Patent Document ID: 9813762
Application ID: 15051137
Patent Status: 1

Claim One:
1. A computer implemented method of hashing an image, comprising: receiving a reference image frame; deriving an array of reference hash values to represent the reference image frame, wherein the array of reference hash values includes a first reference hash value, a second reference hash value, and a third reference hash value; receiving an test image frame; deriving an array of hash values to represent the test image frame, wherein the array of hash values includes a first test hash value, a second test hash value, and a third test hash value; and subtracting the array of test hash values representing the test image frame from the array of reference hash values representing the reference image frame to produce a delta array, wherein the delta array is indicative of an area where the test image frame differs from the reference image frame, wherein the first reference hash value is Hash(Y), the second reference hash value is Hash(U) and the third reference hash value is Hash(V), and the reference array is ref[Hash(Y), Hash(U), Hash(V)] and wherein the first test hash value is Hash(Y), the second test hash value is Hash(U) and the third test hash value is Hash(V), and the test array is test[Hash(Y), Hash(U), Hash(V)], and wherein the delta array is delta[Hash(Y), Hash(U), Hash(V)], and wherein Hash(Y) is determined according to a hash function: Hash(Y)=Σ(w ij *(Y value of a pixel at coordinates (i,j)) wherein w ij is a value represented by (i+j).