Virtual Illumination Control for Portable Terminal Images
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Solution Overview
Problem
Conventional portable terminals with digital cameras limit users to preset illumination effects, failing to reflect desired illumination effects in captured images, as they primarily rely on external light sources and lack the ability to customize virtual illumination.
Innovation Solution
A method and portable terminal that allow users to set and display virtual illumination effects on captured images, including recognizing facial features and applying customizable virtual lighting positions, types, and brightness levels, using a controller and display unit to implement these settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional portable terminal with digital camera uses preset illumination effects, then the device complexity is reduced, but the adaptability or versatility is limited
Solution Approach 1:
The patent creates a virtual illumination effect by copying and simulating light source characteristics in software rather than using physical light sources. The controller generates virtual illumination data that mimics different lighting conditions, allowing multiple illumination effects without additional hardware components.
Solution Approach 2:
The patent changes illumination parameters (position, brightness, color temperature) through software control rather than physical adjustment. By modifying digital parameters in the captured image data, the system achieves versatile illumination effects without increasing device complexity.
2Illumination intensity
If portable terminal relies on external light sources, then the device complexity is minimized, but the illumination intensity and control are insufficient
Solution Approach 1:
The patent replaces the mechanical/optical illumination system with a digital processing system. Instead of using physical lights to illuminate the subject, the system captures the scene and applies virtual illumination through image processing, substituting mechanical light sources with computational methods.
Solution Approach 2:
The virtual illumination effect is achieved by copying light interaction patterns and applying them digitally to the captured image. The system simulates how light would interact with the subject based on virtual light source parameters, creating realistic illumination effects without physical light sources.
3Measurement precision
If conventional digital camera captures image with external light, then the measurement precision of light conditions is limited, but the ease of operation is maintained
Solution Approach 1:
The system incorporates feedback by analyzing the captured image to detect actual lighting conditions and then adjusting the virtual illumination parameters accordingly. This feedback loop allows the system to automatically adapt to the captured scene's lighting, improving measurement precision while maintaining ease of operation through automatic adjustment.
Data Source
AI summary
An image displaying method using virtual illumination and a portable terminal using the method are provided. The method includes recognizing a face of a person in a captured portrait, setting virtual illumination in the captured portrait, and displaying a virtual illumination effect according to the set virtual illumination. Therefore, the user can apply desired illumination effect to the captured image to generate an effect that the image was captured under an external light source.