http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2018330464-A1
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_ce19e0b95412f68e0a34a42e9b2f30ec |
| classificationCPCAdditional | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G06T2201-0081 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G06T2201-0065 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G06T2201-0052 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G06K9-6206 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G06T1-0064 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G06T3-0006 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G06T3-0056 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G06K9-62 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G06T3-00 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G06T1-00 |
| filingDate | 2018-04-30-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_7bfd8fdd9a4c43f13992dbc3cdd95a02 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_562ced077925b99970850085a93d391c http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_c975074a669e3b73972e4599e13237fd http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_1883a893e8d59ec2bb0aa8aba881e357 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_1f0a735b630481ad00f2cec4ddbc47d4 |
| publicationDate | 2018-11-15-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | US-2018330464-A1 |
| titleOfInvention | Signal Processors and Methods for Estimating Geometric Transformations of Images for Digital Data Extraction |
| abstract | Signal processing devices and methods estimate a geometric transform of an image signal. From a seed set of transform candidates, a direct least squares method applies a seed transform candidate to a reference signal and then measures correlation between the transformed reference signal and an image signal in which the reference signal is encoded. Geometric transform candidates encompass differential scale and shear, which are useful in approximating a perspective transform. For each candidate, update coordinates of reference signal features are identified in the image signal and provided as input to a least squares method to compute an update to the transform candidate. The method iterates so long as the update of the transform provides a better correlation. At the end of the process, the method identifies a geometric transform or set of top transforms based on a further analysis of correlation, as well as other results. Phase characteristics are exploited in the process of updating coordinates and measuring correlation. The geometric transform is used as an approximation of the geometric distortion of an image after digital data is encoded in it, and is used to compensate for this distortion to facilitate extracting embedded digital messages from the image. Due to the errors in the approximation, a signal confidence metric is determined and used to weight message symbol estimates extracted from the image. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-11362833-B2 |
| priorityDate | 2015-07-16-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 43.