Advanced New Technologies Co., Ltd.

Alibaba Group Holding Limited

Advantageous New Technologies Co., Ltd.

Yinhai Tu

Huan Liu

Wenrong Liu

Disclosed herein are methods, systems, and apparatus, including computer programs encoded on computer storage media, for identifying a narrow-strip two-dimensional bar code. One of the methods includes obtaining an image of the narrow-strip two-dimensional bar code. A first positioning graph and a second positioning graph are detected in the image. A target region is determined from the image based on center positions of the first positioning graph and the second positioning graph, where the target region includes a rectangular region corresponding to the narrow-strip two-dimensional bar code. A data region is determined from the target region, and two-dimensional bar code data is determined from the data region.

Narrow-strip 2-dimensional bar codes, methods, apparatuses, and devices for generating and identifying narrow-strip 2-dimensional bar codes

Implementations of the present application provide a QR code positioning method and apparatus. Based on a predetermined pixel detection rule, centers of candidate position detection patterns in the QR code image are determined from a QR code image that includes first-type pixels and second-type pixels. The predetermined pixel detection rule includes that a consecutive arrangement ratio of the first-type pixels, the second-type pixels, and the first-type pixels satisfies a predetermined ratio. The candidate position detection patterns are identified based on the centers of the candidate position detection patterns. A set of patterns that satisfies a QR code image positioning rule are determined from the candidate position detection patterns. The set of patterns are used as position detection patterns of the QR code image.

QR code positioning method and apparatus

One or more implementations shown in the present specification provide a method for generating an identification code. A center of a detection area is determined. A plurality of concentric circles are determined based on the center. A plurality of position detection patterns whose distance from the center is the radius are determined based on the center and a radius. A start pattern from each position detection pattern is determined. N-ary characters corresponding to a to-be-encoded content to obtain the identification code are encode on the concentric circles based on a position of the start pattern. Codes corresponding to adjacent and same characters in the N-ary characters form an arc line segment. A code corresponding to a character that is different from both adjacent characters in the N-ary characters is a point. Codes corresponding to different characters in the N-ary characters have different colors.

Method and apparatus for generating and identifying identification code

A method and a system for recognizing location information in a two-dimensional code are provided. The method comprises: acquiring a two-dimensional code in an image; performing, according to a main positioning block of the two-dimensional code, feature detection to recognize location information in the two-dimensional code; and determining, according to the location information in the two-dimensional code, spatial location information of the two-dimensional code in the image.

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Hangzhou, China

Yinhai Tu