Patent ID: 8144782

Claim:
An adaptive motion estimation method for illumination change, the method comprising: generating the current frame pattern block of a current frame block and the reference frame pattern block of a reference frame block; calculating the Sum of Absolute Difference (SAD) of candidate pattern blocks corresponding to the current frame pattern block among the reference frame pattern blocks and determining a candidate pattern block corresponding to the SAD that meets to predetermined condition among the calculated SADs as a macro block mode and a motion vector; generating a residual signal by using a candidate pattern block corresponding to the motion vector and a different signal of the current frame pattern block, performing the discrete cosine transform (DCT) and the quantization of the residual signal in accordance with a predetermined coding mode, and coding the current frame block; and attaching sign information and a coded absolute difference to header information corresponding to the coded current frame block if the macro block mode comprises a 16×16 size, whereas the sign information refers to a sign of the difference between the pixel mean of the current frame block and the pixel mean of the reference frame block, and the coded absolute difference refers to the absolute difference between the pixel mean of the current frame block and the pixel mean of the reference frame block.