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    • 8. 发明授权
    • Non-parametric measurement of media fingerprint weak bits
    • 介质指纹弱位的非参数测量
    • US08316011B2
    • 2012-11-20
    • US13173462
    • 2011-06-30
    • Junfeng HeRegunathan RadhakrishnanWenyu Jiang
    • Junfeng HeRegunathan RadhakrishnanWenyu Jiang
    • G06F7/00G06F17/30
    • G06F17/30023
    • A value is computed for a feature in an instance of query content and compared to a threshold value. Based on the comparison, first and second bits in a hash value, which is derived from the query content feature, are determined. Conditional probability values are computed for the likelihood that quantized values of the first and the second bits equal corresponding quantized bit values of a target or reference feature value. The conditional probabilities are compared and a relative strength determined for the first and second bits, which directly corresponds to the conditional probability. The bit with the lowest bit strength is selected as the weakbit. The value of the weakbit is toggled to generate a variation of the query hash value. The query may be extended using the query hash value variation.
    • 为查询内容的实例中的要素计算一个值,并与阈值进行比较。 基于比较,确定从查询内容特征导出的哈希值中的第一和第二比特。 对于第一和第二比特的量化值等于目标或参考特征值的相应量化比特值的可能性,计算条件概率值。 比较条件概率,并确定第一和第二位的相对强度,其直接对应于条件概率。 选择具有最低位强度的位作为弱位。 切换弱点的值以生成查询哈希值的变体。 可以使用查询哈希值变化来扩展查询。