Video fingerprint retrieval method based on coarse and fine granularity
A video fingerprint, coarse and fine-grained technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of poor feature sequence robustness, inability to achieve real-time detection, and insufficient time efficiency, and achieve short retrieval time. The effect of balancing retrieval efficiency and retrieval overhead and ensuring retrieval accuracy
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[0034] figure 1 It is a flow chart of the video fingerprint retrieval method based on coarse and fine granularity in the present invention.
[0035] In this example, if figure 1As shown, the present invention is based on the coarse-grained video fingerprint retrieval method, comprises the following steps:
[0036] S1), building a hash function family
[0037] Build the hash function g i (x), i=1, 2, ..., L, then the form of the entire hash function family can be expressed as: g 1 (x), g 2 (x),...,g L (x), wherein, L represents the number of subsets in the entire hash function family;
[0038] Among them, the specific construction method of the hash function is:
[0039] a), define the data space and its mapping: for the input x of the hash function, it is expressed as x={x 1 ,x 2 ,...,x d}, which belongs to the d-dimensional space, and maps the point x of the d-dimensional space P to the d'-dimensional space H d' Another point x' method is:, x'=Unary c (x 1 )Unary...
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