (OEIC) as well as does the design and optimization of CMOS circuits and GaAs/AlGaAs MQW devices to proceed independently.     

基于像素的时序数据可视化分析方法TSD-PVAP

提出了一种基于像素的时序数据可视化分析方法TSD-PVAP。该方法采用了基于像素的可视化技术,运用了HSI颜色映射模式方法和递归模式的像素排列技术,对大数据量的时序数据进行可视化分析。