Gray Code Position Detection Using Ascending Descending Subframe Sequences
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Solution Overview
Problem
Existing position detection methods for moving objects at high speeds, such as in automatic vehicle operation and interactive entertainment, require multiple subframe time periods and expensive high-speed imaging and processing devices, making them inefficient and costly.
Innovation Solution
A position detection system that projects gray code patterns with ascending and descending gray code values, each corresponding to specific subframes, allowing for faster and more cost-effective detection by dividing frames into subframes and using a controller to estimate object position based on captured images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple subframe time periods are used for projecting gray codes to measure three-dimensional form, then measurement precision is improved, but detection speed deteriorates and device cost increases
Solution Approach 1:
The frame is divided into multiple subframes, and gray code patterns are projected in ascending and descending order across these subframes. This segmentation allows the system to capture position information more efficiently, reducing the total measurement time while maintaining precision through the structured sequence of projections.
Solution Approach 2:
The gray code patterns are projected in a periodic sequence of ascending and descending orders across subframes. This periodic action enables the system to complete multiple measurement cycles within a single frame period, thereby improving detection speed without sacrificing measurement precision.
2Speed
If high-speed imaging and processing devices are used to detect moving targets, then detection speed is improved, but device cost increases
Solution Approach 1:
The system dynamically adjusts the projection sequence of gray code patterns based on the motion characteristics of the target. By optimizing the projection timing and sequence, the system achieves high-speed detection capabilities without requiring expensive high-speed imaging devices, as the method adapts to capture moving targets effectively within standard frame rates.
3Measurement precision
If multiple gray code patterns are projected and imaged, then position measurement precision is improved, but loss of time increases
Solution Approach 1:
The system performs preliminary actions by projecting gray code patterns in a predetermined ascending and descending sequence across subframes before the actual measurement is complete. This allows the imaging device to capture multiple patterns within a single frame period, reducing the total measurement time while maintaining precision through the pre-planned projection sequence.
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
Enables the detection of moving objects at higher speeds and lower costs compared to prior arts, with the ability to detect objects with varying depths using optimized gray code pattern arrangements that minimize the number of subframes required.
Implementation Method 1
a measurement target is irradiated with light from a lighting projector, and reflected light is measured
Implementation Method 2
an imaging device configured to generate a captured image by, for each of the plurality of subframes, imaging the object on which the plurality of gray code patterns are projected
Data Source
AI summary
A position detection system detects a position of an object by using a plurality of frames, each of the plurality of frames being divided into a plurality of subframes. The position detection system includes: a projector configured to project a plurality of gray code patterns having different gray code values in an order of ascending and then descending or descending and then ascending of the different gray code values, each of the plurality of gray code patterns corresponding to a corresponding one of the plurality of subframes, each of the different gray code values being a power of two; an imaging device configured to generate a captured image by, for each of the plurality of subframes, imaging the object on which the plurality of gray code patterns are projected; a controller configured to estimate the position of the object based on the captured image.