Method and apparatus for coding and decoding image data with synchronized sound data

1. An image decoding method comprising:

acquiring a coded data stream comprising key frames, corresponding point data for the key frames, and sound data related to the key frames;

separating the key frames, corresponding point data, and sound data from the coded data stream;

reproducing a motion picture based on the key frames and the corresponding point data by outputting the key frames and intermediate frames generated by interpolation of the key frames using the corresponding point data; and

outputting the sound data based on the number of intermediate frames synchronously with the motion picture.

2. An image decoding method according to claim 1 , wherein the corresponding point data are acquired based on critical points of the key frames.

3. An image decoding method according to claim 1 , wherein the corresponding point data are described by the correspondence of pixels between key frames.

4. An image decoding apparatus comprising:

a first function block for acquiring a coded data stream of a motion picture;

a second function block for acquiring key frames, corresponding point data between key frames, and sound data from the coded data stream;

a third function block for generating intermediate frames based on the key frames and the corresponding point data;

a fourth function block for outputting the key frames and the intermediate frames as a motion picture; and

a fifth function block for outputting the sound data at an output timing based on the number of intermediate frames to provide synchronization with the motion picture.

5. An image decoding apparatus according to claim 4 , wherein the corresponding point data are acquired based on critical points of the key frames.

6. An image decoding apparatus according to claim 4 , wherein the corresponding point data are represented by corresponding pixels between the key frames.

7. An image decoding apparatus according to claim 4 , wherein the third function block is also for receiving an instruction regarding the number of intermediate frames to be generated from an external source.

8. An image decoding apparatus according to claim 4 , wherein the corresponding point data and the sound data are stored collectively as a correspondence information file and wherein the second function block acquires the corresponding point data and the sound data from the correspondence information file.

9. An image decoding method comprising:

acquiring a coded data stream comprising key frames, corresponding point data for the key frames, and sound data;

separating the key frames, corresponding point data, and sound data from the coded data stream;

generating a predetermined number of intermediate frames between key frames based on the key frames and the corresponding point data;

outputting the key frames and intermediate frames to a display device at a predetermined rate;

outputting the sound data to a speaker based on the number of intermediate frames such that said sound data is output synchronously with the output frames.

10. An image decoding method according to claim 9 , wherein the generating of intermediate frames is by interpolation of the key frames using the corresponding point data.

11. An image decoding method according to claim 9 , wherein the predetermined number of intermediate frames generated is set by user input.

12. An image decoding method according to claim 11 , wherein user input comprises a user selection of one of play, fast forward or slow motion.

13. An image decoding method according to claim 9 , wherein the outputting the sound data based on the number of intermediate frames comprises varying the frequency of the sound data based on the number of intermediate frames.

14. An image decoding method according to claim 9 , wherein the predetermined rate is between approximately 1 and 120 frames per second.