Method and device for determining authenticity of a video

An authenticator system for determining authenticity of a video in a surveillance system, the system comprising circuitry configured to execute:

• a capturing function configured to capture a sequence of image frames of a scene,
• a tracking function configured to track the object in the sequence of image frames,
• a determining function configured to determine a current image quality measure in an image area corresponding to the tracked object in at least a first image frame and a second image frame of the image frames in which the object is tracked, wherein the first and second image frames are chosen such that the object has moved at least a predetermined distance between the first and second image frames,
• an identifying function configured to identify a current image quality measure variation for the object from the determined image quality measure in the first image frame and the second image frame, and
• a comparing function configured to compare the current image quality measure variation to a known image quality measure variation, and
• in response to the current image quality measure variation deviating from the known pixel density variation by less than a first predetermined amount, determining that the video is authentic,
• wherein the image quality measure is at least one from the group consisting of pixel contrast, focus, motion blur, pixel range fill, and noise level.

A camera including an authenticator system for determining authenticity of a video in a surveillance system, the system comprising circuitry configured to execute:

• a capturing function configured to capture a sequence of image frames of a scene,
• a tracking function configured to track the object in the sequence of image frames,
• a determining function configured to determine a current image quality measure in an image area corresponding to the tracked object in at least a first image frame and a second image frame of the image frames in which the object is tracked, wherein the first and second image frames are chosen such that the object has moved at least a predetermined distance between the first and second image frames,
• an identifying function configured to identify a current image quality measure variation for the object from the determined image quality measure in the first image frame and the second image frame, and
• a comparing function configured to compare the current image quality measure variation to a known image quality measure variation, and
• in response to the current image quality measure variation deviating from the known pixel density variation by less than a first predetermined amount, determining that the video is authentic,
• wherein the image quality measure is at least one from the group consisting of pixel contrast, focus, motion blur, pixel range fill, and noise level.

A non-transitory computer readable storage medium having stored thereon instructions for implementing a method, when executed on a device having processing capabilities, for determining authenticity of a video in a surveillance system, the method comprising:

• capturing a sequence of image frames of a scene,
• tracking an object in the sequence of image frames,
• determining a current image quality measure in an image area corresponding to the tracked object in at least a first image frame and a second image frame of the image frames in which the object is tracked, wherein the first and second image frames are chosen such that the object has moved at least a predetermined distance between the first and second image frames,
• identifying a current image quality measure variation for the object from the determined image quality measure in the first image frame and the second image frame, the image quality measure variation describing the image quality measure as a function of position of the object in the first and second image frames,
• comparing the current image quality measure variation to a known image quality measure variation, and
• in response to the current image quality measure variation deviating from the known image quality measure variation by less than a first predetermined amount, determining that the video is authentic,
• wherein the image quality measure is at least one from the group consisting of pixel contrast, focus, motion blur, pixel range fill, and noise level.