Image-Based Light Control for Object and Shadow Contrast
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Solution Overview
Problem
Conventional light control methods for lighting devices are inadequate as they rely solely on relative luminance ratios between key and back lights, failing to account for external factors like outside light and object shape, leading to improper light adjustment.
Innovation Solution
A light control system and method that utilizes an image capturing apparatus to detect object luminance, shadow contrast, and outline contrast values to adjust the light amount of lighting devices based on their roles, using processors to execute light control operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If light control is performed based only on relative luminance ratio between key light and back light, then the control method is simple, but the light control accuracy is insufficient due to ignoring external factors like outside light and object shape
Solution Approach 1:
The patent implements feedback by capturing actual images with an image capturing apparatus and using the captured image data (luminance, shadow contrast, outline contrast) to adjust and optimize the lighting device output. This closed-loop feedback mechanism allows the system to account for external factors like outside light and object shape, thereby improving light control accuracy while maintaining reasonable system complexity
Solution Approach 2:
The patent replaces traditional mechanical/optical light measurement methods with digital image processing. By using an image capturing apparatus and processing the captured images through detection units that calculate luminance and contrast values, the system achieves more accurate light control that considers all visual factors simultaneously, rather than relying on separate mechanical measurement devices
2Measurement precision
If light control is performed based on actually obtained image data, then the light control accuracy is improved, but the device complexity increases due to additional image capturing and processing components
Solution Approach 1:
The image capturing apparatus serves multiple functions: it captures images for light control feedback, detects object luminance, calculates shadow contrast, and determines outline contrast. By making the image capturing device multi-functional, the patent avoids adding separate measurement devices for each parameter, thereby improving light control accuracy while minimizing the increase in system complexity
Solution Approach 2:
The patent combines the image capturing apparatus, detection unit, and light control functions into an integrated system. The detection unit merges the calculation of multiple parameters (luminance, shadow contrast, outline contrast) from a single captured image, and combines this with the light control function to create a unified system that achieves high accuracy without proportionally increasing complexity
Data Source
AI summary
A light control system including an image capturing apparatus having an image capturing section for acquiring an image of an object, a lighting device having a light emitting section, and a light control device. The image capturing apparatus includes a communication section that communicates with the lighting device and the light control device, and a controller that detects at least one information of an object luminance, a shadow contrast value, and an outline contrast value, from the acquired object image. The lighting device includes a communication section that communicates with the image capturing apparatus, and a controller that sets a light amount of the light emitting section. The light control device includes a communication section that communicates with the image capturing apparatus, and a controller that performs light control of the lighting device according to the detected information and a role of the lighting device.