1. A method of detecting a motion from an image provided by a digital video camera, the method comprising: (e1) receiving a predetermined number of image frames; (e2) detecting a motion in the image frames using the temporal edge detection algorithm and variance of pixel values with respect to time; and (d4) when it is determined that a motion has been detected, storing the image; wherein step (e2) comprises: (e20) detecting pixels by finding zero crossings of a Laplacian with respect to time using the predetermined number of image frames, wherein the predetermined number of image frames is classified into two groups such that a first group is f(t 1 ) through f(t 2m−1 ) and a second group is f(t 2 ) through f(t 2m ), and the Laplacian is obtained with respect to time of the two groups; (e22) calculating the variance of pixel values with respect to time using the two groups of the predetermined number of image frames; and (e24) determining whether the variance calculated for each zero crossing pixel of the Laplacian is equal to or greater than a predetermined value, and determining that a detected pixel whose variance is equal to or greater than the predetermined value is a motion pixel.