Lens distortion and camera calibration
WHAT IT TESTS: camera-model fundamentals. OUTLINE: radial distortion bends straight lines (barrel/pincushion), tangential comes from lens-sensor misalignment; calibrate with a known pattern to estimate intrinsics and distortion coefficients.
WHAT IT TESTS: whether you know the pinhole model and how to recover its parameters. ANSWER OUTLINE: radial distortion, modeled by coefficients, curves straight lines outward (barrel) or inward (pincushion) and worsens toward edges; tangential distortion arises when the lens is not parallel to the sensor. To calibrate, capture many views of a known pattern like a checkerboard, detect corners, solve for intrinsic matrix and distortion coefficients, then build an undistortion remap. RED FLAG: omitting intrinsics or assuming one image suffices.
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- #camera-calibration
- #lens-distortion
- #intrinsics
- #undistortion
- #pinhole-model
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