Imaging Apparatus Dynamic Exposure Control for High Chroma Saturation
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Solution Overview
Problem
Existing imaging apparatuses face difficulties in obtaining desired color reproduction characteristics for images taken under non-standard conditions, particularly when dealing with high chroma subjects, as image signals can become saturated, leading to lost chroma information and inaccurate color difference representation.
Innovation Solution
An imaging apparatus that analyzes brightness information for each hue region of an image signal and performs exposure control to enhance chroma, segmenting hue regions based on brightness and color to optimize chroma representation, using configuration information from specific color spaces to adjust exposure settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If image processing is carried out with predetermined color reproduction characteristics for standard imaging conditions, then images taken under standard conditions achieve desired color reproduction, but images taken under non-standard conditions (such as bright sunlight with high chroma subjects) cannot obtain desired color reproduction characteristics and may become saturated
Solution Approach 1:
The patent implements dynamic exposure control that adapts to different imaging conditions by analyzing brightness information in real-time and adjusting exposure settings accordingly. The system transitions from static predetermined color reproduction characteristics to dynamic adaptation based on actual scene conditions, allowing the imaging apparatus to optimize color reproduction for each specific scenario rather than relying on fixed parameters
Solution Approach 2:
The patent changes exposure parameters based on analyzed brightness information from the scene. By calculating appropriate exposure adjustments according to the brightness distribution and chroma characteristics of the subject, the system dynamically modifies exposure settings to prevent saturation while maintaining desired color reproduction characteristics across various imaging conditions
2Ease of manufacture
If correction is carried out on a saturated image signal, then processing can still be performed, but chroma information is already lost before correction, making it difficult to obtain a picked-up image of appropriate chroma
Solution Approach 1:
The patent performs preliminary exposure control based on brightness analysis before the image signal becomes saturated. By analyzing the brightness information of the scene and pre-calculating appropriate exposure adjustments, the system prevents chroma information loss from occurring in the first place, rather than attempting to recover lost information after saturation has occurred
Solution Approach 2:
The patent implements a feedback mechanism where brightness information from the scene is analyzed and used to adjust exposure settings. This closed-loop control system continuously monitors scene conditions and modifies exposure parameters accordingly, preventing saturation before it occurs and preserving chroma information throughout the imaging process
3Measurement precision
If analysis is carried out using a color difference signal, then color difference can be measured, but when the image signal is saturated at the time of imaging, the color difference signal does not correctly express the color difference of the subject
Solution Approach 1:
The patent performs preliminary exposure control based on brightness analysis before the image signal becomes saturated. By adjusting exposure settings in advance based on scene brightness characteristics, the system ensures that the color difference signal remains within the linear range where accurate color difference measurement is possible, preventing the reliability degradation that occurs with saturation
Data Source
AI summary
An imaging apparatus includes an image analysis unit obtaining brightness information for respective hue regions from an image signal of a picked-up image and an exposure control unit carrying out exposure control based on the brightness information obtained in the image analysis unit.