共查询到20条相似文献,搜索用时 78 毫秒
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基于狭缝光照明的3D-LCD光学结构分析 总被引:6,自引:0,他引:6
本文在分析立体视觉机理的基础上,介绍了一种以液晶显示器为基础的平板立体显示器。利用狭缝背光源照明液晶层,使得显示在液晶层的纵向条形左右图像,分别被观看者的左右眼观看到,从而形成自由立体图像。本文从光学的角度,对立体视觉机理、立体显示原理、用于液晶立体显示的狭缝背光源的光学原理作了详细分析。 相似文献
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光栅式自由立体显示器光学构成的理论研究 总被引:9,自引:3,他引:9
自由立体显示器是新一代图像显示器件之一,其中基于光栅的立体显示器具有许多卓越的优点。本文首先分析了光栅式自由立体显示器的光学结构,在此基础上,进一步论述了狭缝式自由立体显示器的光学模型。 相似文献
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立体显示可以为观察者提供场景中物体的深度信息,并使观察者有身临其境的感觉。为了搭建低成本可应用于辅助远程操纵的实时画面立体显示系统原型,利用双目网络摄像头和立体显示设备,在未对相机标定情况下,采用非标定立体校正的方法,设计了一套实时立体显示系统,提供了色差式和快门式2种立体显示方式,并通过MOS方法对系统的立体显示效果进行了主观评价。实验结果表明,经过立体校正后的左右摄像头图像行是对准的。在使用了多线程技术对左右图像并行处理的情况下,系统输出立体图像的帧频从21Hz提高到了30Hz,满足实时性的要求。在立体显示效果评价中,色差式和快门式立体显示分别得到了7.67分和9.08分,说明立体效果基本令人满意。 相似文献
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为解决传统可视密码像素膨胀及分存图像无意义等问题,文中提出了一个具有掩盖图像的(2,2)可视密码方案。方案中密图为黑白反色图像,利用半色调技术将两个灰度图像处理后的半色调图像作为掩盖图像,根据密图修改掩盖图像生成分存图像,叠加分存图像恢复密图。方案符合可视密码解密简单的特性且分存图像有意义,没有引入任何像素膨胀。 相似文献
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Krinidis S 《IEEE transactions on image processing》2012,21(4):2178-2186
The performance of a number of image processing methods depends on the output quality of a distance transformation (DT) process. Most of the fast DT methodologies are not accurate, whereas other error-free DT algorithms are not very fast. In this paper, a novel, fast, simple, and error-free DT algorithm is presented. By recording the relative x- and y-coordinates of the examined image pixels, an optimal algorithm can be developed to achieve the DT of an image correctly and efficiently in constant time without any iteration. Furthermore, the proposed method is general since it can be used by any kind of distance function, leading to accurate image DTs. 相似文献
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Ji Zhen Zhang Jihong Xie Weixin 《电子科学学刊(英文版)》2001,18(4):375-381
This letter presents a method for digital image watermarking for copyright protection. This technique produces a watermarked image that closely retains the quality of the original host image while concurrently surviving various image processing operations such as lowpass/highpass filtering, lossy JPEG compression, and cropping. This image watermarking algorithm takes full advantage of permutation and 2-D barcode (PDF417). The actual watermark embedding in spatial domain is followed using permutated image for improving the resistance to image cropping. Much higher watermark robustness is obtainable via a simple forward error correction technique, which is the main feature of PDF417 codes. Additional features of this technique include the easy determination of the existence of the watermark and that the watermark verification procedure does not need the original host image. The experimental results demonstrate its effectiveness. 相似文献
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用于航空遥感的二维像移补偿镜的设计 总被引:1,自引:0,他引:1
在航空遥感中,由于振动、飞行器的运动及相机摆动等原因,相机在曝光时,被摄物影像与CCD之间存在着相对运动,带来了成像模糊及拖尾效应,此即像移.其存在对图像质量及精度都有很大影响,因此,怎样减少像移就成为提高遥感设备性能的重要手段。本文介绍了压电式二维像移补偿镜的工作原理,详细描述了其结构的设计以及功能的实现.设计了PZT压电陶瓷驱动补偿镜的柔性铰链平台,实现了补偿镜对CCD成像像移的二维补偿,并对像移补偿镜模型进行了性能分析,通过实验验证了像移补偿镜的性能. 相似文献
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Sang-Hoon Seo Azimi-Sadjadi M.R. Bin Tian 《IEEE transactions on image processing》2000,9(11):1967-1972
A two-dimensional (2-D) least squares (LS)-based filtering scheme for high fidelity stereo image compression applications is introduced in this correspondence. This method removes the effects of mismatching in a stereo image pair by applying the left image as the reference input to a 2-D transversal filter while the right image is used as the desired output. The weights of the filter are computed using a block-based LS method. A reduced order filtering scheme is also introduced to find the optimum number of filter coefficients. The principal coefficients and the disparity vectors are used together with left image to reconstruct the right image at the receiver, The proposed schemes are examined on a real stereo image pair for 3D-TV applications and the results were benchmarked against those of the block-matching method. 相似文献
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基于二维DCT的图像压缩编码及其实现 总被引:1,自引:0,他引:1
DCT变换是图像压缩的一项重要技术,如何准确、快速进行图像压缩一直是国内外研究的热点。主要介绍基于DCT变换的图像压缩编码算法,给出具体的实现方法和步骤,并用Matlab进行了算法仿真。实验结果表明,该算法实现简单,在很大压缩范围内,都能得到很好的重建图像质量,满足不同场合要求不同图像质量的实际需要。这里利用Matlab做仿真实验,方法简单、速度快且误差小,大大提高了图像压缩的效率和精度。 相似文献