US 8830293

US patent 8830293, titled "Video superposition for continuous presence," was issued to Cisco Technology Inc. on September 9, 2014, from an application filed on May 26, 2009. The inventors are J. William Mauchly and Richard Thayer Wales.

Abstract:
The patent describes techniques for combining video frames from two or more real-time video streams into a single combined video stream for continuous presence in applications like video conferencing. Each original video stream contains a subject image and a background image. The core idea involves positioning the subject image from a first video stream in an anterior (foreground) portion of the combined frame and the subject image from a second video stream in a posterior (background) portion. The combined video stream is then displayed, aiming to provide a more natural and life-like viewing experience of multiple participants without significantly reducing individual image sizes.

Independent Claims Overview:

• Claim 1 (Method): This claim outlines a method for achieving continuous presence in video conferencing. It involves receiving at least two real-time video streams, each with a subject and background image. The key steps for combining these streams include:

  1. Scaling the video frames of the first video stream and repositioning their pictures in a first direction to create a sequence of scaled frames.
  2. Removing the background image from these scaled first video frames to produce "first background separated video frames," which are intended for the anterior (foreground) portion of the combined output.
  3. Superimposing these first background separated video frames onto corresponding video frames of the second video stream to generate the combined video frames.
     Finally, this combined video stream is supplied to a video display.

• Claim 10 (Apparatus): This claim describes an apparatus designed to perform similar video superposition functions. The apparatus includes a first memory for storing data from at least two real-time video streams (each with subject and background images) and at least one data processor. The data processor is configured to combine subject images by:

  1. Scaling the video frames of the first video stream and repositioning their pictures in a first direction to produce a sequence of scaled video frames.
  2. Removing the background image from these scaled first video frames to create "first background separated video frames" for the anterior portion of the combined output.
  3. Superimposing these first background separated video frames onto corresponding video frames of the second video stream to generate the combined video frames.

• Claim 13 (Logic/Non-transitory Storage Media): This claim covers logic encoded in one or more tangible non-transitory storage media. When executed, this logic is operable to perform the method steps similar to Claim 1. Specifically, it enables a system to:

  1. Receive at least first and second real-time video streams, each with a subject and background image.
  2. Combine the subject images of corresponding video frames into a combined frame where the first video stream's subject is anterior and the second's is posterior. This combination involves:
     • Scaling the video frames of the first video stream and repositioning their pictures in a first direction.
     • Removing the background image from these scaled frames to produce first background separated video frames for the anterior portion.
     • Superimposing these first background separated video frames onto corresponding video frames of the second video stream.
  3. Supply the resulting combined video stream to a video display.

Litigation Information:
According to the provided patent text, the patent family has litigation associated with it. Specifically, a US case was filed in the Delaware District Court (Unified Patents Litigation Data). Additionally, a PTAB case IPR2025-01588 was filed (Not Instituted - Merits) (Unified Patents PTAB Data). I cannot definitively confirm current CAFC 2026 dockets directly for this patent number using the available search tools.