Patent ID: 8275032

Claim:
A distributed video coding apparatus capable of controlling an encoding rate, the apparatus comprising: an intra-frame encoder configured to encode a key frame and output a bit stream of the encoded key frame; an encoder rate control (ERC) module configured to calculate a bit rate according to motion complexity of a present Wyner-Ziv (WZ) frame by using a correlation between the motion complexity and the bit rate; and a turbo encoder configured to encode the present WZ frame by the bit rate calculated at the ERC module and output a WZ bit stream, wherein the motion complexity of the present WZ frame is calculated as follows: β 2 ⁢ i = 1 m × n ⁢ ( ∑ k = 1 m ⁢ ⁢ ∑ l = 1 n ⁢ ⁢  I 2 ⁢ i - 1 ⁡ ( k , l ) - X 2 ⁢ i ⁡ ( k , l )  ) wherein β 2i indicates the motion complexity of the present WZ frame X 2i , m×n indicates a size of an image, I 2i−1 indicates a previous key frame, X 2i indicates the present WZ frame, and (k, 1) indicates pixel coordinates.