Systems, devices and methods for video encoding and decoding

A device for video encoding, the device comprising:

• background-image-acquisition instructions stored on non-transitory computer readable media which when executed by one or more processors cause the device to analyze one or more input images and obtain a background image from the one or more input images;
• background-frame-encoding instructions stored on the non-transitory computer readable media which when executed by the one or more processors cause the device to encode the background image to obtain a background frame using an intra-frame-predictive-encoding method and decode the background frame to obtain a reconstructed image of the background frame;
• refreshment-frame-encoding instructions stored on the non-transitory computer readable media which when executed by the one or more processors cause the device to obtain a first image from the one or more input images and encode at least partially the first image to obtain a refreshment frame using an inter-frame-predictive-encoding method based at least in part on a difference between the first image and the reconstructed image of the background frame;
• common-frame-encoding instructions stored on the non-transitory computer readable media which when executed by the one or more processors cause the device to obtain a second image from the one or more input images and encode at least partially the second image to obtain a common frame by:
• encoding a first portion of the second image using the inter-frame-predictive-encoding method based at least in part on differences between the second image and the reconstructed image of the background frame and using the inter-frame predictive-encoding method based at least in part on differences between the second image and a reconstructed image of an adjacent preceding frame, the adjacent preceding frame being different from the background frame, and
• encoding a second portion of the second image using the inter-frame-predictive-encoding method based at least in part on a difference between the second image and the reconstructed image of the adjacent preceding frame;
• and
• bit-stream-generation instructions stored on the non-transitory computer readable media which when executed by the one or more processors cause the device to generate a video bit stream based at least in part on the background frame, the refreshment frame and the common frame.

A system for video encoding, the system comprising:

• one or more data processors;
• and
• one or more non-transitory computer-readable storage media encoded with instructions for commanding the data processors to execute operations including:
• analyzing one or more input images;
• obtaining a background image from the one or more input images;
• encoding the background image to obtain a background frame using an intra-frame-predictive-encoding method;
• decoding the background frame to obtain a reconstructed image of the background frame;
• obtaining a first image from the one or more input images;
• encoding at least partially the first image to obtain a refreshment frame using an inter-frame-predictive-encoding method based at least in part on a difference between the first image and the reconstructed image of the background frame;
• obtaining a second image from the one or more input images;
• encoding at least partially the second image to obtain a common frame by:
• encoding a first portion of the second image using the inter-frame-predictive-encoding method based at least in part on differences between the second image and the reconstructed image of the background frame and using the inter-frame-predictive-encoding method based at least in part on differences between the second image and a reconstructed image of an adjacent preceding frame, the adjacent preceding frame being different from the background frame, and
• encoding a second portion of the second image using the inter-frame-predictive-encoding method based at least in part on a difference between the second image and the reconstructed image of the adjacent preceding frame;
• and
• generating, using the one or more processors, a video bit stream based at least in part on the background frame, the refreshment frame and the common frame.

A processor-implemented method for video encoding, the method comprising:

• analyzing, using one or more processors, one or more input images;
• obtaining, using the one or more processors, a background image from the one or more input images;
• encoding, using the one or more processors, the background image to obtain a background frame using an intra-frame-predictive-encoding method;
• decoding, using the one or more processors, the background frame to obtain a reconstructed image of the background frame;
• obtaining, using the one or more processors, a first image from the one or more input images;
• encoding, using the one or more processors, at least partially the first image to obtain a refreshment frame using an inter-frame-predictive-encoding method based at least in part on a difference between the first image and the reconstructed image of the background frame;
• encoding a plurality of common frames, wherein a first common frame after the refreshment frame is encoded differently from other common frames;
• and
• generating, using the one or more processors, a video bit stream based at least in part on the background frame, the refreshment frame and the plurality of common frames.