Virtual Studio Scene Control for Stable Exposure and Background Brightness
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Solution Overview
Problem
Existing in-camera VFX video systems face issues with exposure settings changing due to scene brightness variations, leading to noise and over/underexposure of backgrounds, which affect the quality of captured images.
Innovation Solution
A scene control apparatus and method that adjusts the brightness of lighting equipment and background images based on luminance information to maintain consistent exposure settings, using processors to determine and control lighting and image brightness to prevent over/underexposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If automatic exposure (AE) function is used to adjust exposure settings in response to scene brightness changes, then the subject can be correctly exposed, but the background may become overexposed or underexposed and the exposure settings change during shooting
Solution Approach 1:
The system determines appropriate exposure settings before capturing the moving image, based on luminance information from the initial captured scene. By pre-determining exposure settings that will maintain consistency throughout the shooting sequence, the system avoids mid-shooting adjustments that would change depth of field and other exposure parameters.
Solution Approach 2:
The system uses luminance information from the captured scene as feedback to determine and adjust exposure settings. The luminance information serves as a measure of scene brightness, and this feedback loop allows the system to select exposure settings that will maintain proper exposure while keeping settings stable throughout the sequence.
2Measurement precision
If exposure settings are changed to adapt to scene brightness changes, then subject exposure can be maintained, but noise in the video increases
Solution Approach 1:
The system determines appropriate exposure settings before capturing the moving image sequence, based on luminance information from the initial captured scene. By pre-determining exposure settings that will maintain consistency throughout the shooting sequence, the system avoids mid-shooting adjustments that would change depth of field and other exposure parameters.
3Stability of the object's composition
If sensitivity for capturing is controlled to prevent exposure setting changes, then depth of field remains constant, but the background may become overexposed or underexposed when subject brightness changes
Solution Approach 1:
The system performs spatial differentiation by separately determining exposure settings for the subject region and background region based on luminance information. This allows different exposure compensation to be applied to different areas of the scene, ensuring both subject and background are properly exposed while maintaining overall exposure setting stability.
Data Source
AI summary
A scene control apparatus capable of suppressing changes in exposure settings of a camera that captures video with an image as the background is disclosed. The apparatus acquires information relating to luminance of a captured scene of an image capture apparatus and determines, based on the information, whether a brightness of at least one of lighting equipment configured to light up the captured scene and video that is displayed as a background of the captured scene needs to be changed. According to a result of the determination, the apparatus changes the brightness of at least one of the lighting equipment that lights up the captured scene and the video that is displayed as the background of the captured scene.