公开(公告)号：WO1980002080A1

公开(公告)日：1980-10-02

申请号：PCT/US1980000265

申请日：1980-03-13

Applicant: NCR CORP

Inventor： NCR CORP ,  ADVANI J ,  WHITELY R ,  HALE W ,  PAGANINI B

IPC: G06K09/46

CPC classification number: G07C9/0015 ,  G06K9/00167 ,  G06K9/522

Abstract: A method and apparatus for verifying the identity of a person by first establishing and storing in a storage unit (116) a reference vector based upon predetermined characteristics derived from a number of handwritten signature samples. In the verification mode, a person whose identity is to be verified enters an identification number on a keyboard (144) thereby selecting his reference vector from the storage unit (116). The person then writes his signature on a signature pad (108), the written signature generating an analog waveform which is digitized, the digitized representation then being compressed. Thereafter, parameters dependent on Haar coefficients and on physical features are computed to provide a vector which is compared with the reference vector utilizing a comparison threshold which has been predetermined for that person.

公开(公告)号：WO1980001851A1

公开(公告)日：1980-09-04

申请号：PCT/US1980000195

申请日：1980-02-25

Applicant: NCR CORP

Inventor： NCR CORP ,  WHITELY R

IPC: G06F15/46

CPC classification number: G01R17/06 ,  G01D3/032 ,  G01R17/02 ,  G07C9/0015

Abstract: In order to compensate for drift of the null point of a measuring device (12), particularly a signature verification device, an analog measurement signal on line (16) is compared in an operational amplifier (18) with a compensating signal from a digital to analog converter (32) to provide a comparison output signal on line (22), which represents a signal compensated for drift. The comparison output signal is fed via an analog to digital converter (24) to a microcomputer (28) for further processing. The microcomputer is arranged to compute a value of compensating signal which accurately compensates for drift of the null point of the measuring device, and to this end stores a prior value of the comparison output signal with the measuring device in a null point condition and compares this with the current value of the comparison output signal with the measuring device in a null point condition. Depending on the result of such comparison, the stored value is modified. This operation is repeated until the comparison output signal attains a zero value, the stored value then representing a compensating value which is applied to the digital to analog converter (32) for providing a compensating signal for subsequent use of the measuring device (12).

Abstract translation: 为了补偿测量装置（12），特别是签名验证装置的零点的漂移，将运行放大器（18）中的线路（16）上的模拟测量信号与从数字到 模拟转换器（32）以在线（22）上提供比较输出信号，其表示补偿漂移的信号。 比较输出信号通过模拟数字转换器（24）馈送到微计算机（28）以供进一步处理。 微计算机被配置为计算准确地补偿测量装置的零点的漂移的补偿信号的值，并且为此，在零点条件下将测量装置的比较输出信号的先前值存储在比较器 其中比较输出信号的当前值与测量装置处于零点条件。 根据这种比较的结果，存储的值被修改。 重复该操作直到比较输出信号达到零值，然后存储的值表示施加到数模转换器（32）的补偿值，以提供用于后续使用测量装置（12）的补偿信号。