24.3. About the Warp Lite Intel FPGA IP
The IP implements two warps:
- Vertical keystone (maximum 30% distortion along horizontal edge)
- Horizontal flip
The IP uses a two-dimensional perspective transform to define its warp mapping. The perspective transform is a flexible mapping that you define with eight parameters. The IP supports a minimum resolution of 128x128. Internal logic discards smaller frames. The IP supports a maximum resolution of full HD (1920x1080).
The warp transformation (refer Warp Definition Equations) allows for a much wider set of transforms than horizontal flip and vertical keystone. The Warp Lite IP implements a subset of these transforms that it can accommodate using on-chip RAM.
Vertical Keystone Distortion
The IP perspective transform can correct vertical keystone distortions.
The horizontal flip reverses the image across each line.
The IP uses line stores at its front end. You can read the line data out in reverse order and implement a horizontal flip function.
Warp Definition Equations
Resampling and Interpolation
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