Geometric pattern matching using dynamic feature combinations

A memory medium comprising program instructions for detecting patterns in an image, wherein the program instructions are executable to implement:

• in a learning phase,
• storing a template image in a memory medium;
• +P2
• determining a plurality of geometric features present in the template image;
• creating a model for each of a plurality of respective parent features, wherein each model comprises a relationship tree from the respective parent feature to one or more other child features;
• in a matching phase,
• a) receiving a target image;
• b) extracting first geometric features from the target image that correspond to a first parent feature in a first model;
• c) matching the first parent feature to the first geometric features from the target image to determine a first one or more matches;
• d) extracting second geometric features from the target image that correspond to at least one child feature in the first model;
• e) matching the at least one child feature to the second geometric features from the target image;
• f) updating any of the first one or more matches in response to matching the at least one child feature to the second geometric features from the target image;
• (g) performing b)-f) for each of a plurality of models;
• and
• storing information regarding one or more matches in the target image.