| Predicate |
Object |
| assignee |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_d7d6abde59b81d7ff7360156b9da361c |
| classificationCPCAdditional |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/H04N2201-3233
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/H04N2201-327 |
| classificationCPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/H04N1-3216
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/H04N1-3232
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/H04N1-00074
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/H04N1-32154
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/H04N1-32267
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/H04N1-00005
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/H04N1-00037
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G06T1-00
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G06T1-0064 |
| classificationIPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/H04N1-387
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/H04N1-32
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G06T1-00 |
| filingDate |
2001-02-19-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate |
2003-04-21-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_b3319213850211c57f4268474150bb77
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_0d96480f08daf7fb0dc1ca5fac3c9046
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_3c05b4258e90580df81aa78e2ed2a4d3
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_3d52c2c645d412cda5c74c9a5cd6eeed
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_e96009d155f5144bba101c237725a404 |
| publicationDate |
2003-04-21-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber |
TW-529256-B |
| titleOfInvention |
Rotation, scale, and translation resilient public watermarking for images |
| abstract |
A method for detecting a watermark signal in digital image data. The detecting method includes the steps of: computing a log-polar Fourier transform of the image data to obtain a log-polar Fourier spectrum; projecting the log-polar Fourier spectrum down to a lower dimensional space to obtain an extracted signal; comparing the extracted signal to a target watermark signal; and declaring the presence or absence of the target watermark signal in the image data based on the comparison. Also provided is a method for inserting a watermark signal in digital image data to obtain a watermarked image. The inserting method includes the steps of: computing a log-polar Fourier transform of the image data to obtain a log-polar Fourier spectrum; projecting the log-polar Fourier spectrum down to a lower dimensional space to obtain an extracted signal; modifying the extracted signal such that it is similar to a target watermark; performing a one-to-many mapping of the modified signal back to log-polar Fourier transform space to obtain a set of watermarked coefficients; and performing an inverse log-polar Fourier transform on the set of watermarked coefficients to obtain a watermarked image. |
| isCitedBy |
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-106537453-A |
| priorityDate |
2000-01-21-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type |
http://data.epo.org/linked-data/def/patent/Publication |