Universal Pyramids

The functions described in this section operate with universal image pyramids. These pyramids use separable symmetric kernel (not only Gaussian type) and downsampling/upsampling with arbitrary factor (not only 2). The next pyramid layer can be built for an image of an arbitrary size. These pyramids are used in some computer vision algorithms, for example, in optical flow calculations.

Note

All universal pyramid functions use the mirrored border.

Example 14-5 shows how to build pyramids and calculate the optical flow for two images.

• PyramidInitAlloc
  Allocates memory and initializes a pyramid structure.
• PyramidFree
  Frees memory allocated for the pyramid structure.
• PyramidLayerDownInitAlloc
  Allocates memory and initializes a structure for creating a lower pyramid layer.
• PyramidLayerDownFree
  Frees memory allocated for the lower pyramid layer structure.
• PyramidLayerUpInitAlloc
  Allocates memory and initializes a structure for creating an upper pyramid layer.
• PyramidLayerUpFree
  Frees memory allocated for the upper pyramid layer structure.
• GetPyramidDownROI
  Computes the size of the lower pyramid layer.
• GetPyramidUpROI
  Computes the size of the upper pyramid layer.
• PyramidLayerDown
  Creates a lower pyramid layer.
• PyramidLayerUp
  Creates an upper pyramid layer.
• Example of Using General Pyramid Functions
  

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