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Method for compressing fingerprint direction quantized diagram to embedded system

An embedded system, quantization compression technology, applied in image coding, image data processing, character and pattern recognition, etc., can solve problems such as difficult to meet the requirements of embedded automatic fingerprint recognition system, large storage space, etc.

Inactive Publication Date: 2007-04-04
INST OF AUTOMATION CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It can be found that even if only the block direction field data is stored, a large storage space is still required, and it is difficult to meet the requirements of the embedded automatic fingerprint identification system

Method used

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  • Method for compressing fingerprint direction quantized diagram to embedded system
  • Method for compressing fingerprint direction quantized diagram to embedded system
  • Method for compressing fingerprint direction quantized diagram to embedded system

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Embodiment Construction

[0015] The operation process of the method for quantizing and compressing fingerprint orientation graphs oriented to embedded systems will be further described below through embodiments. As shown in Figure 1, the specific implementation steps of the direction map quantization and compression storage are as follows:

[0016] (1-1) Determine the quantization level and segment bit storage parameter N. If the maximum number of bits used to store the direction field data is recorded as N, then the quantization level of the direction field data is 2 N . According to the accuracy requirements of the algorithm and the capacity requirements of the template, we need to find a compromise between quantization accuracy and compression efficiency. Generally, N can be selected to be equal to 3, 4, 5 or 6.

[0017] (1-2) Quantization of pattern data. The angle of the block orientation field is normalized to an integer range by quantization. The angle θ of the direction field is generally ...

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Abstract

This invention is to open a quantized compressing method for finger-print directional graph in a embedding system. It is includes: 1. quantize level and sectional storage parameter selection; 2. directional graph quantification; 3. getting forward difference of the quantized directional graph; 4. substitute the original data by the sum of the repeating times of forward difference and the original data; sectional store the directional data and the forward difference; read the compressed data by the method stated in procedure 4.

Description

technical field [0001] The invention belongs to the field of embedded system technology and digital image processing technology, and particularly relates to digital image compression coding and embedded system data storage technology, in particular to a method for fingerprint direction map quantization and data compression storage and reading suitable for embedded systems. Background technique [0002] Fingerprint identification or verification is generally achieved by comparing and matching fingerprint feature data, which is called a template. The template is not the original fingerprint image, but a digital representation of key features in the fingerprint image. The template is formed after extracting key features from the input fingerprint image, which can save the storage space of the fingerprint identification system, reduce the capacity of the network transmission channel, and facilitate the remote matching of fingerprints. Commonly used features in automatic fingerp...

Claims

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Application Information

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IPC IPC(8): G06T9/00G06K9/00
Inventor 赵绪营王阳生
Owner INST OF AUTOMATION CHINESE ACAD OF SCI
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