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Finger detection framework based on image grey information

An image grayscale and finger technology, which is applied in the direction of instruments, character and pattern recognition, computer components, etc., can solve the problems of changes in sensor physical parameters and sensor electrical parameters, etc., to eliminate false detection of dirty backgrounds and sensor occupancy The effect of small area and low power consumption

Active Publication Date: 2014-03-26
合肥方程式电子科技有限公司
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Problems solved by technology

[0004] Since the differential detection method is based on the magnitude of the change in electrical parameters for finger detection and judgment, when any physical parameter that can be detected by the electrical parameter detection device approaches the sensor, it will cause changes in the physical parameters near the sensor, resulting in a change in the electrical parameters of the sensor. Variety

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  • Finger detection framework based on image grey information
  • Finger detection framework based on image grey information
  • Finger detection framework based on image grey information

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[0041] Preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. The specific embodiments described here are only used to explain the present invention, and are not intended to limit the present invention.

[0042] see figure 1 , figure 2 , image 3 , Figure 4 , Figure 5 , Figure 6 , a complete finger detection system mainly considers that the following four situations will not cause false finger detection: ⅰ, the surface of the sensor is relatively clean, and when no finger is placed on the sensor for collection, it cannot be detected that the finger is placed on the sensor. Such as figure 1 As shown, when the surface of the sensor is clean, the image grayscale information collected without a finger on the sensor is the image background information. Since the image background value is very large, the calculated threshold point is very large, and the images collected for two consecutive frames are all is the...

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Abstract

The invention provides a finger detection framework based on image grey information. The finger detection framework comprises a histogram statistic module, a threshold point generation module, a local difference maximum value calculation module of two adjacent frame images, an offset result calculation module of the two adjacent frame images, and a finger detection module, wherein S1, the threshold point generation module is used for generating a fingerprint image threshold point according to histogram distribution; S2, the local difference maximum value calculation module of the two adjacent frame images is used for calculating the maximum value of a local difference between the two adjacent frame images and judging whether the two adjacent frame images have a certain difference; S3, the finger detection module is used for judging whether a finger leaves from or is put on a detection table according to the image non-background distribution situation and the difference between the two adjacent frame images; S4, the offset result calculation module of the two adjacent frame images is used for calculating the offset of the two adjacent frame images and judging whether the finger moves in an image acquisition process. Compared with an existing finger detection method, the finger detection framework is more sensitive.

Description

technical field [0001] The invention relates to the field of digital image recognition, in particular to an implementation framework for finger detection based on image grayscale information. Background technique [0002] The existing finger detection technology uses a differential detection circuit to detect finger placement and finger departure. The detection principle is mainly by adding an electrical parameter detection device on the surface or inside of the sensor, such as a thermistor, piezoresistor, capacitor and other devices. According to the capacitance, inductance formed between the surface of the sensor and the finger, or the temperature of the finger itself, the pressure on the contact surface, humidity and other physical parameters change, the electrical parameters such as the voltage or current generated by the electrical parameter detection device change, and the finger release is performed. Up, finger off detection. Since the finger detection circuit is pla...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00G06K9/46
Inventor 田慧
Owner 合肥方程式电子科技有限公司
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