Position information adding apparatus, position information adding method, and computer program for adding position information and position detection apparatus

1. A position information adding apparatus comprising:

a processor configured to

set a plurality of reference positions for each of a plurality of pictures contained in digitalized video data;

set a first position information adding region at a first position defined based on at least any of the plurality of reference positions and a second position information adding region at a second position different from the first position, for each of the plurality of pictures; and

embed a first moving pattern which includes a cyclic pattern with a first pitch along a first direction and moves along the first direction with a first speed on the pictures in a first temporal period into the first position information adding region and a second moving pattern which includes a cyclic pattern with a second pitch along a second direction and moves along the second direction with a second speed on the pictures in a second temporal period into the second position information adding region.

2. The position information adding apparatus according to claim 1 , wherein the second moving pattern is a pattern which is spatially different from the first moving pattern.

3. The position information adding apparatus according to claim 1 , wherein the second direction is different from the first direction.

4. The position information adding apparatus according to claim 3 , wherein the first moving pattern is a pattern in which a pixel value cyclically changes along the first direction and the second moving pattern is a pattern in which a pixel value cyclically changes along the second direction.

5. The position information adding apparatus according to claim 1 , wherein the processor is further configured to set the second temporal period to be different from the first temporal period.

6. The position information adding apparatus according to claim 1 , wherein the processor is further configured to embed digital watermark information in a region on each of the pictures, the region being determined based on at least two of the plurality of reference positions.

7. A position information adding method comprising:

setting a plurality of reference positions for each of a plurality of pictures contained in digitalized video data by a processor;

setting a first position information adding region at a first position defined based on at least any of the plurality of reference positions and a second position information adding region at a second position different from the first position, for each of the plurality of pictures by the processor;

embedding a first moving pattern which includes a cyclic pattern with a first pitch along a first direction and moves along the first direction with a first speed on the pictures in a first temporal period into the first position information adding region by the processor; and

embedding a second moving pattern which includes a cyclic pattern with a second pitch along a second direction and moves along the second direction with a second speed on the pictures in a second temporal period into the second position information adding region by the processor.

8. The position information adding method according to claim 7 , wherein the second moving pattern is a pattern which is spatially different from the first moving pattern.

9. The position information adding method according to claim 7 , wherein the second direction is different from the first direction.

10. The position information adding method according to claim 9 , wherein the first moving pattern is a pattern in which a pixel value cyclically changes along the first direction and the second moving pattern is a pattern in which a pixel value cyclically changes along the second direction.

11. The position information adding method according to claim 7 , wherein the embedding the second moving pattern sets the second temporal period to be different from the first temporal period.

12. The position information adding method according to claim 7 , further comprising:

embedding digital watermark information in a region on each of the pictures, the region being determined based on at least two of the plurality of reference positions.

13. A non-transitory recording medium for recording a computer program which causes a computer to execute:

setting a plurality of reference positions for each of a plurality of pictures contained in digitalized video data;

setting a first position information adding region at a first position defined based on at least any of the plurality of reference positions and a second position information adding region at a second position different from the first position, for each of the plurality of pictures;

embedding a first moving pattern which includes a cyclic pattern with a first pitch along a first direction and moves along the first direction with a first speed on the pictures in a first temporal period into the first position information adding region; and

embedding a second moving pattern which includes a cyclic pattern with a second pitch along a second direction and moves along the second direction with a second speed on the pictures in a second temporal period into the second position information adding region.