Survey of image spam filtering technology

The status of the image spam is described,then the image spam is analyzed,and the difference of image spam is contrasted to the text spam.The feature of the image spam is summarized.At the same time,the common technology methods of image spam filtering are introduced such as OCR(optical character recognition) and dactylogram technology,their advantages and disadvantages are analyzed,and some constructive ideas based on their disadvantages are given.Last it introduces the lastest research production of image spam filtering compendiaryly and gives a expectation for the development of the spam.