Camera Exposure-Based Light Source Brightness Control
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Solution Overview
Problem
Existing electronic devices face challenges in efficiently controlling the brightness of light sources, such as displays, in response to ambient environment conditions without relying on additional illuminance sensors, which can be costly and complex.
Innovation Solution
An electronic device equipped with a camera captures images of the ambient environment to determine exposure information, which is used to calculate the brightness of the ambient environment, allowing the device to adjust the light source's brightness accordingly, eliminating the need for separate illuminance sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an illuminance sensor is used to sense ambient brightness, then the accuracy of brightness measurement is improved, but the device complexity and cost increase
Solution Approach 1:
The camera is utilized for multiple purposes: primary function of capturing images and secondary function of sensing ambient brightness. By extracting exposure information from the camera's image capture process, the system eliminates the need for a dedicated illuminance sensor, thereby reducing device complexity while maintaining brightness measurement capability
Solution Approach 2:
The camera serves itself by providing exposure information that can be repurposed for ambient brightness sensing. The exposure data, originally intended for image processing purposes, is reused to determine environmental brightness conditions, eliminating the need for separate sensing hardware
2Adaptability or versatility
If an illuminance sensor is added to control light source brightness, then the adaptability to ambient conditions is improved, but the device complexity increases
Solution Approach 1:
The camera performs dual functions: image capture and ambient brightness sensing. The exposure information obtained during normal camera operation is utilized to determine ambient conditions, enabling the device to adapt to different lighting environments without adding dedicated sensing components
Solution Approach 2:
The exposure information acts as an intermediary that bridges image capture and ambient brightness sensing. By using this intermediate data from the camera's exposure process, the system can infer ambient brightness conditions and adjust light source accordingly, avoiding direct coupling with additional sensors
3Measurement precision
If additional illuminance sensors are used, then the control accuracy of light source brightness is improved, but the cost increases
Solution Approach 1:
The camera is repurposed to serve as both an image capture device and an ambient brightness sensor. By extracting and utilizing exposure information from the camera's normal operation, the system achieves accurate ambient brightness determination without requiring additional illuminance sensors, thereby reducing component costs
Solution Approach 2:
Instead of using a physical illuminance sensor, the system creates a functional copy by utilizing the camera's exposure data. The exposure information serves as a proxy measurement for ambient brightness, providing the necessary control data without duplicating sensing hardware
Data Source
AI summary
An electronic device for controlling a brightness of a light source and an operating method of the electronic device are provided. According to the electronic device and the operating method, an image including an ambient environment of a light source is captured, information of an exposure of the captured image is obtained, information about a brightness of the ambient environment of the light source is determined based on the information about the exposure, and a brightness of the light source is controlled based on the determined information about the brightness of the ambient environment.