Patent ID: 8330818

Claim:
An image-based vehicle maneuvering assistant method, comprising the steps of: obtaining a first image relating to a surrounding environment of a carrier at a first time point, by an image sensing device; selecting a datum area from the first image; obtaining a second image relating to the surrounding environment of the carrier at a second time point, by the image sensing device; performing a search in the second image for locating a comparison area in the second image that corresponds to the datum area in the first image so as to acquire a motion vector measure between the comparison area and the datum area, by a controller; and determining a moving trajectory of the carrier according to the motion vector, by the controller, wherein the search in the second image for locating the comparison area that corresponds to the datum area comprises the steps of: calculating a first characteristic value relating to the datum area; and comparing every area in the second image with the datum area with regard to the first characteristic value to search and select an area whose sum of absolute differences (SAD) is the smallest to be used as the comparison area; wherein the searching of the area whose SAD is the smallest to be used as the comparison area comprises the steps of: (a) designating an area in the second image to be a detection area; (b) calculating the SAD between a second characteristic value of the detection area with the first characteristic value; (c) designating another area in the second image to be a detection area; (d) repeating the step (b) to step (c) so as to obtain a plurality of SADs accordingly; and (e) selecting the minimum from the plural SADs; and wherein the calculating of the SAD is proceeded by the following formula: SAD i ( p,q )=Σ X,YεA i |I ( t− 1, X,Y )− I ( t,X+p,Y+q )|, while the minimum of the plural SADs is selected according to the following formula: min p,q SAD i ( p,q ).