Systems and Methods for Motion-Vector-Aided Video Interpolation Using Real-Time Smooth Video Playback Speed Variation

Abstract

Systems and methods for encoding and playing back video at adjustable playback speeds by interpolating frames to achieve smooth playback in accordance with embodiments of the invention are described. One embodiment includes a source encoder that includes a processor, memory including an encoder application, where the encoder application directs the processor to: select a subset of frames from a first video sequence; generate motion vectors describing frames from the first video sequence that are not part of the selected subset of frames, where each motion vector describes movement between a frame in the subset of frames and a frame not included in the subset of frames; store the motion vectors; decimate frames not included in the subset of frames from the first video sequence to generate a second video sequence having a nominal frame rate less than the frame rate of the first video sequence; and encode the second video sequence at the nominal frame rate.

What is claimed is: 
     
         1 . A source encoder, comprising:
 a processor;   memory including an encoder application;   where the encoder application directs the processor to:
 select a subset of frames from a first video sequence; 
 generate motion vectors describing frames from the first video sequence that are not part of the selected subset of frames, wherein each motion vector describes movement between a frame in the subset of frames and a frame not included in the subset of frames; 
 store the motion vectors; 
 decimate frames not included in the subset of frames from the first video sequence to generate a second video sequence having a nominal frame rate less than the frame rate of the first video sequence; and 
 encode the second video sequence at the nominal frame rate.