Phase Modulation Structure Calculation Method for Optical Film
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for reconstructing images from optical films require reference light conditions at the time of recording, limiting flexibility and increasing calculation time, as they need to be illuminated under the same conditions as during recording, and previous techniques to reduce calculation time restrict the angle of image reconstruction.
Innovation Solution
A calculation method that calculates phases for unit blocks in a representative area and copies these phases to other areas through rotation and inversion, allowing reconstruction without reference light conditions, reducing calculation time by calculating phases only for partially or entirely included unit blocks in the representative area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the calculation method uses reference light conditions for recording, then the image can be reconstructed with the same conditions as during recording, but the flexibility is limited and calculation time is increased
Solution Approach 1:
The patent extracts and eliminates the reference light condition requirement from the hologram recording process. By calculating phases based solely on object light and using a mathematical transformation (Fourier transform) to separate reference and object light components, the system can reconstruct images without requiring the original reference light conditions, thereby achieving flexibility while maintaining reconstruction accuracy
Solution Approach 2:
The patent creates a mathematical copy of the hologram data that contains both object and reference light information encoded together. This copied hologram can be reconstructed under different illumination conditions by processing the copied data through the same mathematical transformation, enabling adaptability without sacrificing reconstruction reliability
2Loss of time
If the calculation method divides the original image into multiple linear unit regions, then calculation time is reduced, but the angle at which the original image is reconstructed is limited
Solution Approach 1:
The patent segments the hologram calculation into two independent parts: (1) calculating phases for unit blocks in the original image, and (2) copying these phases to corresponding unit blocks in the transformed image. This segmentation allows efficient calculation while preserving the full angular information, as the phase copying maintains the spatial frequency relationships needed for wide-angle reconstruction
Solution Approach 2:
The patent introduces a mathematical dimension (Fourier transform space) to separate the calculation process from the physical reconstruction process. By performing calculations in the frequency domain and then transforming back to the spatial domain, the system achieves both computational efficiency and full angular coverage, as the transformation preserves all spatial frequency information
3Loss of information
If amplitude of light is recorded on the optical film, then the interference fringe information is captured, but the intensity of light is reduced when reconstructed
Solution Approach 1:
The patent replaces the mechanical/optical recording of amplitude information with a mathematical phase recording system. Instead of recording light amplitude directly on the optical film, the system calculates and records phase information through mathematical operations (Fourier transform and phase extraction), thereby preserving light intensity while capturing interference fringe information
Solution Approach 2:
The patent changes the recording parameter from light amplitude to light phase. By recording phase information instead of amplitude, the system maintains the full intensity of light during reconstruction, as phase modulation does not attenuate the light wave, while still capturing the interference fringe patterns through the mathematical relationship between phases
Data Source
AI summary
A phase modulation structure includes a recording surface including phase angle recording regions in a plurality of calculated element regions corresponding to reconstruction points of an image on a one-to-one basis, each phase angle recording region being formed of a plurality of unit blocks in each of which a phase angle is recorded, the phase angle being calculated based on a phase that is a sum of a plurality of phases of light from the corresponding reconstruction points; and a representative area that is one of divisions of the calculated element region, the representative area being obtained by radially dividing the calculated element region centered on a point on the calculated element region, the point being obtained by extending a normal line from the corresponding reconstruction point to the calculated element region on the recording surface.