Methods and apparatus to determine the dimensions of a region of interest of a target object from an image using target object landmarks
AssigneeThe Nielsen Company (US), LLC
InventorKevin Deng
Life of this patent
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Abstract
Methods and apparatus to determine the dimensions of a region of interest of a target object and a class of the target object from an image using target object landmarks are disclosed herein. An example method includes identifying a landmark of a target object in an image based on a match between the landmark and a template landmark; classifying a target object based on the identified landmark; projecting dimensions of the template landmark based on a location of the landmark in the image; and determining a region of interest based on the projected dimensions, the region of interest corresponding to text printed on the target object.
Claims22
A method comprising:
- identifying, by executing instructions with a processor, a landmark of a target object in an image based on a match between the landmark and a template landmark;
- determining, by executing instructions with the processor, a position and an orientation of the landmark relative to the image;
- projecting, by executing instructions with the processor, dimensions of the template landmark based on the position and the orientation of the landmark in the image by:
- generating, by executing instructions with the processor, a left side search area, the left side search area being a first region including a first edge of the landmark;
- determining, by executing instructions with the processor, a first landmark edge by analyzing first transition points in the left side search area;
- generating, by executing instructions with the processor, a right side search area, the right side search area being a second region including a second edge of the landmark;
- and
- determining, by executing instructions with the processor, a second landmark edge by analyzing second transition points in the right side search area;
- and
- defining, by executing instructions with the processor, a region of interest based on the projected dimensions, the region of interest corresponding to text printed on the target object.
An apparatus comprising:
- a landmark detector to identify a landmark of a target object in an image based on a match between the landmark and a template landmark;
- and
- a corner determiner to:
- determine a position and an orientation of the landmark relative to the image,
- project dimensions of the template landmark based on the position and the orientation of the landmark relative to the image by:
- generating a left side search area, the left side search area being a first region including a first edge of the landmark;
- determining a first landmark edge by analyzing first transition points in the left side search area;
- generating a right side search area, the right side search area being a second region including a second edge of the landmark;
- and
- determining a second landmark edge by analyzing second transition points in the right side search area;
- and
- define a region of interest based on the projected dimensions, the region of interest corresponding to text printed on the target object.
A tangible computer readable storage medium comprising instructions which, when executed, cause a processor to at least:
- identify a landmark of a target object in an image based on a match between the landmark and a template landmark;
- determine a position and an orientation of the landmark relative to the image;
- project dimensions of the template landmark based on the position and the orientation of the landmark relative to the image by:
- generating a left side search area, the left side search area being a first region including a first edge of the landmark;
- determining a first landmark edge by analyzing first transition points in the left side search area;
- generating a right side search area, the right side search area being a second region including a second edge of the landmark;
- and
- determining a second landmark edge by analyzing second transition points in the right side search area;
- and
- define a region of interest based on the projected dimensions, the region of interest corresponding to text printed on the target object.
Dependencies are inferred from the claim text.