Patent Document ID: 7889794
Application ID: 11346708

Base Claim:
1. A method of analyzing a digital video clip to determine candidate frames for subsequent key frame selection, comprising: a. performing a global motion estimate on the video clip that indicates translation of a scene or camera, or scaling of the scene; b. forming a plurality of video segments based on the global motion estimate and labeling each segment in accordance with a predetermined series of camera motion classes; c. extracting key frame candidates from the labeled segments and computing a confidence score for each candidate by using rules corresponding to each camera motion class and a rule corresponding to object motion; and d. wherein, the rules corresponding to camera motion include extracting a candidate frame for a pan segment with a confidence score related to a translation amount during the pan, and not extracting candidate frames for object motion based frames for fast pan and zoom segments, and the rule corresponding to object motion includes extracting a candidate frame for a fixed segment with a confidence score related to the segment length.

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Claim 2:
2. The method of claim 1 wherein the predetermined camera motion classes include pan (left or right, and tilt up or down), zoom (in or out), fast pan or fixed.