78 results about "Fingerprint alignment" patented technology

The invention relates to a method for reducing the false reject rate of fingerprint comparison. The method comprises the following steps of: extracting fingerprint characteristics by a fingerprint sensor; quickly searching in a plurality of templates, and comparing the templates with the existing template to obtain the highest comparison score; and judging whether comparison passes according to acomparison passing rule, and replacing the templates or not according to an auxiliary template replacement rule. The method has the advantages that: an auxiliary template is added and dynamically updated in an application process, so the capacity for environmental adaptation of the sensor is greatly improved, anti-aging capacity is improved, the range of a comparison object is expanded, and the false reject rate is effectively reduced; the fingerprint characteristics in a fingerprint comparison auxiliary threshold interval are required to be compared with fingerprint templates one by one; andwhen more than two characteristic comparison scores are in the fingerprint comparison auxiliary threshold interval, comparison is determined to pass, so the false reject rate of the fingerprint comparison is effectively reduced under the condition that no false accepting is guaranteed.

Exemplary embodiments of method and apparatus for processing the images of fingerprints can be provided. For example, aligned images can be subjected to a tessellation process, whereas each image can be partitioned into a number of regions. Within each region at least one parameter associated with the ridges can be measured and stored. Such exemplary parameter can include, e.g., the prevailing ridge orientation, the average ridge separation and the phase of the ridges. The data can be projected and stored in a multidimensional coordinate system, whereas the representations of any two data can be separated by an amount corresponding to the dissimilarity of these data.

The invention discloses a method for verifying software completeness. The method comprises the following steps: acquiring path of a loaded executable file through capturing system call of an upper operation system in a virtual machine monitor; acquiring a Hash value of the executable file according to the path of the executable file; comparing the Hash value of the executable file with software fingerprints in a fingerprint bank; and carrying out completeness verification on the executable file according to the result of fingerprint comparison. The invention also discloses a software completeness verification system. The method and the system for software completeness verification realize software completeness verification in the virtual monitor, is independent of the operation system without depending on completeness of the operation system, improves security of the system, and has universality and compatibility. The technical proposal belongs to completeness verification of softwarein loading period, reduces verification cost without support of auxiliary hardware, reduces cost and improves performance compared with the method for verifying completeness of a file system.

The invention provides a non-contact fingerprint identification method and device, a terminal and a storage medium. The method comprises the following steps: a finger identification step of shooting ahand of an identification object, judging whether a finger exists in a shot picture or not, and determining the position of the finger when the finger exists; a fingerprint acquisition step of performing focusing photographing on the finger under the condition that the finger is detected in the finger identification step, and acquiring respective fingerprint images of the finger; an image transmission step of encrypting the fingerprint images of the fingers acquired in the fingerprint acquisition step, and transmitting the encrypted fingerprint images to a comparison system; a fingerprint comparison step: comparing the fingerprint image with fingerprint data in the comparison system to obtain a comparison result. According to the method disclosed in the invention, non-contact fingerprintidentification can be realized, and the user experience is improved.

The invention discloses an alignment-free fingerprint matching method based on an encrypted circuit. The alignment-free fingerprint matching method based on the encrypted circuit comprises the steps that a detail point template set of fingerprints and an onsite sample detail point set are established, a line characteristic set OT and a local structure characteristic set DT are established based on the detail point template set, and a line characteristic set OQ and a local structure characteristic set DQ are established based on the onsite sample detail point set; point-by-point comparison is carried out on elements in the line characteristic set OT and elements in the line characteristic set OQ and on elements in the local structure characteristic set DT and elements in the local structure characteristic set DQ, and thus an NT*NQ matrix UO and an NT*NQ matrix UD are formed; similarity computing is carried out on the matrix UO and the line characteristic set OQ, the similarity computing is carried out on the matrix UD and the local structure characteristic set DQ, and the matching of the fingerprints is completed according to similarity. The invention discloses a computing circuit at the same time. The alignment-free fingerprint matching method based on the encrypted circuit and the computing circuit achieve the purpose that the fingerprint matching can be achieved without fingerprint alignment on the basis that private data of users and private data of authentication servers are protected.

The invention relates to a method for reducing the rejection rate of fingerprint comparison. The fingerprint feature is extracted by a fingerprint sensor, quickly searched among many templates, and compared with the existing templates to obtain the highest comparison score; the comparison is judged according to the comparison passing rules Whether it is passed, the template is replaced or not replaced according to the secondary template replacement rules. The beneficial effects of the present invention are: the auxiliary template is added, and the auxiliary template is dynamically updated during the application process, which greatly improves the adaptability of the sensor to the environment, improves the anti-aging ability, and increases the range of comparison objects to effectively The rejection rate is reduced; at the same time, the fingerprint comparison assists the threshold interval. The fingerprint features in this interval need to be compared with the fingerprint template one by one. If the comparison scores of more than two features are found within this interval, the comparison Yes, this effectively reduces the rejection rate of fingerprint comparison while ensuring that no false identification is made.

The present invention belongs to the computer biometrics technology and relates to a method and a system which adopt certainty coding to accurately match fingerprints during the process of fingerprint comparison. The present invention has the accurate matching by using characteristic of the certainty coding that a characteristic area can be selected from the fingerprint image and the characteristic value corresponding to the characteristic area, such as the total length of fingerprint ridge line, the entropy of the main direction of the direction field of the ridge line and the direction field of the pixel point, to conduct matching work. The certainty coding method and the fingerprint identification system built by the method overcome the defects, such as low accuracy rate and potential safety problems which are caused by adopting fuzzy matching algorithm in the traditional point fingerprint identification system.

The invention discloses card reader auxiliary equipment and a working method thereof, and belongs to the field of card readers. Whether a card exists or not is detected through the card reader auxiliary equipment based on the card reader non-contact field, the card reader auxiliary equipment opens the self non-contact field when detecting that the card exists, enough field intensity is provided for the fingerprint card, fingerprint comparison of the fingerprint card can be completed, the card reader auxiliary equipment obtains the current time of the timer, whether the current time is greaterthan a first preset time is judged, and if so, the own non-contact field is closed. According to the invention, fingerprint comparison of the card can be realized without upgrading the card reader, sothat communication between the card and the card reader can be completed smoothly.

The fingerprint identification method disclosed in the present invention includes: collecting a fingerprint image to be compared, extracting a plurality of feature points of the fingerprint image to be compared and calculating a plurality of description values ​​corresponding to each feature point; calculating a retrieval value of each feature point; Compare the fingerprint image to be compared with a template image, specifically including: first compare the retrieval value of the feature point with the retrieval value of the template feature point, if the retrieval value of the feature point matches the retrieval value of the template feature point, continue to compare The description value of the feature point and the description value of the template feature point are used to judge whether the feature point matches the template feature point; A template feature point is compared; the number of times that different feature points match different template feature points is counted to determine whether the fingerprint image to be compared matches the template image. The above-mentioned fingerprint recognition method can improve the speed of fingerprint comparison. The invention also discloses the electronic device.