Patent ID: 8180837
Filing Date: 2012-05-15
Classification: G06K,G06Q

Abstract:
1. A computer-implemented method comprising: converting, by an anti-spam module, an embedded image of an electronic mail (email) message to a binarized representation by performing thresholding on a grayscale representation of the embedded image; quantifying, by the anti-spam module, a number of text strings that are included in the embedded image by analyzing one or more blocks of the binarized representation with a text string measurement algorithm; classifying, by the anti-spam module, the email message as spam or clean based at least in part on the number of text strings; wherein the anti-spam module is implemented in one or more processors and one or more non-transitory computer-readable storage media of one or more computer systems, the one or more non-transitory computer-readable storage media having instructions tangibly embodied therein representing the anti-spam module that are executable by the one or more processors; and wherein the one or more blocks comprise M×N virtual blocks and wherein the text string measurement algorithm employs equations having a general form as follows: where, ∂ T is the number of text strings; T CB B