Video signature

A system for comparing a video sequence with at least one video signature, the system comprising:

• a storage arrangement to store the at least one video signature;
• a video retrieval module to retrieve the video sequence having a plurality of frames, each of the frames including an image;
• a region definition module to define a plurality of image regions for the image of each of the frames, such that each of the plurality of image regions occupies the same portion of the image for each of the frames;
• a motion analysis module to:
• calculate a plurality of motion vectors, such that one of the motion vectors is calculated for each of the image regions of each of the frames by comparison to the image of another one of the frames, each of the motion vectors having a direction of motion and a magnitude of motion;
• and
• determine a plurality of angles including a set of the angles for each of the frames so that for each one of the frames, the set of the angles being defined by angles between the motion vectors for the one frame and a plurality of connecting vectors connecting the motion vectors of the one frame such that each of the angles is defined by one of the motion vectors and one of the connecting vectors;
• wherein each of the motion vectors has a head and tail, each of the connecting vectors being connected to a tail of one of the motion vectors and a head of another one of the motion vectors;
• and
• a signature comparison module to compare:
• the set of angles for each of the frames with the at least one video signature;
• and the magnitude of motion of the one motion vector for each of the image regions of each of the frames with the at least one video signature.

A method for creating a video signature, comprising:

• retrieving a video sequence having a plurality of frames, each of the frames including an image;
• defining a plurality of image regions for the image of each of the frames, such that each of the plurality of image regions occupies the same portion of the image for each of the frames;
• calculating a plurality of motion vectors, such that one of the motion vectors is calculated for each of the image regions of each of the frames by comparison to the image of another one of the frames, each of the motion vectors having a direction of motion and a magnitude of motion;
• determining a plurality of angles including a set of the angles for each of the frames so that for each one of the frames, the set of the angles being defined angles between the motion vectors for the one frame and a plurality of connecting vectors connecting the motion vectors of the one frame such that each of the angles is defined by one of the motion vectors and one of the connecting vectors;
• wherein each of the motion vectors has a head and tail, each of the connecting vectors being connected to a tail of one of the motion vectors and a head of another one of the motion vectors;
• and
• creating the video signature including:
• data indicative of the direction of motion and the magnitude of motion for each of the image regions of each of the frames;
• and the set of angles for each of the frames.

A method for comparing a video sequence with at least one video signature, the method comprising:

• storing the at least one video signature;
• retrieving the video sequence having a plurality of frames, each of the frames including an image;
• defining a plurality of image regions for the image of each of the frames, such that each of the plurality of image regions occupies the same portion of the image for each of the frames;
• calculating a plurality of motion vectors, such that one of the motion vectors is calculated for each of the image regions of each of the frames by comparison to the image of another one of the frames, each of the motion vectors having a direction of motion and a magnitude of motion;
• determining a plurality of angles including a set of the angles for each of the frames so that for each one of the frames, the set of the angles being defined by angles between the motion vectors for the one frame and a plurality of connecting vectors connecting the motion vectors of the one frame such that each of the angles is defined by one of the motion vectors and one of the connecting vectors;
• wherein each of the motion vectors has a head and tail, each of the connecting vectors being connected to a tail of one of the motion vectors and a head of another one of the motion vectors;
• comparing the set of angles for each of the frames with the at least one video signature;
• and
• comparing the magnitude of motion of the one motion vector for each of the image regions of each of the frames with the at least one video signature.

A system for creating a video signature, comprising:

• means for retrieving a video sequence having a plurality of frames, each of the frames including an image;
• means for defining a plurality of image regions for the image of each of the frames, such that each of the plurality of image regions occupies the same portion of the image for each of the frames;
• means for calculating a plurality of motion vectors, such that one of the motion vectors is calculated for each of the image regions of each of the frames by comparison to the image of another one of the frames, each of the motion vectors having a direction of motion and a magnitude of motion;
• means for determining a plurality of angles including a set of the angles for each of the frames so that for each one of the frames, the set of the angles being defined by angles between the motion vectors for the one frame and a plurality of connecting vectors connecting the motion vectors of the one frame such that each of the angles is defined by one of the motion vectors and one of the connecting vectors;
• wherein each of the motion vectors has a head and tail, each of the connecting vectors being connected to a tail of one of the motion vectors and a head of another one of the motion vectors;
• and
• means for creating the video signature including:
• data indicative of the direction of motion and the magnitude of motion for each of the image regions of each of the frames;
• and the set of angles for each of the frames.

A system for comparing a video sequence with at least one video signature, the system comprising:

• means for storing the at least one video signature;
• means for retrieving the video sequence having a plurality of frames, each of the frames including an image;
• means for defining a plurality of image regions for the image of each of the frames, such that each of the plurality of image regions occupies the same portion of the image for each of the frames;
• means for calculating a plurality of motion vectors, such that one of the motion vectors is calculated for each of the image regions of each of the frames by comparison to the image of another one of the frames, each of the motion vectors having a direction of motion and a magnitude of motion;
• means for determining a plurality of angles including a set of the angles for each of the frames so that for each one of the frames, the set of the angles being defined by angles between the motion vectors for the one frame and a plurality of connecting vectors connecting the motion vectors of the one frame such that each of the angles is defined by one of the motion vectors and one of the connecting vectors;
• wherein each of the motion vectors has a head and tail, each of the connecting vectors being connected to a tail of one of the motion vectors and a head of another one of the motion vectors;
• and
• means for comparing:
• the set of angles for each of the frames with the at least one video signature;
• and the magnitude of motion of the one motion vector for each of the image regions of each of the frames with the at least one video signature.