Metal Detector Shape Visualization via Optical Flow Tracking
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Solution Overview
Problem
Current metal detectors cannot accurately visualize the geometrical shape of buried or obscured metal targets, especially when used handheld and without controlled movement, due to limitations in positional tracking and image enhancement capabilities.
Innovation Solution
A metal detector system integrating a positional tracking unit with sensors for real-time optical flow detection, combined with an image processing and display unit, allows for the collection and visualization of metal signals as the search head moves randomly over the target, providing clear cross-sectional images and enhancing image clarity through multi-search assessments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a metal detector uses traditional detection methods with basic positional tracking, then it can detect the presence of metal targets, but it cannot accurately visualize the geometrical shape of buried or obscured metal targets
Solution Approach 1:
The patent combines multiple sensors (image sensor, distance measurement sensor, gyroscope, accelerometer, magnetometer) with the metal detector to create an integrated system. This merging of sensors allows the system to capture both metal detection data and positional/visual data simultaneously, enabling accurate shape visualization without requiring separate complex systems
Solution Approach 2:
The patent introduces an image processing algorithm as an intermediary that processes raw sensor data and reconstructs the geometrical shape of metal targets. This algorithm acts as a mediator between the physical sensors and the final visual output, transforming complex sensor readings into accurate shape representations
2Measurement precision
If the metal detector requires controlled movement for accurate imaging, then image quality improves, but ease of operation deteriorates
Solution Approach 1:
The patent employs feedback mechanisms where the system continuously monitors the detector's position and movement through sensors (gyroscope, accelerometer, optical flow detection) and automatically adjusts the imaging process. This feedback loop allows the system to maintain image accuracy even when the user moves the detector freely, eliminating the need for controlled movement
Solution Approach 2:
The system performs self-correction by automatically compensating for movement disturbances using sensor data. The integrated sensors detect positional changes and the image processing algorithm automatically adjusts to maintain accurate target shape visualization, making the system self-sufficient and easy to operate without requiring user expertise in movement control
3Ease of operation
If the metal detector is used in free state handheld operation, then ease of operation improves, but measurement precision deteriorates due to uncontrolled movements
Solution Approach 1:
The patent replaces mechanical control requirements with sensor-based detection and computational correction. Instead of requiring mechanically controlled movement for accuracy, the system uses optical flow detection, gyroscopes, and accelerometers to track movement and algorithmically correct for it, enabling accurate measurements during free handheld operation
Solution Approach 2:
The patent adds temporal and computational dimensions to the detection process. By incorporating time-based sensor data (optical flow, acceleration over time) and using image processing algorithms to reconstruct shapes from multiple measurements taken during free movement, the system transforms uncontrolled 3D spatial movement into accurate 3D shape data through computational processing
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 user to visualize the geometrical shape of buried metal targets with distinguishable clarity, allowing for accurate detection and classification without the need for controlled movement or re-scanning, and adjusts parameters like sensitivity and soil conditions dynamically.
Implementation Method 1
generation of a magnetic field by the detector varying as based on time, creation of Eddy (Foucault) currents by this magnetic field which are rotational on a conductive target, behavior of the target as a counter magnetic transmitter due to these Eddy currents
Implementation Method 2
creation of Eddy (Foucault) currents by this magnetic field which are rotational on a conductive target
Implementation Method 3
positional tracking unit with sensors for real-time optical flow detection
Implementation Method 4
magnetometer etc. collecting data by tracking the position of the search head
Implementation Method 5
measurement precision and classification of targets as ferromagnetic or non-ferromagnetic types
Data Source
AI summary
Metal detectors are disclosed herein containing integrated positional tracking unit (20) containing the sensors and processors which provide the detection of the real-time positions of the search head (11) on the ground during metal target (1) searching process, by optical flow technique as (X, Y) points on an image frame at X, Y coordinate plane, following the verification and if required, correction of the parameters of height from the ground, horizontal and axial motions, angular position, focus distance, light quantity and quality; image processing/display unit (30), a shaft mount display and/or a screen, generating the image of the target (1) metal by matching the metal data received from the detector signal processing system (12), thereby from the search head (11) and the location and position data received from the integrated positional tracking unit (20), on a position/image matrix and presenting such image to the user visually.