A hybrid method for estimating the Euclidean distance between two vectors

We propose an alternative method for estimating the Euclidean distance between an image block and a codeword. Our method incorporates the reduced code look-up table (RCLUT) method with an RCLUT-like method to allow alternative selection in the encoding phase in vector quantization (VQ). This method can speed up computation for distance estimation. It provides better image quality than the RCLUT method at the cost of extra storage. According to experimental results, our method provides better image quality than the RCLUT method.