Patent attributes
Methods and apparatus to detect differences between images are disclosed. Example methods disclosed herein include determining whether a difference between a block of pixels of a first image represented by a first signature and a block of pixels of a reference image represented by a second signature matching the first signature is resolvable using a transformation operation. Example methods disclosed herein also include, in response to determining the difference is unresolvable using the transformation operation, including the block of pixels of the first image in a difference region of the first image. Example methods disclosed herein further include generating a third signature different from the difference region of the first image to represent the difference region of the first image, and storing the third signature with version information associated with first image.
