Template matching with histogram of gradient orientations

摘要

A system for image processing includes determining edge pixels of a model image using an edge based technique and determining an angular orientation for each the edge pixels of the model image. The system determines a histogram of gradient orientations based upon the angular orientations of the model image. The system determining edge pixels of an input image using an edge based technique and determining an angular orientation for each of the edge pixels of the input image. The system determines a histogram of gradient orientations based upon the angular orientations of the input image. The system compares the histogram of gradient orientations of the model image with the histogram of gradient orientations of the input image to determine candidate locations of an object within the input image.

主权项

1. A method for image processing comprising:
(a) determining edge pixels of a model image using an edge based technique; (b) determining an angular orientation for each said edge pixels of said model image; (c) determining a histogram of gradient orientations based upon said angular orientations of said model image; (d) determining edge pixels of an input image using an edge based technique; (e) determining an angular orientation for each of said edge pixels of said input image; (f) determining a histogram of gradient orientations based upon said angular orientations of said input image; (g) comparing said histogram of gradient orientations of said model image with said histogram of gradient orientations of said input image to determine candidate locations of an object and candidate orientations of said object within said input image, wherein said candidate orientations as a result of said comparing discriminate between candidate orientations that are offset by 180 degrees.