共查询到20条相似文献,搜索用时 156 毫秒
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基于智能化自动调焦的高级显微镜系统 总被引:4,自引:2,他引:2
在介绍与分析了国内外电子调焦系统的技术发展现状的基础上,提出了一种基于SSPD与8098单片微处理器自动调焦的整体技术方案,给出了基于图象高频成分统计的聚焦判识算法,在此基础上实现了反射式与透射式光学显微镜的自动调焦,同时与对与系统可靠性有关的其它相关相关问题,如光源稳定性、等问题,也进行了讨论。 相似文献
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本文用几何光学描述了离轴探测调焦误差信号与系统参数的关系,并与实验结果进行了比较。用作光盘存储调焦伺服取得了0.25μm的自动调焦精度。 相似文献
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一种用于数字成像的自动对焦系统 总被引:10,自引:0,他引:10
提出一种用于数字成像的自动对焦系统,它以CMOS为图像传感器,用DSP进行数据处理并控制驱动电路调整镜头的位置,达到准确自动对焦的目的。系统采用对焦深度法实现自动对焦,通过改变镜头的位置获得一系列模糊程度不等的图像,计算每幅图像的清晰度评价值构成对焦评价曲线;采用梯度函数作为评价标准来评价图像的清晰度;采用窗口选择技术控制对焦感兴趣范围,减少了数据处理量;对实验样机的测试表明,系统有较好的自动对焦性能,并解决了百叶窗问题,对透过玻璃窗户的目标仍然能正确对焦。 相似文献
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An acousto-optic tunable filter (AOTF) displays optical band broadening and sidelobes as a result of the coupling between the acoustic wave and optical waves of different wavelengths. These features were analysed by wave-vector phase matching between the optical and acoustic waves. A crossed-line test board was imaged by an AOTF multi-spectral imaging system, showing image blurring in the direction of diffraction and image sharpness in the orthogonal direction produced by the greater bandwidth and sidelobes in the former direction. Applying the secondary-imaging principle and considering the wavelength-dependent refractive index, focal length varies over the broad wavelength range. An automatic focusing method is therefore proposed for use in AOTF multi-spectral imaging systems. A new method for image-sharpness evaluation, based on improved Structure Similarity Index Measurement (SSIM), is also proposed, based on the characteristics of the AOTF imaging system. Compared with the traditional gradient operator, as same as it, the new evaluation function realized the evaluation between different image quality, thus could achieve the automatic focusing for different multispectral images. 相似文献
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It has been observed that retroreflective materials can be used in combination with beam splitters to produce real images. This is practical on a large size scale but has a maximum optical efficiency of 25%. Conversely, curved reflectors efficiently produce real images, but their cost increases very rapidly with size. We introduce a new imaging method, which combines the advantages of both systems, through the use of a linear retroreflective film. This material is retroreflective in one plane and conventionally reflective in the perpendicular plane. The net result is an efficient real image system that can have unlimited extent in one transverse direction, and which can be inexpensively manufactured on a large scale. 相似文献
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Linear astigmatism of a confocal off-axis reflective imaging system when the object plane is tilted and located at a finite distance from the imaging system is derived. We show that linear astigmatism can be eliminated by proper configuration of the parent mirror axes in confocal off-axis two-mirror systems. The tilt angle of the image plane is also derived. The developed theory is verified by ray-tracing analysis of an example system. 相似文献
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A method to compute high-resolution three-dimensional images based on integral imaging is presented. A sequence of integral images (IIs) is captured by means of time-division multiplexing with a moving lenslet array technique. For the acquisition of each II, the location of the lenslet array is shifted periodically within the lenslet pitch in a plane perpendicular to the optical axis. The II sequence obtained by the detector array is processed digitally with superresolution reconstruction algorithms to obtain a reconstructed image, appropriate to a viewing direction, which has a spatial resolution beyond the optical limitation. 相似文献
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Borkowski A Zalevsky Z Marom E Javidi B 《Journal of the Optical Society of America. A, Optics, image science, and vision》2011,28(4):566-575
In this paper, we address the geometrical resolution limitation of an imaging sensor caused by the size of its pixels yielding insufficient spatial sampling of the image. The spatial blurring that is caused due to inadequate sampling can be resolved by placing a two-dimensional binary random mask in an intermediate image plane and shifting it along one direction while keeping the sensor as well as all other optical components fixed. Out of the set of images that are captured, a high resolution image can be decoded. In addition, this approach allows improved robustness to spatial noise. 相似文献
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智能化红外成像光斑测试仪的研究 总被引:1,自引:0,他引:1
研制成一种集光、机、电、算于一体的智能化的红外成像光斑测试仪。该测试仪以1.064mm的激光光源模拟无穷远的点光源, 利用红外面阵CCD自动寻找测量目标在不同视场角下的最佳像面位置,对同波段红外导引头光学组件的成像光斑进行检测。实时采集的信号通过RS-232串口通讯输入计算机,采用重心法对所采集的光斑信号进行数据处理,分析光源通过被检测系统后,在其焦平面上的成像光斑的质量。所采集到的光斑信号可以三维图形、截面图或数据表的形式进行显示、输出。测试结果表明:系统重复性好(重复性误差小于2%)、可靠性高、自动化程度高。 相似文献
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为了研究水下热扰动环境对光学成像的畸变、模糊等失真问题的影响,利用水下图像的灰度分布、结构相似性图像度量(SSIM)和归一化最大灰度梯度清晰度评价函数来评价目标图像在径向和轴向上的畸变和模糊等失真程度,得到水下热扰动对光学成像变化的规律。实验数据表明,随着成像系统与目标的轴向距离增加,图像的畸变和模糊程度越来越大。轴向距离L1=500 mm时,对应图像的SSIM值优于0.7,归一化清晰度值优于0.8;轴向距离L3=1500 mm时,对应图像的SSIM值低于0.2,归一化清晰度值不足0.6;此外,轴向距离L1时,成像在径向上,距离发热源越近,边缘漂移越大,即成像图像畸变越严重;最后,相同轴向和径向条件下,目标在不同时刻的图像SSIM和归一化清晰度值有优劣,该结论可为后续的水下图像复原提供参考。 相似文献