Encoding apparatus, encoding method and program

An encoding method which encodes picture data obtained by decoding the encoded data, comprising:

• a decision step of deciding, based on a motion vector of the encoded data obtained by decoding, whether a motion vector is generated or not in the encoding of the picture data;
• a motion vector generating step of generating a motion vector based on the picture data provided that the decision step decides to generate the motion vector;
• and
• a motion prediction/compensation step of generating prediction picture data using the motion vector generated by the motion vector generating means when the decision step decides to calculate the motion vector, and generating the prediction picture data using the motion vector obtained by decoding when the decision means decides not to calculate the motion vector.

A encoding apparatus which encodes picture data obtained by decoding the encoded data, comprising:

• a decision unit configured to decide, based on a motion vector of the encoded data obtained by decoding, whether a motion vector is generated or not in the encoding of the picture data;
• a motion vector generating unit configured to generate a motion vector based on the picture data provided that the decision unit decides to generate the motion vector;
• and
• a motion prediction/compensation unit configured to generate prediction picture data using the motion vector generated by the motion vector generating unit when the decision unit decides to calculate the motion vector, and generating the prediction picture data using the motion vector obtained by decoding when the decision unit decides not to calculate the motion vector.