Abstract: Embodiments of this application disclose a target tracking method performed at an electronic device. The electronic device obtains a first video stream and detects candidate regions within a current video frame in the first video stream. The electronic device then extracts, from the candidate regions, a deep feature corresponding to each candidate region and calculates a feature similarity for each candidate region and a deep feature of a target detected in a previous video frame. Finally, the electronic device determines, based on the feature similarity corresponding to the candidate region, that the target is detected in the current video frame. Target detection is performed in a range of video frames by using a target detection model, and target tracking is performed based on the deep feature, so that occurrence of cases such as a target tracking drift or loss can be effectively prevented, to ensure the accuracy of target tracking.

Abstract: A method and device for realizing a verification code are provided. In some embodiments, a character verification code is obtained and displayed when it is determined to perform identity verification. The character verification code has an incorrect character based on a priori knowledge. The user is prompted to input a correct character corresponding to the incorrect character in the character verification code. Verification information is received. It is determined that the verification is successful when the verification information corresponds to the correct character of the prior knowledge; otherwise, the verification failed.

Abstract: A method and device for realizing a verification code are provided. In some embodiments, a character verification code is obtained and displayed when it is determined to perform identity verification. The character verification code has an incorrect character based on a priori knowledge. The user is prompted to input a correct character corresponding to the incorrect character in the character verification code. Verification information is received. It is determined that the verification is successful when the verification information corresponds to the correct character of the prior knowledge; otherwise, the verification failed.