Patent ID: 8320631

Claim:
A movement detection apparatus comprising: a detector configured to detect a level of an input image signal; a setting module configured to set a smoothing level range which corresponds to an amplitude level to remove a noise component overlying the input image signal, based on the level of the input image signal detected by the detector; an arithmetic module configured to calculate a difference signal between the input image signal and an image signal of a previous frame; an edge-storing filter configured to perform smoothing processing for a signal falling within the smoothing level range which is set by the setting module, among difference signals calculated by the arithmetic module; and a determining module configured to compare a level of a signal output from the filter with a determining level whose absolute value is higher than the smoothing level, determine the level of the signal output from the filter as a movement component when the level of the signal output from the filter is higher than the determining level, and determine the level of the signal output from the filter as a noise component when the level of the signal output from the filter is lower than the determining level.