A distortion that creates an inward bulge effect in a monitor due to non uniform scanning
Compare to " barrel distortion".
Geometric distortion in video pictures in which straight lines take on a concave shape, curving inward from the screen edges between the picture corners. See: Barrel Distortion
A distortion in which straight lines not passing through the center of the image bend inward (toward the center of the image). The curvature becomes more pronounced further from the center. This is the opposite of barrel distortion.
A lens aberration where parallel lines at the edge of the image area appear to bow inwards.
lens aberration causing parallel, straight lines at the edge of the image to curve toward the lens axis.