Barrel-Based White Balance Filter for Accurate Color Temperature
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Solution Overview
Problem
Conventional white balance filters and lens caps fail to accurately measure the average color temperature of a photography scene due to poor design, leading to incorrect color temperature values and color shifts in photos and videos, especially when ambient light from outside the viewing range is included.
Innovation Solution
A barrel-based white balance filter with an opaque barrel and an axially adjustable milky white or gray filter that can be attached to a camera lens, allowing precise control over the amount of ambient light received, isolating the color temperature beyond the viewing scene and preventing vivid light from affecting the measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional white balance filter plate or lens cap is used, then the device structure is simple, but the measurement precision of color temperature is poor due to inclusion of ambient light beyond viewing range
Solution Approach 1:
The white balance filter is segmented into a barrel structure with a viewing range definition portion that divides the light-receiving area. This segmentation isolates the measurement area from ambient light sources outside the viewing range, allowing accurate color temperature measurement while maintaining a relatively simple overall structure.
Solution Approach 2:
The barrel structure acts as an intermediary element between the white balance filter and the ambient environment. It selectively transmits light from the viewing range while blocking ambient light from outside this range, thereby mediating the light interaction to achieve accurate measurement without excessive structural complexity.
2Measurement precision
If the white balance filter receives ambient light from all directions, then the device structure is simple, but the color temperature value becomes incorrect due to mixing with surrounding lights
Solution Approach 1:
The light-receiving surface is segmented by the viewing range definition portion of the barrel, creating a distinct measurement area separated from ambient light sources. This ensures that only light from the intended viewing range contributes to the white balance measurement, improving accuracy without requiring complex multi-component structures.
Solution Approach 2:
The barrel structure functions as a flexible light-isolating shell that defines the viewing range. It selectively blocks ambient light from directions outside the viewing range while allowing light from within the viewing range to reach the white balance filter, achieving precise light control with a relatively simple shell structure.
3Measurement precision
If sunlight and reflected light from blue sky and white clouds fall upon the filter, then the device structure remains simple, but the average color temperature value becomes incorrect
Solution Approach 1:
The viewing range definition portion extracts and isolates the desired light source area from the surrounding environment. By defining a specific viewing range, it excludes harmful ambient light factors such as sunlight and reflected light from blue sky and white clouds, allowing accurate color temperature measurement of the intended scene.
Solution Approach 2:
The barrel structure converts the potential harm of ambient light interference into a benefit by using the viewing range definition portion to selectively admit only the desired light. The structure that could potentially block light is instead used to define and protect the measurement area, turning a limitation into a precision-enhancing feature.
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 accurate measurement of the average white balance value, reducing color distortion and allowing for precise color temperature adjustments, ensuring perfect color representation in images.
Implementation Method 1
The barrel is made from an opaque material... uses the opaque barrel to isolate the color temperature beyond the camera scene
Implementation Method 2
The white balance component is a milky white or gray filter... having light transmissive property
Data Source
AI summary
A barrel-based white balance filter includes an opaque barrel attachable to a camera lens of a camera and a white balance component in the form of a milky white or gray filter having a milky white or gray annular rim and axially adjustably mounted in the opaque barrel so that the milky white or gray annular rim is protected by the opaque barrel against the radiation of vivid light or reflected light during a manual white balance operation when the white balance component is completely received in the opaque outer barrel, enabling the manual white balance system of the camera to measure the average white balance value of the viewing scene accurately.