July 2004
Intermediate to advanced
688 pages
19h 3m
English
Content preview from Emerging Topics in Computer VisionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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7.4. Optical Flow
Recently, over the last five years, optical flow techniques have really started to make a big impact on the film industry. In fact, there are a couple of companies that do fairly well selling software based on optical flow techniques.
Optical flow is the 2D motion of the features in an image sequence, from one frame to the next [1, 10]. Consider a pattern track centered on every pixel. After an optical flow analysis of an image sequence, a secondary frame is generated for every original image in the sequence. This new image does not contain colors, but rather a 2D vector for each pixel. This vector represents the motion of the feature seen through the pixel from one frame to the next.
In an ideal case, if the pixels of the image ...
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