Scan fingerprint image reconfiguration method based on movement estimation

A motion estimation, fingerprint image technology, applied in image communication, computing, computer parts and other directions, can solve problems such as affecting the accuracy of recognition algorithms, distortion and deformation, and restricting the popularization and application of sliding fingerprint sensors

Inactive Publication Date: 2007-01-03
INST OF AUTOMATION CHINESE ACAD OF SCI
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  • Summary
  • Abstract
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AI Technical Summary

Problems solved by technology

However, the fingerprint image reconstructed by the existing software has different degrees of distortion and deformation, which affects the accuracy of the subsequent recognition algorithm, thus limiting the further popularization and application of the sliding fingerprint sensor.

Method used

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  • Scan fingerprint image reconfiguration method based on movement estimation
  • Scan fingerprint image reconfiguration method based on movement estimation
  • Scan fingerprint image reconfiguration method based on movement estimation

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0015] The implementation process of this motion estimation-based scanning fingerprint image reconstruction method is as follows: figure 1 As shown, the specific steps are as follows:

[0016] (1-1) Segment and locate the starting position of the finger sweeping the sensor. The method is to count the contrast histogram of the continuous scanning image, and iteratively select the threshold to judge whether it is the background or the fingerprint image, and assist the hardware to detect and locate the starting point of the scanned fingerprint image. Location;

[0017] (1-2) Buffering of continuously scanned images. Taking an 8-line sensor as an example, 10 frames of continuously scanned images are cached and updated in real time;

[0018] (1-3) calculate the motion vector of the continuous image of cache;

[0019] (1-4) Stitching fingerprint images. Make full use of the limited vertical resolution of the scanned image, transform the motion vector of the continuous frame imag...

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Abstract

The invention relates to reconfiguration method of the scan fingerprint figure based on the sports estimation. It includes the process: dividing the start and the stop position when the location finger is scanned through the sensor; storing and updating the scanning figure continuously; predicting the sports vector of the figure in the condition of the sliding finger moves in the uniform speed or the uniform acceleration speed; according to the vector to select the reference macromodule dynamically and predict the best matching module to get the sports vector; adjusting the domain of the searching matching module using the difference of the sports vector and the predicting vector as the feedback quantity; changing the sports vector of the continuous frame figure to splice the fingerprint figure.

Description

technical field [0001] The invention relates to the field of image processing and matching technology, in particular to motion compensation prediction technology of video coding, which adopts a sub-pixel precision variable block matching multi-frame motion estimation method to realize image reconstruction of a sliding fingerprint sensor. Background technique [0002] Due to the uniqueness and stability of fingerprint features, fingerprint recognition technology has been applied in the field of criminal investigation very early, and has achieved great success. In recent years, the demand for identity authentication in various fields has been increasing, and with the gradual acceptance and recognition of the public, the automatic fingerprint identification system (AFIS) technology will be more widely used in the civilian market. The application and promotion of automatic fingerprint identification technology is closely related to the development of fingerprint sensor technolog...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00H04N7/32H04N19/51H04N19/80
Inventor 王阳生赵绪营师忠超漆进
Owner INST OF AUTOMATION CHINESE ACAD OF SCI
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