Electronic Instrument Lens Arrangement Calibration
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Solution Overview
Problem
Existing three-dimensional measurement apparatuses face reliability issues due to changes in the arrangement of projection and imaging lenses over time, leading to decreased reliability of external parameters.
Innovation Solution
A method and electronic instrument that store internal parameters of projection and imaging lenses, while updating external parameters based on captured image data without altering the internal parameters, using a projection section to project patterns and an imaging section to capture images, allowing for accurate three-dimensional shape measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If external parameters are updated based on captured image data, then measurement precision is improved, but device complexity increases due to additional update mechanisms
Solution Approach 1:
The system automatically updates external parameters using captured image data without requiring manual intervention or complex external calibration equipment. The measurement apparatus performs self-calibration by utilizing its own imaging capabilities to detect and correct arrangement changes of the lenses, thereby improving measurement precision while avoiding additional device complexity.
2Reliability
If internal parameters are frequently updated to maintain reliability, then reliability is improved, but loss of time increases due to unnecessary updates
Solution Approach 1:
The system dynamically determines which parameters require updating by analyzing captured image data. Internal parameters are updated only when actual changes in lens characteristics are detected, while external parameters are updated when arrangement changes are observed. This dynamic update strategy maintains reliability by updating only when necessary, avoiding time loss from unnecessary updates.
3Reliability
If both internal and external parameters are updated simultaneously, then reliability is improved, but loss of time increases due to redundant updates
Solution Approach 1:
The parameter update process is segmented into distinct pathways: internal parameters (focal length, distortion coefficients) are updated independently when lens characteristic changes are detected, while external parameters (arrangement data) are updated independently when arrangement changes are detected. This segmentation allows the system to update only the necessary parameters, maintaining reliability while avoiding time loss from redundant simultaneous updates of both parameter types.
Data Source
AI summary
A method for controlling an electronic instrument including a projection section that projects an image via a projection lens and an imaging section that performs imaging via an imaging lens includes causing a first storage to store first characteristic data representing the characteristics of the projection lens, second characteristic data representing the characteristics of the imaging lens, and arrangement data representing the arrangement of the projection lens and the imaging lens and then causing the projection section to project a pattern image on an object via the projection lens, causing the imaging section to capture an image of the pattern image on the object via the imaging lens to generate captured image data, and updating the arrangement data based on the captured image data, the first characteristic data, and the second characteristic data without updating the first characteristic data and the second characteristic data.