共查询到20条相似文献,搜索用时 125 毫秒
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引言 鉴于黑白图象被彩色化后能大大提高其分辨率以及密度假彩色化方法越来越广泛的在科研和生产当中的应用,我们在1983年将我系张静江、王书颖、刘大禾等同志在1982年研究成功的“光栅编码位相型图象的假彩色化”方法排成一个新实验,安排在学生的光学专业选修课及进修教师的实验课中.该方法仅用一张黑白图片,经光栅一次编码,并且将其作显影、漂白处理后,再在白光处理光路中进行分频处理,即可在输出面上得到等密度假彩色图象.该方法不仅操作简单,而且所得彩色图象清晰度高、颜色丰富.选用不同的级还能使图象变成不同的颜色,可以收到不同的处… 相似文献
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本文论述用频谱面彩色滤波方法对图像进行实时的频谱和密度假彩色编码.频谱假彩色编码是用二维环形彩色滤波器进行滤波来完成的.密度假彩色编码是用双色相衬滤波器使图像反转而实现的.对ERTS(地球资源技术卫星)遥感图片和航空遥感图片进行了直接处理,实验结果证明该方法有效. 相似文献
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由于彩色图片比黑白图片易于识别,所以,黑白图像的假彩色合成受到很大的注意。黑白图像的假彩色编码主要有两类技术,即按空间频率的编码和按密度的编码。目前,己有人研制成多种光学假彩色编码技术。[1-4]利用白光系统作黑白图像的假彩色编码有其独特的优点。它不需要贵重的多色激光器,没有激光引起的散斑噪声,色彩鲜明。本文阐述了用矩形光栅作x—射线片密度假彩色编码的理论与实验。从频谱分析的观点出发,分析了用矩形光栅对图形进行编码时,它的高级谱所形成的像,与其零级谱所形成的像对比度相反的原理。[5]解释了实现对比度反转的条件.给出了在白光系统中,对x—射线胸片和细胞切片编码的结果。 相似文献
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图象等密度假彩色编码的一种光学方法 总被引:1,自引:0,他引:1
本文用光学方法实现了图象等密度假彩色编码。采用一种四灰阶矩形剖面的半色调屏,对输入图象进行脉冲频率调制。在白光滤波系统的光源狭缝平面上加滤光片进行假彩色编码。半色调屏采用泰保(Talbot)效应自成像的方法制作。屏的空间频率达12.5lp/mm,一维空间带宽积达750。用此方法处理遥感照片取得了良好的结果。 相似文献
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本文用一块Ronchi栅将待处理物进行一次曝光,根据编码片“透过率高处光栅调制度反而低”的特性,当只让光栅零级和一级处的频谱通过时,分别得到正、负像,从而实现了对比度反转.再进行颜色滤波,即可实现假彩色密度编码. 相似文献
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基于空间部分相千光成像理论,分析了编码相位片形成的假彩色及振幅光栅和相位光栅对这种假彩色的调节作用,求得了精确解. 相似文献
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Induction motors are the most commonly used prime movers in industries. These are subjected to various environmental, thermal and load stresses that ultimately reduces the motor efficiency and later leads to failure. Inter turn fault is the second most commonly observed faults in the motors and is considered the most severe. It can lead to the failure of complete phase and can even cause accidents, if left undetected or untreated. This paper proposes an online and non invasive technique that uses infrared thermography, in order to detect the presence of inter turn fault in induction motor drive. Two methods have been proposed that detect the fault and estimate its severity. One method uses transient thermal monitoring during the start of motor and other applies pseudo coloring technique on infrared image of the motor, after it reaches a thermal steady state. The designed template for pseudo-coloring is in acquiescence with the InterNational Electrical Testing Association (NETA) thermographic standard. An index is proposed to assess the severity of the fault present in the motor. 相似文献
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Spatial frequency pseudo-coloring is performed by simply inserting a binary filter in the Fourier plane of a spatially coherent, white light optical processing system. The range of encoded spatial frequencies can be extended by using multiple filters or by using sampled input objects. 相似文献
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Greg J. Gartland 《Journal of sound and vibration》2009,320(3):491-495
Echo reduction is a measure of a materials ability to reduce the reflection of acoustic energy and is a typical measurement performed in acoustic tanks. In this paper, an inverse method is developed to estimate the complex dilatational wave speed of a material using echo reduction data. The theory of echo reduction is briefly discussed, the inverse method is developed and then an experiment is conducted to illustrate the technique. The real parts of the resultant wave speed measurements are then compared to measurements using identification of discrete wavelengths. It is shown that the two measurement techniques produce extremely similar estimates. 相似文献
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本文利用全息飞光记录的方法实现了全息相干快门超高速摄影。用CPM染料激光器输出的亚皮秒级超短激光脉冲,记录了光波聚焦的动态过程,同时提出了这种新技术分幅频率的计算方法,文中所述实验的分幅频率为1012f/s,达到了目前高速摄影的最高水平。 相似文献
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报告了我国开展射线检测原油管道垢厚的研究进展. 介绍了γ射线透射检测垢厚的基本原理、 模拟实验装置及主要研究成果. 研究表明, 研制透射型测垢仪是可行的. 另外, 还给出了南京大学关于表面型中子测垢仪和γ射线测垢仪的初步预研结果. 相似文献
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A novel algorithm based on a phase modulation and demodulation technique for multiple self-mixing interferometry was proposed in this paper. This algorithm can measure nanoscale vibration in real time and enhance the measurement resolution of a multiple self-mixing interferometer twofold compared with that of a self-mixing interferometer. In this paper, the principles of the method were described in detail, and a phase equation for multiple self-mixing interferometry was derived. Experiments were confirmed by conducting a series of experiments with different amplitudes, different signal-to-noise ratios, and different vibration waveforms. The experimental results showed that the algorithm can rapidly demodulate vibration in real time and indicated good agreement between theory and experiment. 相似文献