pincushiondistortion
Pincushion distortion, sometimes simply called pincushion distortion, is a type of radial distortion observed in images produced by lenses. In this form of distortion the magnification increases with distance from the image center, causing straight lines to bow inward toward the center of the frame and the corners to appear pinched. It is the opposite of barrel distortion, where magnification decreases with radius and lines bow outward. Pincushion distortion is commonly associated with telephoto and certain zoom lenses and can be described mathematically by a positive radial distortion coefficient.
Causes and characteristics: Pincushion distortion arises from the optical design and projection geometry of the lens
Measurement and correction: Distortion is typically estimated through camera calibration using images of known patterns (such
Impact and notes: Pincushion distortion can affect architectural or technical photography where straight lines must be