Method for detecting camera-motion induced scene changes
AssigneeLucent Technologies Inc.
InventorBehzad Shahraray
Life of this patent
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Abstract
A method for determining camera-induced scene changes in a sequence of visual information-bearing frames which constitute a single shot first determines camera-induced motion between each of a plurality of pairs frames within a single camera shot. The camera-induced motion for each of the pairs of frames is decomposed into at least a first component. The values of the first component for each of the pairs of frames are summed to form a first cumulative signal. A scene change is indicated when the first cumulative signal meets a certain decision criteria.
Claims22
A method of determining whether a scene change in a sequence of visual information-bearing frames comprising content is a shot boundary scene change at a shot boundary between two successive shots or a camera-induced motion scene change at a point within a shot where the content changes considerably as a result of camera-induced motion, said method comprising the steps of:
- (a) responsive to a shot boundary between two successive shots, generating a shot boundary scene change indicator signal to indicate a scene change between the two successive shots;
- (b) responsive to camera-induced motion within a particular shot of the two successive shots, generating a first signal representing camera-induced motion between each of a plurality of pairs of frames within said sequence of visual information-bearing frames within the particular shot;
- (c) decomposing the camera-induced motion represented by the first signal for the plurality of pairs of frames into at least a first component signal;
- (d) summing the values of the first component signal for each of the pairs of frames to form a first cumulative signal;
- and
- (e) generating a camera-induced motion scene change indicator signal to indicate a scene change within the particular shot of the successive shots when the first cumulative signal meets a predetermined decision criterion,
- wherein the particular shot comprises a plurality of consecutive frames generated during a continuous time interval by a single camera.
A method of determining whether a scene change in a sequence of visual information-bearing frames comprising content is a shot boundary scene change at a shot boundary between two successive shots or a camera-induced scene change at a point within a shot where the content changes considerably as a result of camera-induced motion, said method comprising the steps of:
- (a) responsive to a shot boundary between two successive shots, generating a shot boundary scene change indicator signal;
- (b) responsive to the occurrence of any camera-induced motion within a particular shot of the successive shots defined by the shot boundary, generating a signal representing the camera-induced motion between each of a plurality of pairs of frames within said sequence of visual information-bearing frames within the particular shot;
- (c) decomposing the camera-induced motion represented by the first signal for the plurality of pairs of frames into components representing values of image pan, image tilt, and image zoom to form an image pan signal, an image tilt signal, and an image zoom signal, respectively;
- (d) summing each of the image pan, image tilt, and image zoom signals to form a cumulative pan signal, a cumulative tilt signal, and a cumulative zoom signal, respectively;
- and
- (e) generating a camera-induced motion scene change indicator to indicate a scene change within one of the successive shots when at least one of the cumulative signals meet a predetermined decision criterion,
- wherein the particular shot comprises a plurality of consecutive frames generated during a continuous time interval by a single camera.
A method of determining camera-induced scene changes in a sequence of visual information-bearing frames comprising content, said method comprising the steps of:
- (a) determining at least two camera shots within said visual information-bearing frames, each respective shot comprising a plurality of consecutive frames generated during a continuous time interval by a single camera;
- and
- for at least one of said camera shots,
- (b) generating a signal representing a considerable change in the content as a result of camera-induced motion between each of a plurality of pairs of frames within said at least one camera shot;
- (c) summing a plurality of the signals generated for a respective plurality of pairs of frames to form a first cumulative signal;
- and
- (d) generating an indicator signal that indicates a camera-induced scene change when the first cumulative signal meets a predetermined decision criterion.
A method of determining whether a scene change is a shot boundary scene change or a camera-induced motion scene change in a sequence of visual information-bearing frames, said method comprising the steps of:
- (a) responsive to a shot boundary between two successive shots, generating a shot boundary scene change indicator signal to indicate a scene change between the two successive shots;
- (b) responsive to camera-induced motion, generating a first signal representing camera-induced motion between each of a plurality of pairs of frames within said sequence of visual information-bearing frames;
- (c) decomposing the camera-induced motion represented by the first signal for the plurality of pairs of frames into at least a first component signal;
- (d) summing the values of the first component signal for each of the pairs of frames to form a first cumulative signal;
- (e) generating a camera-induced motion scene change indicator signal to indicate a scene change within one of the successive shots when the first cumulative signal meets a predetermined decision criterion;
- (f) repeating steps (b) through (e) until all camera-induced motion scene changes within the sequence of visual information-bearing frames have been indicated, wherein the step of summing the values of the first component signal to form the first cumulative signal comprises the step of summing only those values of the first component signal that have been determined since the immediately preceding camera-induced motion scene change;
- and
- (g) repeating steps (a)-(f) until all shot boundary scene changes and camera-induced motion scene changes within the sequence of visual information-bearing frames have been indicated.
A method of determining whether a scene change is a shot boundary scene change or a camera-induced motion scene change in a sequence of visual information-bearing frames, said method comprising the steps of:
- (a) responsive to a shot boundary between two successive shots, generating a shot boundary scene change indicator signal to indicate a scene change between the two successive shots;
- (b) responsive to camera-induced motion, generating a first signal representing camera-induced motion between each of a plurality of pairs of frames within said sequence of visual information-bearing frames;
- (c) decomposing the camera-induced motion represented by the first signal for the plurality of pairs of frames into at least a first component signal;
- (d) summing the values of the first component signal for each of the pairs of frames to form a first cumulative signal;
- (e) generating a camera-induced motion scene change indicator signal to indicate a scene change within one of the successive shots when the first cumulative signal meets a predetermined decision criterion;
- (f) repeating step (a) until all shot boundary scene changes within the sequence of visual information-bearing frames have been indicated before proceeding to step (b).
A method of determining whether a scene change is a shot boundary scene change or a camera-induced motion scene change in a sequence of visual information-bearing frames, said method comprising the steps of:
- (a) responsive to a shot boundary between two successive shots, generating a shot boundary scene change indicator signal to indicate a scene change between the two successive shots;
- (b) responsive to camera-induced motion, generating a first signal representing camera-induced motion between each of a plurality of pairs of frames within said sequence of visual information-bearing frames;
- (c) decomposing the camera-induced motion represented by the first signal for the plurality of pairs of frames into at least a first component signal;
- (d) summing the values of the first component signal for each of the pairs of frames to form a first cumulative signal;
- (e) generating a camera-induced motion scene change indicator signal to indicate a scene change within one of the successive shots when the first cumulative signal meets a predetermined decision criterion;
- (f) repeating steps (b) through (e) until a plurality of camera-induced motion scene changes within the sequence of visual information-bearing frames have been indicated, wherein the step of summing the values of the first component signal to form the first cumulative signal comprises the step of summing only those values of the first component signal that have been determined since the immediately preceding camera-induced motion scene change;
- and
- (g) repeating steps (a)-(f) until a plurality of shot boundary scene changes and camera-induced motion scene changes within the sequence of visual information-bearing frames have been indicated.
A method of determining whether a scene change is a shot boundary scene change or a camera-induced motion scene change in a sequence of visual information-bearing frames, said method comprising the steps of:
- (a) responsive to a shot boundary between two successive shots, generating a shot boundary scene change indicator signal to indicate a scene change between the two successive shots;
- (b) responsive to camera-induced motion, generating a first signal representing camera-induced motion between each of a plurality of pairs of frames within said sequence of visual information-bearing frames;
- (c) decomposing the camera-induced motion represented by the first signal for the plurality of pairs of frames into at least a first component signal;
- (d) summing the values of the first component signal for each of the pairs of frames to form a first cumulative signal;
- (e) generating a camera-induced motion scene change indicator signal to indicate a scene change within one of the successive shots when the first cumulative signal meets a predetermined decision criterion;
- (f) repeating step (a) until a plurality of shot boundary scene changes within the sequence of visual information-bearing frames have been indicated before proceeding to step (b).
Dependencies are inferred from the claim text.