Image Transformations MCQ
Geometric transforms: translate, scale, rotate, affine vs projective warps, homogeneous coordinates, interpolation, and composition order.
Translate
Shift
Scale
Resize
Rotate
Euclidean
Warp
Affine / H
Geometric transformations
Aligning templates, augmenting datasets, rectifying documents, and stitching panoramas all rely on knowing how coordinates map under linear and projective models.
Affine vs homography
Affine preserves parallelism; homography models plane-to-plane perspective and can rectify quadrilaterals to rectangles.
Essentials
Interpolation
Nearest, bilinear, bicubic trade quality vs speed when resampling warped coordinates.
Composition
Order of rotation and translation matters; use homogeneous matrices to chain transforms.
Downsampling
Prefilter before shrink to limit aliasing—same Nyquist intuition as sampling theory.
Inverse mapping
For each destination pixel, sample source at inverse-warped location to avoid holes.
Transform hierarchy
Translation ⊂ Rigid ⊂ Similarity ⊂ Affine ⊂ Projective