CN106203358A - A kind of iris locating method and equipment - Google Patents
A kind of iris locating method and equipment Download PDFInfo
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- CN106203358A CN106203358A CN201610556166.0A CN201610556166A CN106203358A CN 106203358 A CN106203358 A CN 106203358A CN 201610556166 A CN201610556166 A CN 201610556166A CN 106203358 A CN106203358 A CN 106203358A
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- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/18—Eye characteristics, e.g. of the iris
- G06V40/193—Preprocessing; Feature extraction
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Abstract
The invention discloses a kind of iris locating method and equipment, including: iris authentication system obtains iris image, comprises iris to be positioned, pupil in described iris image；Determining the position of hot spot in described pupil, described hot spot is injected described pupil by external light source and is formed；Position according to described hot spot and the half-tone information of described iris image, determine in described iris image for characterizing the first border circle and the second boundary circle of described iris position to be positioned, described first border circle comprises the center of circle and the radius of described first border circle, and described the second boundary circle comprises the center of circle and the radius of described the second boundary circle；According to described first border circle and described the second boundary circle, position the iris in described iris image.So iris authentication system can be according to the half-tone information of the iris image got, and by image processing techniques simply and curve fitting algorithm, quickly orients the position of iris in iris image, improves the work efficiency of iris authentication system.
Description
Technical field
The present invention relates to technical field of image processing, particularly relate to a kind of iris locating method and equipment.
Background technology
Iris recognition technology is a kind of biometrics identification technology, has uniqueness, stability, safety and untouchable
Etc. advantage, it is study hotspot and the development trend in living things feature recognition field.
Iris authentication system mainly includes the steps such as the extraction of image acquisition, Image semantic classification, iris feature and characteristic matching.
First, iris authentication system carries out image acquisition, obtains the eye image comprising iris image.
Secondly, iris authentication system carries out Image semantic classification to eye image, determines the position of iris in eye image.Tool
Body ground, iris is a part for eye structure, between pupil and sclera, by the eye image got is carried out image
Segmentation, and then determine the position of iris in eye image.
Again, iris authentication system, according to the position of the iris determined, extracts the texture feature information of iris.
Finally, the texture feature information of the iris extracted is mated with fixed form, obtain iris identification result.
As can be seen here, the committed step during Iris Location is iris authentication system.The position being accurately positioned iris can be true
Protect texture feature information complete of subsequent extracted iris, and then ensure iris identification result.
But, traditional iris locating method comprises the circular operator Iris-orientation Algorithm of Daugman and based on edge inspection
The Hough transform Iris-orientation Algorithm etc. surveyed.
The circular operator Iris-orientation Algorithm of Daugman is a kind of to carry out Iris Location based on circle detection adapter
Algorithm, it is possible to accurately detect out the position of iris, but the eye image prescription that the algorithm of Daugman is to collecting
High so that the time that Iris Location process is consumed is longer, reduces the work efficiency of iris authentication system.
Hough transform Iris-orientation Algorithm based on rim detection is mainly by using edge detection operator to extract pupil respectively
Hole and the marginal information of the marginal information of iris, iris and sclera, and then use Hough changing method to determine the position of iris.
But, comprise the interference factor such as eyelashes, eyelid due in the eye image that gets, therefore, when Hough transform, amount of calculation is relatively
Greatly, the time causing Iris Location process to consume is longer, still reduces the work efficiency of iris authentication system.
As can be seen here, need a kind of iris locating method badly, for solving the Iris Location in existing iris authentication system
During the relatively low problem of the work efficiency of the time longer iris authentication system caused that consumes.
Summary of the invention
In view of this, the embodiment of the present invention provides a kind of iris locating method and equipment, is used for solving existing iris and knows
The problem that during Iris Location in other system, the work efficiency of the time longer iris authentication system caused of consumption is relatively low.
The embodiment of the present invention provides a kind of iris locating method, including:
Obtain iris image, described iris image comprises iris to be positioned, pupil；
Determining the position of hot spot in described pupil, described hot spot is injected described pupil by external light source and is formed；
Position according to described hot spot and the half-tone information of described iris image, determine in described iris image for table
Levying the first border circle and the second boundary circle of described iris position to be positioned, described first border circle comprises described the
The center of circle of one border circle and radius, described the second boundary circle comprises the center of circle and the radius of described the second boundary circle；
According to described first border circle and described the second boundary circle, position the iris in described iris image.
The present invention implements a kind of Iris Location equipment of offer, including:
Acquiring unit, is used for obtaining iris image, comprises iris to be positioned, pupil in described iris image；
First determines unit, and the position of the hot spot in determining described pupil, described hot spot is injected institute by external light source
State pupil to be formed；
Second determines unit, for the position according to described hot spot and the half-tone information of described iris image, determines institute
State for characterizing the first border circle and the second boundary circle of described iris position to be positioned in iris image, described the
One border circle comprises the center of circle and the radius of described first border circle, and described the second boundary circle comprises the center of circle of described the second boundary circle
And radius；
Positioning unit, for according to described first border circle and described the second boundary circle, positioning in described iris image
Iris.
The present invention has the beneficial effect that:
The technical scheme that the embodiment of the present invention provides, iris authentication system obtains iris image, wraps in described iris image
Containing iris to be positioned, pupil；Determining the position of hot spot in described pupil, described hot spot is injected described pupil by external light source
Formed；Position according to described hot spot and the half-tone information of described iris image, determine in described iris image for characterizing
First border circle of described iris position to be positioned and the second boundary circle, described first border circle comprises described first
The center of circle of border circle and radius, described the second boundary circle comprises the center of circle and the radius of described the second boundary circle；According to described first
Border circle and described the second boundary circle, position the iris in described iris image.So iris authentication system can be according to acquisition
The half-tone information of the iris image arrived, by image processing techniques simply and curve fitting algorithm, in iris image quickly
Orient the position of iris, improve the work efficiency of iris authentication system.
Accompanying drawing explanation
For the technical scheme being illustrated more clearly that in the embodiment of the present invention, in embodiment being described below required for make
Accompanying drawing briefly introduce, it should be apparent that, below describe in accompanying drawing be only some embodiments of the present invention, for this
From the point of view of the those of ordinary skill in field, on the premise of not paying creative work, it is also possible to obtain it according to these accompanying drawings
His accompanying drawing.
The schematic flow sheet of a kind of iris locating method that Fig. 1 provides for the embodiment of the present invention；
The facula position schematic diagram that Fig. 2 provides for the embodiment of the present invention；
The schematic diagram of the pixel of the first border circle that Fig. 3 provides for the embodiment of the present invention；
The determination result schematic diagram of the first border circle that Fig. 4 provides for the embodiment of the present invention；
The rectangular area schematic diagram of the determination the second boundary circle that Fig. 5 provides for the embodiment of the present invention；
In the same one-row pixels that Fig. 6 provides for the embodiment of the present invention between the center of circle of two pixels and the first border circle
Position relationship schematic diagram；
The determination result schematic diagram of the second boundary circle that Fig. 7 provides for the embodiment of the present invention；
The structural representation of a kind of Iris Location equipment that Fig. 8 provides for the embodiment of the present invention.
Detailed description of the invention
In iris authentication system, Iris Location is the key of iris recognition technology.The external boundary of iris is adjacent with sclera,
Being approximately circular, the inner boundary of iris is adjacent with pupil, is also approximately at circle, and therefore, iris is between pupil and sclera
Area.The purpose of Iris Location be to determine the center of circle of iris inner boundary circle, radius and the center of circle of external boundary circle,
Radius, this makes it possible to the position of precise positioning iris.
After iris authentication system gets the iris image comprising iris, position the position of iris according to iris image
Put.Owing to iris image comprising the interference factor such as eyelashes, eyelid, and in some iris image, between iris and sclera
Border inconspicuous, the location of exterior iris boundary can be impacted by these.
In iris authentication system, there is important impact exterior iris boundary location on the discrimination of iris identification.Outside iris
Boundary alignment is excessive, will iris external boundary circle navigated to inside sclera, cause one when Iris Texture Features Extraction
Part sclera texture extracts as iris texture characteristic, affects last recognition result；Exterior iris boundary location is too small, rainbow
The texture feature information of film extracts not exclusively, the recognition result that same impact is last.
In order to obtain Iris Location result accurately, existing Iris Location technology uses complicated Iris-orientation Algorithm to enter
Row iteration calculates, and causes Iris Location the longest, and the work efficiency causing iris authentication system is relatively low.
In order to realize the purpose of the present invention, embodiments providing a kind of iris locating method and equipment, iris is known
Other system obtains iris image, comprises iris to be positioned, pupil in described iris image；Determine hot spot in described pupil
Position, described hot spot is injected described pupil by external light source and is formed；Position according to described hot spot and described iris image
Half-tone information, determines in described iris image for characterizing the first border circle and the of described iris position to be positioned
Two border circles, described first border circle comprises the center of circle and the radius of described first border circle, and described the second boundary circle comprises described
The center of circle of the second boundary circle and radius；According to described first border circle and described the second boundary circle, position in described iris image
Iris.So iris authentication system can be according to the half-tone information of the iris image got, by image procossing simply
Technology and curve fitting algorithm, quickly locate out the position of iris in iris image, improves the work of iris authentication system
Efficiency.
Below in conjunction with Figure of description, each embodiment of the present invention is described in further detail, it is clear that described
Embodiment is only a part of embodiment of the present invention rather than whole embodiments.Based on the embodiment in the present invention, this area
All other embodiments that those of ordinary skill is obtained under not making creative work premise, broadly fall into present invention protection
Scope.
Embodiment 1
The schematic flow sheet of a kind of iris locating method that Fig. 1 provides for the embodiment of the present invention, described method can be as follows
Shown in.
Step 101: obtain iris image.
Wherein, described iris image comprises iris to be positioned, pupil.
In a step 101, iris authentication system is first carried out image acquisition operations, obtains iris image, and then to acquisition
To described iris image process, position the iris in described iris image.
In actual applications, the iris image that described iris authentication system gets can be to comprise described rainbow to be positioned
The eye image of film, in order to make it easy to understand, be referred to as iris image by described eye image.
Step 102: determine the position of hot spot in described pupil.
Wherein, described hot spot is injected described pupil by external light source and is formed.
In a step 102, in iris authentication system, in order to obtain more preferable iris texture characteristic information, obtaining rainbow
During film image, need to use external light source to carry out light filling.The hot spot formed in order to avoid external light source falls at iris region to rainbow
The covering of the texture feature information of film, can make described hot spot fall in pupil.Such as, Fig. 2 provides for the embodiment of the present invention
Facula position schematic diagram.
It should be noted that in order to avoid eyes being damaged when image acquisition, permissible when iris image acquisition
Using wavelength is that the infrared light supply of 850nm is to carry out light filling, it would however also be possible to employ other light sources, is not specifically limited here.
Due to external light source formed described hot spot be positioned at inside described pupil, it is thus determined that the position of described hot spot it
After, the position range of described pupil can be determined roughly according to the position of described hot spot.
Preferably, determine the position of hot spot in described pupil, including:
Threshold value according to setting carries out binary conversion treatment to described iris image；
According to the iris image after described binary conversion treatment, from the iris image after described binary conversion treatment, detect light
Speckle connected domain；
In described iris image, according to the grey value profile around the described hot spot connected domain detected, determine described
The position of hot spot.
It should be noted that refer to described hot spot connected domain center as the center of circle around described hot spot connected domain, to set
Definite value be radius circle in remove the region of described hot spot connected domain.
In described iris image, compared with the gray value of described pupil, the gray value of the described hot spot in described pupil
Higher.Therefore, the gray threshold according to setting carries out binary conversion treatment to described iris image, and the gray threshold of described setting is
First threshold.
In the iris image after binary conversion treatment, show white, less than institute higher than the part of described first threshold
State the part display black of first threshold.
The gray value of described hot spot is higher than the gray value of described pupil, the therefore iris image after described binary conversion treatment
In, the region of display white belongs to hot spot connected domain.
In actual applications, when using the irradiation of described external light source to carry out light filling, interference factor is waited due to reflective so that
In the described iris image got, in addition to the gray value of described hot spot part is higher, there is also other gray value relatively
High region, therefore after described iris image is carried out binary conversion treatment, can detect at least one hot spot connected domain.
Described hot spot is positioned at inside described pupil, and the gray value of described hot spot is higher than the gray value of described pupil, because of
This, have bigger Gray Level Jump between the gray value of the described pupil around the gray value of described hot spot and described hot spot.
In described iris image, according to the grey value profile around at least one hot spot connected domain described in detecting,
The position of described hot spot is determined at least one hot spot connected domain described.
If the gray value around described hot spot connected domain is in the tonal range set, it is determined that described hot spot connected domain
Position be the position of described hot spot.
If the gray value around described hot spot connected domain is not in the tonal range set, it is determined that described hot spot connects
The position in territory is not the position of described hot spot, but waits interference factor to cause due to reflective.
Described hot spot is positioned at inside described pupil, therefore, according to the position of the described hot spot determined, can determine roughly institute
State the position range of pupil.
Described iris to be positioned is between described pupil and described sclera, therefore according to the described pupil determined roughly
Position range, can quickly position the position of described iris in subsequent process, it is to avoid the time wave that blind search causes
Take.
Step 103: according to position and the half-tone information of described iris image of described hot spot, determine described iris image
In for characterize described iris position to be positioned first border circle and the second boundary circle.
Wherein, described first border circle comprises the center of circle and the radius of described first border circle, and described the second boundary circle comprises
The center of circle of described the second boundary circle and radius.
Described iris image comprises described iris to be positioned, pupil, sclera, for characterizing described iris to be positioned
First border circle of position is adjacent with described pupil, for characterizing the second boundary of described iris position to be positioned
Circle is adjacent with described sclera.
In described iris image, owing to described hot spot is positioned at described pupil, described first border circle and described pupil
Adjacent, the gray value of described iris is higher than the gray value of described pupil, therefore according to the position of the described hot spot determined in step 102
Put and the half-tone information of described iris image, it may be determined that for characterizing described iris institute to be positioned in described iris image
The first border circle in position.
Preferably, according to position and the half-tone information of described iris image of described hot spot, described iris image is determined
In for characterize described iris position to be positioned first border circle, including:
According to the position of described hot spot, described hot spot is filled with；
According to the position of the described hot spot after filling, described iris image is chosen setting row pixel；
According to the gray value of described setting row pixel, determine that the gray value being positioned at spot center both sides in every one-row pixels is jumped
Become maximum pixel；
Use method of least square that described pixel is carried out curve fitting, determine the center of circle and half of described first border circle
Footpath.
Gray value due to described iris is higher than the gray value of described pupil, and the gray value of described hot spot is also above described pupil
The gray value in hole, therefore, in order to avoid the determination of described first border circle is interfered by described hot spot, need determine described
Before first border circle, described hot spot is filled with.
Filling to described hot spot can use morphological erosion and image reconstruction algorithm, is not specifically limited here.
The schematic diagram of the pixel of the first border circle that Fig. 3 provides for the embodiment of the present invention.
According to the position of the described hot spot after filling, with described spot center as starting point, choose n row the most up and down
Pixel.
According to the gray value of each pixel in described 2n row pixel, in every one-row pixels of described 2n row pixel,
Search the pixel of the gray value saltus step maximum being positioned at spot center both sides in described every one-row pixels, namely described first border
The boundary point of circle.
The maximum pixel of described gray value saltus step refer to the gray value between adjacent two pixels difference (or
Difference absolute value) more than Second Threshold time, the pixel that in these adjacent two pixels, gray value is big.
Owing to described first border circle is adjacent with described pupil, described the second boundary circle is adjacent with described sclera, described Gong
The gray value of film is higher than the gray value of described iris, and the gray value of described iris is higher than the gray value of described pupil, therefore, in institute
State the saltus step that gray value all can occur at the first border circle and described first border circle.
Determining described first border bowlder, in order to avoid the impact of Gray Level Jump at described the second boundary circle, with
Described spot center is in the described n row pixel that starting point is chosen the most up and down, can comprise described in every one-row pixels
Pixel in pupil and the partial pixel point in described iris, do not comprise described intrascleral pixel.
Therefore, the number of the pixel in every one-row pixels in the described setting row pixel chosen can be rule of thumb
Set in advance, it is not specifically limited here.
Such as, in certain one-row pixels of described 2n row pixel, 9 pixels are comprised: pixel 1-9, described 9 pixels
Gray value be (52,50,9,10,9,9,8,51,50), described Second Threshold is 20, according to the ash between described 9 pixels
Degree situation of change, it was determined that pixel 2 and pixel 8 are the pixels of gray value saltus step maximum, that is to say described first limit
The boundary point of boundary's circle.
In described 2n row pixel, every one-row pixels can determine the pixel that two gray value saltus steps are maximum.
[x (i), y (i)], i=1,2,3...4n is that 4n the gray value saltus step determined from described 2n row pixel is maximum
Pixel.
For described 4n pixel, use method of least square that described 4n pixel is carried out curve fitting, determine institute
State the center of circle and the radius of the first border circle.
Assume that the equation that described first border is justified is:
(x-xc1)2+(y-yc1)2=r1 2,
Wherein, (xc1,yc1) be described first border circle central coordinate of circle, r1It it is the radius of described first border circle.
Launch the equation of the described first border circle set, obtain following equation:
x2+y2-2xc1x-2yc1y+xc1 2+yc1 2-r1 2=0,
Make a=-2xc1, b=-2yc1, c=xc1 2+yc1 2-r1 2, can obtain:
Ax+by+c=-(x2+y2)。
Described 4n pixel is substituted into above-mentioned formula, and the matrix form obtaining above-mentioned formula is:
OrderThen obtain a young waiter in a wineshop or an inn
The matrix form of multiplication: AC=B.
According to principle of least square method, in the hope of C, namely the value of a, b, c can be obtained.Value according to a, b, c can be in the hope of
Central coordinate of circle and the radius of described first border circle are respectively as follows:
Central coordinate of circle according to described first border circle and radius, i.e. can determine that described first border circle, and Fig. 4 is the present invention
The determination result schematic diagram of the first border circle that embodiment provides.
During it should be noted that carry out curve fitting according to the boundary point of described first border circle, a young waiter in a wineshop or an inn can be used
Multiplication, it would however also be possible to employ other curve fitting algorithm, is not specifically limited here.
Position according to described hot spot and the half-tone information of described iris image, determine in described iris image for table
After levying the first border circle of described iris position to be positioned, and then according to described first border circle and described iris
The half-tone information of image, determines in described iris image for characterizing the second boundary of described iris position to be positioned
Circle.
Preferably, determine in described iris image for characterizing the second boundary of described iris position to be positioned
Circle, including:
According to the center of circle of described first border circle, in described iris image, choose rectangular area；
According to described rectangular area, determine described the second boundary circle.
Compared with described first border circle, the border between described the second boundary circle and described sclera is inconspicuous, Er Qieyou
In there is the interference of the factor such as eyelashes, eyelid, cause the difficulty of iris the second boundary circle location.
Described first border circle is the concentric circular that one group of center of circle is sufficiently close to described the second boundary circle, therefore, according to institute
State the center of circle of the first border circle, below the center of circle of described first border circle, choose rectangular area, and according to described rectangular area,
Determine described the second boundary circle.The rectangular area schematic diagram of the determination the second boundary circle that Fig. 5 provides for the embodiment of the present invention.
It should be noted that the length of described rectangular area and width can be the most set in advance, the most do not do and have
Body limits.
Described rectangular area is positioned at below the center of circle of described first border circle, the center of described rectangular area and described first
Vertical dimension between the center of circle of border circle is the 3rd threshold value.
Owing to the vertical dimension between described first border circle and the center of circle of described the second boundary circle is less than the 4th threshold value, institute
Stating the 3rd threshold value and be more than described 4th threshold value, therefore, described rectangular area is positioned at below the center of circle of described the second boundary circle.So
The impact on determining described the second boundary circle of the interference factor such as eyelashes, eyelid can be avoided.
Preferably, for characterizing the second boundary of described iris position to be positioned in determining described iris image
Before circle, described method also includes:
Described iris image is smoothed；
Iris image after described smoothing processing is carried out histogram equalization process.
In order to determine described the second boundary circle more accurately, before determining described the second boundary circle, first, to described rainbow
Film image uses gaussian filtering to be smoothed cutting down noise, then, carries out the described iris image after smoothing processing
Histogram equalization strengthens the contrast of image.
In described iris image, described the second boundary circle is adjacent with described sclera, and the gray value of described iris is less than institute
State the gray value of sclera, therefore according to described rectangular area and the half-tone information of described iris image, it may be determined that described rainbow
For characterizing the second boundary circle of described iris position to be positioned in film image.
Preferably, according to described rectangular area and the half-tone information of described iris image, determine described the second boundary circle,
Including:
In described rectangular area, choose setting row pixel；
According to the gray value of described setting row pixel, determine the ash being positioned at described first circle both sides, border in every one-row pixels
The pixel that angle value saltus step is maximum；
According to described pixel, determine the boundary point of described the second boundary circle；
Use method of least square that the boundary point of described the second boundary circle is carried out curve fitting, determine described the second boundary circle
The center of circle and radius.
Determining described the second boundary bowlder, in the described setting row pixel chosen, the pixel in every one-row pixels
Number can be the most set in advance, be not specifically limited here.
Specifically, in described rectangular area, choose setting row pixel.According to each pixel in described setting row pixel
The gray value of point, in every a line of described setting row pixel, searches and is positioned at described first border circle in described every one-row pixels
The pixel that the gray value saltus step of both sides is maximum.
In described setting row pixel, every one-row pixels can determine the pixel that two gray value saltus steps are maximum.
Such as: in described rectangular area, have chosen n row pixel, search after terminating, search in described n row pixel and obtain
The pixel that 2n gray value saltus step is maximum, including: the picture that n the gray value saltus step being positioned on the left of described first border circle is maximum
The pixel that vegetarian refreshments, n the gray value saltus step being positioned on the right side of described first border circle is maximum.
Owing to the texture information in described iris region is more, the gray-value variation in described iris region is more complicated,
So in the pixel of the described gray value saltus step maximum found in described setting row pixel, described the second boundary can be comprised
The false edges point of circle, needs according to described pixel, from described pixel, removes the boundary point of described mistake, determine institute
State the correct boundary point of the second boundary circle.
Specifically, according to described pixel, determine the boundary point of described the second boundary circle, including:
For two pictures that the gray value saltus step being positioned at described first circle both sides, border determined in same one-row pixels is maximum
Vegetarian refreshments, determines each pixel horizontal range to the center of circle of described first border circle respectively；
According to described horizontal range, determine the boundary point of described the second boundary circle.
In actual iris image, two boundary points being positioned in same one-row pixels in described the second boundary circle, relatively
It is geometrically symmetric for the center of circle of described the second boundary circle, namely said two boundary point is to the circle of described the second boundary circle
Horizontal range between the heart is equal.
Owing to the horizontal range between the center of circle and the center of circle of described the second boundary circle of described first border circle is less than the 5th
Threshold value.
Therefore, two pixels determined in the colleague mutually in described setting row pixel: be positioned at described first border circle
Pixel that the gray value saltus step in left side is maximum and be positioned at the pixel that the gray value saltus step on the right side of described first border circle is maximum
Point, the difference of the horizontal range between said two pixel to the center of circle of described first border circle is again smaller than the 5th threshold value.
Such as: two pixels and the center of circle of the first border circle in the same one-row pixels that Fig. 6 provides for the embodiment of the present invention
Between position relationship schematic diagram.
Circle in Fig. 6 is the second boundary circle of iris, and some A is the center of circle of the second boundary circle, and some B is the first limit of iris
The center of circle of boundary's circle.Point C is the left margin point of described iris the second boundary circle, and some D is the right margin of described iris the second boundary circle
Point, wherein, some C and some D is positioned in same one-row pixels.
Horizontal range between some C and some D to the center of circle A of described the second boundary circle is equal, some C and some D to described second
Horizontal range between the center of circle A of border circle is all X1mm。
Horizontal range between the center of circle A and the center of circle B of described the second boundary circle of described first border circle is less than X2mm。
As seen from Figure 5, described some C and some D to described first border circle center of circle B between horizontal range difference and
Horizontal range between the center of circle A and the center of circle B of described the second boundary circle of described first border circle is equal.
Therefore, the difference of the horizontal range between described some C and some D to the center of circle B of described first border circle is again smaller than X2mm。
Therefore, in described setting row pixel, for the said two pixel found in same one-row pixels, first,
Determine each described pixel horizontal range to the center of circle of described first border circle respectively, and, determine said two picture
Whether two horizontal ranges in the center of circle that vegetarian refreshments is round to described first border are in set point；Then, it is determined that said two picture
Vegetarian refreshments is to the difference of the horizontal range in the center of circle of described first border circle, and makees to compare by the difference of described horizontal range and the 5th threshold value
Relatively.
When the difference of described horizontal range is less than the 5th threshold value, and said two horizontal range in set point time, really
Determine the boundary point that said two pixel is described the second boundary circle.
When the difference of described horizontal range is more than a horizontal range among the 5th threshold value, and said two horizontal range
In set point, when another horizontal range is not in set point, remove described horizontal range not in set point
Pixel, determines that described horizontal range pixel in set point is the boundary point of described the second boundary circle.
When the difference of described horizontal range is more than the 5th threshold value, and said two horizontal range all in set point time,
Determine that said two pixel is the unknown boundary point of described the second boundary circle.
By said method, described setting row pixel determines boundary point and the unknown boundary of described the second boundary circle
Point.
According to the boundary point of the described the second boundary circle determined, calculate the boundary point of described the second boundary circle to described first
The average level distance in the center of circle of border circle.
Described unknown boundary point is made to the horizontal range in the center of circle of described first border circle with described average level distance
Relatively.
When horizontal range and the described average level of described unknown boundary point to the center of circle of described first border circle is apart from it
When difference is less than six threshold values, determine that described unknown boundary point is the boundary point of described the second boundary circle.
According to said method, both sides can be justified according to described first border that is positioned at determined from described setting row pixel
The pixel that gray value saltus step is maximum, determines the boundary point of described the second boundary circle.
Use method of least square that the boundary point of described the second boundary circle is carried out curve fitting, determine described the second boundary circle
The center of circle and radius.
Such as, according to the gray value saltus step of the described first circle both sides, border of being positioned at of determining from described setting row pixel
Big pixel, it is determined that n boundary point of described the second boundary circle, [x (j), y (j)], j=1,2,3...n.
For n boundary point of described the second boundary circle, use method of least square that described n boundary point is carried out curve plan
Close, determine the center of circle and the radius of described the second boundary circle.
Assume that the equation that described the second boundary is justified is:
(x-xc2)2+(y-yc2)2=r2 2,
Wherein, (xc2,yc2) be described the second boundary circle central coordinate of circle, r2It it is the radius of described the second boundary circle.
Launch the equation of the described the second boundary circle set, obtain following equation:
x2+y2-2xc2x-2yc2y+xc2 2+yc2 2-r2 2=0.
Make d=-2xc1, e=-2yc1, f=xc1 2+yc1 2-r1 2, can obtain:
Dx+ey+f=-(x2+y2)。
Described n boundary point is substituted into above-mentioned formula, and the matrix form obtaining above-mentioned formula is:
OrderThen obtain method of least square
Matrix form: DF=E.
According to principle of least square method, in the hope of F, namely the value of d, e, f can be obtained.Value according to d, e, f can be in the hope of
Central coordinate of circle and the radius of described the second boundary circle are respectively as follows:
Central coordinate of circle according to described the second boundary circle and radius, i.e. can determine that described the second boundary circle, and Fig. 7 is the present invention
The determination result schematic diagram of the second boundary circle that embodiment provides.
During it should be noted that carry out curve fitting according to the boundary point of described the second boundary circle, a young waiter in a wineshop or an inn can be used
Multiplication, it would however also be possible to employ other curve fitting algorithm, is not specifically limited here.
Step 104: according to described first border circle and described the second boundary circle, position the iris in described iris image.
At step 104, according to step 103 determine in described iris image for characterizing described iris to be positioned
First border circle of position and the second boundary circle, can position the iris in described iris image.
Specifically, according to described first border circle and described the second boundary circle, the iris in described iris image is positioned, bag
Include:
Annular region between described first border circle and described the second boundary circle is orientated as in described iris image
The position of iris.
It should be noted that described first threshold to the 6th threshold value can be rule of thumb to preset respectively, here this
In be not specifically limited.
The technical scheme that the embodiment of the present invention provides, iris authentication system obtains iris image, wraps in described iris image
Containing iris to be positioned, pupil；Determining the position of hot spot in described pupil, described hot spot is injected described pupil by external light source
Formed；Position according to described hot spot and the half-tone information of described iris image, determine in described iris image for characterizing
First border circle of described iris position to be positioned and the second boundary circle, described first border circle comprises described first
The center of circle of border circle and radius, described the second boundary circle information comprises the center of circle and the radius of described the second boundary circle；According to described
First border circle and described the second boundary circle, position the iris in described iris image.So iris authentication system can basis
The half-tone information of the iris image got, by image processing techniques simply and curve fitting algorithm, at described iris figure
Quickly locate out the position of iris in Xiang, improve the work efficiency of described iris authentication system.
Embodiment 2
The structural representation of a kind of Iris Location equipment that Fig. 8 provides for the embodiment of the present invention, described Iris Location equipment
Including: acquiring unit 801, first determine unit 802, second determine unit 803, positioning unit 804, wherein:
Acquiring unit 801, is used for obtaining iris image, comprises iris to be positioned, pupil in described iris image；
First determines unit 802, and the position of the hot spot in determining described pupil, described hot spot is injected by external light source
Described pupil is formed；
Second determines unit 803, for the position according to described hot spot and the half-tone information of described iris image, determines
For characterizing the first border circle and the second boundary circle of described iris position to be positioned in described iris image, described
First border circle comprises the center of circle and the radius of described first border circle, and described the second boundary circle comprises the circle of described the second boundary circle
The heart and radius；
Positioning unit 804, for according to described first border circle and described the second boundary circle, positioning in described iris image
Iris.
In another embodiment of the invention, described second determines that unit 803 is according to the position of described hot spot and described
The half-tone information of iris image, determines in described iris image for characterizing the first limit of described iris position to be positioned
Boundary's circle, including:
According to the position of described hot spot, described hot spot is filled with；
According to the position of the described hot spot after filling, described iris image is chosen setting row pixel；
According to the gray value of described setting row pixel, determine that the gray value being positioned at spot center both sides in every one-row pixels is jumped
Become maximum pixel；
Use method of least square that described pixel is carried out curve fitting, determine the center of circle and half of described first border circle
Footpath.
In another embodiment of the invention, described second determines that unit 803 determines in described iris image for characterizing
The second boundary circle of described iris position to be positioned, including:
According to the center of circle of described first border circle, in described iris image, choose rectangular area；
According to described rectangular area, determine described the second boundary circle.
Specifically, described second determines unit 803, according to described rectangular area, determines described the second boundary circle, including:
In described rectangular area, choose setting row pixel；
According to the gray value of described setting row pixel, determine the ash being positioned at described first circle both sides, border in every one-row pixels
The pixel that angle value saltus step is maximum；
According to described pixel, determine the boundary point of described the second boundary circle；
Use method of least square that the boundary point of described the second boundary circle is carried out curve fitting, determine described the second boundary circle
The center of circle and radius.
Specifically, described second determines that unit 803, according to described pixel, determines the boundary point of described the second boundary circle,
Including:
For two pictures that the gray value saltus step being positioned at described first circle both sides, border determined in same one-row pixels is maximum
Vegetarian refreshments, determines each described pixel horizontal range to the center of circle of described first border circle respectively；
According to described horizontal range, determine the boundary point of described the second boundary circle.
In another embodiment of the invention, described Iris Location equipment also includes: graphics processing unit 805, wherein:
Image pre-processing unit 805, for being smoothed described iris image；
Iris image after described smoothing processing is carried out histogram equalization process.
In another embodiment of the invention, described positioning unit 804 is according to described first border circle and described second limit
Boundary's circle, positions the iris in described iris image, including:
Annular region between described first border circle and described the second boundary circle is orientated as in described iris image
The position of iris.
In another embodiment of invention, described first determines that unit 802 determines the position of the hot spot in described pupil, bag
Include:
Threshold value according to setting carries out binary conversion treatment to described iris image；
According to the iris image after described binary conversion treatment, from the iris image after described binary conversion treatment, detect light
Speckle connected domain；
In described iris image, according to the grey value profile around the described hot spot connected domain detected, determine described
The position of hot spot.
A kind of Iris Location equipment provided according to the present invention, described acquiring unit is used for obtaining iris image, described rainbow
Film image comprises iris to be positioned, pupil；Described first position determining unit hot spot in determining described pupil,
Described hot spot is injected described pupil by external light source and is formed；Described second determine unit for the position according to described hot spot and
The half-tone information of described iris image, determines in described iris image for characterizing the of described iris position to be positioned
One border circle and the second boundary circle, the round center of circle comprising described first border circle, described first border and radius, described second
Border circle information comprises the center of circle and the radius of described the second boundary circle；Described positioning unit for according to described first border circle and
Described the second boundary circle, positions the iris in described iris image.So iris authentication system can be according to the iris got
The half-tone information of image, by image processing techniques simply and curve fitting algorithm, in iris image, quickly location appears in the sky
The position of film, improves the work efficiency of iris authentication system.
It will be understood by those skilled in the art that embodiments of the invention can be provided as method, device (equipment) or computer
Program product.Therefore, the present invention can use complete hardware embodiment, complete software implementation or combine software and hardware aspect
The form of embodiment.And, the present invention can use at one or more meters wherein including computer usable program code
The upper computer journey implemented of calculation machine usable storage medium (including but not limited to disk memory, CD-ROM, optical memory etc.)
The form of sequence product.
The present invention is with reference to method, device (equipment) and the flow chart of computer program according to embodiments of the present invention
And/or block diagram describes.It should be understood that can be by each flow process in computer program instructions flowchart and/or block diagram
And/or the flow process in square frame and flow chart and/or block diagram and/or the combination of square frame.These computer programs can be provided to refer to
Order arrives the processor of general purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce
One machine so that the instruction performed by the processor of computer or other programmable data processing device is produced and is used for realizing
The device of the function specified in one flow process of flow chart or multiple flow process and/or one square frame of block diagram or multiple square frame.
These computer program instructions may be alternatively stored in and computer or other programmable data processing device can be guided with spy
Determine in the computer-readable memory that mode works so that the instruction being stored in this computer-readable memory produces and includes referring to
Make the manufacture of device, this command device realize at one flow process of flow chart or multiple flow process and/or one square frame of block diagram or
The function specified in multiple square frames.
These computer program instructions also can be loaded in computer or other programmable data processing device so that at meter
Perform sequence of operations step on calculation machine or other programmable devices to produce computer implemented process, thus at computer or
The instruction performed on other programmable devices provides for realizing at one flow process of flow chart or multiple flow process and/or block diagram one
The step of the function specified in individual square frame or multiple square frame.
Although preferred embodiments of the present invention have been described, but those skilled in the art once know basic creation
Property concept, then can make other change and amendment to these embodiments.So, claims are intended to be construed to include excellent
Select embodiment and fall into all changes and the amendment of the scope of the invention.
Obviously, those skilled in the art can carry out various change and the modification model without deviating from the present invention to the present invention
Enclose.So, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then
The present invention is also intended to comprise these and changes and modification.
Claims (10)
1. an iris locating method, it is characterised in that including:
Obtain iris image, described iris image comprises iris to be positioned, pupil；
Determining the position of hot spot in described pupil, described hot spot is injected described pupil by external light source and is formed；
Position according to described hot spot and the half-tone information of described iris image, determine in described iris image for characterizing
Stating the first border circle and the second boundary circle of iris position to be positioned, described first border circle comprises described first limit
The center of circle of boundary's circle and radius, described the second boundary circle comprises the center of circle and the radius of described the second boundary circle；
According to described first border circle and described the second boundary circle, position the iris in described iris image.
2. iris locating method as claimed in claim 1, it is characterised in that according to position and the described iris of described hot spot
The half-tone information of image, determines in described iris image for characterizing the first border of described iris position to be positioned
Circle, including:
According to the position of described hot spot, described hot spot is filled with；
According to the position of the described hot spot after filling, described iris image is chosen setting row pixel；
According to the gray value of described setting row pixel, determine and every one-row pixels is positioned at the gray value saltus step of spot center both sides
Big pixel；
Use method of least square that described pixel is carried out curve fitting, determine the center of circle and the radius of described first border circle.
3. iris locating method as claimed in claim 2, it is characterised in that determine in described iris image described for characterizing
The second boundary circle of iris position to be positioned, including:
According to the center of circle of described first border circle, in described iris image, choose rectangular area；
According to described rectangular area, determine described the second boundary circle.
4. iris locating method as claimed in claim 3, it is characterised in that according to described rectangular area, determine described second
Border circle, including:
In described rectangular area, choose setting row pixel；
According to the gray value of described setting row pixel, determine the gray value being positioned at described first circle both sides, border in every one-row pixels
The pixel that saltus step is maximum；
According to described pixel, determine the boundary point of described the second boundary circle；
Use method of least square that the boundary point of described the second boundary circle is carried out curve fitting, determine the circle of described the second boundary circle
The heart and radius.
5. iris locating method as claimed in claim 4, it is characterised in that according to described pixel, determine described second limit
The boundary point of boundary's circle, including:
For two pixels that the gray value saltus step being positioned at described first circle both sides, border determined in same one-row pixels is maximum,
Determine each described pixel horizontal range to the center of circle of described first border circle respectively；
According to described horizontal range, determine the boundary point of described the second boundary circle.
6. iris locating method as claimed in claim 3, it is characterised in that for characterizing in determining described iris image
Before stating the second boundary circle of iris position to be positioned, described method also includes:
Described iris image is smoothed；
Iris image after described smoothing processing is carried out histogram equalization process.
7. the iris locating method as described in any one of claim 2 to 6, it is characterised in that according to described first border circle and
Described the second boundary circle, positions the iris in described iris image, including:
Orientate the annular region between described first border circle and described the second boundary circle as iris in described iris image
Position.
8. iris locating method as claimed in claim 1, it is characterised in that determine the position of hot spot in described pupil, bag
Include:
Threshold value according to setting carries out binary conversion treatment to described iris image；
According to the iris image after described binary conversion treatment, from the iris image after described binary conversion treatment, detect that hot spot is even
Logical territory；
In described iris image, according to the grey value profile around the described hot spot connected domain detected, determine described hot spot
Position.
9. an Iris Location equipment, it is characterised in that including:
Acquiring unit, is used for obtaining iris image, comprises iris to be positioned, pupil in described iris image；
First determines unit, and the position of the hot spot in determining described pupil, described hot spot is injected described pupil by external light source
Hole is formed；
Second determines unit, for the position according to described hot spot and the half-tone information of described iris image, determines described rainbow
For characterizing the first border circle and the second boundary circle, described first limit of described iris position to be positioned in film image
Boundary's circle comprises the center of circle and the radius of described first border circle, and described the second boundary circle comprises the center of circle and half of described the second boundary circle
Footpath；
Positioning unit, for according to described first border circle and described the second boundary circle, positioning the iris in described iris image.
10. Iris Location equipment as claimed in claim 9, it is characterised in that described second determines that unit is according to described hot spot
Position and the half-tone information of described iris image, determine in described iris image for characterizing described iris to be positioned
First border circle of position, including:
According to the position of described hot spot, described hot spot is filled with；
According to the position of the described hot spot after filling, described iris image is chosen setting row pixel；
According to the gray value of described setting row pixel, determine and every one-row pixels is positioned at the gray value saltus step of spot center both sides
Big pixel；
Use method of least square that described pixel is carried out curve fitting, determine the center of circle and the radius of described first border circle.
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