Photogrammetry

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Photogrammetry
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Linear Triangulation Methods
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Linear Triangulation Methods
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Correlation Problem

• Assumptions
• Most Scene Points are VISIBLE ( both Viewpoints )
• Corresponding Image Regions are SIMILAR
• Element ( left Image ) ? Corresponding element (
  right Image )
• Algorithms
• Correlation Based Methods
• Feature Based Methods

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Correlation Based Methods

• Image Window of Fixed Size
• Measure of the Correlation ( Windows in the 2
  Images )

The Disparity of
2W1 Width of Correlation Window R(pl)
Search Region ( Right Image )
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Correlation Based Methods

• The Output
• Array of Disparities ( the Disparity Map )

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Correlation Based Methods

• Same Set of Correspondence
• Energy of R Image inside window is Constant (
  search region )
• SSD preferable to Cross Correlation
• Not Biased by presence of regions ( very Small,
  Large Intensity Values )

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