Methods and apparatus to determine the dimensions of a region of interest of a target object from an image using target object landmarks
First Claim
Patent Images
1. 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.
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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.
61 Citations
22 Claims
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1. A method comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An apparatus comprising:
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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. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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21. A tangible computer readable storage medium comprising instructions which, when executed, cause a processor to at least:
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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. - View Dependent Claims (22)
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Specification