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1.
单通道光学相关实现击中与否运算   总被引:1,自引:1,他引:0  
景红梅  程惠全 《光学学报》1998,18(10):317-1325
给出了一种单通道光学相关实现击中与否运算的算法和光学装置,此法基于形态学中的腐蚀运算和光学相关的关系及阈值操作,在非相干光学相关器中,将前景结构核元素编码为1,背景结构核元素编码为a(a满足一定条件),只需用原图像与前景和背景结构进行相关,然后对相关结果取阈值的K(前景结构核元素的像素数)即可得到击中与否运算,击中与否运算可以光学并行一步实现。  相似文献   

2.
排序击中击不中变换及其光学实现   总被引:3,自引:0,他引:3  
程惠全  刘立人  景红梅  汪澄 《光学学报》1999,19(9):251-1256
基于对形态学灰度排序击中击不中变换的取阈方法的研究,提出了单通道排序击中击不中变换,探讨了相应的光学实现,与码编码击不击不中变换相比,由于仅仅使用了原始图像因而更于光学实现,扩大了以击中击不中变换为基础的光学数学形态学处理系统的容噪性和自理能力。  相似文献   

3.
提出了一种基于交叉克尔非线性效应产生四光子偏振态簇态的方案,与其他产生四光子簇态的方案比较,该方案引入宇称门的思想和用到基于零差探测的非破坏测量方法,使得该方案在实验上更易于操作及实现.  相似文献   

4.
联合击中击不中变换相关器   总被引:9,自引:3,他引:6  
成罡  袁石夫 《光学学报》1997,17(3):18-324
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   

5.
光学并行实现模糊逻辑图像处理   总被引:2,自引:2,他引:0  
景红梅  刘立人 《光学学报》2001,21(11):347-1352
提出和验证一种基于偏振-空间编码方案和多重成像技术的光学方法来实现模糊逻辑图像处理,系统中,模糊变量和它们的补被编码为空间正交分布的两个偏振状态。通过对透镜阵列状态的编程,可以实现两个模糊图像间的模糊逻辑操作。本系统中,两个输入图像被偏振编码为8个编码图像作为输入图像,系统是空不变系统,不需要取阈装置和解码过程,通过引进取阈装置,可以在一层系统中实现两个图像间更为复杂的模糊逻辑操作,并给出了实验结果。  相似文献   

6.
提出一种基于无监督学习的偏振图像去噪方法,该方法打破了监督学习下深度学习需要严格配对图像的限制,使用非配对偏振图像训练一个偏振特化的循环生成对抗网络。该网络通过所提出的基于偏振信息的损失函数统计学习噪声图像和清晰图像的映射。实验结果表明,该网络可以有效地抑制室内外不同环境下偏振图像的噪声,同时能较好地恢复线性偏振度和偏振角。所提方法对复杂噪声环境下的偏振成像应用具有重要意义。  相似文献   

7.
兴丰  刘立人 《光学学报》1995,15(8):072-1076
在灰值数学形态学的阴影算法的基础上,提出了采用表面点集代替阴影来代表灰值结构核的改进算法,大大降低了二值邻域互连的数量。光学实现采用一个光学非相干相关器与阈值器件结合的二值数学形态学系统,并设计了一种数字空间编码技术使这二维系统能实现算法要求的有限三维操作。  相似文献   

8.
用电子俘获材料实现实时图像微分   总被引:4,自引:1,他引:3  
阮昊  陈述春 《光学学报》1997,17(7):10-914
根据数学形态学的基本思想,采用离焦的卷积光学系统,利用电子俘获材料的饱和特性和图像减法功能实现图像微分,这一方案具有清晰度高、实时性,全并行性的优点,取阀和减法运算都用一片电子俘获薄膜来实现。  相似文献   

9.
三通道偏振成像系统及系统误差校正方法   总被引:2,自引:0,他引:2  
为了解决现有偏振成像系统难以满足目标检测和跟踪等实时图像处理领域的要求,提出一种实时三通道偏振成像系统,并对该系统存在的视场差异和非一致性误差提出了校正方法.该系统采用三个独立通道采集0°、60°和120°方向上的偏振图像,针对三个独立通道之间存在的视场差异提出了采用尺度不变特征转换配准法进行校正的方法;同时针对三个独立通道之间的灰度响应非一致性现象,根据积分球的退偏特性和探测器的线性响应模型,利用积分球产生完全非偏振光对灰度响应非一致性误差进行了校正.对比实验证明:1)本文提出的三通道偏振成像系统进行校正后的成像效果能够接近单通道偏振成像系统的水平;2)该系统能够在实时采集图像的同时,克服了多通道带来的偏振图像质量下降问题,提高了实用性.  相似文献   

10.
提出一种广义互补编码方法,用于一步实现数学形态学击中击不中变换,并以非相干光相关器为光学实现硬件,利用液晶投影板作为实时空间光调制器,研制了一台光电混合目标识别处理器.实验结果表明识别率大于90%,并对带有40%噪声,50%缺损和6°以内旋转的图像甚至不同表情的人脸图像均能识别.  相似文献   

11.
Using an incoherent optical correlator, a programmable optical morphological hit-miss transform processor with large structuring element is proposed and demonstrated. The experimental results are given.  相似文献   

12.
袁石夫  张景文 《光学学报》1995,15(10):399-1403
应用形态击中周不中变换,提出了一种提高光学全息关联存储寻址准确性的方法,并给出了实验演示。  相似文献   

13.
四通道实时联合变换相关器   总被引:2,自引:0,他引:2  
张以谟  廖江红 《光学学报》1995,15(6):28-733
提出把光学波阵面分割复用器用于单通道实时光电混合联合变换相关系统实现四通道实时相关,使单通道系统扩展为具有多个独立通道的系统,使系统的容量和处理速度提高数倍,使系统的性能得以改善。给出了新系统的设计方案、工作原理和实验结果。  相似文献   

14.
可编程光学击中击不中变换及其在模式识别中的应用   总被引:1,自引:0,他引:1  
袁石夫  张学如 《光学学报》1995,15(2):40-144
提出了一种利用击中击不中变换实现具有边缘噪声的模式的形态识别方法并给出计算模拟结果。利用一个非相干光学相关器,构成了一个实时可编程光学击中击不变处理器。演示了字符识别过程并给出了实验结果。  相似文献   

15.
Triple image encryption scheme in fractional Fourier transform domains   总被引:1,自引:0,他引:1  
We proposed a triple image encryption scheme by use of fractional Fourier transform. In this algorithm, an original image is encoded in amplitude part and other two images are encoded into phase information. The key of encryption algorithm is obtained from the difference between the third image and the output phase of transform. In general case, random phase encoding technology is not required in the proposed algorithm. Moreover, all information of images is preserved in theory when image are decrypted with correct key. The optical implementation of the algorithm is presented with an electro-optical hybrid structure. Numerical simulations have demonstrated the efficiency and the security of this algorithm. Based on this scheme a multiple image algorithm is expanded and designed.  相似文献   

16.
A novel three-dimensional (3D) image encryption approach by using the computer-generated integral imaging and cellular automata transform (CAT) is proposed, in which, the two-dimensional (2D) elemental image array (EIA) digitally recorded by light rays coming from the 3D image is mapped inversely through the virtual pinhole array according to the ray-tracing theory. Next, the encrypted image is generated by using the 2D CAT scrambling transform for the 2D EIA. The reconstructed process is carried out by using the modified computational integral-imaging reconstruction (CIIR) technique; the depth-dependent plane images are reconstructed on the output plane. The reconstructed 3D image quality of the proposed scheme can be greatly improved, because the proposed encryption scheme carries out in a computer which can avoid the light diffraction caused by optical device CIIR, and solves blur problem caused by CIIR by using the pixel-averaging algorithm. Furthermore, the CAT-based encryption algorithm is an error-free encryption method; CAT as an orthogonal transformation offers considerable simplicity in the calculation of the transform coefficient, that is, it can improve the quality of the reconstructed image by reducing energy loss compared with the traditional complicated transform process. To show the effectiveness of the proposed scheme, we perform computational experiments. Experimental results show that the proposed scheme outperforms conventional encryption methods.  相似文献   

17.
The present work describes a novel mathematical scheme for the evaluation of multi-dimensional time domain integrals that arise in the calculation of resonance Raman excitation profiles and the optical absorption spectra when the electronic transitions take place between displaced, distorted, and rotated harmonic potential energy surfaces. A recipe is provided for formulating the time domain integrals in terms of a tractable summation of products involving hermite polynomials. Expressions for the special cases (displaced and/or distorted oscillators) are written in terms of mathematical special functions which are computationally easier to deal with. Relations with the so-called transform theory are discussed. Resonance Raman excitation profiles and the optical absorption spectrum for a 7-mode system are calculated as an illustration of our expressions.  相似文献   

18.
Jia Luo 《中国物理 B》2022,31(4):40302-040302
We propose a new quantum watermarking scheme based on threshold selection using informational entropy of quantum image. The core idea of this scheme is to embed information into object and background of cover image in different ways. First, a threshold method adopting the quantum informational entropy is employed to determine a threshold value. The threshold value can then be further used for segmenting the cover image to a binary image, which is an authentication key for embedding and extraction information. By a careful analysis of the quantum circuits of the scheme, that is, translating into the basic gate sequences which show the low complexity of the scheme. One of the simulation-based experimental results is entropy difference which measures the similarity of two images by calculating the difference in quantum image informational entropy between watermarked image and cover image. Furthermore, the analyses of peak signal-to-noise ratio, histogram and capacity of the scheme are also provided.  相似文献   

19.
A new optical image watermarking technique based on compressive sensing using joint Fresnel transform correlator architecture has been presented. A secret scene or image is first embedded into a host image to perform optical image watermarking by use of joint Fresnel transform correlator architecture. Then, the watermarked image is compressed to much smaller signal data using single-pixel compressive holographic imaging in optical domain. At the received terminal, the watermarked image is reconstructed well via compressive sensing theory and a specified holographic reconstruction algorithm. The preliminary numerical simulations show that it is effective and suitable for optical image security transmission in the coming absolutely optical network for the reason of the completely optical implementation and largely decreased holograms data volume.  相似文献   

20.
周阳  张红伟  钟菲  郭树旭 《物理学报》2018,67(24):244201-244201
为了有效降低传统鬼成像中相关噪声对成像质量的影响,本文提出一种基于最佳阈值的迭代降噪鬼成像.首先在迭代降噪鬼成像的基础上,采用自适应阈值迭代法,在不需要目标先验信息的前提下,找到一个逼近传统鬼成像中相关噪声的阈值,根据得到的阈值构造噪声干扰项.为了每次迭代初值更接近原始目标的透射系数,对其进行二值化,降低重构图像背景噪声对迭代性能的影响.仿真以及实验结果表明,本文提出的方法与传统方法相比,视觉效果以及峰值信噪比值有明显提高.  相似文献   

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