Optical-information recording/reproducing apparatus and optical-information recording/reproducing method
An optical-information recording/reproducing apparatus of the present invention is capable of carrying out position detection of a reproduction image even if reproduction image data with incomplete alignment marks (markers) is obtained. A relative correlation value is calculated from a first correlation value retained by a first correlation-value retaining unit and a second correlation value retained by a second correlation-value retaining unit, and pass/fail of a position detection result of the marker is judged according to the relative correlation value. The pass/fail of the position detection result is judged by mutually comparing the detection positions of the markers judged as passes by the relative correlation-value judgement, the positions of the markers judged as fail by the relative correlation-value judgement or the mutual position judgement is complemented, and the position of two-dimensional data is detected based on the pass-judged markers and the complemented markers.
1. An optical-information recording and reproducing apparatus for recording two-dimensional data in an information recording medium by multiplexing and reproducing the two-dimensional data recorded in the information recording medium by utilizing holography serving as an interference pattern of a signal beam and a reference beam, the optical-information recording and reproducing apparatus comprising:
a marker adding unit configured to dispose two or more markers in the two-dimensional data in a case of recording the two-dimensional data, the markers for carrying out position detection of the two-dimensional data;
a correlation-value calculating unit configured to calculate a plurality of correlation values of a plurality of different partial ranges within the two-dimensional data reproduced in a case of reproducing the two-dimensional data;
a first correlation-value retaining unit configured to retain, for each of the two or more of the markers, a first correlation value among the correlation values calculated by the correlation-value calculating unit;
a second correlation-value retaining unit configured to retain, for each of the two or more of the markers, a second correlation value among the correlation values calculated by the correlation-value calculating unit;
a relative correlation-value judging unit configured to calculate, for each of the two or more of the markers, a relative correlation value from the first correlation value retained by the first correlation-value retaining unit and the second correlation value retained by the second correlation-value retaining unit and judge a pass or a fail of a first position detection result of the respective marker according to the relative correlation value;
a mutual position judging unit configured to mutually compare detected positions of each of the markers judged as passes by the relative correlation-value judging unit and judge a pass or a fail of a second position detection result of each of the respective markers judged as passing by the relative correlation-value judging unit;
a complement processing unit configured to complement a respective position of each of the markers judged as failing by the relative correlation-value judging unit or the mutual position judging unit; and
a position detecting unit configured to detect a position of the two-dimensional data based on each of the markers judged as passing by the relative correlation-value judging unit and judged as passing by the mutual position judging unit and each of the markers complemented by the complement processing unit.
2. The optical-information recording and reproducing apparatus according to claim 1 , wherein the first correlation value is a largest value of the correlation values calculated by the correlation-value calculating unit.
3. The optical-information recording and reproducing apparatus according to claim 1 , wherein the second correlation value is an average value, a median value, or a second largest value of the correlation values calculated by the correlation-value calculating unit.
4. The optical-information recording and reproducing apparatus according to claim 1 , wherein the relative correlation value is a difference or quotient of the first correlation value and the second correlation value.
5. The optical-information recording and reproducing apparatus according to claim 1 , wherein the mutual position judging unit judges the pass or the fail of the second position detection result based on a prescribed position determined in advance for each of the markers and a respective position-detection error amount calculated from a detected position of each of the markers judged as passing by the relative correlation-value judging unit.
6. The optical-information recording and reproducing apparatus according to claim 1 , wherein the complement processing unit complements each of the markers judged as failing based on a detected position of each of the markers judged as passing by the relative correlation-value judging unit.
7. The optical-information recording and reproducing apparatus according to claim 3 , wherein the complement processing unit selects a complementing process of the markers depending on a number of the markers judged as passing by the relative correlation-value judging unit or the mutual position judging unit.
8. The optical-information recording and reproducing apparatus according to claim 1 , wherein the complement processing unit sets a respective position of each of the markers judged as failing at a prescribed position determined in advance.
9. The optical-information recording and reproducing apparatus according to claim 1 , further comprising:
a position-detection-result retaining unit configured to retain positions of each of the markers judged as passing by the relative correlation-value judging unit or the mutual position judging unit and retain positions of each of the markers complemented by the complement processing unit, and
wherein a plurality of pages are grouped as a book, and the hologram corresponds to an angle of the reference beam and a first one of the pages, and
wherein the position detecting unit detects a position of two-dimensional data corresponding to a second one of the pages by using the positions of the markers corresponding to the first one of the pages retained by the position-detection-result retaining unit.
10. An optical-information recording and reproducing method of recording two-dimensional data in an information recording medium by multiplexing and reproducing the two-dimensional data recorded in the information recording medium by utilizing holography serving as an interference pattern of a signal beam and a reference beam, the optical-information recording and reproducing method comprising:
a marker adding step of disposing two or more markers in the two-dimensional data in a case of recording the two-dimensional data, the markers for carrying out position detection of the two-dimensional data;
a correlation-value calculating step of calculating a plurality of correlation values of a plurality of different partial range within the two-dimensional data reproduced in a case of reproducing the two-dimensional data;
a first correlation-value retaining step of retaining, for each of the two or more of the markers, a first correlation value among the calculated correlation values;
a second correlation-value retaining step of retaining, for each of the two or more of the markers, a second correlation value among the calculated correlation values;
a relative correlation-value judging step of calculating, for each of the two or more of the markers, a relative correlation value from the first correlation value retained and the second correlation value retained by the second correlation-value retaining step and judging a pass or a fail of a first position detection result of the respective marker according to the relative correlation value;
a mutual position judging step of mutually comparing detected positions of each of the markers judged as passing by the relative correlation-value judging step and judging a pass or a fail of a second position detection result of each the respective markers judged as passing by the relative correlation-value judging step;
a complement processing step of complementing a respective position of each of the markers judged as failing by the relative correlation-value judging step or the mutual position judging step; and
a position detecting step of detecting a position of the two-dimensional data based on each of the markers judged as passing by the relative correlation-value judging step and judged as passing by the mutual position judging step and each of the markers complemented by the complement processing step.
11. The optical-information recording and reproducing method according to claim 10 , wherein the first correlation value is a largest value of the correlation values calculated by the correlation-value calculating step.
12. The optical-information recording and reproducing method according to claim 10 , wherein the second correlation value is an average value, a median value, or a second largest value of the correlation values calculated by the correlation-value calculating step.
13. The optical-information recording and reproducing method according to claim 10 , wherein the relative correlation value is a difference or quotient of the first correlation value and the second correlation value.
14. The optical-information recording and reproducing method according to claim 10 , wherein, in the mutual position judging step, the second position detection result is judged based on a prescribed position determined in advance for each of the markers and a respective position-detection error amount calculated from a detected position of each of the markers judged as passing by the relative correlation-value judging step.
15. The optical-information recording and reproducing method according to claim 10 , wherein, in the complement processing step, each of the markers judged as failing is complemented based on a detected position of each of the markers judged as passing by the relative correlation-value judging step.
16. The optical-information recording and reproducing method according to claim 12 , wherein, in the complement processing step, a complementing process of the markers is selected depending on a number of the markers judged as passing by the relative correlation-value judging step or the mutual position judging step.
17. The optical-information recording and reproducing method according to claim 10 , wherein the complement processing step sets a respective position of each of the markers judged as failing at a prescribed position determined in advance.
18. The optical-information recording and reproducing method according to claim 10 , further comprising:
a position-detection-result retaining step of retaining positions of each of the markers judged as passing by the relative correlation-value judging step or the mutual position judging step and retaining positions of each of the markers complemented by the complement processing step,
wherein a plurality of pages are grouped as a book, and the hologram corresponds to an angle of the reference beam and a first one of the pages, and
wherein a position of two-dimensional data corresponding to a second one of the pages is detected by using the positions of the markers corresponding to the first one of the pages retained by the position-detection-result retaining step.