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A boot adaptive initialization fingerprint parameter method based on android system

An adaptive and initialization technology, applied in the direction of digital data authentication, image data processing, image enhancement, etc., can solve problems such as the difference of image brightness and darkness, shorten adjustment time, avoid adjustment errors, and improve compatibility and functionality. Effect

Active Publication Date: 2022-03-22
SHENZHEN BETTERLIFE ELECTRONICS SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In addition, due to factors such as different batches of fingerprints and process differences (wafer, packaging, module production) and other factors, different fingerprints will have certain differences in the brightness and darkness of the image under the same initialization parameter dacp value.

Method used

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  • A boot adaptive initialization fingerprint parameter method based on android system
  • A boot adaptive initialization fingerprint parameter method based on android system
  • A boot adaptive initialization fingerprint parameter method based on android system

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Experimental program
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Embodiment 1

[0047] In this embodiment, the preset fingerprint ic can be used, which has 80*64 pixels. The adjustment process in this embodiment mainly involves three aspects: calculating the corresponding index, and suspending the adjustment when the fingerprint is pressed or there is a covering. See figure 1 , the specific steps include:

[0048] 1. Calculate the corresponding noise image index:

[0049] 1. Calculate the mean value and mean square error of the image (for the convenience of calculation, use the mean absolute difference instead), and calculate its histogram as a global histogram. Due to problems such as chip packaging, there are 2*2 black borders during imaging, which is harmful to the calculation of some indicators Noise effect, so when calculating the black point black_num (non-white point 255), use the image with 2*2 black edges removed, and calculate its histogram as a local histogram;

[0050] 2. Calculate the pixel values ​​index_max and index_max_all of the maximu...

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Abstract

The present invention discloses a boot adaptive initialization fingerprint parameter method based on an android system, which includes the following steps: step S1, calculating noise image index; step S2, identifying data collected by a fingerprint sensor through a preset fingerprint IC, Judging whether the fingerprint sensor has collected fingerprints or coverings, if not, then perform step S4; step S4, adjust fingerprint parameters: step S4.0, determine the lower limit A and upper limit B of the noise according to the noise histogram, and use index_max_all is in the [A,B] interval, if index_max_all>B, then reduce the dacp value, if index_max_all

Description

technical field [0001] The present invention relates to a fingerprint parameter processing method, in particular to a boot adaptive initialization fingerprint parameter method based on an android system. Background technique [0002] At present, as fingerprint technology becomes more and more popular, many android system devices are equipped with fingerprint peripherals, especially mobile phones, fingerprints have basically become standard configurations, and fingerprint testing is becoming more and more perfect. It is related to user safety and requires fingerprint stability. It is very high, but due to factors such as different fingerprint batches and poor workmanship, different fingerprints will have certain differences in the brightness and darkness of the image under the same initialization parameter dacp value, so a fixed initialization parameter dacp value is used to adapt to all fingerprint sensors. In some scenarios, there may be functional problems. [0003] In th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F21/32G06F9/4401G06T5/00G06T5/40
CPCG06F21/32G06F9/4403G06T5/40G06T5/70
Inventor 钟思聪张弛余佳
Owner SHENZHEN BETTERLIFE ELECTRONICS SCI & TECH