129 results about "Finger detection" patented technology

A method of analyzing and recognizing fingerprint images that utilizes vector processing of a vector field that is defined as the tangential vector of the fingerprint ridge curves is disclosed. The raw fingerprint image is divided into blocks, filtered to remove noise, and the orientation direction of each block is found. This allows the ridge curves to be enhanced and approximated by piece-wise linear approximations. The piece-wise linear approximations to the ridge curves allow the minutiae to be extracted and classified and a fingerprint minutiae template to be constructed. An enrollment process gathers multiple fingerprint images, creates fingerprint minutiae templates corresponding to the acquired fingerprint images, and stores the templates and other data associated with the respective individual or the enrolled fingerprint in a fingerprint database. In an identification process, an unknown raw fingerprint image is obtained via a fingerprint scanner and processed similarly to the enrollment process such that the fingerprint minutiae template of the unknown fingerprint is compared to one or more previously enrolled fingerprint minutiae templates. The identity of the individual associated with the unknown fingerprint is thereby ascertained. In addition, live finger detection can be accomplished in conjunction with the verification or identification process through analysis of the fingerprint image thus enhancing the security of the overall system.

A finger sensing device may include an array of finger sensing electrodes, and a processor cooperating with the array of finger sensing electrodes for operation in a lower power consumption finger detecting mode, and for operation in a higher power consumption reading mode upon detection of a finger. The processor may selectively bus together finger sensing electrodes into at least one group from the array thereof when in the lower power consumption finger detecting mode to thereby detect a finger adjacent the array of finger sensing electrodes. Accordingly, a finger may be accurately detected and while in a low power mode, such as may be particularly beneficial to extend battery life for portable electronic devices.

The present invention discloses an apparatus for determining the presence of a patterned object on the surface of a sensor. The apparatus comprises a sensor system coupled to a means for generating a control signal. The sensor system is configured to sense an image corresponding to the patterned object and to translate the image into image data. The means for generating a control signal generates a control signal if statistics of the image data exceed a pre-determined number of threshold levels. In a preferred embodiment, the patterned object is finger with a fingerprint on its surface and the sensor is fingerprint swipe sensor. Preferably, the threshold levels are software programmable.

A sensor pixel and a touch panel using the same are provided herein, wherein the touch panel has m scan lines and n readout lines. The sensor pixel includes a sensing capacitor, a readout transistor, a reset transistor, a base transistor, and a photo transistor. The photo transistor included in the sensor pixel produces a photo leakage current when it is exposed to a light. The light obstruction characteristic of the photo transistor is utilized to detect the locations of the touched sensor pixels. By proper timing control, the present invention not only can be applied to the multi-finger detection, but also is easy to be implemented.

A method of analyzing and recognizing fingerprint images that utilizes vector processing of a vector field that is defined as the tangential vector of the fingerprint ridge curves is disclosed. The raw fingerprint image is divided into blocks, filtered to remove noise, and the orientation direction of each block is found. This allows the ridge curves to be enhanced and approximated by piece-wise linear approximations. The piece-wise linear approximations to the ridge curves allow the minutiae to be extracted and classified and a fingerprint minutiae template to be constructed. An enrollment process gathers multiple fingerprint images, creates fingerprint minutiae templates corresponding to the acquired fingerprint images, and stores the templates and other data associated with the respective individual or the enrolled fingerprint in a fingerprint database. In an identification process, an unknown raw fingerprint image is obtained via a fingerprint scanner and processed similarly to the enrollment process such that the fingerprint minutiae template of the unknown fingerprint is compared to one or more previously enrolled fingerprint minutiae templates. The identity of the individual associated with the unknown fingerprint is thereby ascertained. In addition, live finger detection can be accomplished in conjunction with the verification or identification process through analysis of the fingerprint image thus enhancing the security of the overall system.

An image pickup scheme capable of always providing an optimum quality of a blood vessel pattern, in image pickup of a blood vessel pattern of a finger using transmitted light, without being affected by a difference, if any, in an external environment. A personal identification apparatus includes light sources for irradiating light to be transmitted by a finger, an image pickup unit for picking up an image using light transmitted by the finger, finger detection unit for detecting that the finger exists in a predetermined position, finger region extraction unit for extracting a region occupied by the finger from an image picked up by the image pickup unit, and gain changing unit for changing an amplification factor of image pickup elements in the image pickup unit on the basis of a picture quality of a specific region within the extracted region.

A method for dynamically controlling an input mode of a touch screen (10) for an electronic device (1) comprising at least one condition detection system (4), wherein the method comprises monitoring humidity in the surrounding of the electronic device (1) by means of the condition detection system (4), and determining, based on the monitored humidity in relation to predetermined values, which input mode is to be used for the touch screen and using the determined input mode for the touch screen.

An image pickup scheme capable of always providing an optimum quality of a blood vessel pattern, in image pickup of a blood vessel pattern of a finger using transmitted light, without being affected by a difference, if any, in an external environment. A personal identification apparatus includes light sources for irradiating light to be transmitted by a finger, an image pickup unit for picking up an image using light transmitted by the finger, finger detection unit for detecting that the finger exists in a predetermined position, finger region extraction unit for extracting a region occupied by the finger from an image picked up by the image pickup unit, and gain changing unit for changing an amplification factor of image pickup elements in the image pickup unit on the basis of a picture quality of a specific region within the extracted region.

A sensor pixel and a touch panel using the same are provided herein, wherein the touch panel has m scan lines and n readout lines. The sensor pixel includes a sensing capacitor, a readout transistor, a reset transistor, a base transistor, and a photo transistor. The photo transistor included in the sensor pixel produces a photo leakage current when it is exposed to a light. The light obstruction characteristic of the photo transistor is utilized to detect the locations of the touched sensor pixels. By proper timing control, the present invention not only can be applied to the multi-finger detection, but also is easy to be implemented.

A gesture recognition device configured to recognize a gesture of a hand from a captured image of a user, having a fingertip candidate detector that detects a fingertip candidate from the image, a finger detector that detects a skin area as a finger, the skin area extending by a predetermined length in a certain direction from the fingertip candidate detected by the fingertip candidate detector, and a gesture type specifying unit that specifies a type of the gesture based on the number of fingers detected by the finger detector.

The invention relates to a fingerprint imaging module and electronic equipment. The fingerprint imaging module comprises an image sensor for obtaining fingerprint images; a touch light source which isarranged on the image sensor and used for generating touch detection light; a waveguide layer which is arranged at one side of the touch light source and on the image sensor and used for transmittingthe touch detection light; and a touch detector which is arranged at the other side of the waveguide layer and opposite to the touch light source and used for detecting the light intensity of the touch detection light transmitted through the waveguide layer and controlling the image sensor to obtain the fingerprint images when the light intensity of the touch detection light is reduced. Accordingto the technical scheme, the module disclosed by the invention has the advantages that the success rate of finger detection can be effectively increased and benefit is brought to improve the successrate of triggering a touch function; and the false touch phenomenon can be effectively reduced and benefit is brought to improve the performance of the fingerprint imaging module.

To provide a fingerprint detection apparatus which is able to detect fingerprints closed to it by the mean of constructing suitable detection algorithms rather than using appended parts meeting the function of finger detection even though fingers are in incompletely contacted to a dependable finger contacting detection functional part, a invention relating to a fingerprint detection apparatus based on the detecting signal obtained by an image detection part is disclosed, which comprises a light source for emitting a light to the finger and an image detection part for detecting fingerprint images.The fingerprint detection apparatus is provided with a light source for emitting a light to the finger and an image detection part for detecting fingerprint images and can detect fingerprints based on the detecting signal obtained by the image detection part. The invention is characterized in that a finger detection mechanism which obtains detection signal from image detection part detects contacted fingers or images obtained by detecting closed fingers based on the difference between background signal of the light from surrounding environment when the light source is lit and the background signal when the light source is not lit detected by the image detection part.