Diffractive Optical Element Speckle Density Control
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Solution Overview
Problem
Existing speckle projectors in 3D recognition systems face a significant decrease in speckle density at the edge of the field of view due to distortion, leading to reduced recognition precision.
Innovation Solution
A method involving a beam-splitting point array divided into first and second arrays, with extension replication applied to the second array based on minimum or average adjacent point spacings, to increase speckle density in specific regions without affecting central regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a diffractive beam splitter is used for array replication of the light source, then the speckle array is projected onto the viewing screen, but the speckle density at the edge of the field of view decreases significantly compared with the center due to distortion effect
Solution Approach 1:
The patent applies local quality by dividing the beam-splitting point array into a first beam-splitting point array for the central region and a second beam-splitting point array for the edge region. The second array undergoes extension replication to increase speckle density specifically at the edge of the field of view, while maintaining the original density at the center. This localized modification resolves the contradiction by making speckle density uniform across different regions, thereby improving both manufacturing precision and 3D recognition precision.
2Quantity of substance
If extension replication is performed on the second beam-splitting point array, then the speckle density in the second speckle region increases, but the complexity of the beam-splitting point array design increases
Solution Approach 1:
The patent segments the beam-splitting point array into two distinct parts: a first beam-splitting point array for the central region and a second beam-splitting point array for the edge region. This segmentation allows independent processing of each region, where extension replication is applied only to the second array. By dividing the problem, the patent increases speckle density where needed while keeping the overall design complexity manageable through modular structure.
3Adaptability or versatility
If the beam-splitting point array is divided into first and second arrays, then the speckle density can be independently controlled in different regions, but the device structure becomes more complex
Solution Approach 1:
The patent implements local quality control by creating separate beam-splitting point arrays for different regions. The first array handles the central region with original speckle density, while the second array handles the edge region with increased density through extension replication. This localized control strategy provides adaptability for region-specific optimization while managing structural complexity through clear functional separation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method effectively increases speckle density at the edge of the field of view, enhancing recognition precision while maintaining density in central regions.
Implementation Method 1
a beam-splitting point array, where the beam-splitting point array is used for performing array replication and projection on a multi-point light source to form a speckle array
Data Source
AI summary
A method for increasing speckle spot density, comprising: acquiring light splitting dot array, which is used for performing array copying on multi-point light source and projection to form speckle spot array; acquiring minimum neighboring point spacing or average value of neighboring point spacing of all or part of light-emitting points in the multi-point light source; dividing light splitting dot array into first light splitting dot array and second light splitting dot array, speckle spot array formed by projection by first light splitting dot array being located in first speckle spot area, and speckle spot array formed by projection by second light splitting dot array being located in second speckle spot area; and performing expansive copying on each light splitting dot in second light splitting dot array so as to form third light splitting dot array.