Computer generated fresnel hologram fabrication for true life scene 3D display
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Chen, Bing-Chu
In this paper we use model-based 3D reconstruction to get the real life 3D scene information through the traditional photos. A novel approach called modified integral imaging is present. The 3D data is encoded to 2D data by the algorithm of integral imaging. The coded 2D information is stored on the holographic plate by matrix holographic lithography. The reconstruction scenes exhibit large depth-of-field and have wide viewing-angle. It’s easy to duplicate the 3D scene using regular equipment. There are many applications such as holographic packaging and 3D logo using this technology.
 Good afternoon everyone. I am BC from Guangzhou. My supervisor is He Zhou Wang from Shunyesen University. My talk is computer-generated fresh air hologram fabrication for true life things three-dimensional display. Just now someone asked a question about the hollow TV done, finished by Dr. Fan. Whether it is a hologram, my talk will talk about this question. Part one is the background. Nowadays a lot of interested has focused on three-dimensional displays, a lot of techniques, all techniques such as lenticular lens, parallelized barrier, and as we all think that holography is the perfect technique for three-dimensional display. But however, it is one question to capture true life three-dimensional thing for traditional optical setup. The main reason is the shortage of the coherent lens from laser. In this paper, we propose a technique we call the computer-generated fresh air hologram CGFH for displaying true life thing. Firstly, we do some theoretical job. So we set up, this is the three-dimensional thing. At this plan, we set up a special line modulator. At this plan, we set a holography plate to record every perspective of the three-dimensional thing. The distance by the distance between the special line modulator and the holography plant. We set up three coordinate systems to describe the position. For this three-dimensional object, we set up a three-dimensional coordinate system, the XYZ. At this special line modulator plan, we set up XP, YP, two-dimensional coordinate system to describe the image. At this holography plate, we set up UV for this pinhole mask. When UV describes the position of pinhole mask, this pinhole mask adhere to holography plate. According to Ray-Chasing Projection Geometric, we can get these easy equations. We use these equations to do algorithm in computer. Next, we suppose each objective point is an infinite decimal of emitter. Then the projection image that corresponds to this infinite decimal object point could be written as the following equation. Delta is the direct pulse function. All XYZ is the object point located at XYZ. All XYZ stands represent the intensity of this point. This is the equations calculated by this. Delta X, delta Y, delta Z stands by the infinite decimal object point. P, a single source point, XP, YP is the point at the position of XP, YP represents the intensity of the projection image. Then we record the holograph for this infinite decimal object point. We can get this equation, an introduction. This is the key transformation. To this equation, we find out that there is a term, d over EZ. We get a little d over EZ using this approximated condition that is d approximated to EZ. We can get the HUV single source point at the point of UV. Then the holograph for the whole tile object scene is written as the follow. This is very familiar to us. This is the Fresnel equations. It is very clear to say that it is equivalent to traditional Fresnel hologram that we did computer-generated Fresnel hologram. It is equivalent to the traditional Fresnel hologram of 3D object. That is why the computer-generated Fresnel hologram can record the depth of the 3D scene. We get this theoretical and analytical result that we say it is equivalent to Fresnel hologram. We did some experiments to verify our theory. We how to fabricate a computer-generated Fresnel hologram. First, we get 3D data of the 3D scenes, such as using laser scanner or something else. Then we encode 3D data, transform 3D data to the ray-chasing projection imagery. Then fabricate computer-generated Fresnel hologram by mesh-stocked holography-lister-graphy. This is our optical setup. The laser, bioparm solistee laser, single frequency, goes to the beam splitter and split two beams and goes to the lens and the spatial line modulator. This is the diffuser. At this, we get a pinhole mask adhered to the holography plate. The pinhole mask is mounted on the translation stage, which is motorized, and to control the position of the pinhole to match the ray-chasing projection image. In step B is the reconstruction optical setup. This shows different perspectives. We get different projection images. Actually, we got 100 times 100 perspective. When we get the computer-generated Fresnel hologram, this is the construction image. We focus with this trace, this trace, we got three traces of our three-dimensional scene. This king is the franchise, and the bai shi and the pong is at a bad position. We get the reconstruction. When we focus at the plan of these two traces, we can get these two traces clear and the franchise blurring. When we focus using a camera, focus at the plan of this trace, the king trace, and the two backchase is blurring. So, on focus, clear. Our focus blurring. We get the three-dimensional picture. The three-dimensional picture, computer-generated Fresnel hologram can recall the depth of the 3D scene. For true-life scene, we render the camera with the digital camera. We render using these two pictures. We render it using model-based reconstruction. We get the 3D data and we get the 3D image. We fabricate the computer-generated Fresnel hologram. This is the list construction video. There's a lot of spectra. The experiment result is not very good. The condition of the experiment is not very good. This is the perspective image made in software. We always done this in theory. It is proven that computer-generated Fresnel hologram is equivalent to the traditional Fresnel hologram. We set up an experiment to fabricate CGFH and the reconstruction shows a good depth of field. This way, we can fabricate CGFH to display true-life 3D scene. I want to thank our supervisor. This is our group website. I want to mention that this set up, Stephen Smith has done this very similar job several years ago. Thank you for your attention. Thank you. Questions or comments? Thank you very much. I'm afraid how much the viewing angles, the projection views should you use? We didn't have exactly number, but about 15 degrees. What kind of hologram do you use? What kind of hologram? Transmission Fresnel hologram. Amplitude hologram or face hologram? Any more? Okay. Thank you.
 Good afternoon everyone. I am BC from Guangzhou. My supervisor is He Zhou Wang from  Shunyesen University. My talk is computer-generated fresh air hologram  fabrication for true life things three-dimensional display.  Just now someone asked a question about the hollow TV done, finished by Dr. Fan.  Whether it is a hologram, my talk will talk about this question.  Part one is the background. Nowadays a lot of interested has focused on three-dimensional  displays, a lot of techniques, all techniques such as lenticular lens,  parallelized barrier, and as we all think that holography is the perfect  technique for three-dimensional display. But however, it is one question to capture  true life three-dimensional thing for traditional optical setup. The main reason  is the shortage of the coherent lens from laser. In this paper, we propose a  technique we call the computer-generated fresh air hologram CGFH for displaying  true life thing. Firstly, we do some theoretical job. So we set up, this is  the three-dimensional thing. At this plan, we set up a special line modulator.  At this plan, we set a holography plate to record every perspective of the  three-dimensional thing. The distance by the distance between the special line  modulator and the holography plant. We set up three coordinate systems to  describe the position. For this three-dimensional object, we set up a  three-dimensional coordinate system, the XYZ. At this special line modulator  plan, we set up XP, YP, two-dimensional coordinate system to describe the image.  At this holography plate, we set up UV for this pinhole mask. When UV  describes the position of pinhole mask, this pinhole mask adhere to holography  plate. According to Ray-Chasing Projection Geometric, we can get these  easy equations. We use these equations to do algorithm in computer. Next, we  suppose each objective point is an infinite decimal of emitter. Then the  projection image that corresponds to this infinite decimal object point could be  written as the following equation. Delta is the direct pulse function. All  XYZ is the object point located at XYZ. All XYZ stands represent the intensity  of this point. This is the equations calculated by this. Delta X, delta Y,  delta Z stands by the infinite decimal object point. P, a single source point,  XP, YP is the point at the position of XP, YP represents the intensity of the  projection image. Then we record the holograph for this infinite decimal  object point. We can get this equation, an introduction. This is the key  transformation. To this equation, we find out that there is a term, d over  EZ. We get a little d over EZ using this approximated condition that is d  approximated to EZ. We can get the HUV single source point at the point of  UV. Then the holograph for the whole tile object scene is written as the  follow. This is very familiar to us. This is the Fresnel equations. It is very  clear to say that it is equivalent to traditional Fresnel hologram that we did  computer-generated Fresnel hologram. It is equivalent to the traditional  Fresnel hologram of 3D object. That is why the computer-generated Fresnel  hologram can record the depth of the 3D scene. We get this theoretical and  analytical result that we say it is equivalent to Fresnel hologram. We did  some experiments to verify our theory. We how to fabricate a computer-generated  Fresnel hologram. First, we get 3D data of the 3D scenes, such as using laser  scanner or something else. Then we encode 3D data, transform 3D data to the  ray-chasing projection imagery. Then fabricate computer-generated Fresnel  hologram by mesh-stocked holography-lister-graphy. This is our optical  setup. The laser, bioparm solistee laser, single frequency, goes to the beam  splitter and split two beams and goes to the lens and the spatial line  modulator. This is the diffuser. At this, we get a pinhole mask adhered to the  holography plate. The pinhole mask is mounted on the translation stage, which  is motorized, and to control the position of the pinhole to match the  ray-chasing projection image. In step B is the reconstruction optical setup.  This shows different perspectives. We get different projection images.  Actually, we got 100 times 100 perspective. When we get the computer-generated  Fresnel hologram, this is the construction image.  We focus with this trace, this trace, we got three traces of our three-dimensional  scene. This king is the franchise, and the bai shi and the pong is at a bad  position. We get the reconstruction. When we focus at the plan of these two  traces, we can get these two traces clear and the franchise blurring. When we  focus using a camera, focus at the plan of this trace, the king trace, and the  two backchase is blurring. So, on focus, clear. Our focus blurring. We  get the three-dimensional picture. The three-dimensional picture, computer-generated  Fresnel hologram can recall the depth of the 3D scene. For true-life scene, we  render the camera with the digital camera. We render using these two pictures.  We render it using model-based reconstruction. We get the 3D data and  we get the 3D image. We fabricate the computer-generated Fresnel hologram.  This is the list construction video.  There's a lot of spectra. The experiment result is not very good. The  condition of the experiment is not very good. This is the perspective image  made in software. We always done this in theory. It is proven that computer-generated  Fresnel hologram is equivalent to the traditional Fresnel hologram. We set up  an experiment to fabricate CGFH and the reconstruction shows a good depth of  field. This way, we can fabricate CGFH to display true-life 3D scene. I want  to thank our supervisor. This is our group website. I want to mention that  this set up, Stephen Smith has done this very similar job several years ago.  Thank you for your attention. Thank you.  Questions or comments?  Thank you very much. I'm afraid how much the viewing angles, the projection views  should you use? We didn't have exactly number, but about 15 degrees.  What kind of hologram do you use?  What kind of hologram?  Transmission Fresnel hologram.  Amplitude hologram or face hologram?  Any more? Okay. Thank you.
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