| 摘要: | 本論文主要是討論如何製作出能以一般點光源重建可環繞觀賞的影像黑白化之圓盤型複合全像,並且能配合不同的白光光源調整影像黑白化的程度。
在此論文中為了觀賞到影像黑白化,採用了擴展觀賞視窗的方式,使不同波長形成的觀賞視窗能因為擴展後能有所重疊,形成可以觀賞到影像黑白化的觀賞視窗。為了達到目標,在製作全像片的過程中使用了母、子片的翻拍技術,在製作母片的物光系統中加入了毛玻璃以達到擴展觀賞視窗的目的,而以此母片翻拍製作而成的子片即能完整地重建出由毛玻璃擴展的觀賞視窗。在製作子片時,利用部分重建母片的方式重建出部分的觀賞視窗,並能以條紋可見度、曝光能量控制部分觀賞視窗之繞射效率,以此達到控制在影像黑白化的觀賞視窗上所接收到的不同波長繞射光的繞射效率,藉由此方式調整紅、綠、藍三種顏色的光強至適當的比例混合成白光。
利用上述提到母、子片的拍攝方式,完成擴展觀賞視窗的同時也製作出了影像黑白化的觀賞視窗,並且由於能控制紅、綠、藍光波長的繞射效率,即使使用了不同的重建光源都能藉由調整子片的拍攝過程使最後觀賞的影像顏色接近白色,產生影像黑白化的效果。;In this study, we discuss how to create a 360-degree viewable achromatic image disk- type holographic stereogram, and the achromatic effect can be controlled to correspond any reconstruction white light.
To produce an achromatic effect, we will extend the viewing window. Each wavelength has its viewing window, and due to the extended viewing window, there will have an overlapping range. In the overlapping range we can observe achromatic image. In the experiment, we will use two-step holographic process to achieve our purpose. In the first step, we will set a diffuser in the optic system to produce master hologram. Due to diffuser’s characteristic, a convergent point will be extend to a convergent line, and achieve the purpose of extend the viewing window. In the second step, different from the past, we will reconstruct part of master hologram to reconstruct part of the extended viewing window. The diffraction efficiency of each partial extended viewing window can be controlled by fringe visibility and exposure energy. As the result, we can control the intensity of red, green, blue diffraction light to make the final image’s color is very close to white.
Use the two-step holographic process, we can achieve the purpose of extend the viewing window, and produce the viewing window which can observe achromatic image. And due to the diffraction efficiency of red, green, blue wavelength can be controlled, even if we use different reconstruction white light, we can still control the color mixing to make achromatic effect obvious. |
