共查询到20条相似文献,搜索用时 359 毫秒
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卡西欧EXILIMEX-Z70采用1/2.5英寸720万的CCD影像传感器,最大分辨率为2816×2112像素,配备了卡西欧独创的AntiShakeDSP电子防震系统。等效焦距为38 ̄114mm的3倍光学变焦镜头,最大光圈F3.1 ̄5.9。感光度范围为ISO50 ̄400,快门速度为4 ̄1/2000s,2.5英寸11.5万像素的LCD液晶显示屏,700mAh的NP-20型锂电池,使用SD/MMC卡作为存储介质。机身尺寸为95.2mm×60.6mm×19.8mm,重量约118g。三星NV10三星NV10采用一块1/1.8英寸1010万像素的CCD影像传感器,最大分辨率为3648×2736像素。相当于35mm相机35 ̄105mm的3倍光学变焦施耐德镜头,… 相似文献
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数字射线成像中射线对面阵 CCD图像传感器影响的研究 总被引:1,自引:0,他引:1
目的 研究数字射线成像系统中X射线对CCD图像传感器及其系统成像质量的影响方式、特点以及图像质量的改善算法。方法 利用实验手段,对CCD图像传感器区域上的受摄像影响的像素数进行了统计,并对统计的结果进行了分析。结果与结论 在DR系统中,x射线对CCD产生的影响直接造成了图像上的单像素、高幅值的尖峰脉冲,针对这种噪声特点,文中介绍了两种滤波算法。 相似文献
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卤化银胶片与CCD的细部分辨能力中国乐凯胶片公司(保定071054)唐志健电子成像技术的迅猛发展对卤化银胶片既是冲击又是促进。卤化银胶片集影像俘获和影像显示于一身,不但价格便宜而且影像质量好。电于成像尽管价格昂贵,但由于成像迅速,便于存储、处理和传送... 相似文献
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本刊讯 北京杜高影像设备有限公司自行开发的杜高DIPS Pro80型数码电子片夹已于2003年11月初通过国家照相机质量监督检验中心检测,该数码电子片夹是目前首家通过国家权威部门检测的完全由国内自主开发的LCD式数码电子片夹。 杜高DIPS Pro80型数码电子片夹是由透射式LCD、主控制箱及图像处理软件等组成,其LCD虽然是80万像素的,但通过4次微移动技术,实际照片扩印分辨率近320万像素。 杜高DIPS Pro80型数码电子片夹色密度均匀性高,中小画幅照片成像清晰,性能稳定,性价比高,且基本上可与所有传统彩扩进行匹配,是传统彩扩机… 相似文献
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一、摄影影像与电子影像的成像过程及显示的对比 在胶片摄影过程中,摄影系统通过摄影镜头将原件拍摄到胶片上,使胶片乳剂层中的卤化银晶体感光,胶片既是影像的摄取介质,又是影像的存储介质。 在电子成像系统中,摄影系统通过摄影镜头将原件捕获 相似文献
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经过160余年的发展,传统的卤化银感光材料影像技术已取得辉煌的进步。卤化银感光材料可同时具备传感、记录和显示各种各样图像的功能,而且质量令人满意。经过几代人的科研努力,已达到极高水平,如:高感光度、高解像力,大信息容量、彩色还原真实等等。面临各种新涌现的影像技术体系的巨大进展,本文扼要分析了现代各种不同影像技术的概况,并提示了其发展前景。 相似文献
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一种新型的大动态范围CCD相机视频信号处理电路 总被引:1,自引:1,他引:0
由于目前的CCD尤其科学级CCD的动态范围高达105:1,甚至106:1,此时若要满足ADC的动态范围大于CCD相机的动态范围,则必须选择分辨力为18~20bit的ADC,而航天级或高等级的高分辨力ADC较少且价格昂贵。本文利用CCD相机系统的噪声谱密度跟信号大小有密切关系这一特点,对于强光信号和弱光信号采用不同的信号处理链,从系统通道增益的角度阐述了低分辨力ADC实现高分辨力模数转换的原理及硬件实现方案,最后通过实验室成像测试验证,实验结果表明,用低分辨力A/D转换器采用粗细量化相结合方式实现了高分辨力模数转换,并提高了CCD相机的动态范围。 相似文献
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高新科技产品数码CCD照相机推向市场,在专业摄影领域应用范围日益广泛情况下,常规照相机使用的卤化银多层彩色胶片的应用发展和远景成为受关注的问题。本文根据国内外专家的论述加以分析,认为在业余摄影范围里数码相机的应用存在局限性,较难普遍普遍推广应用。卤化银多层彩色片适合广大业余摄影者应用,而且存在更多改善照相性能的潜力,它与数码照相机将是共存共荣,相辅相成。 相似文献
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近年来,数码相机新技术应用进展神速,使数码相机产品功能越来越多、效率高、操作方便、经济实惠、性价比高等。本文详加介绍,如:单反相机已成为热点,千万像素成为入门机型,分辨率更高而尺寸更小的CMOS正在取代CCD作影像传感器,更轻、更薄而节能的有机发光二极管成为显示屏主流等。 相似文献
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A micro-channel plate detector with wedge and strip anode can be used for visible and ultraviolet light imaging. In this paper, the imager electronics are designed in order to process specific output charge characteristics. The original signal output from the detector is shaped into a Gaussian pulse signal, and a digital Constant Fraction Discriminator is used to judge the arrival time of the pulse. The resolution of the electronic output image is 1024?×?1024, and the position decoding accuracy is 1 pixel. The experimental imaging resolving power of the detector is as high as 70?µm. 相似文献
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Lee SH Park NC Park KS Park YP 《Journal of the Optical Society of America. A, Optics, image science, and vision》2010,27(10):2304-2312
We propose an image-resolution upscaling method for compact imaging systems. The image resolution is calculated using the resolving power of the optics and the pixel size of a digital image sensor. The resolution limit of the compact imaging system comes from its size and the number of allowed lenses. To upscale the image resolution but maintain the small size, we apply wavefront coding and image restoration. Conventional image restoration could not enhance the image resolution of the sensor. Here, we use the upscaled image of a wavefront-coded optical system and apply an image-restoration algorithm using a more precisely calculated point-spread function (PSF) as the deconvolution filter. An example of a wavefront-coded optical system with a 5-megapixel image sensor is given. The final image had a resolution equivalent to that of a 10-megapixel image using only four plastic lenses. Moreover, image degradation caused by hand motion could also be reduced using the proposed method. 相似文献
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Mico V Limon O Gur A Zalevsky Z García J 《Journal of the Optical Society of America. A, Optics, image science, and vision》2008,25(5):1115-1129
The ability to improve the limited resolving power of optical imaging systems while approaching the theoretical diffraction limit has been an attractive discipline with growing interest over the last years due to its benefits in many applied optics systems. This paper presents a new approach to achieve transverse superresolution in far-field imaging systems, with direct application in both digital microscopy and digital holographic microscopy. Theoretical analysis and computer simulations show the validity of the presented approach. 相似文献
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Optimized algorithm for the spatial nonuniformity correction of an imaging system based on a charge-coupled device color camera 总被引:1,自引:0,他引:1
We present an optimized linear algorithm for the spatial nonuniformity correction of a CCD color camera's imaging system and the experimental methodology developed for its implementation. We assess the influence of the algorithm's variables on the quality of the correction, that is, the dark image, the base correction image, and the reference level, and the range of application of the correction using a uniform radiance field provided by an integrator cube. The best spatial nonuniformity correction is achieved by having a nonzero dark image, by using an image with a mean digital level placed in the linear response range of the camera as the base correction image and taking the mean digital level of the image as the reference digital level. The response of the CCD color camera's imaging system to the uniform radiance field shows a high level of spatial uniformity after the optimized algorithm has been applied, which also allows us to achieve a high-quality spatial nonuniformity correction of captured images under different exposure conditions. 相似文献
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分辨率的匹配与均衡是数字影像高质量表现的关键。均衡匹配的方法是根据应用需要倒推获取加工该采用的分辨率以及辅之以必要的插值处理。确认输出设备是连续色调的还是非连续色调的,对分辨率的均衡至关重要。 相似文献