Beijing Bytedance Network Technology Co., Ltd.

Beihang University

Meng Xie

Zhen Liu

Bo Zhang

Guangjun Zhang

Zhenzhong Wei

Junhua Sun

Yuren Zhang

The present disclosure provides a request identification method and apparatus, a device, and a storage medium. The method includes: obtaining a to-be-identified access request and a frequent item set for identifying an abnormal request, the frequent item set including a target client feature obtained based on mining of historical request data, a quantity of historical request data corresponding to the target client feature being greater than a predetermined frequent threshold, and the frequent item set being an item set that passes a request timestamp distribution abnormality detection; matching client information carried in the to-be-identified access request with the target client feature included in the frequent item set to obtain a matching result; and determining, when the matching result indicates a successful match, the to-be-identified access request as an abnormal request. The abnormal request is identified based on the pre-generated frequent item set for identifying the abnormal request.

Request identification method and apparatus, device, and storage medium

The present disclosure provides a global calibration method based on a rigid bar for a multi-sensor vision measurement system, comprising: step 1, executing the following procedure for at least nine times: placing, in front of two vision sensors to be calibrated, a rigid bar fasten with two targets respectively corresponding to the vision sensors; capturing images of the respective targets by their corresponding vision sensors; extracting coordinates of feature points of the respective targets in their corresponding images; and computing 3D coordinates of each feature points of the respective targets under their corresponding vision sensor coordinate frames; and Step 2, computing the transformation matrix between the two vision sensors, with the constraint of the fixed position relationship between the two targets. The present disclosure also provides a global calibration apparatus based on a rigid bar for a multi-sensor vision measurement system. Putting the present disclosure to use can increase the accuracy of the global calibration, and also be suitable for the calibration of the multi-sensor vision system in the extremely large working space, which enlarges the application range of the present disclosure.

Global calibration method with apparatus based on rigid bar for multi-sensor vision

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Beijing, China

Meng Xie