Employing Pixel Density to Detect a Spam Image. Wei, K., Zheng, H., & Pujara, J. 2011.
bibtex   
@patent{wei:patent11,
    author = "Wei, Ke and Zheng, Hao and Pujara, Jay",
    number = "7882177",
    sec = "patent",
    title = "Employing Pixel Density to Detect a Spam Image",
    year = "2011"
}

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