US Patent 10332243 Tampering detection for digital images

A computing system for tampering detection for digital images is disclosed. The computing system uses a LTI filter to filter time series data representing images in one or both of two videos and/or a still image of a live photo captured by a camera. A causal relationship in time existed between the images in the two videos and the still image when they were captured by the camera. The computing system determines whether the filtered output data representing an image by using the LTI filter is causal. If the computing system determines that the filtered output data representing the image is non-causal, it asserts a signal indicating that the image has been modified after it was captured.