Patent ID: 7606444

Claim:
A computer-implemented method for retrieving portions of multimedia information comprising: presenting portions of said multimedia information in a first window graphic, said portions arranged according to a temporal sequence of occurrence in said multimedia information; producing a plurality of video scores based on video data contained in said multimedia information, said video scores corresponding to portions of said video data; presenting a second window graphic within which video data can be presented; presenting a visual representation of said video scores; and detecting a selection of one or more video scores and in response thereto selecting segments of said video data corresponding to said one or more video scores and presenting said segments of said video data in said second window graphic, wherein said video data is representative of doughnut-shaped images, said video score being computed from: V a = max ⁢ { ∑ n = - L / 2 L / 2 ⁢ ⁢ ∑ m = - L / 2 L / 2 ⁢ ⁢ ( ω ⁢ ⁢ ( ( x + n ) 2 + ( y + m ) 2 ) ⁢ ⁢ A x + n , y + m ) } , ⁢ ∀ x = [ - W / 2 + L / 2 ⁢ ⁢ … ⁢ ⁢ W / 2 - L / 2 ] , ∀ y = [ - H / 2 + L / 2 ⁢ ⁢ … ⁢ ⁢ H / 2 - L / 2 ] . , where W and H are a width and a height of said first video frame, L is a subframe size, ω(r) is a weight of a unit pixel block at location r (in polar coordinates) A ij is a luminance difference between two of said unit pixel blocks at location (i×M, j×N) respectively in each of two consecutive frames of video and a pixel area is M×N.