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Method and arrangement for assessing the quality of skin print images

An image and imprinting technique, applied in the field of evaluating the image quality of skin imprinting, which can solve the problems of unfavorable image quality, damage to low-quality image systems, errors, etc.

Inactive Publication Date: 2010-01-20
NXP BV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] When an image is composed of fingerprints or other skin imprints, various factors may adversely affect image quality and, when evaluating a set of reference imprints and when subsequently examining or identifying fingerprints, these factors may may cause problems that either make any inspection or identification impossible, or may even lead to erroneous results
[0003] Low-quality images of skin prints often result in images being rejected, however, if the worst image achieves the worst results, and if skin prints are mistakenly accepted as correct images due to poor image quality, these low-quality images may damage the system

Method used

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  • Method and arrangement for assessing the quality of skin print images
  • Method and arrangement for assessing the quality of skin print images
  • Method and arrangement for assessing the quality of skin print images

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Embodiment Construction

[0016] For brevity, as in figure 1 The tiles shown are only 4x4 pixels. In this tile, again as a major simplification, there are only two relief parts 2, 3, which have been represented as dotted lines for the rules of the patent drawings. Also, it is not allowed to represent either the features after the gray level or any local quantification by the scanning process. For each pixel, a gradient 4 is calculated by methods known per se, this gradient being independent of the sign of the edges of the reliefs 2 , 3 as described above. Since the relief has no particularly well-defined curvature at most points in the skin-print image, the gradients essentially take similar directions.

[0017] The length of the gradient will not be faithfully representative of the actual situation. It just means that gradients may have different lengths. For further processing, the components in the x and y directions are placed in the corresponding direction matrices.

[0018] As shown, figur...

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Abstract

In a method and an arrangement for assessing the quality of skin print images, and particularly fingerprint images, provision is made for gradients to be formed for the individual picture elements (pixels) of the skin print image, for a mean value to be formed from the gradients of the pixels in one region of the image (tile) at a time, and for similarities in the mean values from tile to tile to form a measure of quality.

Description

technical field [0001] The present invention relates to methods for evaluating the quality of images of skin prints, and in particular, to methods for evaluating fingerprint images. The invention also relates to a device for carrying out such a method. Background technique [0002] When an image is composed of fingerprints or other skin imprints, various factors may adversely affect image quality and, when evaluating a set of reference imprints and when subsequently examining or identifying fingerprints, these factors may Problems may arise that either make any inspection or identification impossible, or may even lead to erroneous results. Depending on the principle and construction of the sensors used, the resulting image quality may be adversely affected by dirt on the finger, or moisture, oil, or by an overly dry finger. Dirt and dirt in or on the sensor itself is another possible cause of poor skin print image quality. In addition to this reason, it may also cause the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K9/00G06T7/00
CPCG06K9/00067G06K9/036G06V40/1347G06V10/993
Inventor S·肖泽R·梅尔
Owner NXP BV
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