Dynamosaics: Video Mosaics with NonChronological Time

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Dynamosaics Video Mosaics with Non-Chronological
Time

• CVPR 2005 (Oral)

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Problem Statement

• Two questions
• How to stitich a dynamic video into a panaroma?
• How to reverse a video while keeping its
  chronological order?

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Solution

• Use space-time volume to mosaic panoramic image.
• Sweeping the volume with a time front surface and
  generate a sequence of time slices.

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Space-Time Volume

• Constructed by registering and aligning the
  original sequences

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Mosaicing by an evolving Time Front

• Image Mosaicing a function maps
• each pixel in a synthesized mosaic image ? the
  input frame from which this pixel is taken and
  its location in that frame
• This function can be represented by a continuous
  slice (time slice) in the space-time volume

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Mosaicing by an evolving Time Front

• Many video effects can be manipulated by evolving
  time front
• a free-form surface that deforms as it sweeps
  through the space-time surface.

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Panoramic Dynamosaicing

• Using strips.
• Evolving the time front smoothly from the first
  slice to the last .

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• Results

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• Results

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Advancing Backwards in Time

• Keep the window size
• Keep the chronological order

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Advancing Backwards in Time

• Results

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Temporal Video Editing
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Temporal Video Editing
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Distortion Control

• Dropper Effect

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• Result