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What is Image Warping?

Image warping remaps pixel coordinates according to a geometric transformation. It can correct perspective or lens distortion, align an image with a surface, or deliberately deform shapes for a visual effect.

How Image Warping works

Warping defines a mapping between source and destination coordinate systems, using a matrix, mesh, lens model, or dense displacement field. Production implementations usually inverse-map each destination sample into the source so every output location receives a value. An interpolation filter reconstructs values between source pixels, and a border rule handles coordinates outside the frame. The operation appears in calibration, stabilization, projection mapping, panorama assembly, retouching, and effects.

Key facts

  1. Forward-mapping source pixels can leave holes or collisions in the destination; inverse mapping avoids holes but still requires interpolation at fractional coordinates.
  2. A homography aligns views of a plane, or views related by pure camera rotation, but it cannot generally register parallax from objects at different depths.
  3. Strong minification needs adequate low-pass filtering before samples converge; otherwise compressed textures produce aliasing, moiré, or unstable detail.

When Image Warping matters

Select a transform model that matches the physical or artistic change, then resample with a filter suited to the output scale. Extreme warps can expose empty regions, blur detail, or create aliasing where pixels are compressed.

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