Detecting embedded signals in media content using coincidence metrics
View Patent ↗A method of detecting an embedded signal in a media signal. The method comprises receiving blocks of the media signal and computing a detection metric for the blocks. The detection metric comprises a measure of coincidence of detection parameters of different blocks. The method performs subsequent detection operations based on the measure of coincidence of the detection parameters.
1. A method of detecting an embedded signal in a media signal, the method comprising:
receiving blocks of the media signal;
using a programmed processor to compute a detection metric for the blocks, the detection metric comprises a measure of coincidence of detection parameters of different blocks; and
using a programmed processor to perform subsequent detection operations based on the measure of coincidence of the detection parameters.
2. The method of claim 1 wherein the detection parameters include synchronization parameters.
3. The method of claim 2 wherein the synchronization parameters comprises geometric registration parameters.
4. The method of claim 1 wherein the subsequent detection operations include selecting blocks from which to detect the embedded signal.
5. The method of claim 4 wherein selecting blocks further comprises ranking blocks based on the detection metric.
6. The method of claim 1 wherein subsequent detection operations includes combining information from selected blocks and detecting the embedded signal from the combined information.
7. The method of claim 1 wherein subsequent detection operations includes selecting blocks based on the detection metric, extracting the embedded signal from the selected blocks, and comparing results of extracting the embedded signal from the selected blocks as second detection metric.
8. A computer readable medium on which is stored instructions, which when executed by a computer, perform a method of detecting an embedded signal in a media signal, the method comprising:
receiving blocks of the media signal;
computing a detection metric for the blocks, the detection metric comprises a measure of coincidence of detection parameters of different blocks; and
performing subsequent detection operations based on the measure of coincidence of the detection parameters.
9. A device for detecting an embedded signal in a media signal, the device comprising:
a memory for storing blocks of the media signal;
a processor in communication with the memory for computing a detection metric for the blocks, the detection metric comprises a measure of coincidence of detection parameters of different blocks; and the processor configured to perform subsequent detection operations based on the measure of coincidence of the detection parameters.
10. The device of claim 9 wherein the detection parameters include synchronization parameters.
11. The device of claim 10 wherein the synchronization parameters comprises geometric registration parameters.
12. The device of claim 9 wherein the subsequent detection operations include selecting blocks from which to detect the embedded signal.
13. The device of claim 12 wherein selecting blocks further comprises ranking blocks based on the detection metric.
14. The device of claim 9 wherein subsequent detection operations includes combining information from selected blocks and detecting the embedded signal from the combined information.
15. The device of claim 9 wherein subsequent detection operations includes selecting blocks based on the detection metric, extracting the embedded signal from the selected blocks, and comparing results of extracting the embedded signal from the selected blocks as second detection metric.