Patent ID: 11941863
Assignee: DATALOGIC IP TECH, S.R.L.
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 9:
10. A system for detecting an image of a template object in a captured image, the system comprising:
an imager configured to capture images;
a non-transitory memory in electrical communication with the imager, and configured to store images of objects captured by the imager; and
a processor in electrical communication with the imager and non-transitory memory, and configured to:
compare an image model of an imaged template object to multiple locations, rotations, and scales in the captured image, the image model defined by multiple model base point sets derived from contours of the imaged object, each model base point set inclusive of a plurality of model base points that are positioned at corresponding locations associated with distinctive features of the imaged template object, and each corresponding model base point of the model base point sets (i) being associated with respective layers and (ii) having an associated gradient vector;
determine, based on the comparison of the image model to the multiple locations, rotations, and scales in the captured image, whether and where the image of the object described by the image model is located in the captured image;
compute a multi-layer similarity metric by evaluating, for each model point, a score curve composed by all the scores of each point included in a corresponding base point set;
perform a peak detection of the score curve to identify a best matching layer of the model base point sets; and
filter the score curve using a probabilistic filter to smoothen the score curve prior to performing the peak detection.