Phase-Inverted Projection Pattern for Corresponding-Point Detection Accuracy
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Solution Overview
Problem
The phase-shift method for corresponding-point detection in information processing devices is prone to errors due to asynchronous noise and interreflection issues, particularly when dealing with complex surfaces, which degrades detection accuracy.
Innovation Solution
The use of a projection control unit that projects a second pattern with a first pattern featuring sinusoidal variations in both directions, inverted in phase, to enhance corresponding-point detection accuracy by reducing noise and interreflection effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the phase-shift method is used for corresponding-point detection, then the detection method can be implemented, but asynchronous noise causes incorrect phase detection and degrades accuracy
Solution Approach 1:
The patent applies periodic action by projecting patterns with periodic phase inversions in both horizontal and vertical directions. The pattern includes regions where the phase is inverted relative to adjacent regions, creating a periodic structure that helps distinguish true corresponding points from noise-affected detections. This periodic modulation allows the system to identify and eliminate erroneous detections caused by asynchronous noise.
2Measurement precision
If the phase-shift method is used for corresponding-point detection, then the detection process can proceed, but interreflection on multi-surface projected surfaces causes errors in detection
Solution Approach 1:
The patent uses periodic phase inversion patterns where alternating regions have inverted phases. When interreflection occurs from adjacent surfaces, the periodic structure allows the detection system to identify inconsistent phase relationships that indicate reflected light rather than direct light. This enables the system to filter out erroneous corresponding points caused by interreflection while maintaining accurate detection on the primary surface.
Data Source
AI summary
The present technology relates to an information processing device and an information processing method, capable of inhibiting corresponding-point detection accuracy from degrading. The information processing device according to the present technology, allows a projecting unit to project a second pattern including a first pattern including repetition in first cycles in a first direction, inverted in phase in second cycles in a second direction orthogonal to the first direction, in order to acquire corresponding relationship in pixel between the projecting unit and a capturing unit. The present technology can be applied to an electronic instrument including the function of a projector or the functions of both a projector and a camera, and a computer that controls the functions.