Image Capturing Device Metering Mode Selection
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Solution Overview
Problem
Digital cameras often struggle to select the most suitable metering mode for different shooting scenes, leading to issues such as overexposure or underexposure in images, as existing methods rely on user selection or fixed modes that do not adapt to changing conditions.
Innovation Solution
An image capturing device that automatically selects the metering mode based on analysis of the color temperature, ambient brightness, and focus distance of the previous image, switching between average, center-weighted average, and spot metering modes to achieve optimal exposure compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed metering mode is used in digital cameras, then the device complexity is reduced and ease of operation is improved, but the adaptability to different shooting scenes deteriorates and exposure quality worsens
Solution Approach 1:
The patent implements dynamic metering mode selection by automatically switching between average metering mode, center-weighted average metering mode, and spot metering mode based on real-time analysis of scene brightness distribution, color temperature, and subject position. This dynamic adaptation resolves the contradiction by making the metering system flexible and responsive to different shooting conditions while maintaining automatic operation without user intervention.
2Adaptability or versatility
If average metering mode is used for outdoor panoramic photos, then the adaptability to bright scenes is improved and sky area details are preserved, but the exposure compensation may be insufficient for darker central subjects
Solution Approach 1:
The patent applies local quality by implementing center-weighted average metering mode that assigns different weight values to different regions of the image frame. The central region receives higher weight while peripheral regions receive lower weights, allowing the system to prioritize exposure accuracy for the main subject in the center while still considering the overall scene brightness distribution, thus resolving the exposure precision issue for central subjects in bright outdoor scenes.
3Manufacturing precision
If spot metering mode is used for central subject, then the exposure precision for the subject is improved, but the adaptability to bright areas deteriorates and overexposure occurs
Solution Approach 1:
The patent implements dynamic metering mode selection that switches from spot metering mode to average or center-weighted average metering mode when the scene contains large bright areas such as sky. The system analyzes the brightness distribution and color temperature to determine when spot metering would cause overexposure of bright areas, and automatically adjusts the metering mode accordingly, thus resolving the contradiction between subject exposure precision and overall scene adaptability.
4Adaptability or versatility
If user manually selects metering mode, then the adaptability to specific scenes can be improved, but the ease of operation deteriorates and shooting efficiency is reduced
Solution Approach 1:
The patent implements self-service by enabling the image capturing device to automatically analyze scene characteristics including brightness distribution, color temperature, and subject position, then autonomously select the most appropriate metering mode without requiring user intervention. The system serves itself by making intelligent decisions based on pre-defined algorithms that evaluate multiple scene parameters, thus resolving the contradiction by providing both high adaptability and ease of operation through automatic mode selection.
Data Source
AI summary
A method for selecting metering mode and an image capturing device thereof are provided. The method includes: obtaining a first exposure compensation value, a first white balance compensation value and a first focus distance corresponding to a first image; determining whether a first color temperature corresponding to the first white balance compensation value is greater than a predetermined color temperature; if yes, determining whether an ambient brightness corresponding to the first exposure compensation value is greater than a predetermined brightness, and if yes, setting a metering mode to be an average metering mode, while if not, setting the metering mode to be a center-weighted average metering mode; and if not, determining whether the first focus distance is greater than a predetermined focus distance, and if yes, setting the metering mode to be the center-weighted average metering mode, while if not, setting the metering mode to be the spot metering mode.