LED Flash White Balance Correction via Color Temperature Feedback
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Solution Overview
Problem
Digital cameras using LEDs as flash sources face challenges in maintaining consistent color temperature, leading to variations in white balance, especially due to ambient temperature changes and applied current fluctuations, resulting in unstable image color shades during flash shooting.
Innovation Solution
Incorporating a storage device for correction information, a white balance correcting device, and temperature or current detecting mechanisms to adjust white balance settings based on actual LED color temperature and ambient conditions, ensuring consistent image color across different LED products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an LED is used as a flash light source, then the flash can be performed while a shutter is released slowly and the color can be adjusted, but the color temperature varies among products and according to ambient temperature and applied current, resulting in varied white balance correction results
Solution Approach 1:
The patent implements a feedback mechanism by detecting the actual color temperature of the LED flash light source and using this information to adjust the white balance correction. The detection unit measures the color temperature, and the correction unit modifies the white balance settings based on this detected value, creating a closed-loop system that compensates for variations in LED performance across products and operating conditions.
Solution Approach 2:
The patent changes the parameter of white balance correction dynamically based on the detected color temperature. Instead of using fixed white balance settings, the system adjusts the correction parameters in real-time according to the actual color temperature measured during flash operation, ensuring consistent color reproduction despite variations in LED characteristics and operating conditions.
2Reliability
If the white balance correction is based on detected actual color temperature, then the color shade stability is improved, but the device complexity increases due to additional detection and correction mechanisms
Solution Approach 1:
The system performs self-service by using the LED flash light source itself to provide the color temperature information needed for white balance correction. The detection unit measures the color temperature of the actual light emitted during flash operation, eliminating the need for separate reference light sources or complex calibration systems, thus achieving accurate correction with minimal additional hardware.
Solution Approach 2:
The patent replaces complex mechanical or hardware-based color calibration systems with an electronic detection and correction approach. Instead of using physical calibration standards or manual adjustment mechanisms, the system uses electronic color temperature detection and digital signal processing to achieve precise white balance correction, reducing mechanical complexity while improving accuracy.
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
This solution ensures that images captured using LEDs as flash sources have stable color shades, regardless of variations in color temperature caused by ambient temperature changes or current fluctuations, by dynamically adjusting white balance settings.
Implementation Method 1
an electronic flash device using a light-emitting diode (LED) as a flash light source
Data Source
AI summary
In a digital camera including an electronic flash device using a light-emitting diode as a flash light source, white balance correction is performed by using a white balance correction value corresponding to a color temperature of light actually emitted from the electronic flash device.