129 results about "Finger detection" patented technology

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.

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 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.

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.