Fingerprint detection apparatus

Abstract

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.

Description

technical field [0001] The present invention relates to a fingerprint detection device, in particular to a fingerprint detection device which has a light source for irradiating fingers and an image detection mechanism for detecting fingerprint images, and detects fingerprints based on the detection signal of the image detection mechanism. Background technique [0002] In a general fingerprint detection device, in order to reduce power consumption, the software of the control system is used to make the fingerprint sensor in the active state to take pictures of the fingerprints, and in turn detect the contact between the finger and the fingerprint detection device and start the software to take pictures of the fingerprint images. Ease of use and low power consumption, the latter is often used in battery-driven systems. [0003] In the optical fingerprint detection device, as a method of detecting the contact of the finger with the imaging surface, there is a method of detectin...

AI Technical Summary

Problems solved by technology

However, in order to realize a satisfactory finger detection function, additional parts are required, so there are problems such as an increase in product cost

[0007] In addition, the method of detecting the unevenness of the fingerprint is also difficult to use because the reference value for judgment and detection varies greatly depending on the surrounding environment such as outdoor sunlight or nighttime.

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