共查询到17条相似文献,搜索用时 93 毫秒
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使用振幅调制和功率谱相减的联合变换相关器作多目标检测 总被引:4,自引:2,他引:2
提出一种使用振幅调制和功率谱相减的联合变换相关器作多目标检测,这一方法对联合功率谱作了修正,先将联合功率谱减去纯输入景物的功率谱和参考图象的功率谱,再将所得修正的联合功率谱乘以振幅调制滤波函数。分析和量化了输入景物噪声对联合变换相关器性能的影响。这种方法比条纹调节的联合变换相关器和修正的条纹调节的联合变换相关器能产生更好的相关输出和适应输入景物噪声的能力。 相似文献
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联合击中击不中变换相关器 总被引:9,自引:3,他引:6
将联合击中击 中变换相关器用于二值图像的目标识别。与常用的联合变换相关器相比,联合击中击不中变换相关器对联合变换相关器输入图像和参考图像进行互补编码。编码的目的在于通过联合变换相关器来一步实现形态学中的击中击不中变换。 相似文献
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研究了液晶光阀(LCLV)作为位相调制器的特性,并用它实现了二元联合变换相关器. 相似文献
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基于双二次微分的联合变换相关识别 总被引:1,自引:0,他引:1
提出一种提高联合相关识别的有效方法,该方法通过对识别图像和联合变换功率谱分别进行二次微分,抽取识别图像的特征信息,增强联合变换功率谱中调制条纹的对比度和调制条纹的结构,有效地提高了联合变换相关器的相关输出;在此基础上,构造了基于双二次微分的1f实时光电联合相关识别系统,实验结果表明:该方法较二元联合变换相关,提高了图像相关识别能力 相似文献
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利用液晶光阀实现二值化联合变换相关器的研究 总被引:4,自引:0,他引:4
二值化联合变换相关器,通过对联合变换的功率谱进行二值化操作可以提高联合变换相关器的图像识别。本文正是基于此观点,首次提出利用液晶光阀本身的饱和区实现反转二值化联合变换功率谱。 相似文献
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描述了一种基于电寻址空间调制器的二值化联合变换相关器,该系统主要包括阴极射线管耦合液晶光阀(CRT-LCLV)、CCD摄象机和COMPAQ386计算机,文中在理论分析的基础上给出了计算机模拟和初步的实验结果,表明该相关器具有良好的识别性能。 相似文献
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Chau-Jern Cheng 《Optical Review》2001,8(6):431-435
An image-encrypted joint transform correlator for pattern recognition is proposed and evaluated. The correlator performs twofold
correlation for recognizing the primary image and cipher, and the encrypting cipher acts to enhance or inhibit the correlation
peak if the cipher is correctly input. By incorporating the original image with an appropriate cipher, the correlator achieves
better pattern discrimination and is robust against distortion. Simulation results show that the pixel number and the cell
size of cipher affect the characteristics of the correlator. 相似文献
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实时光电混合联合变换相关器单元的实验研究 总被引:11,自引:3,他引:8
本文根据联合变换相关的原理,提出了一种实时光电混合联合变换相关器,它采用一个液晶光阀作为输入器件,用另一个液晶光阀记录和显示联合功率谱,所给出的实验结果证实了该系统设计及性能分析的正确性。 相似文献
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Sliced orthogonal nonlinear generalized decomposition based fringe-adjusted joint transform correlation 总被引:1,自引:0,他引:1
A sliced orthogonal nonlinear generalized (SONG) decomposition based version of modified fringe-adjusted joint transform correlator (MFJTC), SBFJTC, is proposed. In SBFJTC scheme, the reference and input scenes are decomposed into a set of binary slices through SONG decomposition. MFJTC filtering of each pair of binary slices, corresponding to the same gray level of reference and input scene, is performed and then the outputs are added. Numerical simulations show that the proposed scheme delivers a better correlation performance and robustness to the white additive Gaussian noise, substitutive noise and nonoverlapping noise than that of both of the FJTC and the MFJTC. 相似文献
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Multitarget detection using a hybrid optical joint transform correlator with power spectrum subtraction is proposed. This architecture is a programmable single spatial light modulator joint transform correlator. It consists of a liquid crystal display panel, an imaging lens, and a liquid crystal light valve to enhance resolution and space-bandwidth production. In this technique, it has two joint images in the input plane. In the second joint image, the reference image is contrast-reversal. With this technique, the second joint power spectrum is subtracted from the first joint power spectrum and the subtracted joint power spectrum is then taken the inverse Fourier transform. This technique is found to yield better correlation output performance than that of the classical joint transform correlator. Computer simulation results and the optical experimental results for input scene of the multitarget are given.The results have verified the correctness of the system design and performance analysis. 相似文献
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Quantised phase filters with binary low and high pass amplitude response: the effect of quantisation for scale and rotation input distortions 总被引:1,自引:0,他引:1
Triantafillos Koukoulas Rupert C.D. Young Chris R. Chatwin 《Optics and Lasers in Engineering》2005,43(9):963
In the field of optical pattern recognition, there are a large number of filters that possess identification capabilities for certain kinds of input distortions. The resolution of the spectral components plays an important role in the overall processing time of a correlator that may employ such filters. In this paper, two different techniques are discussed: low pass phase filtering and high pass phase filtering. This is achieved by binarizing the amplitude information which then allows certain frequencies to pass and others to be blocked. Their response to different kinds of input distortions is presented and the effect of phase quantisation is considered in detail. 相似文献
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1IntroductionFormultitargetdetection,thejointtransformcorelator(JTC)isanextremelyusefularchitecture[1].HowevertheclasicalJTCp... 相似文献