Environment Light Calibration via Illuminance Sensor
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Solution Overview
Problem
Calibration with respect to environment light is challenging, especially when using a camera mounted on a drone to photograph a farmstead, as it is difficult to simultaneously capture a standard reflection plate with the inspection target, making it hard to perform accurate calibration.
Innovation Solution
An information processing device and method that estimates the color temperature of environment light based on detected illuminance values at multiple wavelength bands using an illuminance sensor, allowing for accurate calibration by diffusing environment light and using a diffusion plate to reduce brightness unevenness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a standard reflection plate is used for calibration, then measurement precision is improved, but device complexity and ease of operation deteriorate due to the difficulty of simultaneously photographing the reflection plate with the inspection target
Solution Approach 1:
The patent extracts the calibration function from the photographing process by using an illuminance sensor to independently measure environment light characteristics. This separates the calibration measurement from the target photographing, eliminating the need to simultaneously capture both the reflection plate and inspection target, thus improving ease of operation while maintaining measurement precision
Solution Approach 2:
The illuminance sensor acts as an intermediary device that measures environment light characteristics without requiring the standard reflection plate to be visible in the camera frame. This intermediary measurement approach allows calibration to be performed independently of the target photographing process, resolving the operational difficulty
2Measurement precision
If a standard reflection plate is used for calibration, then measurement precision is improved, but device complexity worsens due to additional equipment and setup requirements
Solution Approach 1:
The patent extracts the light measurement function from the camera system by using a dedicated illuminance sensor. This separation eliminates the need for the camera to capture the reflection plate, reducing device complexity while maintaining the ability to obtain accurate environment light characteristics for calibration
Solution Approach 2:
The illuminance sensor autonomously measures environment light characteristics without requiring manual setup of reflection plates or coordination with the camera framing. This self-service capability reduces operational complexity and eliminates the need for additional calibration equipment in the photographing path
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 easy and accurate estimation of environment light color temperature, improving the calibration process and enhancing the detection accuracy of spectral characteristics, thereby improving the evaluation index calculation.
Implementation Method 1
detected values of illuminances of the environment light at a plurality of wavelength bands, detected by an illuminance sensor
Implementation Method 2
diffusing environment light and using a diffusion plate to reduce brightness unevenness
Data Source
AI summary
To easily and accurately perform calibration with respect to environment light. In one example, an information processing device includes a memory configured to store detected values of illuminances of environment light; and a color temperature estimation unit configured to estimate a color temperature of the environment light, on a basis of detected values of illuminances of the environment light within a plurality of wavelength bands. The disclosed technology can, for example, be applied to a system that performs remote sensing on an agricultural land, and calculates an evaluation index such as a normalized difference vegetation index (NDVI).