Alibaba Group Holding Limited

Depin Chen

Zengming Zhang

Ningqing Liang

Guli Lin

Zhiqiang Chen

Feijun Jiang

The present invention provides a method and device for detecting the presence of logo patterns in product images. The method comprises the steps of retrieving one or more logo patterns from a logo pattern library, each of the one or more logo patterns identifying a respective product brand; retrieving a product image; calculating for each of the one or more logo patterns, a matching degree, the matching degree representing a degree to which each logo pattern is present in the product image; selecting as a selected logo pattern, the logo pattern having the greatest calculated matching degree; and determining that the product image includes the selected logo pattern if the matching degree of the selected logo pattern is greater than a first threshold.

System and method for determining whether a product image includes a logo pattern

A method and an apparatus of identifying a website user are disclosed herein. The method includes: obtaining accounts and user identities from a database; building a connected graph by taking the accounts and the user identities as nodes and connecting account nodes and user identity nodes having association relationship therewith; finding a connected component from the connected graph, accounts corresponding to all account nodes in the connected component forming an account group that is bound to a same website user; computing an account density and a fraud account closing rate of the account group; determining whether the account density and the fraud account closing rate are within respective predetermined normal value ranges; and if affirmative, determining that the account group is a dangerous account group and a website user bound to the dangerous account group is a dangerous website user; otherwise, determining that the account group is a normal account group and a website user bound to the normal account group is a normal website user.

Method and apparatus of identifying a website user

Detecting a specific image applicable at a website includes detecting an existence of a frame of the specific image. The specific image applicable at the website is obtained. An edge characteristic value of each pixel of the image is calculated. A pixel whose edge characteristic value is a local maximum value is found along a slope direction of each pixel. When the edge characteristic value of the found pixel is larger than a preset characteristic value threshold, a preset color is used to fill the pixel. The specific image is scanned. An amount of pixels whose color is the preset color at each scanning line of the specific image is counted. When the amount of such pixels at a scanning line is larger than a preset number threshold, a line where the scanning line locates is determined as an edge line of the frame.

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Hangzhou, China

Depin Chen