基于小波變換的匹配濾波器優(yōu)化設(shè)計(jì)及應(yīng)用研究
發(fā)布時(shí)間：2019-02-12 06:37
【摘要】：小型集成化和優(yōu)異穩(wěn)定的識別性能是光學(xué)相關(guān)器發(fā)展的兩個(gè)關(guān)鍵,本實(shí)驗(yàn)室提出利用純相位數(shù)字微透鏡代替物理透鏡構(gòu)成平面集成2f光學(xué)相關(guān)器,以壓縮體積、提高了系統(tǒng)的集成度,但識別率有所降低。為提高系統(tǒng)的識別性能,考慮到OTSDF匹配濾波器在光學(xué)相關(guān)器的畸變不變識別應(yīng)用中良好的識別效果,本文提出基于小波變換的OTSDF濾波器(W_OTSDF)算法,對其進(jìn)行了優(yōu)化設(shè)計(jì),將優(yōu)化設(shè)計(jì)的W_OTSDF濾波器應(yīng)用于平面集成2f光學(xué)相關(guān)識別系統(tǒng)開展理論和實(shí)驗(yàn)研究,利用小波變換的多尺度與帶通濾波特性,提高了系統(tǒng)進(jìn)行相關(guān)識別的相關(guān)輸出峰值強(qiáng)度和信噪比(SNR)。數(shù)值仿真驗(yàn)證了該優(yōu)化設(shè)計(jì)方案的可行性,實(shí)驗(yàn)上搭建實(shí)際光路在空間光調(diào)制器(SLM)上加載該匹配濾波器,實(shí)現(xiàn)了對待識別目標(biāo)的畸變不變識別。本論文的主要研究工作如下:(1)將小波變換與OTSDF相結(jié)合,提出了W_OTSDF濾波器的優(yōu)化設(shè)計(jì)算法。通過對小波變換和匹配濾波的理論分析,設(shè)計(jì)了適合平面集成2f光學(xué)相關(guān)識別系統(tǒng),能提高對畸變不變目標(biāo)識別的效果的W_OTSDF濾波器算法。(2)建立了平面集成2f光學(xué)相關(guān)器的仿真模型�；谄矫婀鈱W(xué)傳遞函數(shù)理論和平面集成2f光學(xué)相關(guān)器系統(tǒng)結(jié)構(gòu)參數(shù)限制,確定了系統(tǒng)的結(jié)構(gòu)參數(shù),建立了系統(tǒng)的MATLAB仿真模型,利用菲涅耳衍射和透鏡的相位調(diào)制特性模擬了平面集成2f光學(xué)相關(guān)器的識別過程。(3)將本文提出的W_OTSDF濾波器算法應(yīng)用于平面集成2f光學(xué)相關(guān)器中,自編程序模擬分析結(jié)果表明,優(yōu)化后的W_OTSDF濾波器比原OTSDF濾波器具有更好的識別效果。W_OTSDF濾波器在識別旋轉(zhuǎn)、縮放、旋轉(zhuǎn)縮放同時(shí)存在的畸變目標(biāo)時(shí),峰值相關(guān)能量比(PCE)、峰值旁瓣比(PSR)、SNR整體性能指標(biāo)與OTSDF濾波器識別性能指標(biāo)相比均有較大提高。同時(shí)對W_OTSDF濾波器的性能改善的機(jī)理進(jìn)行了分析。(4)搭建了平面集成2f光學(xué)相關(guān)器的等效實(shí)驗(yàn)光路,實(shí)驗(yàn)結(jié)果與仿真分析基本一致。在SLM上加載設(shè)計(jì)的W_OTSDF濾波器來驗(yàn)證濾波器對畸變目標(biāo)的識別效果,實(shí)驗(yàn)結(jié)果表明:對[-48°,+44°]范圍內(nèi)的旋轉(zhuǎn)畸變目標(biāo)、[60%,148%]的縮放畸變目標(biāo)以及同時(shí)存在旋轉(zhuǎn)角度為[-32°,+36°]和縮放尺度[72%,134%]的畸變目標(biāo),該匹配濾波器都有較好的識別能力。本文優(yōu)化設(shè)計(jì)的W_OTSDF濾波器較OTSDF濾波器在峰值相關(guān)能量比(PCE)、峰值旁瓣比(PSR)、SNR整體性能指標(biāo)均有較大提高,具有更好的識別效果,有利于提高集成化相關(guān)器系統(tǒng)的識別能力,該濾波器的優(yōu)化設(shè)計(jì)方案可普遍適用于平面集成化光學(xué)相關(guān)器系統(tǒng),對光學(xué)模式識別領(lǐng)域的發(fā)展和推進(jìn)光學(xué)相關(guān)器的實(shí)用化有一定的研究意義及應(yīng)用價(jià)值。
[Abstract]:Small-scale integration and excellent stable recognition performance are the two key points in the development of optical correlator. In order to compress the volume of optical correlator, we propose to use pure phase digital microlens instead of physical lens to form planar integrated 2f optical correlator. The integration of the system is improved, but the recognition rate is reduced. In order to improve the recognition performance of the system, considering the good recognition effect of the OTSDF matched filter in the distortion invariant recognition of optical correlator, this paper presents the OTSDF filter (W_OTSDF) algorithm based on wavelet transform, and optimizes its design. The optimized W_OTSDF filter is applied to the planar integrated 2f optical correlation recognition system for theoretical and experimental research. The multi-scale and band-pass filtering characteristics of wavelet transform are utilized. The correlation output peak intensity and signal-to-noise ratio (SNR).) of the system for correlation identification are improved. The feasibility of the optimal design scheme is verified by numerical simulation. The actual optical path is constructed to load the matched filter on the spatial light modulator (SLM), and the distortion invariant recognition of the target is realized. The main work of this thesis is as follows: (1) combining wavelet transform with OTSDF, the optimal design algorithm of W_OTSDF filter is proposed. Based on the theoretical analysis of wavelet transform and matched filtering, a plane integrated 2f optical correlation recognition system is designed. The algorithm of W_OTSDF filter can improve the recognition effect of distorted invariant target. (2) the simulation model of planar integrated 2f optical correlator is established. Based on the theory of planar optical transfer function and the limitation of structural parameters of planar integrated 2f optical correlator system, the structural parameters of the system are determined, and the MATLAB simulation model of the system is established. The recognition process of planar integrated 2f optical correlator is simulated by using Fresnel diffraction and phase modulation characteristics of lens. (3) the proposed W_OTSDF filter algorithm is applied to planar integrated 2f optical correlator. The simulation results show that the optimized W_OTSDF filter has better recognition effect than the original OTSDF filter. When the W_OTSDF filter is used to identify the distorted targets which exist at the same time as rotation, scaling and rotation scaling, the optimized W_OTSDF filter is better than the original OTSDF filter. Peak correlation energy ratio (PCE),) peak sidelobe ratio (PSR), SNR) is higher than that of OTSDF filter. At the same time, the mechanism of improving the performance of W_OTSDF filter is analyzed. (4) the equivalent experimental optical path of planar integrated 2f optical correlator is built, and the experimental results are in good agreement with the simulation analysis. The designed W_OTSDF filter is loaded on the SLM to verify the effect of the filter on the distortion target recognition. The experimental results show that for the rotating distorted target in the range of [-48 擄, 44 擄], [60], The scale distortion target of 148% and the distortion target with rotation angle [-32 擄, 36 擄] and zoom scale [722 / 134%] both have good recognition ability. Compared with the OTSDF filter, the W_OTSDF filter optimized in this paper improves the overall performance of the (PCE), peak sidelobe compared with the (PCE), peak sidelobe, and has a better recognition effect. It is helpful to improve the recognition ability of the integrated correlator system. The optimal design scheme of the filter can be widely used in the plane integrated optical correlator system. It has some research significance and application value for the development of optical pattern recognition and the practical application of optical correlator.
【學(xué)位授予單位】：深圳大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN713
本文編號：2420147
[Abstract]:Small-scale integration and excellent stable recognition performance are the two key points in the development of optical correlator. In order to compress the volume of optical correlator, we propose to use pure phase digital microlens instead of physical lens to form planar integrated 2f optical correlator. The integration of the system is improved, but the recognition rate is reduced. In order to improve the recognition performance of the system, considering the good recognition effect of the OTSDF matched filter in the distortion invariant recognition of optical correlator, this paper presents the OTSDF filter (W_OTSDF) algorithm based on wavelet transform, and optimizes its design. The optimized W_OTSDF filter is applied to the planar integrated 2f optical correlation recognition system for theoretical and experimental research. The multi-scale and band-pass filtering characteristics of wavelet transform are utilized. The correlation output peak intensity and signal-to-noise ratio (SNR).) of the system for correlation identification are improved. The feasibility of the optimal design scheme is verified by numerical simulation. The actual optical path is constructed to load the matched filter on the spatial light modulator (SLM), and the distortion invariant recognition of the target is realized. The main work of this thesis is as follows: (1) combining wavelet transform with OTSDF, the optimal design algorithm of W_OTSDF filter is proposed. Based on the theoretical analysis of wavelet transform and matched filtering, a plane integrated 2f optical correlation recognition system is designed. The algorithm of W_OTSDF filter can improve the recognition effect of distorted invariant target. (2) the simulation model of planar integrated 2f optical correlator is established. Based on the theory of planar optical transfer function and the limitation of structural parameters of planar integrated 2f optical correlator system, the structural parameters of the system are determined, and the MATLAB simulation model of the system is established. The recognition process of planar integrated 2f optical correlator is simulated by using Fresnel diffraction and phase modulation characteristics of lens. (3) the proposed W_OTSDF filter algorithm is applied to planar integrated 2f optical correlator. The simulation results show that the optimized W_OTSDF filter has better recognition effect than the original OTSDF filter. When the W_OTSDF filter is used to identify the distorted targets which exist at the same time as rotation, scaling and rotation scaling, the optimized W_OTSDF filter is better than the original OTSDF filter. Peak correlation energy ratio (PCE),) peak sidelobe ratio (PSR), SNR) is higher than that of OTSDF filter. At the same time, the mechanism of improving the performance of W_OTSDF filter is analyzed. (4) the equivalent experimental optical path of planar integrated 2f optical correlator is built, and the experimental results are in good agreement with the simulation analysis. The designed W_OTSDF filter is loaded on the SLM to verify the effect of the filter on the distortion target recognition. The experimental results show that for the rotating distorted target in the range of [-48 擄, 44 擄], [60], The scale distortion target of 148% and the distortion target with rotation angle [-32 擄, 36 擄] and zoom scale [722 / 134%] both have good recognition ability. Compared with the OTSDF filter, the W_OTSDF filter optimized in this paper improves the overall performance of the (PCE), peak sidelobe compared with the (PCE), peak sidelobe, and has a better recognition effect. It is helpful to improve the recognition ability of the integrated correlator system. The optimal design scheme of the filter can be widely used in the plane integrated optical correlator system. It has some research significance and application value for the development of optical pattern recognition and the practical application of optical correlator.
【學(xué)位授予單位】：深圳大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN713
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