Patent ID: 7457471

Claim:
A method of adaptively encoding input image data of a motion image, the method comprising: calculating a temporal complexity of the input image data; converting an original frame rate of the input image data into a converted frame rate based on the calculated temporal complexity; and encoding the input image data whose frame rate has been converted and adjusting encoding data of the encoded input image data so that the encoded input image data has information on the converted frame rate, wherein the information on the converted frame rate is located in a unit of a sequence, a group of pictures, or a picture of the encoded input image data, the encoding data of the encoded input image data comprises a picture coding extension in a data structure of the encoded input image data, and the picture coding extension in a data structure of the encoded input image data comprises at least one of a repeat first field (RFF) value of the picture coding extension and a top field first (TFF) value of the picture coding extension.