Patent Document ID: 9213904
Application ID: 14569785
Patent Status: 1

Claim One:
1. A video camera surveillance method comprising the steps of: providing a camera imaging a terrain space in a field of view of the camera, the field of view having a center; acquiring images in a video stream from the camera; forming an image pair of first and second images between two of the images; aligning the first and second images with respect to each other; performing a frame differencing operation on the image pair to form a binary resultant image including blobs corresponding to elements in the terrain space; performing a classification step to classify one of the blobs as an object, the classification step comprising: determining blob pixels of the one of the blobs in the resultant image; dilating the blob pixels in the resultant image to form dilated blob pixels; determining first image blob pixels and second image blob pixels in the first and second images, respectively, which correspond to the blob pixels in the resultant image; determining first image periphery pixels and second image periphery pixels in the first and second images, respectively, which correspond to the dilated blob pixels in the resultant image less the blob pixels in the resultant image; measuring a first divergence between the first image blob pixels and the first image periphery pixels, in the first image; measuring a second divergence between the second blob pixels and the second image periphery pixels, in the second image; and classifying the one of the blobs as the object if the second divergence is greater than the first divergence; selecting the object as a target; tracking the target by moving the camera toward the target; and continually repeating the tracking step as the target moves in the terrain space.