An Electronic Image Stabilization Algorithm Based on Efficient Block Matching on the Bitplane

This paper proposes an electronic image stabilization algorithm based on efficient block matching on the plane. This algorithm uses a hexagonal search algorithm, and uses the bit-planes to estimate and compensate for the translational motion between video sequences at the same time;As for the rotary motion vector generated in the video sequences, in order to highlight the intensity change of the image sequence, the algorithm firstly conducts Laplace transform for the reference frame, then select a number of characteristics at the image edge to make block matching with the current frame, calculate and compensate for the rotational movement that may exist finally. Through theoretical analysis and simula-tion, we prove that, as for a mixed translational and rotational motion video sequences, the proposed algorithm can reduce required time for block matching computation ,while improving the accuracy of the electronic image stabilization.

Electronic image stabilization system based on global feature tracking

A new robust electronic image stabilization system is presented, which involves feature-point, tracking based global motion estimation and Kalman filtering based motion compensation. First, global motion is estimated from the local motions of selected feature points. Considering the local moving objects or the inevitable mismatch, the matching validation, based on the stable relative distance between the points set is proposed, thus maintaining high accuracy and robustness. Next, the global motion parameters are accumulated for correction by Kalman filteration. The experimental result illustrates that the proposed system is effective to stabilize translational, rotational, and zooming jitter and robust to local motions.

Real-time digital image stabilization based on regional field image gray projection

Digital image stabilization technique plays important roles in video surveillance and object acquisition.Many useful electronic image stabilization algorithms have been studied.A real-time algorithm is proposed based on field image gray projection which enables the regional odd and even field image to be projected into x and y directions and thus to get the regional gray projection curves in x and y directions,respectively.For the odd field image channel,motion parameters can be estimated via iterative minimum absolute difference based on two successive field image regional gray projection curves.Then motion compensations can be obtained after using the Kalman filter method.Finally,the odd field image is adjusted according to the compensations.In the mean time,motion compensation is applied to the even field image channel with the odd field image gray projection curves of the current frame.By minimizing absolute difference between odd and even field image gray projection curves of the current frame,the inter-field motion parameters can be estimated.Therefore,the even field image can be adjusted by combining the inter-field motion parameters and the odd field compensations.Finally,the stabilized image sequence can be obtained by synthesizing the adjusted odd and even field images.Experimental results show that the proposed algorithm can run in real-time and have a good stabilization performance.In addition,image blurring can be improved.

Digital image stabilization system based on inertial measurement module

In order to stabilize the video module to build digital image stabilization image sequence, a method of using inertial measurement system is proposed. Through applying real-time attitude in- formation of the camera that obtained by high-precision attitude sensor to estimate the image motion vector and then to compensate for image, the purpose of stabilizing the image sequence can be a- chieved. Experiments demonstrate that this method has a high image stabilization precision, and the up to 16 frame/s video output rate completely meets the real-time requirements.

Vehicular Electronic Image Stabilization System Based on a Gasoline Model Car Platform

Noise,vibration and harshness(NVH)problems in vehicle engineering are always challenging in both traditional vehicles and intelligent vehicles.Although high accuracy manufacturing,modern structural roads and advanced suspension technology have already significantly reduced NVH problems and their impacts;off-road condition,obstacles and extreme operating condition could still trigger NVH problems unexpectedly.This paper proposes a vehicular electronic image stabilization(EIS)system to solve the vibration problem of the camera and ensure the environment perceptive function of vehicles.Firstly,feature point detection and matching based on an oriented FAST and rotated BRIEF(ORB)algorithm are implemented to match images in the process of EIS.Furthermore,a novel improved random sampling consensus algorithm(i-RANSAC)is proposed to eliminate mismatched feature points and increase the matching accuracy significantly.And an adaptive Kalman filter(AKF)is applied to improve the adaptability of the vehicular EIS.Finally,an experimental platform based on a gasoline model car was established to validate its performance.The experimental results show that the proposed EIS system can satisfy vehicular performance requirements even under off-road condition with obvious obstacles.

Effects of cement content, polypropylene fiber length and dosage on fluidity and mechanical properties of fiber-toughened cemented aeolian sand backfill

Using aeolian sand(AS)for goaf backfilling allows coordination of green mining and AS control.Cemented AS backfill(CASB)exhibits brittle fracture.Polypropylene(PP)fibers are good toughening materials.When the toughening effect of fibers is analyzed,their influence on the slurry conveying performance should also be considered.Additionally,cement affects the interactions among the hydration products,fibers,and aggregates.In this study,the effects of cement content(8wt%,9wt%,and 10wt%)and PP fiber length(6,9,and 12 mm)and dosage(0.05wt%,0.1wt%,0.15wt%,0.2wt%,and 0.25wt%)on fluidity and mechanical properties of the fibertoughened CASB(FCASB)were analyzed.The results indicated that with increases in the three aforementioned factors,the slump flow decreased,while the rheological parameters increased.Uniaxial compressive strength(UCS)increased with the increase of cement content and fiber length,and with an increase in fiber dosage,it first increased and then decreased.The strain increased with the increase of fiber dosage and length.The effect of PP fibers became more pronounced with the increase of cement content.Digital image correlation(DIC)test results showed that the addition of fibers can restrain the peeling of blocks and the expansion of fissure,and reduce the stress concentration of the FCASB.Scanning electron microscopy(SEM)test indicated that the functional mechanisms of fibers mainly involved the interactions of fibers with the hydration products and matrix and the spatial distribution of fibers.On the basis of single-factor analysis,the response surface method(RSM)was used to analyze the effects of the three aforementioned factors and their interaction terms on the UCS.The influence surface of the two-factor interaction terms and the three-dimensional scatter plot of the three-factor coupling were established.In conclusion,the response law of the FCASB properties under the effects of cement and PP fibers were obtained,which provides theoretical and engineering guidance for FCASB filling.

Real-Time Digital Image Stabilization Based on Contour

A new digital image stabilization method is proposed for real-time application based on image contour. The image intensities are projected to several gray levels by thresholding before extracting contour points. Matching position could be found using these contour points. All pixels are still used for refined matching near the matching position. This algorithm is more robust against changes in illumination and noise affection. The adaptive global motion judgement can remove the affection of intruding object. All those are realized on normally available PC.

Electronic stabilization of catadioptric panoramic image

An effective algorithm of electronic image stabilization （EIS） of catadioptric panoramic imaging system for track robots is presented. The key techniques of this algorithm are as follows：① A model of electronic image stabilization is built by analyzing the imaging theory and the principle of EIS, and the image shift function of unwrapped panoramic image is deduced;② The relationship equation between motion estimation parameters of annular panoramic image and motion estimation parameters of unwrapped panoramic image is developed according to the constrained aspect ratio of real objects, motion parameters of annular panoramic image are firstly estimated, and then motion parameters among the image shift function are carried out according to the relationship equation;③ An excessive stabilization threshold is presented to prevent the phenomena of excessive stabilization, and the Kalman filtering is adopted to smooth the image sequences. Numerical experimental results show that this algorithm can effectively smooth out the unwanted motion and follow the intentional camera movement under certain resolutions.

Development of Medical Informatization in the Era of Big Data

The purpose of this paper is to discuss the development of medical informatization in the era of big data.Through literature review and theoretical analysis,the development of medical informatization in the era of big data is deeply discussed.The results show that medical informatization has developed rapidly in the era of big data,and its role in clinical decision-making,scientific research,teaching,and management has become increasingly prominent.The development of medical informatization in the era of big data has important purposes and methods,which can produce important results and conclusions and provide strong support for the development of the medical field.

岩土材料中冰分布状态的冷冻电镜表征方法

为从微观角度定量描述冰在岩土材料中的分布特征,基于冷冻电镜技术提出了一种微观尺度的实验表征方法。针对不同冰饱和度人造岩芯样品的二次电子图像和能谱分析图,通过元素含量分布、升华前后图像对比确认了冰在岩土材料中的分布状态。随着冰饱和度的增加,骨架孔隙被冰填充、骨架颗粒表面被冰包裹区域增大,样品断面更密实平整,岩土骨架的堆积结构特征变弱。在背散射电子图像中,冰的图像比岩土骨架亮度低、灰度高,基于此构建了冰饱和度的数字图像计算方法。该方法计算的升华前冰饱和度与样品预制冰饱和度偏差小于5%,验证了其可靠性。

无人机稳像系统研究综述

针对无人机在飞行过程中会受到机身或环境的影响而造成航拍设备的抖动,对面向无人机平台的稳像系统进行分析。在简要介绍研究背景的基础上,主要从机械稳像和电子稳像2方面进行展开,系统介绍国内外研究现状和多种典型的稳像算法,分析无人机稳像系统未来可能发展的研究方向。结果表明,该研究对无人机航拍图像的增稳及不同场景下稳像方法的选取具有一定的指导作用。

柔性电子复合薄膜贴附于仿真皮肤上的延展性研究

为评价柔性应变传感器应用于人体皮肤不同工况下的延展性,制备了一种马蹄形金属导线-PDMS基底复合结构的柔性电子复合薄膜,选择邵氏硬度为10的双组分加成型硅胶作为仿真皮肤材料进行离体实验。首先,利用数字图像相关(DIC)方法获得样品贴附在不同厚度仿真皮肤上拉伸变形过程中的位移场与Von Mises应变场;其次,提出应变均值M与断裂伸长率e作为评价指标定量表征样品的延展性,分析仿真皮肤厚度与环境温度对延展性的影响。结果表明,皮肤厚度与环境温度变化对柔性电子复合薄膜延展性均有显著影响,当皮肤厚度为2 mm,环境温度为40℃时,样品延展性最佳,断裂伸长率达到145%。该研究定量分析了柔性电子薄膜在不同应用工况下的延展性,为柔性应变传感器的强度设计提供参考。

医疗隐私应用场景下:数字水印技术的多功能应用与研究

数字水印技术的应用为医疗信息安全在版权保护、身份验证、内容认证和篡改定位与恢复等功能上提供了强有力的支持。为了推动多功能水印技术在医疗信息领域进一步的发展,首先对医疗信息中容易修改的电子病历和医疗影像进行深入分析;针对不同医疗隐私场景中存在的问题,根据数字水印技术的功能特性进行归纳分类;最后,论述不同的水印特性在医疗领域不同应用场景下的表现并进行展望,旨在为数字水印技术在医疗领域更好地应用提供参考。

面向扑翼飞行机器人的电子稳像算法设计

在扑翼飞行机器人的飞行过程中,由于其特有的驱动方式,机身存在周期性的俯仰和滚转运动,导致航拍视频出现抖动,影响成像效果的清晰度和稳定性.为了解决这一问题,本文提出了一种基于ORB和滑动均值滤波的电子稳像算法,用于在线消抖处理.首先,针对扑翼飞行机器人航拍图像的抖动周期与机翼扑动周期相一致的特性,设计了一种估计算法来根据图像特征估计机翼扑动周期.这一算法能够更准确地捕捉到抖动的周期性特征,为后续的稳像处理提供了重要参数.其次,提出了一种与扑动周期相关联的运动滤波算法,能够根据不同飞行工况对滤波参数自适应地进行动态调整.本文提出的算法优点在于能够根据扑翼飞行机器人实际飞行情况实时调整参数,从而更好地适应不同的飞行工况,进一步提高了稳像效果.最后,为了验证算法的可行性和稳定性,将视觉成像装置搭载在扑翼飞行机器人上进行了飞行实验.实验结果表明,相较于常用的电子稳像算法,本文所设计的算法在扑翼飞行机器人中表现出更好的稳像效果.最后,总结了本文所提出的算法优点,并对未来研究方向做出了展望.

数字图像测量技术在土石围堰动态施工中的应用研究

土石围堰是关系到水利枢纽工程建设全局的重要临时性工程项目,一旦出现问题,后果十分严重。针对传统的测量仪器法和GPS法进行围堰动态监测主要有效率低、工作量大、成本高等缺点。提出运用数字图像测量技术,有效解决多点测量的问题,实现实时跟踪监测变形,已成功应用于海堤建设项目围堰边坡的动态位移监测,实现堰坡位移安全监测与预警等功能。

数字化时代“数字图像处理”混合式教学模式的应用研究

在数字化时代背景下,以电子信息工程专业课程“数字图像处理”的教学为例,引进了混合式教学模式,“以学生为主体,以教师为主导”的教学理念为指导,利用蓝墨云班课教学平台,对教学方式进行“线上+线下”课程模式优化,并探讨了特色应用资源的融合模式,满足学生自主学习和课程与时俱进的多维度教学需求,为电子信息类专业课程混合式教学模式改革提供有益参考。

聚丙烯纤维增强水稳基层抗裂性能评价及微观机理

为提升水泥稳定碎石基层的抗裂耐久性,可在其中加入不同掺量的聚丙烯纤维。通过试验测试不同养护龄期下试件的劈裂抗拉强度,确定了最佳聚丙烯纤维掺量;采用宏观力学性能试验,分析了聚丙烯纤维的掺入对试件抗压强度、劈裂抗拉强度、抗弯拉强度的影响;对掺入和未掺入聚丙烯纤维的两组试件进行了半圆弯曲试验,并利用数字图像相关(digital image correlation,DIC)技术对加载过程进行了全时域监测对比,得到其位移时间曲线。试验结果表明:水稳碎石基层中聚丙烯纤维的最佳掺量为0.10%,聚丙烯纤维的掺入能提升水稳基层的宏观力学性能,延缓水稳基层裂缝的发展,并通过应力传递降低水稳基层的应变集中及位移激增。

基于数字图像防剽窃系统的信息化教学设计

阐述一种基于Matlab的数字图像防剽窃系统,该系统采用正交拉丁方的原理进行置乱变换和反变换,自动保存加密图像和解密图像,并可根据加密需求自主修改变换次数和参数设置,从而有效避免电子作业抄袭的问题。

Images of triple gas electron multiplier with pixel-pads

Testing of a triple gas electron multiplier （GEM） with pixel-pads is described. Images by scanning and suspending radioactive sources were obtained by using 96 channels digital data acquisition （DAQ） system which was composed of 96 8×8 mm2 pads and associated electronics channels.

水泥稳定碎石细观骨架结构特征研究

为了探究不同因素对水泥稳定碎石细观骨架结构的影响,应用CT扫描和数字图像处理技术,从细观角度提出新的水泥稳定碎石骨架结构评价指标,并进行有效性验证,利用该指标对不同成型方式下的混合料骨架结构进行评价。结果表明:该指标评价结果与工程实际和以往研究相符合,旋转压实成型方式在达到一定压实次数后骨架指标趋于稳定,振动成型达到一定的振动时长后获得较好的骨架结构,继续振动反而会导致集料竖向离析。旋转压实能获得较好的横断面骨架指标,振动成型获得的纵断面指标更优。用该指标评价不同成型方式的骨架特征具有一定指导意义。