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    • 4. 发明授权
    • Digital watermarking with spatiotemporal masking
    • 数字水印与时空掩蔽
    • US08189858B2
    • 2012-05-29
    • US12430354
    • 2009-04-27
    • Jeffrey Lubin
    • Jeffrey Lubin
    • G06K9/00H04N7/167
    • G06T1/0021
    • Visually imperceptible distortion, from watermarking or compression, desired for embedding into frames of a video sequence is computed. Within each spatiotemporal region of the frames, points are counted, which have feature information amplitude that at least equals the desired distortion. In each region, a fraction of the points with magnitudes at least equal to desired distortion is determined, in relation to the total number of points and compared to a threshold. Regions with fractions at least equal to the threshold are identified. Visual aspects of features in the identified regions are analyzed for salience related to drawing visual attention. The salience is compared to a threshold. Identified regions that do not exceed the salience threshold may be selected as candidates for hiding the watermark. Spatial and temporal contrast values may relate to the salience, as well as luminance values computed therewith.
    • 计算视觉上不可察觉的失真,从嵌入到视频序列的帧中所需的水印或压缩。 在帧的每个时空区域内,对点进行计数,其具有至少等于期望失真的特征信息幅度。 在每个区域中,相对于总点数并且与阈值进行比较,确定具有至少等于期望失真的大小的点的一部分。 识别具有至少等于阈值的分数的区域。 对所识别的区域的特征的视觉方面进行分析,以了解与绘制视觉注意相关的显着性。 将显着性与阈值进行比较。 可以选择不超过突出阈值的识别区域作为用于隐藏水印的候选。 空间和时间对比度值可能与显着性以及由此计算的亮度值有关。
    • 5. 发明申请
    • DIGITAL WATERMARKING WITH SPATIOTEMPORAL MASKING
    • 数字水印与空间显示
    • US20090208008A1
    • 2009-08-20
    • US12430354
    • 2009-04-27
    • Jeffrey Lubin
    • Jeffrey Lubin
    • H04N7/167
    • G06T1/0021
    • Visually imperceptible distortion, from watermarking or compression, desired for embedding into frames of a video sequence is computed. Within each spatiotemporal region of the frames, points are counted, which have feature information amplitude that at least equals the desired distortion. In each region, a fraction of the points with magnitudes at least equal to desired distortion is determined, in relation to the total number of points and compared to a threshold. Regions with fractions at least equal to the threshold are identified. Visual aspects of features in the identified regions are analyzed for salience related to drawing visual attention. The salience is compared to a threshold. Identified regions that do not exceed the salience threshold may be selected as candidates for hiding the watermark. Spatial and temporal contrast values may relate to the salience, as well as luminance values computed therewith.
    • 计算视觉上不可察觉的失真,从嵌入到视频序列的帧中所需的水印或压缩。 在帧的每个时空区域内,对点进行计数,其具有至少等于期望失真的特征信息幅度。 在每个区域中,相对于总点数并且与阈值进行比较,确定具有至少等于期望失真的大小的点的一部分。 识别具有至少等于阈值的分数的区域。 对所识别的区域的特征的视觉方面进行分析,以了解与绘制视觉注意相关的显着性。 将显着性与阈值进行比较。 可以选择不超过突出阈值的识别区域作为用于隐藏水印的候选。 空间和时间对比度值可能与显着性以及由此计算的亮度值有关。