CN103020953A - Segmenting method of fingerprint image - Google Patents
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Abstract
The invention discloses a segmenting method of a fingerprint image. The segmenting method specifically comprises the following steps: a, reading in the fingerprint image; b, quickly cutting the fingerprint image; c, transforming in reverse colour; d, equalizing; e, carrying out top-hat transformation; f, calculating the characteristic quantity in blockst; g, segmenting in blocks; h, processing the image according to morphology; and i, obtaining the segmented fingerprint image. The segmenting method of the finger image is applicable to the fingerprint image poorer in quality, can correctly segment the fingerprint, and is higher in reliability; the ISODATA (Iterative Self-organizing Data Analysis Techniques Algorithm) clustering algorithm is adopted and used for segmenting in blocks, and the clustering speed is higher; the quick cutting way is carried out, thereby the processing time is reduced; the block segmenting mode and pixel segmenting mode are combined, thus the segmented fingerprint is relatively smooth in contour; and the image equalizing mode and the top-hat transformation mode are adopted to enhance the image, and as a result, the segmenting is more efficient.
Description
Technical field
The present invention relates to a kind of Pre-processing Method for Fingerprint Image, particularly a kind of dividing method of fingerprint image.
Background technology
Fingerprint image identification be use the earliest in the human biometrics identification technology, the cheapest branch of price, be widely used in criminal investigation and case detection, house safety, the identity validation of the financial institutions such as bank, security, insurance, gate inhibition's control of important area, the field such as office worker or member management has broad application prospects.
Fingerprint Image Segmentation is the important step of fingerprint identification pretreatment stage, fundamental purpose is to remove non-fingerprint region and the more finger-print region that is not easily distinguishable of noise, effectively cut apart the time that can reduce subsequent treatment, reduce the extraction of pseudo-characteristic point, improve recognition accuracy.
Fingerprint segmentation method commonly used has at present: a is according to the dividing method of gradation of image characteristic, utilize fingerprint image average gray and variance that fingerprint image is cut apart, having global threshold to cut apart with adaptive threshold cuts apart, global threshold is cut apart and is depended on the well-distributed bimodality of gradation of image, if bimodality is not obvious or gray scale is the multimodal distribution, segmentation effect is just undesirable, adaptive threshold is cut apart can be low with contrast and the Region Segmentation of the easy recovery of high directivity is fallen, and there is blocking effect in the fingerprint image after cutting apart; B is according to the dividing method of fingerprint image orientation and frequency characteristic, this method more complicated, and the calculating of particularly putting direction or dot frequency, zone or the central cam near zone inhomogeneous to the crestal line thickness are difficult to accurate calculating; C is according to the dividing method of gamma characteristic and directivity characteristics, utilize Local standard deviation (or variance) and the consistance feature of image, adopt linear classification to cut apart, this method has been considered directivity characteristics and gamma characteristic, multifrequency nature is merged, but the selection of its coefficient is very crucial, and the setting of threshold value is difficulty relatively; D is based on the dividing method of hidden Markov model; E is based on the dividing method of conversion and energy field; Method d and method e have considered many factors, but the algorithm computational complexity is larger, and be low to the low quality fingerprint image treatment effeciency, can not accurately cut apart.
Summary of the invention
The dividing method that the purpose of this invention is to provide a kind of fingerprint image, the method is applied to ISODATA clustering algorithm (iteration Self Organization Analysis algorithm) and morphological images disposal route in the Fingerprint Image Segmentation, first fingerprint image is carried out cutting, if the fingerprint image contrast is lower, then image is carried out equalization processing, then image is carried out top cap conversion, compensate inhomogeneous background luminance, with the ISODATA cluster image is carried out piecemeal at last and cut apart, morphological images is processed.
Concrete steps are:
(1) read in fingerprint image, determine a minute block size W according to image resolution ratio resolution, if resolution 600dpi, if W=30 then is resolution<400 dpi, then W=8, otherwise the W acquiescence equals 16, and fingerprint image is converted to double class image img.
(2) the double class image img of step (1) gained carried out Fast trim:
A. since the 1st row, capable every x, calculate the difference diff (i) of the capable maximum gradation value of i and minimum gradation value; I=1+kx wherein, k is nonnegative integer,
M is the line number of image, i≤m, and i rounds with the floor function;
B. obtain the maximal value diffmax of the difference diff (i) of all maximum gradation value and minimum gradation value;
C. the larger calculating row diffd(of difference that finds out maximum gradation value and minimum gradation value gets the difference of maximum gradation value and minimum gradation value greater than the row of diffmax/3);
D. find the larger begin column mb of difference, from the first calculating row beginning that step (2) c found out the step, if the difference of continuous two calculating row is all larger, determines that begin column is last calculating row (being not less than 1) of this calculating row, otherwise seek backward;
E. find out the larger end line me of difference, last that find out from step (2) c go on foot calculates row to begin, if the difference that continuous two calculating are gone is all larger, then end line is that this rear calculating of calculating row is gone (being not more than m), otherwise forward searching;
F. the method by step a ~ e finds the larger begin column nb of difference and end column ne;
G. end line me and end column ne are adjusted, make cutting after image be of a size of minute integral multiple of block size W, original image img is carried out cutting, obtain image img1 after the cutting, the image size is m1*n1 after the cutting, m1=me-mb wherein, n1=ne-nb.
(3) inverse conversion:
A. the average gray avgbound of pixel around the computed image img1 namely calculates the first row, last column, and first row is listed as the average gray of all pixels with last;
If b. background is brighter, i.e. avgbound〉0.5, then carry out inverse conversion img1=1-img1, otherwise jump to step (4).
(4) equalization;
A. the average gray of computed image img1
B. the standard deviation of computed image
C. image histogram equalization is if std1<T1(T1 gets 0.11), then carry out the image histogram equalization, otherwise jump to step (5).
(5) top cap conversion;
A., it is that radius is the circle of W/2 that structural element is set;
B. image img1 is carried out top cap conversion, obtain image img2.
(6) piecemeal calculated characteristics amount;
A. the fritter imgb that image img2 is divided into the non-overlapping copies of W*W size, the calculated characteristics amount;
B. computing block gray average avgb:
C. computing block standard deviation stdb:
In the formula, n1 is gray-scale value counting more than or equal to piece gray average avgb in the piece, n2 is gray-scale value counting less than piece gray average avgb in the piece, t1 is the had some gray-scale value sum of gray-scale value in the piece more than or equal to piece gray average avgb, and t2 is the had some gray-scale value sum of gray-scale value in the piece less than piece gray average avgb;
E. computing block direction consistance cohb:
In the formula,
S
x, S
yBe the Sobel operator.
(7) piecemeal is cut apart;
A. determine respectively four characteristic quantity bound up_feature and low_feature;
up_feature= min{0.9,maxfeature-difffeature}
low_feature= min{0.1,minfeature+difffeature} (8)
In the formula, difffeature=(maxfeature-minfeature)/10, maxfeature are the maximal value of all block feature amounts, and minfeature is the minimum value of all block feature amounts;
B. determine initial background piece class and initial background piece class center.When certain characteristic quantity is the initial background piece less than its corresponding lower prescribing a time limit.The piece number of initial background piece is more than or equal to 1.Initial background class center is the four-dimensional vector that the mean value of all initial background block feature amounts forms;
C. determine initial foreground blocks class and initial foreground blocks class center.When all characteristic quantities all are initial foreground blocks greater than its corresponding upper prescribing a time limit.The four-dimensional vector that the mean value that initial foreground blocks class center is all initial foreground blocks characteristic quantities forms.If do not find initial foreground blocks, namely the piece number of initial foreground blocks is 0, and so initial foreground blocks class center is the four-dimensional vector that four characteristic quantity upper limits form;
D. piece is determined at the end of each non-initial foreground blocks and non-initial background piece, calculated respectively four characteristic quantities to the distance of four components at foreground blocks class center and background piece class center, i.e. Euclidean distance;
If e. all greater than the twice to the distance at background piece class center, then this piece is the background piece to the distance at foreground blocks class center for four characteristic quantities; If all greater than the twice to the distance at foreground blocks class center, then this piece is foreground blocks to the distance at background piece class center for four characteristic quantities; The piece of other situation for temporarily determining;
F. calculate respectively the center of foreground blocks class and background piece class.Background piece class center is four-dimensional vectorial for that have powerful connections, block feature amount mean value formed.Foreground blocks class center is the four-dimensional vector that the mean value of all foreground blocks characteristic quantities forms.If do not find foreground blocks, then foreground blocks class center is the four-dimensional vector that four characteristic quantity upper limits form;
G. with new cluster centre and old cluster centre relatively, if distance is made as 0.01 less than threshold value T2() then stop, otherwise, take new cluster centre as benchmark, return steps d.
(8) morphological images is processed:
A. to image img1, calculate the average gray avgback at the background piece place that piecemeal is partitioned into, if background is darker, namely the inverse conversion is carried out in avgback<0.5, namely y=1-img1 replaces background place gray-scale value with background place average gray.;
B. number of processes n is initialized as 1;
C. the structural element with the 5*5 size corrodes image y, strengthen (square), find regional mask msk with OTSU method (maximum variance between clusters), msk is negated, remove less object;
D. the structural element with the 7*7 size corrodes regional mask msk, fills hole, and number of processes n adds 1, if step c is returned in n≤4, otherwise execution in step e;
E. excessive for preventing boundary segmentation, the segmentation result outer boundary is enlarged W/2, obtain final segmentation result msk.
(9) fingerprint image after obtaining cutting apart:
The effect of described step (2) is that non-finger-print region is removed, and reduces the time of subsequent treatment, adopts the interval several rows to calculate, and has accelerated processing speed.
Described step (3) is only implemented the brighter image of background, and its effect is that to change fingerprint image into background dark, and the image that prospect is bright is so that step (5) is implemented top cap conversion.
Described step (4) is only implemented the low image of contrast, and its effect is that the gray scale spacing of image is pulled open, and makes intensity profile even, increases contrast, makes image detail clear.
The effect of described step (5) is the inhomogeneous background luminance of compensation.
Four characteristic quantities such as described step (6) piecemeal computing block gray average, piece standard deviation, piece grey-scale contrast and piece direction consistance, the foundation of cutting apart as step (7) piecemeal.
Described step (7) adopts the ISODATA clustering algorithm, value according to step (6) characteristic quantity is set initial foreground blocks and initial background piece, carry out cluster take the average of initial foreground blocks and initial background piece as initial cluster center, the result of cluster has three kinds: foreground blocks, background piece, the piece that temporarily can't determine, only the end is determined that piece calculates, judges during cluster, the cluster speed.
Described step (8) uses the morphology disposal route according to pixels to cut apart, image is carried out burn into to be strengthened, with maximum variance between clusters regional mask is carried out binaryzation, deletion small object and hole, for preventing the border over-segmentation, the segmentation result outer boundary is enlarged W/2, obtain final segmentation result msk, this border does not affect subsequent treatment.
Different from existing method, the dividing method of fingerprint image of the present invention have a following advantage:
(1) the present invention is also applicable to second-rate fingerprint image, can correctly cut apart, and higher reliability is arranged;
(2) the present invention adopts the ISODATA clustering algorithm, carries out piecemeal and cuts apart, the cluster speed; Adopt Fast trim, reduced the processing time;
(3) the present invention adopts piece to cut apart with pixel segmentation to combine, and the fingerprint profile that is partitioned into is smoother;
(4) the present invention adopts image equalization and top cap transfer pair image to strengthen, make cut apart more effective.
Description of drawings
Fig. 1 is fingerprint segmentation method flow diagram of the present invention.
Fig. 2 is the fingerprint image of the embodiment of the invention.
Among the figure: (a) be original image FVC2004db3 103_5.GIF; (b) be the image behind (a) Fast trim; (c) be image after the cap conversion of (b) top; (d) be (c) piecemeal segmentation result, black is the background piece; (e) be the conversion of (b) inverse and basis (d) replace the background place with background place average gray image; (f) be that (e) carries out the image mask that the morphology processing obtains; (g) be (f) expand to the original image size with (a) with computing after image.
Fig. 3 is block feature amount of the present invention, is the decimal between 0 ~ 1, and wherein the most black is 0, is 1 the most in vain.
Among the figure: (a) piece gray average avgb; (b) piece standard deviation stdb; (c) piece grey-scale contrast zb; (d) piece direction consistance cohb.
Embodiment
Embodiment:
Method of the present invention is to move under Windows XP environment, realizes with the Matlab language, and its step is:
(1) use the imread function to read in fingerprint image FVC2004db3 103_5.GIF (type of collector is the heat scraping), use the imfinfo function to obtain image resolution ratio resolution, determine a minute block size W=16, be double class image img with image transitions, the image size is 480*300, m=480, n=300 is such as Fig. 2 (a).
(2) image img is carried out Fast trim, x=21.9089 calculates respectively the 1st, 22,44,66,88,110,132,154,176,198,220 ... the maximum gradation value of 461 row and the difference diff of minimum gradation value (i), maximal value diffmax=0.3137, mb=44, me=454, nb=18, ne=300, and be the integral multiple of W with adjusted size, me=443, ne=289, obtain image img1 after the cutting, the image size is 400*272, such as Fig. 2 (b).
(3) pixel average avgbound=0.4009 around the computed image img1, step (4) is jumped in avgbound<0.5.
(4) the standard deviation std1=0.3201 of computed image img1, std1〉0.11, jump to step (5).
(5) use function strel to create radius and be the morphological structuring elements of the circle of W/2=8 size, use function imtophat that image img1 is carried out top cap conversion, obtain image img2, such as Fig. 2 (c).
(6) to image img2 piecemeal computing block gray average avgb, piece standard deviation stdb, piece grey-scale contrast zb, piece direction consistance cohb, as shown in Figure 3.
(7) determine piece gray average bound 0.5018,0.0558,, standard deviation bound 0.4248,0.0472, piece grey-scale contrast bound 0.8380,0.0931, piece direction consistance bound 0.8684,0.0965, initial background piece class center is (0.0343,0.0260,0.0439,0.3199), initial foreground blocks class center is (0.4483,0.4464,0.8646,0.9166), use the ISODATA clustering algorithm to find out part background piece, namely obtaining piecemeal segmentation result mskback, is the part background piece of finding out such as black block among Fig. 2 (d).
(8) to image img1, according to mskback, calculate the average gray avgback=0.3090 of background place that piecemeal is partitioned into, image is carried out the inverse conversion, and background place gray-scale value is replaced with 1-avgback, obtain image y, such as Fig. 2 (e); Use function imerode, with the structural element of 5*5 size image y is corroded, square, find regional mask msk with the OTSU method, negate, remove small object; Structural element with the 7*7 size corrodes regional mask msk, fills hole with function imfill, enlarges W/2=8 again, obtains final mask msk, such as Fig. 2 (f).
(9) mask is expanded to original image size 480*300, the output segmentation effect, such as Fig. 2 (g), black is the background that is partitioned into.
Claims (1)
1. the dividing method of a fingerprint image is characterized in that concrete steps are:
(1) read in fingerprint image, determine a minute block size W according to image resolution ratio resolution, if resolution 600dpi, if W=30 then is resolution<400dpi, then W=8, otherwise the W acquiescence equals 16, and fingerprint image is converted to double class image img;
(2) the double class image img of step (1) gained carried out Fast trim:
A. since the 1st row, capable every x, calculate the difference diff (i) of the capable maximum gradation value of i and minimum gradation value, i=1+kx wherein, k is nonnegative integer,
M is the line number of image, i≤m, and i rounds with the floor function;
B. obtain the maximal value diffmax of the difference diff (i) of all maximum gradation value and minimum gradation value;
C. find out the larger calculating row diffd of difference of maximum gradation value and minimum gradation value---get the difference of maximum gradation value and minimum gradation value greater than the row of diffmax/3;
D. find the larger begin column mb of difference, from the first calculating row beginning that step (2) c found out the step, if the difference of continuous two calculating row is all larger, determine that begin column is last calculating row of this calculating row, is not less than 1, otherwise seeks backward;
E. find out the larger end line me of difference, last that find out from step (2) c go on foot calculates row to begin, if the difference that continuous two calculating are gone is all larger, then end line is that this rear calculating of calculating row is gone, and is not more than m, otherwise forward searching;
F. the method by step a ~ e finds the larger begin column nb of difference and end column ne;
G. end line me and end column ne are adjusted, make cutting after image be of a size of minute integral multiple of block size W, original image img is carried out cutting, obtain image img1 after the cutting, the image size is m1*n1 after the cutting, m1=me-mb wherein, n1=ne-nb;
(3) inverse conversion:
A. the average gray avgbound of pixel around the computed image img1 namely calculates the first row, last column, and first row is listed as the average gray of all pixels with last;
If b. background is brighter, i.e. avgbound〉0.5, then carry out inverse conversion img1=1-img1, otherwise jump to step (4);
(4) equalization:
C. image histogram equalization, if std1<T1, T1 gets 0.11, then carries out the image histogram equalization, otherwise jumps to step (5);
(5) top cap conversion:
A., it is that radius is the circle of W/2 that structural element is set;
B. image img1 is carried out top cap conversion, obtain image img2;
(6) piecemeal calculated characteristics amount:
A. the fritter imgb that image img2 is divided into the non-overlapping copies of W*W size, the calculated characteristics amount;
In the formula, n1 is gray-scale value counting more than or equal to piece gray average avgb in the piece, n2 is gray-scale value counting less than piece gray average avgb in the piece, t1 is the had some gray-scale value sum of gray-scale value in the piece more than or equal to piece gray average avgb, and t2 is the had some gray-scale value sum of gray-scale value in the piece less than piece gray average avgb;
S
x, S
yBe the Sobel operator;
(7) piecemeal is cut apart:
A. determine respectively four characteristic quantity bound up_feature and low_feature;
up_feature=min{0.9,maxfeature-difffeature}
low_feature=min{0.1,minfeature+difffeature} (8)
In the formula, difffeature=(maxfeature-minfeature)/10, maxfeature are the maximal value of all block feature amounts, and minfeature is the minimum value of all block feature amounts;
B. determine initial background piece class and initial background piece class center, when certain characteristic quantity is the initial background piece less than its corresponding lower prescribing a time limit, the piece number of initial background piece is more than or equal to 1, and initial background class center is the four-dimensional vector that the mean value of all initial background block feature amounts forms;
C. determine initial foreground blocks class and initial foreground blocks class center, when all characteristic quantities all are initial foreground blocks greater than its corresponding upper prescribing a time limit, the four-dimensional vector that the mean value that initial foreground blocks class center is all initial foreground blocks characteristic quantities forms, if do not find initial foreground blocks, the piece number that is initial foreground blocks is 0, and so initial foreground blocks class center is the four-dimensional vector that four characteristic quantity upper limits form;
D. piece is determined at the end of each non-initial foreground blocks and non-initial background piece, calculated respectively four characteristic quantities to the distance of four components at foreground blocks class center and background piece class center, i.e. Euclidean distance;
If e. all greater than the twice to the distance at background piece class center, then this piece is the background piece to the distance at foreground blocks class center for four characteristic quantities; If all greater than the twice to the distance at foreground blocks class center, then this piece is foreground blocks to the distance at background piece class center for four characteristic quantities; The piece of other situation for temporarily determining;
F. calculate respectively the center of foreground blocks class and background piece class, background piece class center is four-dimensional vectorial for that have powerful connections, block feature amount mean value formed, foreground blocks class center is the four-dimensional vector that the mean value of all foreground blocks characteristic quantities forms, if do not find foreground blocks, then foreground blocks class center is the four-dimensional vector that four characteristic quantity upper limits form;
G. with new cluster centre and old cluster centre relatively, if distance less than threshold value T2 then stop, T2 is made as 0.01, otherwise, take new cluster centre as benchmark, return steps d;
(8) morphological images is processed:
A. to image img1, calculate the average gray avgback at the background piece place that piecemeal is partitioned into, if background is darker, namely the inverse conversion is carried out in avgback<0.5, namely y=1-img1 replaces background place gray-scale value with background place average gray;
B. number of processes n is initialized as 1;
C. the structural element with the 5*5 size corrodes image y, strengthens---square, use the OTSU method, namely maximum variance between clusters finds regional mask msk, and msk is negated, and removes less object;
D. the structural element with the 7*7 size corrodes regional mask msk, fills hole, and number of processes n adds 1, if step c is returned in n≤4, otherwise execution in step e;
E. excessive for preventing boundary segmentation, the segmentation result outer boundary is enlarged W/2, obtain final segmentation result msk;
(9) fingerprint image after obtaining cutting apart.
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