Projection Imaging System Without Synchronization
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Solution Overview
Problem
Commercially available projectors and cameras lack synchronization capabilities, making it difficult to accurately and rapidly capture projected pattern images without synchronizing the projection and imaging devices.
Innovation Solution
A projection imaging system that includes a projection device switching and projecting multiple pattern images, an imaging device generating image data, and a measurement device that discriminates between key and blended frames using a space coding method, allowing for accurate and rapid image capture without synchronization between the devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the projection time of each pattern image is sufficiently long to allow accurate image capture, then measurement accuracy is improved, but measurement time increases
Solution Approach 1:
The system projects multiple pattern images in a periodic sequence (first pattern image, second pattern image, third pattern image) and captures images at specific periodic intervals (first imaging frame, second imaging frame, third imaging frame). By selecting specific frames (key frames) from this periodic sequence, the system achieves accurate measurement without requiring excessively long projection times for each individual pattern image.
Solution Approach 2:
The system performs preliminary discrimination to identify which imaging frames are key frames containing valid measurement data. By pre-identifying key frames based on projection timing information, the system avoids processing blended frames and directly uses the discriminated key frame data for measurement, thereby reducing overall measurement time while maintaining accuracy.
2Measurement precision
If synchronization signals are used to coordinate projection and imaging devices, then image capture accuracy is improved, but device complexity increases
Solution Approach 1:
The projection device generates its own projection timing information internally and uses this information to determine which imaging frames are key frames. The system does not require external synchronization signals from separate machines; instead, it self-services by using its own projection timing data to identify valid measurement frames, thereby eliminating the need for complex synchronization hardware.
Solution Approach 2:
The system uses projection timing information as an intermediary to coordinate between the projection device and imaging device. Rather than requiring direct synchronization signals between devices, the projection timing information serves as a mediator that allows the measurement device to identify key frames without complex inter-device synchronization mechanisms.
3Measurement precision
If multiple pattern images are projected and captured, then measurement precision is improved, but processing complexity increases
Solution Approach 1:
The system extracts only the necessary key frames from the sequence of multiple imaging frames by discriminating based on projection timing information. Instead of processing all captured images, the system takes out and uses only the key frames that contain valid measurement data, thereby reducing processing complexity while maintaining measurement precision.
Solution Approach 2:
The measurement process is segmented into distinct stages: projection of multiple pattern images, capture of multiple imaging frames, discrimination to identify key frames, and measurement using only key frame data. This segmentation allows the system to handle multiple images efficiently by processing them in discrete, manageable steps rather than as a monolithic complex process.
Data Source
AI summary
Projection device switches and projects a plurality of types of pattern images in a unit of projection frame. Imaging device images object to which the pattern image is projected and generates image data. Measurement device discriminates whether each imaging frame is a key frame of the image data obtained by capturing one of the pattern images or a blended frame of the image data obtained by capturing a plurality of the pattern images switched during an exposure period of one frame, and performs measurement based on a space coding method by using at least the image data of the key frame.