Method and system for identifying objects in an image
AssigneeLockheed Martin Corporation
InventorHarry C. Lee
Life of this patent
Estimating the term…
Abstract
Methods and apparatus for identifying objects in an image include processing the image with a gradient operator to produce a gradient magnitude and direction for each pixel. A number of different gradient directions in a portion of the processed image is determined. The portion of the processed image is identified as an object if the number of different gradient directions exceeds a threshold number of gradient directions. The determination of the gradient directions can be simplified by employing a lookup table.
Claims29
A method for identifying objects in an image comprising:
- processing the image with a gradient operator to produce a gradient magnitude and direction for each pixel;
- determining a number of different gradient directions in a portion of the processed image;
- and
- identifying the portion of the processed image as an object if the number of different gradient directions exceeds a threshold number of gradient directions.
A method for identifying objects in an image comprising:
- determining a gradient magnitude for each pixel in the image;
- and
- determining a gradient direction for each pixel in the image, the gradient direction being determined using a look up table.
A computer-readable medium containing a program which executes the steps of:
- processing an image with a gradient operator to produce a gradient magnitude and direction for each pixel;
- determining a number of different gradient directions in a portion of the processed image;
- and
- identifying the portion of the processed image as an object if the number of different gradient directions exceeds a threshold number of gradient directions.
A computer-readable medium containing a program which executes the steps of:
- determining a gradient magnitude for each pixel in an image;
- and
- determining a gradient direction for each pixel in the image, the gradient direction being determined using a look up table.
A system comprising:
- a processor which processes the image with a gradient operator to produce a gradient magnitude and direction for each pixel, determines a number of different gradient directions in a portion of the processed image, and identifies the portion of the processed image as an object if the number of different gradient directions exceeds a threshold number of gradient directions;
- and
- means for outputting the identified portion of the processed image.
Dependencies are inferred from the claim text.