Conversion Parameter Calculation for 3D Displacement
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Solution Overview
Problem
Existing image capturing devices require additional distance measurement devices and prior knowledge of object lengths to accurately measure displacement, making it difficult to readily convert pixel displacement into actual displacement values.
Innovation Solution
A method and device that calculate a conversion parameter using image data from an image capturing device with attached markers, estimating the device's position and calculating distance to convert pixel displacement into actual displacement, without needing separate distance measurement devices or prior length information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a distance measurement device is added to the image capturing device, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent extracts the distance measurement function from a separate distance measurement device and integrates it into the image capturing device by using the image data itself to calculate distance. The conversion parameter calculation unit computes distance information from image data captured by the image capturing device, eliminating the need for an external distance measurement device while maintaining measurement precision.
Solution Approach 2:
The image capturing device is given multiple functions: it not only captures images for displacement measurement but also calculates distance information from the captured image data. The conversion parameter calculation unit enables the image capturing device to perform both imaging and distance measurement functions, reducing overall system complexity.
2Manufacturing precision
If prior length information of the object is required, then manufacturing precision is improved, but ease of operation deteriorates
Solution Approach 1:
The system uses itself to provide the required information. The conversion parameter calculation unit calculates distance information and conversion parameters using only the image data captured by the image capturing device. The system does not require external input of object length information, as it autonomously computes all necessary parameters from the image data alone.
3Device complexity
If conversion parameter calculation uses only image data without distance measurement, then device complexity decreases, but measurement precision deteriorates
Solution Approach 1:
The patent transitions from two-dimensional image pixel displacement to three-dimensional actual displacement by calculating distance information from the image data. The conversion parameter calculation unit uses the captured image data to compute distance, then applies this distance information to convert pixel displacement in the image plane to actual three-dimensional displacement, maintaining precision without additional hardware.
Data Source
AI summary
A conversion parameter calculation method includes: obtaining, from an image capturing device, image data obtained by the image capturing device capturing an image of an object having attached thereto a marker with which specific coordinates are detectable; obtaining displacement direction information indicating a direction of a displacement of the object, the direction crossing an image capturing surface of the image capturing device; detecting specific coordinates, based on the marker included in the image data; estimating a position of the image capturing device, based on a result of the detection; calculating distance data indicating a distance from the image capturing device to the object, based on the position of the image capturing device; and calculating, using the distance data and the displacement direction information, a conversion parameter for converting a pixel displacement amount of the object into an actual displacement amount.