Echo-Based Focus for Video Conferencing Cameras
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Solution Overview
Problem
Current auto focusing mechanisms in video conferencing cameras produce constant and distracting focus movements, leading to irritating artefacts and a poor user experience due to their reliance on persistent contrast-based searches.
Innovation Solution
The implementation of an echo-based focusing mechanism that uses audio pings to estimate the distance between the camera and the subject, allowing for more controlled and efficient refocusing operations by determining when and how to adjust the focus, thereby reducing the frequency and duration of auto focusing searches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If current auto focusing mechanisms use persistent contrast-based searches to achieve focus, then the camera can capture focused images, but visually evident focusing artefacts are produced that are irritating and distracting for participants
Solution Approach 1:
The patent replaces the mechanical/optical contrast-based focusing search mechanism with an acoustic echo-based distance measurement system. The system uses audio pings and echo timing to directly determine subject distance, eliminating the need for persistent visual contrast searches that cause focusing artefacts. This substitution of acoustic measurement for optical-mechanical searching resolves the contradiction by achieving focus accuracy without the harmful visual disturbances.
Solution Approach 2:
The patent introduces audio pings and echo measurements as an intermediary mechanism to determine subject distance. Instead of directly searching for focus through contrast-based mechanical adjustments, the system uses sound waves as a mediator to measure distance and calculate appropriate focus settings. This intermediary approach provides accurate focusing information without producing the irritating visual artefacts of traditional contrast-based searches.
2Reliability
If auto focusing mechanisms perform constant focusing operations to maintain focus on moving subjects, then focus can be maintained, but the frequency and duration of focusing operations increase causing more visual disturbances
Solution Approach 1:
The patent implements periodic audio pinging at controlled intervals to measure subject distance and trigger focusing operations only when necessary. Instead of continuous contrast-based searching, the system uses periodic acoustic measurements to determine when the subject distance has changed sufficiently to require refocusing. This periodic action maintains reliable focus while significantly reducing the frequency and duration of focusing operations, thereby reducing visual disturbances.
Solution Approach 2:
The system uses the existing audio communication infrastructure (speakers and microphones already present in video conferencing systems) to perform distance measurement and focus control. The audio pings leverage the existing acoustic environment and hardware, allowing the system to self-determine focus requirements without external intervention or additional specialized focusing hardware. This self-service approach maintains reliable focus with minimal operational overhead.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach minimizes visual disturbances and improves the stability of the image appearance for users by reducing unnecessary focus searches and ensuring that refocusing occurs only when necessary, resulting in a more effective and user-friendly video conferencing experience.
Implementation Method 1
Echo-based focus - a device may make, based on an echo reflected from a subject of an image capture, a determination that a distance between a camera and the subject of the image capture has stabilized
Data Source
AI summary
According to one or more embodiments of the disclosure, a device may make, based on an echo reflected from a subject of an image capture, a determination that a distance between a camera and the subject of the image capture has stabilized following a change in the distance. The device may determine whether to initiate a refocus of the camera on the subject based on the distance between the camera and the subject of the image capture following the change. The device may identify a focal search range of the refocus based on the distance between the camera and the subject of the image capture following the change. The device may cause the refocus on the subject using the focal search range.