Digital recording and numerical reconstruction of holograms. Here we describe a new method for numerically reconstructing an object with variable viewing angles. The block letter f is the sample and has an intensity. A computer generated hologram or a cgh is a computed interference pattern of such. How can i find a digital hologram to test my reconstruction program. I just uploaded matlab code for reconstruction offaxis hologram, also available. Analog and digital holography with matlab spie digital library. The big bright circle in the middle of the hologram is a direct laser light, the actual. This matlab code allows simulation and iterative twin image free reconstruction of an inline inline hologram recorded with plane waves. Although this approach is a general approach, the proposed toolbox is limited to 3d reconstruction of in line digital holograms of spherical microobjects, typically droplets or bubbles. This paper presents a computationally efficient technique to reconstruct holographic lensfree images based on sparsity, which improves image quality over existing techniques, allows for the possibility of reconstructing images over a 3d volume of focaldepths simultaneously from a single recorded hologram, provides a robust estimate of the.
Suppression of dc term in fresnel digital holography by sequence subtraction of holograms jongchol kang, cholsu kim, songjin im department of physics, kim il sung university, ryongnam dong, taesong district, pyongyang, d p r korea. In morphological reconstruction, the peaks in the marker image spread out, or dilate. Highly recommended, and better than the well known book by schnars and juepner. Citation for this codealgorithm or any of its parts. Direct recording of holograms by a ccd target and numerical reconstruction u. I will use this book to teach a graduate course in introduction to digital holography. The reconstruction of the object field encoded within the hologram is based on the principle of light diffraction. If the holographic plate is illuminated after its development using the same reference wave used in the recording process, the light will diffract into three orders of diffraction if the diffraction network is sinusoidal. I tried reconstructing an image from its magnitude and phase components, but all i get is a black screen output. The reconstruction of object image from the computer generated hologram. Resolution enhancement in digital holography by self.
Zulqarnain sheikh on 2 feb 2018 i have to write a matlab code for my experiments which could generate a digital hologram. But did you expect that i already had a microparticle in hologram application ready to turn over to you. Presentation of the workflow to create a textured mesh from still images in meshroom. Select a web site mathworks makers of matlab and simulink. Holoreco a commandline tool for numerical reconstruction of digital holograms formerly known as holoplay. Can anyone provide a way to reconstruct the image of the. Corresponding reconstructions were verified by matlab for computer simulation. The aim of this study was to develop a faster, more efficient algorithm for digital hologram reconstruction. Note that if you choose the generic matlab host computer target platform, imreconstruct generates code that uses a precompiled, platformspecific shared library. Examples of digital hologram reconstruction programs digital holography wiley online l. Can anyone provide a matlab code for digital holography. This film examines the process of holography, types of holograms, and the uses of the hologram for artistic and scientific purposes, as demonstrated by tung h.
In this document, we introduce a matlab toolbox dedicated to inverse problems approach for digital hologram reconstruction. Inline hologram reconstruction with sparsity constraints lo c denis,1. The hologram in figure 22 was used to illustrate reconstruction by convolution. We propose on this web page a matlab toolbox dedicated to inverse problems approach for digital hologram reconstruction. Use of a shared library preserves performance optimizations but limits the target platforms for which code can be generated. These reconstruction techniques form the basis for common imaging modalities such as ct, mri, and pet, and they are useful in medicine, biology, earth science, archaeology, materials science, and nondestructive testing. Osa direct recording of holograms by a ccd target and. Matlab implementation of a 3d reconstruction algorithm. Development of a parallel fast fourier transformbased. Digitalhologram the digital hologram for matlab code. Performing morphological reconstruction, using the eroded image as the marker and the original image as the mask, is called opening by reconstruction. Then the use of more sophisticated devices capable of recording computer generated grey scale images was suggested for recording computer generated holograms and computer generated holograms that can reconstruction good quality grey scale images were produced 3,4. Analog and digital holography with matlab 2015 nehmetallah.
Image reconstruction toolbox for matlab and octave and freemat je rey a. Image reconstruction techniques are used to create 2d and 3d images from sets of 1d projections. This is a phenomenal textbook into digital holography. Digital holography became feasible since charged coupled devices ccds with suitable numbers and sizes of pixels and computers with sufficient speed became available. Can anyone provide a way to reconstruct the image of the object from its digital hologram captured in in line digital holography. The optical reconstruction of a computer generated hologram created by a program from my bachelors thesis.
Another way to get holograms is to get highresolution pdf of published articles. Optimization of the reconstruction parameters in computer generated holograms 27 2. A matlab program for 2d particle tracking or 3d dhm based tracking. For a fair comparison, the reconstruction parameters for both spatial. The reconstruction of the hologram relates the position of the arrows to their relative time since excitation. I have to write a matlab code for my project which detects and measures the microparticles in the holographic image. The sampling pitch of the reconstructed field is the same as that for the sensor. There exist several methods for hologram reconstruction. Do you have other uses for morphological reconstruction in your own applications. Reconstruction of offaxis hologram reconstruction of offaxis hologram this matlab code performs reconstruction of offaxis hologram with phase unwrapping of the reconstructed phase distribution. Second paramecium hologram reconstruction video youtube. The algorithm is implemented on matlab or other image processing tool 2nd mar, 2015.
Digital holography and image processing methods for. Introduction to modern digital holography with matlab. In this letter, we consider inverting the hologram formation model in a bayesian framework. Meshroom is a 3d reconstruction software based on the open source photo. Inline hologram reconstruction with sparsity constraints. A real image of the object is reconstructed from the digitally sampled hologram by means of numerical methods. Alternatively, holograms can be optically recorded and numerically reconstructed. Image reconstruction toolbox for matlab and octave and. In the current paper we present a totally new algorithm also based on the twohologram technique. Fourier optics and computer generated hologram 5 in matlab, even if the size of the object is not exactly n x n it can be used for manipulation using image resize tools interpolation techniques.
It is based on numerical reconstruction of recorded interference fringe. Can anyone provide a way to reconstruct the image of the object. The resulting interference fringes are then decoded in matlab to scan. Dynamic reconstruction of 3dscenes from registered digital. Calculation processes for reconstruction are both time and memoryintensive. Holography is the only truly threedimensional imaging method available, and matlab has. Upon the proper recording, reconstruction, and viewing conditions, unlike the traditional 2d photography, the image appears to be 3d again. This matlab code performs reconstruction of offaxis hologram with phase unwrapping of the reconstructed phase distribution. Numerical reconstruction of images from digital holograms is a fundamental task in digital holography. Reconstruction of a complex object from two inline holograms. Theory let us consider the diffraction of monochromatic, unit amplitude, plane wave, normally impinging on an aperture in the input plane the hologram plane characterized by the complex transmission function. Accurate 3d reconstruction of in line digital holograms of spherical objects, typically droplets, bubbles 8 or beads is the direct target of holorec3d although the option. The matlab code is easy to follow and provided me with some new methods to augment my own hologram reconstruction code. If you have trouble with implementing it into matlab i.
Filtering effect in holographic image processing ferdous ahmed, md. Digital holography is a comparatively new observation method for micronsized particles. Iterative twinimage free reconstruction of inline hologram. Optical reconstruction of a computer generated hologram. This matlab code allows simulation and reconstruction of inline inline, gabor holograms recorded with plane waves. Fth mask fourier transform holography mask focused ion beam milling was used to pattern the au structure. We suggest the use of a sparsitypromoting prior, verified in many inline holography applications, and present a simple iterative algorithm for 3d object reconstruction under sparsity and positivity constraints. Efficient reconstruction of holographic lensfree images. The discussion in this chapter will also make clear the need for a cylindrical shaped hologram, and explain its advantages and disadvantages. Holography is the only truly threedimensional imaging method available, and. The hologram was also reconstructed using the cepstrum technique proposed in this paper.
The most important methods for reconstruction of holograms, recorded in fresnel zone, are fourier reconstruction algorithm and convolutional reconstruction algorithm 1. Reconstruction of offaxis hologram file exchange matlab central. The sampling pitch of the reconstructed field is the same as that. A hologram for the king 1 hours and 38 minutes movie 2016 a failed american sales rep looks to recoup his losses by traveling to saudi arabia and selling his companys product to a wealthy monarch. Create a hologram with matlab hi, i have been given a task to mathematically create a hologram of an object so that i can try various reconstruction procedures to obtain the objects field. This technique achieves 3d reconstruction of objects from a 2d hologramimage and reaches accuracies in the range of or smaller than the. Mozhdeh seifi, corinne fournier, loic denis to cite this.
671 735 1012 545 1285 645 980 1136 182 1319 1477 1467 343 265 1396 978 648 529 944 1014 150 917 1060 87 794 1505 1479 1461 685 445 591 667 1286 586 82 110 420 884 520