Apparatus and method for motion estimation of isolated objects

An apparatus for motion estimation of isolated objects, comprising:

• a dividing circuit, configured to divide each of a first image and a second image into a plurality of blocks, wherein the first image and the second image are images of two consecutive frames;
• a flag circuit, coupled to the dividing circuit, configured to add a flag to each block within the blocks having image information different from background information to find one or more isolated objects via searching for consecutively adjacent flags;
• an analyzing circuit, coupled to the flag circuit, configured to analyze continuity of the flag in the first image and the second image to find a target isolated object having a size less than or equal to a predetermined size from the one or more isolated objects, wherein when a number of consecutively adjacent flags corresponding to a specific isolated object within the one or more isolated objects is greater than a predetermined number, the analyzing circuit discards the specific isolated object;
• a calculating circuit, coupled to the analyzing circuit, configured to obtain an initial motion vector of the target isolated object according to locations of the target isolated object in the first image and the second image;
• and
• a determination circuit, coupled to the calculating circuit, configured to determine whether the initial motion vector is correct according to a sum of absolute differences (SAD) corresponding to the initial motion vector.