Image Capture Scene Recognition Control for Shaded Lighting Compensation
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Solution Overview
Problem
Image capture devices often produce images with significant brightness variations and shadows, especially in indoor settings with single light sources, leading to poor image quality and loss of details when printed or viewed electronically.
Innovation Solution
An image capture scene recognition control method that analyzes a preview image to determine if it is shaded by extracting brightness components, estimating their distribution, calculating relative entropy, and controlling the device's light source to compensate for shadows, thereby improving image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If image capture device is used in indoor single light source environment, then image capture function is achieved, but image quality deteriorates with shadows and brightness variations
Solution Approach 1:
The system performs preliminary analysis of the preview image brightness distribution before actual capture. By calculating the brightness distribution estimation and comparing it with ideal distribution in advance, the system determines whether to activate the flashlight to compensate for shadows, ensuring optimal image quality before the capture moment.
Solution Approach 2:
The system uses feedback from brightness distribution analysis to control the flashlight activation. The brightness component extraction and relative entropy calculation provide feedback about the current lighting conditions, which automatically triggers the flashlight to compensate for shadows, resolving the contradiction between maintaining capture function and ensuring image quality.
2Manufacturing precision
If flashlight is activated to compensate light source, then image quality improves, but energy consumption increases
Solution Approach 1:
The system changes the operational parameters of the flashlight based on analyzed brightness distribution. Instead of continuously activating the flashlight, the system adjusts its activation state (on/off) based on the calculated relative entropy between actual and ideal brightness distributions, optimizing energy consumption while maintaining image quality when needed.
Solution Approach 2:
The image capture device autonomously determines when flashlight compensation is needed by analyzing its own preview image brightness distribution. The system self-regulates energy consumption by activating the flashlight only when the brightness analysis indicates shadow problems, without requiring manual user intervention or continuous energy expenditure.
3Measurement precision
If brightness distribution analysis is performed, then shaded scene recognition accuracy improves, but computational complexity increases
Solution Approach 1:
The system extracts only the brightness component from the preview image for analysis, separating it from other image properties. By focusing computation only on the brightness channel rather than analyzing the complete color image, the system achieves accurate shaded scene recognition while reducing computational complexity through selective extraction of relevant information.
Data Source
AI summary
Disclosed are an image capture scene recognition control method and apparatus and an image capture device. The method comprises the following steps: obtaining a preview image of a current image capture scene collected by an image capture device; extracting a brightness component of the preview image, and obtaining brightness component information of the preview image; obtaining a distribution estimation of the brightness component information and a desired ideal brightness distribution; determining the relative entropy between the distribution estimation of the brightness component information and the desired ideal brightness distribution; according to the relative entropy, determining whether the current image capture scene is a shaded image capture scene; when determined that the current image capture scene is a shaded image capture scene, controlling the image capture device such that the light source of the image capture device compensates the light source in the shaded image capture scene.