Presentation Mixer Background Removal for Video Mixing
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Solution Overview
Problem
Videoconferencing systems face limitations due to bandwidth, CPU load, and low resolution, leading to poor video quality and user experience, especially when trying to display both presentation slides and live video feeds on a single screen without compromising the benefits of high-definition conferencing.
Innovation Solution
A telecommunications system that includes a multipoint control unit with a presentation mixer to remove backgrounds from presentation slides and mix live video feeds as a substitute background, allowing for full-screen display with adjustable transparency, enabling effective use of high-definition monitors while accommodating physical and financial constraints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If picture-in-picture technique is used to display live video feed on a single screen, then presentation slides can be displayed, but the video feed becomes difficult to see and HD videoconferencing benefits are eliminated
Solution Approach 1:
The patent applies transparency adjustments to the video feed overlay, allowing it to appear semi-transparent over the presentation slides. This enables the video content to be visible while maintaining the visibility of underlying slide content, effectively resolving the contradiction between display area and video quality visibility.
2Measurement precision
If multiple displays are used to show presentation and video feed separately, then both can be seen clearly, but physical and financial constraints make this inconvenient
Solution Approach 1:
The patent merges the presentation slides and live video feed into a single composite display by overlaying the video feed with adjusted transparency over the slides. This combining of previously separate displays into one unified display resolves the contradiction between video quality visibility and device complexity.
Solution Approach 2:
The patent uses transparency as an additional visual dimension to resolve the display conflict. By adjusting the transparency level of the video feed overlay, both the video content and presentation slides can be simultaneously visible in the same spatial plane, eliminating the need for multiple physical displays.
3Adaptability or versatility
If background is removed from presentation slides, then video feed can be mixed in as substitute background, but processing complexity increases
Solution Approach 1:
The patent extracts the background layer from the presentation slides to allow the live video feed to be inserted as a substitute background. This extraction enables flexible composition where the video feed can be blended with the slide content at adjustable transparency levels, achieving display flexibility while managing processing complexity through targeted background removal rather than full scene analysis.
Data Source
AI summary
A telecommunications system includes a network; a plurality of user devices coupled to the network; a multipoint control unit coupled to the network and configured to supervise multipoint conferencing among the plurality of user devices, the multipoint control unit including a presentation mixer, the presentation mixer configured to remove one or more backgrounds from a presentation and mix a live video feed into the presentation as a substitute background; a screen for displaying a resulting mixed presentation such that a full area of the screen is used to display the mixed presentation; and a feature recognition system configured to identify a party from one or more features displayed on the screen and selectively adjust a transparency of said one or more features other than said party.