Camera-Based Humidity Measurement via Optical Flow Feature Vectors
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Solution Overview
Problem
Existing humidity measurement technologies, such as infrared sensing, are not suitable for everyday use due to high environmental and acquisition condition requirements, necessitating a simpler method for humidity measurement.
Innovation Solution
An electronic device with a camera and processing module that captures and preprocesses images to calculate humidity by tracking optical flow feature vectors between images, using a formula derived from known humidity conditions, allowing for accurate and user-friendly humidity measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If infrared sensing is used for humidity measurement, then measurement capability is provided, but device complexity and environmental requirement requirements increase
Solution Approach 1:
The patent replaces complex infrared sensing systems with a camera-based optical system. Instead of using specialized infrared sensors that require specific environmental conditions, the invention uses a standard camera to capture images and processes them through image processing algorithms to derive humidity information, thereby simplifying the device and reducing environmental requirements
Solution Approach 2:
The patent introduces image processing as an intermediary between the camera and humidity measurement. By processing images through specific algorithms that analyze optical flow and feature points, the system transforms visual data into humidity information, enabling humidity measurement using common camera hardware without requiring specialized sensors
2Ease of operation
If simple camera-based method is used for humidity measurement, then ease of operation improves, but measurement accuracy may deteriorate
Solution Approach 1:
The patent performs preliminary actions by capturing multiple images at different time points and pre-processing them to extract feature points and optical flow vectors. These preliminary processing steps prepare the data in advance for the final humidity calculation, ensuring accuracy while maintaining ease of use through automated processing
Solution Approach 2:
The patent employs feedback mechanisms where the system continuously captures images, processes them to obtain humidity values, and can compare these values against expected ranges or previous measurements. This feedback loop ensures accuracy by validating results and allowing for corrective actions if measurements fall outside acceptable ranges
Data Source
AI summary
A method for measuring humidity at long range using simplified equipment includes creating a formula according to a relationship between multiple sets of known optical flow feature vectors and a known humidity. First and second images are obtained, wherein the first image and the second image are captured as being in the same range of capture. A plurality of feature points in the first image is obtained and an optical flow feature vector for each of the feature points according to apparent changes in position of each feature point according to the second image are calculated. The degree of current humidity according to the optical flow feature vectors and the formula is thus obtained.