Camera Focus-Limit Control for Display-Background Video
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Solution Overview
Problem
Existing video shooting methods against a display background require significant post-processing to replace backgrounds, and inaccuracies occur when subjects and backgrounds share similar colors, while using a screen background reduces post-processing but necessitates a display system at the shooting location.
Innovation Solution
A system that controls camera focus and blurs display backgrounds based on the relative locations of the camera and display wall, using a link device to coordinate focus commands between the camera and display controller, ensuring accurate focus and reduced post-processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If post-processing is used to replace background with chroma keying, then flexibility of background replacement is improved, but processing time and computational resources increase significantly
Solution Approach 1:
The patent applies preliminary action by pre-rendering background images at multiple resolutions and storing them in a cache before video recording begins. This allows the system to quickly retrieve and display appropriate background resolutions during recording without performing time-consuming processing during post-production, thus resolving the contradiction between background replacement flexibility and processing time.
2Loss of time
If screen display system is used as background, then post-processing requirements are reduced, but system complexity increases due to display hardware requirements
Solution Approach 1:
The patent applies copying by creating simplified graphical representations (copies) of complex 3D environments at reduced resolutions. These 2D background images serve as substitutes for full 3D rendering, reducing the computational complexity of the display system while eliminating post-processing requirements. The system displays these pre-generated background images on screens without needing complex real-time rendering hardware.
3Manufacturing precision
If high resolution background images are displayed, then background quality is improved, but bandwidth and storage requirements increase
Solution Approach 1:
The patent applies local quality by implementing a resolution adaptation system that displays background images at different resolutions based on the specific recording scenario. The system stores multiple versions of background images at various resolutions and selectively retrieves the appropriate resolution level, ensuring high quality when needed while reducing storage requirements by not uniformly maintaining all backgrounds at maximum resolution.
Solution Approach 2:
The patent applies dynamics by making the background image resolution dynamic rather than static. The system automatically adjusts the displayed background resolution based on factors such as camera position, subject distance, and recording duration. This dynamic adaptation allows the system to use high resolution only when necessary for quality, while using lower resolutions for extended periods, thereby reducing overall storage and bandwidth requirements.
Data Source
AI summary
A controller for a video camera, the controller comprising: an input for receiving a focus command indicative of a focus distance; and one or more outputs for transmitting a first signal for controlling the focus of a lens of the camera and a second signal indicative of the focus distance indicated by the focus command; the controller being configured to determine a focus limit and to transmit the first signal so as to command the camera to adjust its focus to the distance indicated by the focus command only if that distance does not exceed the focus limit.