Monocular Fish Speed Estimation Using Apparent Body Length
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Solution Overview
Problem
Existing methods for estimating the movement speed of aquatic organisms, such as cultivated fish, are costly due to the need for multiple cameras and complex optical flow processing, leading to potential inaccuracies in speed estimation.
Innovation Solution
A movement speed estimation system using a monocular camera to calculate apparent body length and movement amount from video images, estimating speed based on these parameters with a simple configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple cameras are used to estimate movement speed through triangulation, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts and utilizes only the essential information (apparent body length and movement amount) from the video images obtained by a single camera, eliminating the need for multiple cameras and complex triangulation processing while maintaining sufficient estimation accuracy
Solution Approach 2:
The patent creates a simplified model of movement speed estimation that copies the functional outcome of complex multi-camera systems by using image-based apparent length measurements and movement tracking from a single camera perspective
2Measurement precision
If multiple cameras are used to estimate movement speed, then measurement precision is improved, but cost increases
Solution Approach 1:
The patent replaces expensive multiple camera systems with a single inexpensive monocular camera, achieving cost reduction while maintaining acceptable measurement precision through alternative processing methods
Solution Approach 2:
The patent extracts only the necessary measurement information from single-camera video feeds, eliminating the need for expensive multi-camera hardware while preserving estimation functionality
3Measurement precision
If optical flow processing is used to estimate movement speed, then measurement precision is improved, but device complexity increases and accuracy decreases due to photographing equipment influence
Solution Approach 1:
The patent extracts and measures only the apparent body length and movement amount directly from video images, avoiding complex optical flow processing and its associated vulnerabilities to camera calibration and environmental factors
Solution Approach 2:
The patent creates a simplified estimation model that copies the essential measurement function without relying on complex optical flow algorithms, thereby reducing processing complexity and improving robustness
Data Source
AI summary
A movement speed estimation device comprises: a body length calculation unit for calculating, from a video obtained by imaging an aquatic organism with a monocular camera, an apparent body length in the video of a specific portion of the aquatic organism; a movement amount calculation unit for calculating an apparent movement amount in the video of the aquatic organism in a predetermined period of the video; and an estimation unit for estimating the movement speed of the aquatic organism on the basis of the apparent body length and the apparent movement amount.