Scene-change detection using video stream pairs
AssigneeDolby Laboratories Licensing Corporation
InventorsSeyedalireza Golestaneh, Guan-Ming Su
Life of this patent
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Abstract
A scene change is determined using a first and a second video signal, each representing the same scene or content, but at a different color grade (such as dynamic range). A set of prediction coefficients is generated to generate prediction signals approximating the first signal based on the second signal and a prediction model. A set of prediction error signals is generated based on the prediction signals and the first signal. Then, a scene change is detected based on the characteristics of the prediction error signals. Alternatively, a set of entropy values of the difference signals between the first and second video signals are computed, and a scene change is detected based on the characteristics of the entropy values.
Claims15
A method for scene change detection, the method comprising:
- accessing a first video signal and a second video signal, wherein both the first video signal and the second video signal represent the same video content but at a different color grade;
- for a sequence of consecutive frames in the first and second video signals:
- computing prediction coefficients for a prediction model to generate predicted frames of the first video signal given data of the second video signal;
- computing prediction errors signals between the generated predicted frames and the corresponding frames of the first input signal;
- and
- determining a scene change in the sequence of the consecutive frames based on the prediction error signals, wherein determining a scene change between frames j−1 and j in the sequence of the consecutive frames based on the prediction error signals further comprises computing whether
- Dj−1,j>Dj,j+i
- for i=1, 2, . . . , Ts, where Ts is an integer and Dj,k denotes a prediction error computed for the k-th frame in the first video signal using prediction model coefficients computed with data of the first and second video signals up to the j-th frame.
Dependencies are inferred from the claim text.