73 results about "False rejection" patented technology

A system and methods for performing authentication to enable a user to access a site monitoring system are provided. The authentication includes voice authentication having at least one threshold that may be dynamically adjustable between false-rejection and false-acceptance. The system includes a processor configured to adjust the at least one threshold for the voice authentication based on at least one factor associated with the site monitoring system. The processor may be configured to perform voice authentication based on the adjusted at least one threshold to authenticate the user.

A fast position tolerant and economical fingerprint verification algorithm and software implementation is disclosed. The algorithm has very important advantages in comparison to existing fingerprint verification algorithms like minutia extraction or full image analysis based on a series of two dimensional fast Fourier transforms (FFT's) and two dimensional cross correlation in speed, compactness of the biocript and finger positioning for verification. It is based on a small "yardstick" pattern being moved inside the image to be verified, and when a match is found the rest of the verification process is started. The software code implements the algorithm in the most efficient way for utilization on a digital signal processor architecture. A main area of application is in fingerprint identification and verification, but it could be implemented with same success in other image verification systems like iris, eye, face etc., where two images should be compared. The algorithm is adaptive, so various false acceptance and false rejection coefficients could be utilized very easily. It also produces a very compact biocript, which leads to better memory utilization in fingerprint databases.

Methods and apparatus are provided for sequential authentication of a user that employ one or more error rates characterizing each security challenge. According to one aspect of the invention, a user is challenged with at least one knowledge challenge to obtain an intermediate authentication result; and the user challenges continue until a cumulative authentication result satisfies one or more criteria. The intermediate authentication result is based, for example, on one or more of false accept and false reject error probabilities for each knowledge challenge. A false accept error probability describes a probability of a different user answering the knowledge challenge correctly. A false reject error probability describes a probability of a genuine user not answering the knowledge challenge correctly. The false accept and false reject error probabilities can be adapted based on field data or known information about a given challenge.

A Circuit (in FIG. 1) and an Algorithm for Data Acquisition from Capacitive Touch Pad Sensor employs charge transfer to sense capacitance. The circuit has high degree of noise rejection from both system and externally generated noises; it is resistant to the effects of ESD; utilizes a general purpose “off the shelf” components and programmable microcontroller (element providing flexibility for changes and adjustments without incurring the high costs of a custom IC design. A settling time and low sensitivity to the noise.

A system for confirming the detection of a fire using a plurality of radiation or flame sensors each equipped with a radiation detector and an optical filter having a spectral transmission characteristic in which at least one optical filter is redundant to at least one other optical filter. The result is a system having operationally redundant sensors. In use, if a fire is detected by one of the redundant sensors without including the other redundant radiation sensor in the fire detection calculation, then a fire detection algorithm can switch to the other operationally redundant sensor to check for confirmation of a fire. Due to the spatial separation and if the object is small and close, a different result will be obtained with the redundant detector being used in the calculation compared to the primary detector that is associated with the redundant detector.

The presence of moisture on a touch screen device can mimic a user's touch causing false input detection and recognition. Disclosed are systems and methods for detecting the presence of moisture on a touch screen device.

A method and apparatus to identity SPAM emails is disclosed. The method sets a misspelling rejection ratio. Upon receipt of an email comprising (X) words, the method determines the number (Y) of misspelled words comprising that email. The method then calculates a misspelling ratio by dividing (Y) by (X), and then determines if the misspelling ratio is greater than or equal to the misspelling rejection ratio. If the method determines that the misspelling ratio is greater than or equal to the misspelling rejection ratio, then the method reports the email as SPAM. In certain embodiments, the detection of words used to trigger the rejection of SPAM is based on a fuzzy search of alternate spellings. These alternate spellings may come from a spell checker.

The invention diWscloses a method for detecting infrared small targets under a cloud background based on temperate filtering and false alarm rejection. The method comprises the following steps: firstly, obvious noises are removed from an image through maximum median filtering to complete image preprocessing; secondly, Robinson template filtering is used to suppress the background and highlight targets; thirdly, cloud partitioning of the original image is carried out, binarization processing of a result obtained after the Robinson template filtering is carried out through a low threshold in a cloud partition, and binarization processing of the result obtained after the Robinson template filtering is carried out through a high threshold in a non-cloud partition; finally, a plurality of ''false target points'' generated by a same target are further removed from the binarization results to complete ''coarse detection'', and time domain processing is continued for adjacent frame images that have gone through space domain processing to complete ''fine detection'', so that the detection of the infrared small targets is achieved. The method provided by the invention has the advantage that the constant false alarm rejection algorithm is added in interframe track correlation, so that the detection false alarm rate is greatly reduced.

A system and method is provided that creates a touch recognition gradient beginning from all outer edges of a touch sensor, and extending inwards towards a designated center area, wherein contact that is nearer an outer edge of the touch sensor is only recognized if it is a relatively small object, and then allowing recognition of progressively larger objects when approaching the center area, thereby rejecting input from a palm or larger area of a finger when contact is made near the outer edge, while accepting larger objects near the center area.

Access to a resource may be denied in response to a score value being below a threshold value. The score value may be based on timing information of key-press and key-release events. After denying access to the resource, the timing information of key-press and key-release events may be incorporated into the keystroke dynamics template.

An improved touchpad and measurement circuitry for enabling input to a computer or other electronic device. The system includes an X electrode, a Y electrode, a common sensing electrode, and a “water” electrode, wherein these four separate electrodes can be implemented in various physical configurations to obtain the desired effects, wherein moisture and water droplets can be identified and compensated for so as not to interfere with the input of data, wherein noise rejection is achieved by using a time aperture filtering method, wherein an improved scanning technique focuses scanning around an identified input object, wherein an adaptive motion filter responds to the speed and acceleration of an object being tracked, and wherein the measurement circuitry has an increased dynamic range enabling the touchpad to operate with greater tolerances to manufacturing variances.

Speaker recognition (identification and/or verification) methods and systems, in which speech models for enrolled speakers consist of sets of feature vectors representing the smoothed frequency spectrum of each of a plurality of frames and a clustering algorithm is applied to the feature vectors of the frames to obtain a reduced data set representing the original speech sample, and wherein the adjacent frames are overlapped by at least 80%. Speech models of this type model the static components of the speech sample and exhibit temporal independence. An identifier strategy is employed in which modelling and classification processes are selected to give a false rejection rate substantially equal to zero. Each enrolled speaker is associated with a cohort of a predetermined number of other enrolled speakers and a test sample is always matched with either the claimed identity or one of its associated cohort. This makes the overall error rate of the system dependent only on the false acceptance rate, which is determined by the cohort size. The false error rate is further reduced by use of multiple parallel modelling and/or classification processes. Speech models are normalised prior to classification using a normalisation model derived from either the test speech sample or one of the enrolled speaker samples (most preferably from the claimed identity enrolment sample).

For managing multiple touch sources with palm rejection, a method is disclosed that includes detecting an instrument touch on a touch screen of a computing device, the instrument touch performed by a handheld instrument, disabling user touch for a portion of the touch screen, the disabled portion selected in accordance with a usage pattern, and accepting a user touch of the touch screen outside of the disabled portion.

In a method and apparatus for operating a super-heterodyne receiver, a tuning circuit has a local oscillator for frequency shifting a desired channel to a selected frequency and a controller for controlling the local oscillator. The controller determines for each of a number of identified channels, whether an image signal is present at frequencies in the spectrum that when tuned to a first selected frequency interfere, and is operable to select a modified selected frequency at which interference between the image signal and the identified channel is reduced.

Computer-implemented method and system are provided to identify superior models relative to a benchmark model in a step-wise fashion while reducing data snooping bias and increasing the test power. The data snooping bias may be reduced or avoided by controlling, in a step-wise fashion, a measure of error such as generalized family-wise error rate (FWER) and/or false discovery proportion (FDP). The test power of the method may be increased by relaxing the generalized FWER to tolerate more falsely rejected models and applying re-centering techniques to account for the inclusion of potentially “poor” models in the evaluation.

An image rejection (IR) circuit is configured to receive a complex signal from a radio frequency (RF) mixer, where the complex signal includes an in-phase signal portion and a quadrature signal portion. This IR circuit may include: an in-phase path to remove first mismatch information from the in-phase signal portion and associated with at least one in-phase multi-tap filter; a quadrature path to remove second mismatch information from the quadrature signal portion and associated with at least one quadrature multi-tap filter; and a correlation unit to independently update each of the multiple taps of the in-phase multi-tap filter and the quadrature multi-tap filter according to a priority scheme.