# US 10,769,469 B2 · Error prompting method, device, and electronic apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,769,469 B2 - Document ID: US10769469B2 - Status: Granted - Kind: B2 - Application number: 16/233,013 - Filed: 2018-12-26 - Published: 2019-07-04 - Granted: 2020-09-08 - Earliest claimed: 2017-12-28 - Assignees: Beijing Xiaomi Mobile Software Co., Ltd. - Applicants: Beijing Xiaomi Mobile Software Co., Ltd. - Inventors: Xuebin Huang - Web page: https://patentgrep.com/patent/US10769469B2 ## CPC - G06V 40/13: Sensors therefor - G01R 27/2605: {Measuring capacitance (capacitive sensors G01D5/24)} - G06V 40/1306: {non-optical, e.g. ultrasonic or capacitive sensing} - G06V: IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING - G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12) ## Abstract A method of prompting a failure or error, applicable to a terminal apparatus including a fingerprint recognizer having a sensor array, includes: obtaining electrical signals containing fingerprint information through the sensor array upon a fingerprint recognition being triggered; determining a number of sensors with abnormally-changing electrical signals in the sensor array; and outputting prompt information upon the determined number of sensors exceeds a number threshold. ## Claims ### Claim 1 A method of prompting a failure or error applicable to a terminal apparatus comprising a fingerprint recognizer having a sensor array, the method comprising: obtaining electrical signals containing fingerprint information through the sensor array upon a fingerprint recognition being triggered; generating a fingerprint image according to the electrical signals containing the fingerprint information; determining a number of sensors with abnormally-changing electrical signals in the sensor array; by: determining, for each sensor in the sensor array, an electrical signal changing value by taking a difference between a current electrical signal value and an initial electrical signal value of the sensor; and determining the number of sensors with electrical signal changing values exceeding a changing value threshold in the sensor array as the number of the sensors with abnormally-changing electrical signals; outputting prompt information upon the determined number of sensors with abnormally-changing electrical signals in the sensor array exceeding a number threshold; obtaining a corrected fingerprint image by removing abnormal pixels from the fingerprint image when it is determined that the number of sensors with abnormally-changing electrical signals in the sensor array does not exceed the number threshold, wherein the abnormal pixels are pixels corresponding to the number of sensors with abnormally-changing electrical signals in the sensor array; and performing the fingerprint recognition based on the corrected fingerprint image. ### Claim 2 (depends on 1) The method of claim 1, further comprising at least one of: obtaining an electrical signal value of each sensor in the sensor array when the terminal apparatus is started as the initial electrical signal value; obtaining the electrical signal value of each sensor in the sensor array when a screen of the terminal apparatus is in an off state as the initial electrical signal value; or reading the initial electrical signal value of each sensor in the sensor array from historical data of the terminal apparatus. ### Claim 3 (depends on 1) The method of claim 1, wherein the performing the fingerprint recognition based on the corrected fingerprint image comprises: obtaining a first image characteristic by performing characteristic extraction from the corrected fingerprint image; comparing the first image characteristic with a second image characteristic of a pre-recorded fingerprint image; and determining that the fingerprint recognition is successful upon the first image characteristic matching the second image characteristic. ### Claim 4 (depends on 1) The method of claim 1, wherein the outputting the prompt information comprises: sending a target message to a target program, wherein the target message is configured to invoke the target program to generate the prompt information in a prompt information bar or a pop-up window. ### Claim 5 A device configured to prompt a failure or error in a terminal apparatus comprising a fingerprint recognizes having a sensor array, the device comprising: a processor; and memory storing instructions executable by the processor; wherein the instructions cause the processor to: obtain electrical signals containing fingerprint information through the sensor array upon a finger recognition being triggered; generate a fingerprint image according to the electrical signals containing the fingerprint information; determine a number of sensors with abnormally-changing electrical signals in the sensor array; by: determine, for each sensor in the sensor array, an electrical signal changing value by taking a difference between a current electrical signal value and an initial electrical signal value of the sensor; and determine the number of sensors with electrical signal changing values exceeding a changing value threshold in the sensor array as the number of the sensors with abnormally-changing electrical signals; output prompt information upon the number of sensors with abnormally-changing electrical signals in the sensor array exceeding a number threshold; obtain a corrected fingerprint image by removing abnormal pixels from the fingerprint image when it is determined that the number of sensors with abnormally-changing electrical signals in the sensor array does not exceed the number threshold, wherein the abnormal pixels are pixels corresponding to the number of sensors with abnormally-changing electrical signals in the sensor array; and perform the fingerprint recognition based on the corrected fingerprint image. ### Claim 6 (depends on 5) The device of claim 5, wherein the instructions further cause the processor to implement at least one of: obtaining an electrical signal value of each sensor in the sensor array when the terminal apparatus is started as the initial electrical signal value; obtaining the electrical signal value of each sensor in the sensor array when a screen of the terminal apparatus is in an off state as the initial electrical signal value; or reading the initial electrical signal value of each sensor in the sensor array from historical data of the terminal apparatus. ### Claim 7 (depends on 5) The device of claim 5, wherein when the fingerprint recognition is performed based on the corrected fingerprint image, the instructions cause the processor to: obtain a first image characteristic by performing characteristic extraction from the corrected fingerprint image; compare the first image characteristic with a second image characteristic of a pre-recorded fingerprint image; and determine that the fingerprint recognition is successful upon the first image characteristic matching the second image characteristic. ### Claim 8 (depends on 5) The device of claim 5, wherein when outputting the prompt information, the instructions cause the processor to: send a target message to a target program, wherein the target message is configured to invoke the target program to generate the prompt information in a prompt information bar or a pop-up window. ### Claim 9 A non-transitory computer-readable storage medium storing instructions for execution by a processing circuit, the instructions comprising: obtaining electrical signals containing fingerprint information through a sensor array in a fingerprint recognizer upon a finger recognition being triggered; generating a fingerprint image according to the electrical signals containing the fingerprint information; determining a number of sensors with abnormally-changing electrical signals in the sensor array; by: determining, for each sensor in the sensor array, an electrical signal changing value by taking a difference between a current electrical signal value and an initial electrical signal value of the sensor; and determining the number of sensors with electrical signal changing values exceeding a changing value threshold in the sensor array as the number of the sensors with abnormally-changing electrical signals; outputting prompt information upon the number of sensors with abnormally-changing electrical signals in the sensor array exceeding a number threshold; obtaining a corrected fingerprint image by removing abnormal pixels from the fingerprint image when it is determined that the number of sensors with abnormally-changing electrical signals in the sensor array does not exceed the number threshold, wherein the abnormal pixels are pixels corresponding to the number of sensors with abnormally-changing electrical signals in the sensor array; and performing the fingerprint recognition based on the corrected fingerprint image. ### Claim 10 (depends on 9) The non-transitory computer-readable storage medium of claim 9, wherein the processing circuit is caused by executing the program to implement one or more of the following: obtaining an electrical signal value of each sensor in the sensor array when the terminal apparatus is started as the initial electrical signal value; obtaining the electrical signal value of each sensor in the sensor array when a screen of the terminal apparatus is in an off state as the initial electrical signal value; or reading the initial electrical signal value of each sensor in the sensor array from historical data of the terminal apparatus. ### Claim 11 (depends on 9) The non-transitory computer-readable storage medium of claim 9, wherein when fingerprint recognition is performed based on the corrected fingerprint image, the processor is caused by executing the program to: obtain a first image characteristic by performing characteristic extraction from the corrected fingerprint image; compare the first image characteristic with a second image characteristic of a pre-recorded fingerprint image; and determine that the fingerprint recognition is successful upon the first image characteristic matching the second image characteristic. ### Claim 12 (depends on 9) The non-transitory computer-readable storage medium of claim 9, wherein when outputting the prompt information, the processor is caused by executing the program to: send a target message to a target program, wherein the target message is configured to invoke the target program to generate the prompt information in a prompt information bar or a pop-up window.