CN104573615B - Palmmprint acquisition method and device - Google Patents
Palmmprint acquisition method and device Download PDFInfo
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- CN104573615B CN104573615B CN201310507658.7A CN201310507658A CN104573615B CN 104573615 B CN104573615 B CN 104573615B CN 201310507658 A CN201310507658 A CN 201310507658A CN 104573615 B CN104573615 B CN 104573615B
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- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
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Abstract
The present invention provides a kind of palmmprint acquisition method and device.The palmmprint acquisition method of the present invention, it is characterised in that including：Obtain the palmprint image of palm；Determine position of at least two key points of adjacent finger in the palmprint image in the palm intersection in the palmprint image；According to position of the key point in the palmprint image, the position of palmmprint key area in the palm is determined；The position of the key point and the position of the key area are shown in preview interface, so that user adjusts the palm position until the position of the key point is corresponding with default guide position in the preview interface with the position of the key area.The embodiment of the present invention can accurately be positioned when carrying out the collection of palm palmmprint to palm, improve palmmprint collection accuracy of identification and success rate.
Description
Technical field
The present embodiments relate to image processing techniques, more particularly to a kind of palmmprint acquisition method and device.
Background technology
At present, the single setting password of user inputs password again can not meet user's to obtain the access rights of terminal
Demand for security, just there is an urgent need to a kind of skill for being different from tradition and setting pin mode using biological characteristic progress authentication for this
Art.Palmprint authentication has the characteristics of being easy to receive, and palmprint information is stable, abundant, less demanding to collecting device.How will the palm
Line authentication techniques are applied in Android (Android) intelligent mobile phone platform, are improved eventually using the uniqueness feature of palmmprint biological characteristic
The access safety Journal of Sex Research at end is significant.
In the prior art, the contactless collection of palmmprint is carried out using camera, by adjusting camera and palm
Distance, to adjust the palm area of camera shooting, however, this method may cause personal recognition inaccurate.
The content of the invention
The embodiment of the present invention provides a kind of palmmprint acquisition method and device, and realization is accurate, expeditiously gathers palmmprint.
In a first aspect, the embodiment of the present invention provides a kind of palmmprint acquisition method, including：
Obtain the palmprint image of palm；
Determine at least two key points of adjacent finger in the palmprint image in palm intersection in palmprint image
Position；
According to position of the key point in palmprint image, the position of palmmprint key area in palm is determined；
The position of key point and the position of key area are shown in preview interface so that user adjust palm position until
The position of key point is corresponding with default guide position in the position of key area and preview interface.
With reference in a first aspect, in the first embodiment, determining that adjacent finger is in palm intersection in palmprint image
Position of at least two key points in palmprint image, is specifically included：
In palmprint image in the matrix of each pixel composition, in the range of the row matrix according to corresponding to each finger, it will arrange
The minimum pixel of average gray is defined as key point；
According to the row where the minimum pixel of row average gray, the row where key point is determined.
With reference to first aspect and the first embodiment, in second of embodiment, comprised at least in key point：Forefinger
With middle finger in the first key point of palm intersection, and nameless and little finger is in the second key point of palm intersection.
With reference to first aspect, the first and second of embodiment, in the third embodiment, slapped according to key point
Position in print image, the position of palmmprint key area in palm is determined, is specifically included：
Determine the length of the line between the first key point and the second key point；
By line along the 1/N of the position translation length towards the palm centre of the palm, wherein, N is the number more than 1；
In the position in the palm centre of the palm, rectangular area is determined as side using the line after translation, the position of rectangular area is determined
For the position of key area.
With reference to first aspect and first three embodiment, in the 4th kind of embodiment, according to key point in palmprint image
In position, determine in palm before the position of palmmprint key area, in addition to：
According to the size of palmprint image and the size of preview interface, position of the key point in palmprint image is become
Change, to determine the position of palmmprint key area in palm according to transformation results.
With reference to first aspect and preceding four kinds of embodiments, in the 5th kind of embodiment, according to the size of palmprint image and
The size of preview interface, line translation is entered into position of the key point in palmprint image, specifically included：
According to x'=(h-y) × (w2/w1) to the traveling in the key point matrix that each pixel forms in palmprint image
Line translation, line translation is entered according to the matrix column that each pixel forms in y'=x × (h2/h1) palmprint image；
Wherein, h is the height of the matrix of each pixel composition in palmprint image, and x is key point each pixel in palmprint image
Row in the matrix of point composition, x' is x corresponding rows after conversion, and y is key point each pixel composition in palmprint image
Matrix in row, y ' is y corresponding row after conversion, and w1 is the width of palmprint image, and w2 is the width of preview interface, and h1 is the palm
The height of print image, h2 are the height of preview interface.
With reference to first aspect and first five kind embodiment, in the 6th kind of embodiment, according to key point in palmprint image
In position, determine in palm before the position of palmmprint key area, in addition to：
Row of the key point in palmprint image in the matrix of each pixel composition is handled, and to key point in palmmprint
Row in image in the matrix of each pixel composition are handled, so that at least two key points are in sustained height horizontal line
On.
With reference to first aspect and the first six kind embodiment, in the 7th kind of embodiment, to key point in palmprint image
Row in the matrix of each pixel composition is handled, and in the key point matrix that each pixel forms in palmprint image
Row are handled, and are specifically included：
According toTo key point in palmmprint figure
Row as in the matrix of each pixel composition is handled,
According toTo key point in palmmprint
Row in image in the matrix of each pixel composition are handled；
Wherein, x is row of the key point in palmprint image in the matrix of each pixel composition, and x' is that x is right after conversion
The row answered, y are row of the key point in palmprint image in the matrix of each pixel composition, and y ' is y corresponding row after conversion,
W is the width of original image, and w' is the width by postrotational image, and h is the height of original image, and h' is by postrotational image
It is high.α is the angle of rotation, and its calculation formula is α=arctan ((x3-x1)/(y3-y1)).
Second aspect, the embodiment of the present invention additionally provide a kind of palm print collecting device, including：
Acquisition module, for obtaining the palmprint image of palm；
Locating module, for determining at least two key points of adjacent finger in palmprint image in palm intersection in palmmprint
Position in image；
According to position of the key point in palmprint image, the position of palmmprint key area in palm is determined；
Display module, for showing the position of key point and the position of key area in preview interface, so that user adjusts
Whole palm position is until the position of key point is corresponding with default guide position in the position of key area and preview interface.
With reference to second aspect, in the first embodiment, locating module is specifically used for：
In palmprint image in the matrix of each pixel composition, in the range of the row matrix according to corresponding to each finger, it will arrange
The minimum pixel of average gray is defined as key point；According to the row where the minimum pixel of row average gray, it is determined that
Row where key point.
With reference to second aspect and the first embodiment, in second of embodiment, comprised at least in key point：Forefinger
With middle finger in the first key point of palm intersection, and nameless and little finger is in the second key point of palm intersection.
With reference to second aspect and first, second kind of embodiment, in the third embodiment, locating module is specifically used
In：
Determine the length of the line between the first key point and the second key point；By line along the position towards the palm centre of the palm
The 1/N of translational length, wherein, N is the number more than 1；In the position in the palm centre of the palm, rectangle region is determined as side using the line after translation
Domain, the position of rectangular area is defined as to the position of key area.
With reference to second aspect and first three embodiment, in the 4th kind of embodiment, locating module is additionally operable to：According to pass
Position of the key point in palmprint image, is determined in palm before the position of palmmprint key area, according to the size of palmprint image and
The size of preview interface, line translation is entered into position of the key point in palmprint image, to determine to slap in palm according to transformation results
The position of line key area.
With reference to second aspect and preceding four kinds of embodiments, in the 5th kind of embodiment, locating module is specifically used for：
According to x'=(h-y) × (w2/w1) to the traveling in the key point matrix that each pixel forms in palmprint image
Line translation, line translation is entered according to the matrix column that each pixel forms in y'=x × (h2/h1) palmprint image；
Wherein, h is the height of the matrix of each pixel composition in palmprint image, and x is key point each pixel in palmprint image
Row in the matrix of point composition, x' is x corresponding rows after conversion, and y is key point each pixel composition in palmprint image
Matrix in row, y ' is y corresponding row after conversion, and w1 is the width of palmprint image, and w2 is the width of preview interface, and h1 is the palm
The height of print image, h2 are the height of preview interface.
With reference to second aspect and first five kind embodiment, in the 6th kind of embodiment, the locating module is additionally operable to：Root
According to position of the key point in palmprint image, determine in palm before the position of palmmprint key area, to key point in palmmprint figure
Row as in the matrix of each pixel composition is handled, and to the matrix of key point each pixel composition in palmprint image
In row handled so that at least two key points are on sustained height horizontal line.
With reference to second aspect and the first six kind embodiment, in the 7th kind of embodiment, locating module is additionally operable to key
Row of the point in palmprint image in the matrix of each pixel composition is handled, and to key point in palmprint image each pixel
Row in the matrix of composition are handled, and are specifically included：According toTo key point in palmprint image each pixel
Row in the matrix of composition is handled, according to
Row of the key point in palmprint image in the matrix of each pixel composition are handled；
Wherein, x is row of the key point in palmprint image in the matrix of each pixel composition, and x' is that x is right after conversion
The row answered, y are row of the key point in palmprint image in the matrix of each pixel composition, and y ' is y corresponding row after conversion,
W is the width of original image, and w' is the width by postrotational image, and h is the height of original image, and h' is by postrotational image
It is high.α is the angle of rotation, and its calculation formula is α=arctan ((x3-x1)/(y3-y1)).
The third aspect, the embodiment of the present invention also provide a kind of palm print collecting device, including：Collector, processor and display
Device；
Collector, for obtaining the palmprint image of palm；
Processor, for determining at least two key points of adjacent finger in palmprint image in palm intersection in palmmprint figure
Position as in；
According to position of the key point in palmprint image, the position of palmmprint key area in palm is determined；
Display, for showing the position of key point and the position of key area in preview interface, so that user adjusts
Palm position is until the position of key point is corresponding with default guide position in the position of key area and preview interface.
With reference to the third aspect, in the first embodiment, processor is specifically used for：
In palmprint image in the matrix of each pixel composition, in the range of the row matrix according to corresponding to each finger, it will arrange
The minimum pixel of average gray is defined as key point；
According to the row where the minimum pixel of row average gray, the row where key point is determined.
With reference to the third aspect and the first embodiment, in second of embodiment, comprised at least in key point：Forefinger
With middle finger in the first key point of palm intersection, and nameless and little finger is in the second key point of palm intersection.
With reference to embodiment in the third aspect and first, second, in the third embodiment, processor is specifically used for：
Determine the length of the line between the first key point and the second key point；By line along the position translation length towards the palm centre of the palm
1/N, wherein, N is number more than 1；In the position in the palm centre of the palm, rectangular area is determined as side using the line after translation, by square
The position in shape region is defined as the position of key area.
With reference to the third aspect and first three embodiment, in the 4th kind of embodiment, processor is additionally operable to：According to key
Position of the point in palmprint image, is determined in palm before the position of palmmprint key area, according to the size of palmprint image and in advance
Look at the size at interface, line translation is entered into position of the key point in palmprint image, to determine palmmprint in palm according to transformation results
The position of key area.
With reference to the third aspect and preceding four kinds of embodiments, in the 5th kind of embodiment, processor is specifically used for：
According to x'=(h-y) × (w2/w1) to the traveling in the key point matrix that each pixel forms in palmprint image
Line translation, line translation is entered according to the matrix column that each pixel forms in y'=x × (h2/h1) palmprint image；
Wherein, h is the height of the matrix of each pixel composition in palmprint image, and x is key point each pixel in palmprint image
Row in the matrix of point composition, x' is x corresponding rows after conversion, and y is key point each pixel composition in palmprint image
Matrix in row, y ' is y corresponding row after conversion, and w1 is the width of palmprint image, and w2 is the width of preview interface, and h1 is the palm
The height of print image, h2 are the height of preview interface.
With reference to the third aspect and first five kind embodiment, in the 6th kind of embodiment, described processor is additionally operable to：Root
According to position of the key point in palmprint image, determine in palm before the position of palmmprint key area, to key point in palmmprint figure
Row as in the matrix of each pixel composition is handled, and to the matrix of key point each pixel composition in palmprint image
In row handled so that at least two key points are on sustained height horizontal line.
With reference to the third aspect and the first six kind embodiment, in the 7th kind of embodiment, processor is additionally operable to key point
Row in palmprint image in the matrix of each pixel composition is handled, and to key point in palmprint image each pixel group
Into matrix in row handled, specifically include：According to
Row of the key point in palmprint image in the matrix of each pixel composition is handled, according toTo key point in palmprint image each pixel
Row in the matrix of point composition are handled；
Wherein, x is row of the key point in palmprint image in the matrix of each pixel composition, and x' is that x is right after conversion
The row answered, y are row of the key point in palmprint image in the matrix of each pixel composition, and y ' is y corresponding row after conversion,
W is the width of original image, and w' is the width by postrotational image, and h is the height of original image, and h' is by postrotational image
It is high.α is the angle of rotation, and its calculation formula is α=arctan ((x3-x1)/(y3-y1)).
Palmmprint acquisition method and device provided in an embodiment of the present invention, in palm palmmprint gatherer process is carried out, by obtaining
The palmprint image of palm is taken, determines at least two key points of adjacent finger in the palmprint image in palm intersection in palmmprint
Position in image, according to position of the key point in palmprint image, the position of palmmprint key area in palm is determined, so as to obtain
Palm location information is obtained, and is shown the position of key point and key area in preview interface, adjusts user
Whole palm position is corresponding with default guide position in the position of key area and preview interface up to the position of key point, from
And palm can accurately be positioned when carrying out the collection of palm palmmprint, improve palmmprint collection accuracy of identification and success rate.
Brief description of the drawings
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
Part of the embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
Fig. 1 is the flow chart for the palmmprint acquisition method that the embodiment of the present invention one provides；
Fig. 2 is the flow chart that palmmprint key point is determined in the palmmprint acquisition method that the embodiment of the present invention two provides；
Fig. 3 is the method schematic diagram that palmmprint key point is determined in the palmmprint acquisition method that the embodiment of the present invention two provides；
Fig. 4 is the structural representation for the palm print collecting device that the embodiment of the present invention three provides；
Fig. 5 is the structural representation for the palm print collecting device that the embodiment of the present invention four provides.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
Part of the embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
Fig. 1 is the palmmprint acquisition method flow chart that the embodiment of the present invention one provides.The executive agent of the embodiment of the present invention can
Think the equipment with IMAQ, image procossing and image display function.As shown in figure 1, the embodiment of the present invention provides one kind
Palmmprint acquisition method, including：
Step 101, the palmprint image of palm is obtained；
Specifically, can by image capture module, such as：Camera module gathers the colored palmprint image of palm.
Under normal circumstances, the palmprint image that acquired original arrives is coloured image, such as：Can be that pixel is 720*540
Image.Optionally, parts of images can be intercepted in original palmprint image to carry out subsequent operation, such as：Colour can be slapped
Print image is converted into single channel gray level image, intercepts the top half of original image, obtains the image that pixel is 720*270.
Step 102, determine at least two key points of adjacent finger in the palmprint image in palm intersection in palmmprint
Position in image；
Optionally, first can be according to the square corresponding to each finger in palmprint image in the matrix of each pixel composition
In battle array line range, the minimum pixel of row average gray is defined as key point.Then it is minimum further according to row average gray
Pixel where row, determine the row where key point.
Wherein, can at least include in key point：Forefinger and middle finger palm intersection the first key point, it is and unknown
Refer to the second key point in palm intersection with little finger.
Step 103, the position according to key point in palmprint image, the position of palmmprint key area in palm is determined；
Optionally, the length of the line between the first key point and the second key point can be determined first；Then by line
Along the 1/N of the position translation length towards the palm centre of the palm, wherein, N can be integer, or decimal, be set to 1/4 herein；
Again in the position in the palm centre of the palm, rectangular area is determined as side using the line after translation, the position of rectangular area is defined as key
The position in region.
Wherein, with the first key point P1With the second key point P2For the line l of two-end-point, its length is d, by line l along court
To the position translation d/4 distances in the centre of the palm, it is then wherein a line with the line l ' after translation, is a rectangle D.This rectangle D is
For the position of palmmprint key area in palm.
Step 104, the position of key point and the position of key area are shown in preview interface, so that user adjusts palm
Position is until the position of key point is corresponding with default guide position in the position of key area and preview interface.
Wherein, in preview interface can advance guide position, such as：Guide position can include a border circular areas and one
Bar is located at the datum line on the right side of border circular areas.When carry out palm palmmprint collection when, user's the five fingers stretching, extension, in addition to thumb remaining four
Finger closes up, and the camera module of whole palm and progress IMAQ is spatially parallel to each other, and then constantly adjusts palm
Position, until the palm palmmprint key area shown in preview interface is centrally located among border circular areas, and user's forefinger
Refer to datum line on the right side of the streakline and border circular areas of root to coincide, now default guiding position in the position of key point and preview interface
Put corresponding.
In the present embodiment, by obtaining the palmprint image of palm, determine that adjacent finger is in palm intersection in palmprint image
Position of at least two key points in palmprint image, according to position of the key point in palmprint image, determine to slap in palm
The position of line key area, the position of key point and the position of key area are shown in preview interface, so that user adjusts hand
Position is slapped until the position of key point is corresponding with default guide position in the position of key area and preview interface.So will
Palm palmmprint real-time display in preview interface, and allow palm position and preview interface on guide position it is corresponding, so as to
Palm can accurately be positioned when carrying out the collection of palm palmmprint, improve palmmprint collection accuracy of identification and success rate.
Fig. 2 is the palmmprint acquisition method flow chart that the embodiment of the present invention two provides, as shown in Fig. 2 the present embodiment is in Fig. 1 institutes
On the basis of showing, position determination process of the key point in palmprint image, and palmmprint key area in palm are provided in detail
The determination process of position.Specifically include：
S201, in the matrix of each pixel of palmprint image composition, will in the range of the row matrix according to corresponding to each finger
The minimum point of row average gray is set to key point；
S202, according to the row where the minimum pixel of row average gray, determine the row where key point；
Specifically, as shown in Figure 3, it is assumed that each pixel of palmprint image collected constitutes the square of one 720 × 270
Battle array A, matrix line range rule of thumb can freely be set corresponding to each finger of palm, such as：Can be since the 60th row of matrix A
One width of interception arranges for 180, the highly submatrix B for 270 rows, using matrix B as row matrix corresponding to palm forefinger；By square
Battle array B seeks average gray according to row, obtains the average value Matrix C of a row of 180 row 1.Minimum value is found in Matrix C, this is most
Small value is the row cols [0] where key point.Similarly rule of thumb, intercepted since being arranged the cols [0]+30 of matrix A wide
Spend for 180 row, highly the submatrix B for 270 rows2, minimum value is obtained according to the method described above, so as to try to achieve second key point institute
In row cols [1], then submatrix B is intercepted since col [1]+303, obtain the 3rd key point column cols [2].
Further according to the row cols [0], cols [1], cols [2] of the minimum gray value tried to achieve, respectively with this three row for center,
Top half from original gradation figure is that to intercept three width be 30 to starting point, the highly subgraph for 200, then according to row to this three
Individual subgraph seeks average gray, obtains the minimum value D of the row average gray of three subgraphs1、D2、D3, this three minimum value pixels
Point is three key point P1、P2、P3, its position coordinates is designated as P1(x,y)、P2(x,y)、P3(x,y)。
After above-mentioned steps, obtained three key point P1、P2、P3Correspond at palm 3 at webs root, then will close respectively
Key point coordinates passes to camera preview interface and is marked with blue round dot.Because preview interface expert the palm direction and
90 ° of actual treatment phase difference, and the size of actual palmmprint picture and the size of preview interface are also different.In order in preview circle
Accurate mark key point is, it is necessary to according to the size of palmprint image and the size of preview interface, by key point in palmmprint face
Line translation is entered in position in image, to determine the position of palmmprint key area in palm according to transformation results.It is specifically included：
According to x'=(h-y) × (w2/w1) to the traveling in the key point matrix that each pixel forms in palmprint image
Line translation, line translation is entered according to the matrix column that each pixel forms in y'=x × (h2/h1) palmprint image；
Wherein, h is the height of the matrix of each pixel composition in palmprint image, and x is key point each pixel in palmprint image
Row in the matrix of point composition, x' is x corresponding rows after conversion, and y is key point each pixel composition in palmprint image
Matrix in row, y ' is y corresponding row after conversion, and w1 is the width of palmprint image, and w2 is the width of preview interface, and h1 is the palm
The height of print image, h2 are the height of preview interface.
After so carrying out coordinate transform, former key point P1、P2、P3It is changed into P1'、P2'、P3', its coordinate P1(x,y)、P2(x,
y)、P3(x, y) is changed into P respectively1'(x',y')、P2'(x',y')、P3'(x',y')。
Obtain crucial point coordinates P1'(x',y')、P2'(x',y')、P3' after (x', y'), according to key point P1' and P3' seat
Mark, makees straight line P in point-to-point transmission1'P3', its length is designated as D.By line P1'P3' translated along the direction towards the palm centre of the palm, translation
Distance is D/4, then makees square, then scale it to standard size.Its common standard size has 256 × 256,128 ×
128th, the size such as 64 × 64.This square area is the palmmprint key area in preview interface.The key area is used and key
Point color identical blueness is drawn.
Further, the position according to key point in palmprint image, determine palmmprint key area in palm position it
Before, in addition to：Row of the key point in palmprint image in the matrix of each pixel composition is handled, and key point is being slapped
Row in print image in the matrix of each pixel composition are handled, so that at least two key points are in sustained height horizontal line
On.Specifically include：
According toTo key point in palmmprint figure
Row as in the matrix of each pixel composition is handled,
According toTo key point in palmmprint
Row in image in the matrix of each pixel composition are handled；
Wherein, x is row of the key point in palmprint image in the matrix of each pixel composition, and x' is that x is right after conversion
The row answered, y are row of the key point in palmprint image in the matrix of each pixel composition, and y ' is y corresponding row after conversion,
W is the width of original image, and w' is the width by postrotational image, and h is the height of original image, and h' is by postrotational image
It is high.α is the angle of rotation, and its calculation formula is α=arctan ((x3-x1)/(y3-y1)).
Particularly, palm position is adjusted in user until on the position of key point and the position and preview interface of key area
When default guide position is corresponding, personalized fan-shaped guidance field can also be utilized to guide.This personalized fan-shaped guiding
Region is usually located at the center of preview interface, can be the border circular areas that one point is several sectors equal in magnitude, each
Sector different digital sequence number is distinguished.When user first by the sample typing palmprint information storehouse of palmprint image when, only need by
The center of palmmprint key area is fallen among any sector of fan-shaped guidance field；System can be to different user in typing
The position that palmmprint key area falls into fan-shaped guidance field is recorded, and obtains the personalized fan-shaped guidance field of the user；
When carrying out personal recognition, user can actively allow the palmmprint key area center shown during identification to fall among corresponding sector, so as to
Accelerate personal recognition efficiency.By personalization centre sector guidance field, solves volunteer's hand size difference or because of shooting
Custom is different, the problem of the difference of key area center.
In the present embodiment, it is determined that during the position of key point and key area in palmprint image, in each pixel of palmprint image
In the matrix of point composition, in the range of the row matrix according to corresponding to each finger, the minimum point of row average gray is set to key
Point；According to the row where the minimum pixel of row average gray, the row where key point is determined, so as to obtain palmprint image key
The position of point, and and then obtain the position of key area in palmprint image so that user can be according to the position of adjustment key point
Palm is adjusted with the position of key area, makes it corresponding with default guide position in preview interface.
Fig. 4 is the structural representation for the palm print collecting device that the embodiment of the present invention three provides.As shown in figure 4, palmmprint gathers
Device includes：
Acquisition module 401, for obtaining the palmprint image of palm；
Locating module 402, for determining that adjacent finger exists at least two key points of palm intersection in palmprint image
Position in palmprint image；
According to position of the key point in palmprint image, the position of palmmprint key area in palm is determined；
Display module 403, for showing the position of key point and the position of key area in preview interface, so that user
Palm position is adjusted until the position of key point is corresponding with default guide position in the position of key area and preview interface.
Further, locating module 402 is it is determined that adjacent finger is at least two passes of palm intersection in palmprint image
It is further comprising the steps of during position of the key point in palmprint image：
S401, in palmprint image in the matrix of each pixel composition, in the range of the row matrix according to corresponding to each finger,
The minimum pixel of row average gray is defined as key point；
S402, according to the row where the minimum pixel of row average gray, determine the row where key point.
Above-mentioned steps are similar with the step of determining key point in the inventive method embodiment one, therefore here is omitted.
Wherein, comprised at least in key point：Forefinger and middle finger palm intersection the first key point, and it is nameless and
Second key point of the little finger in palm intersection.
Further, locating module 402 determines that palmmprint is crucial in palm in the position according to key point in palmprint image
It is further comprising the steps of during the position in region：
S501, determine the length of the line between the first key point and the second key point；
S502, by line along the 1/N of the position translation length towards the palm centre of the palm, wherein, N is the number more than 1；
S503, in the position in the palm centre of the palm, rectangular area is determined as side using the line after translation, by the position of rectangular area
It is defined as the position of key area.
Above-mentioned steps are similar with the step of determining key area in the inventive method embodiment one, therefore here is omitted.
Specifically, locating module 402 in the position according to key point in palmprint image, determines palmmprint key area in palm
Before the position in domain, in addition to：
According to the size of palmprint image and the size of preview interface, position of the key point in palmprint image is become
Change, to determine the position of palmmprint key area in palm according to transformation results.
Further, locating module 402 can also be according to the size of palmprint image and the size of preview interface, by key point
Line translation is entered in position in palmprint image, specifically includes：
According to x'=(h-y) × (w2/w1) to the traveling in the key point matrix that each pixel forms in palmprint image
Line translation, line translation is entered according to the matrix column that each pixel forms in y'=x × (h2/h1) palmprint image；
Wherein, h is the height of the matrix of each pixel composition in palmprint image, and x is key point each pixel in palmprint image
Row in the matrix of point composition, x' is x corresponding rows after conversion, and y is key point each pixel composition in palmprint image
Matrix in row, y ' is y corresponding row after conversion, and w1 is the width of palmprint image, and w2 is the width of preview interface, and h1 is the palm
The height of print image, h2 are the height of preview interface.
Further, locating module 402 determines that palmmprint is crucial in palm in the position according to key point in palmprint image
Before the position in region, in addition to：
Row of the key point in palmprint image in the matrix of each pixel composition is handled, and to key point in palmmprint
Row in image in the matrix of each pixel composition are handled, so that at least two key points are in sustained height horizontal line
On.Specifically include：
According toTo key point in palmmprint figure
Row as in the matrix of each pixel composition is handled,
According toTo key point in palmmprint
Row in image in the matrix of each pixel composition are handled；
Wherein, x is row of the key point in palmprint image in the matrix of each pixel composition, and x' is that x is right after conversion
The row answered, y are row of the key point in palmprint image in the matrix of each pixel composition, and y ' is y corresponding row after conversion,
W is the width of original image, and w' is the width by postrotational image, and h is the height of original image, and h' is by postrotational image
It is high.α is the angle of rotation, and its calculation formula is α=arctan ((x3-x1)/(y3-y1)).
In the present embodiment, the acquisition module of palm print collecting device obtains the palmprint image of palm；Described in locating module determines
Adjacent finger is in position of at least two key points in palmprint image of palm intersection in palmprint image, and according to key point
Position in palmprint image, determine the position of palmmprint key area in palm；Display module shows key in preview interface
The position of point and the position of key area, so that user adjusts palm position until the position of key point and the position of key area
It is corresponding with default guide position in preview interface.So by palm palmmprint real-time display in preview interface, and allow palm
Position and preview interface on guide position it is corresponding, it is accurate so as to be carried out when carrying out the collection of palm palmmprint to palm
Positioning, improve palmmprint collection accuracy of identification and success rate.
Fig. 5 is the structural representation for the palm print collecting device that the embodiment of the present invention four provides.As shown in figure 5, palmmprint gathers
Device includes：
Collector 501, for obtaining the palmprint image of palm；
Processor 502, for determining that adjacent finger is being slapped at least two key points of palm intersection in palmprint image
Position in print image；
According to position of the key point in palmprint image, the position of palmmprint key area in palm is determined；
Display 503, for showing the position of key point and the position of key area in preview interface, so that user adjusts
Whole palm position is until the position of key point is corresponding with default guide position in the position of key area and preview interface.
Further, processor 502 is it is determined that adjacent finger is at least two crucial of palm intersection in palmprint image
It is further comprising the steps of when putting the position in palmprint image：
S601, in palmprint image in the matrix of each pixel composition, in the range of the row matrix according to corresponding to each finger,
The minimum pixel of row average gray is defined as key point；
S602, according to the row where the minimum pixel of row average gray, determine the row where key point.
Above-mentioned steps are similar with the step of determining key point in the inventive method embodiment one, therefore here is omitted.
Wherein, comprised at least in key point：Forefinger and middle finger palm intersection the first key point, and it is nameless and
Second key point of the little finger in palm intersection.
Further, processor 502 determines palmmprint key area in palm in the position according to key point in palmprint image
It is further comprising the steps of during the position in domain：
S701, determine the length of the line between the first key point and the second key point；
S702, by line along the 1/N of the position translation length towards the palm centre of the palm, wherein, N is the number more than 1；
S703, in the position in the palm centre of the palm, rectangular area is determined as side using the line after translation, by the position of rectangular area
It is defined as the position of key area.
Above-mentioned steps are similar with the step of determining key area in the inventive method embodiment one, therefore here is omitted.
Further, processor 502 determines palmmprint key area in palm in the position according to key point in palmprint image
Before the position in domain, in addition to：
According to the size of palmprint image and the size of preview interface, position of the key point in palmprint image is become
Change, to determine the position of palmmprint key area in palm according to transformation results.
Further, processor 502 can also exist key point according to the size of palmprint image and the size of preview interface
Line translation is entered in position in palmprint image, specifically includes：
According to x'=(h-y) × (w2/w1) to the traveling in the key point matrix that each pixel forms in palmprint image
Line translation, line translation is entered according to the matrix column that each pixel forms in y'=x × (h2/h1) palmprint image；
Wherein, h is the height of the matrix of each pixel composition in palmprint image, and x is key point each pixel in palmprint image
Row in the matrix of point composition, x' is x corresponding rows after conversion, and y is key point each pixel composition in palmprint image
Matrix in row, y' is y corresponding row after conversion, and w1 is the width of palmprint image, and w2 is the width of preview interface, and h1 is the palm
The height of print image, h2 are the height of preview interface.
Further, processor 502 determines palmmprint key area in palm in the position according to key point in palmprint image
Before the position in domain, in addition to：Row of the key point in palmprint image in the matrix of each pixel composition is handled, and it is right
Row of the key point in palmprint image in the matrix of each pixel composition are handled, so that at least two key points are in same
On height level's line.Specifically include：
According toTo key point in palmmprint figure
Row as in the matrix of each pixel composition is handled,
According toTo key point in palmmprint
Row in image in the matrix of each pixel composition are handled；
Wherein, x is row of the key point in palmprint image in the matrix of each pixel composition, and x' is that x is right after conversion
The row answered, y are row of the key point in palmprint image in the matrix of each pixel composition, and y ' is y corresponding row after conversion,
W is the width of original image, and w' is the width by postrotational image, and h is the height of original image, and h' is by postrotational image
It is high.α is the angle of rotation, and its calculation formula is α=arctan ((x3-x1)/(y3-y1)).
In the present embodiment, the collector of palm print collecting device obtains the palmprint image of palm；Processor determines the palmmprint
Adjacent finger is in position of at least two key points in palmprint image of palm intersection in image, and is being slapped according to key point
Position in print image, determine the position of palmmprint key area in palm；Display shows the position of key point in preview interface
The position with key area is put, so that user adjusts palm position until the position of key point and position and the preview of key area
Default guide position is corresponding on interface.So by palm palmmprint real-time display in preview interface, and allow the position of palm
It is corresponding with the guide position in preview interface, it is accurately fixed so as to be carried out when carrying out the collection of palm palmmprint to palm
Position, improve palmmprint collection accuracy of identification and success rate.
One of ordinary skill in the art will appreciate that：Realizing all or part of step of above method embodiment can pass through
Programmed instruction related hardware is completed, and foregoing program can be stored in a computer read/write memory medium, the program
Upon execution, the step of execution includes above method embodiment；And foregoing storage medium includes：ROM, RAM, magnetic disc or light
Disk etc. is various can be with the medium of store program codes.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
The present invention is described in detail with reference to the foregoing embodiments, it will be understood by those within the art that：It still may be used
To be modified to the technical scheme described in foregoing embodiments, or equivalent substitution is carried out to which part technical characteristic；
And these modifications or replacement, the essence of appropriate technical solution is departed from the scope of various embodiments of the present invention technical scheme.
Claims (21)
- A kind of 1. palmmprint acquisition method, it is characterised in that including：Obtain the palmprint image of palm；Determine at least two key points of adjacent finger in the palmprint image in the palm intersection in the palmprint image In position；According to position of the key point in the palmprint image, the position of palmmprint key area in the palm is determined；The position of the key point and the position of the key area are shown in preview interface, so that user adjusts the palm Position is until the position of the key point and the position of the key area and default guide position phase in the preview interface It is corresponding；At least two key points that adjacent finger in the palmprint image is determined in the palm intersection are in the palmmprint Position in image, is specifically included：In the palmprint image in the matrix of each pixel composition, in the range of the row matrix according to corresponding to each finger, it will arrange The minimum pixel of average gray is defined as the key point；According to the row where the minimum pixel of the row average gray, the row where the key point is determined.
- 2. according to the method for claim 1, it is characterised in that comprised at least in the key point：Forefinger and middle finger are in institute The first key point of palm intersection, and nameless and little finger are stated in the second key point of the palm intersection.
- 3. according to the method for claim 2, it is characterised in that it is described according to the key point in the palmprint image Position, the position of palmmprint key area in the palm is determined, is specifically included：Determine the length of the line between first key point and second key point；By the line along the 1/N towards length described in the position translation in the palm centre of the palm, wherein, N is the number more than 1；In the position in the palm centre of the palm, rectangular area is determined as side using the line after translation, by the position of the rectangular area It is defined as the position of the key area.
- 4. according to the method described in claim any one of 1-3, it is characterised in that it is described according to the key point in the palmmprint Position in image, determine in the palm before the position of palmmprint key area, in addition to：According to the size of the palmprint image and the size of the preview interface, by the key point in the palmprint image Line translation is entered in position, to determine the position of palmmprint key area in the palm according to transformation results.
- 5. according to the method for claim 4, it is characterised in that the size according to the palmprint image and the preview The size at interface, line translation is entered into position of the key point in the palmprint image, specifically included：According to x'=(h-y) × (w2/w1) in the key point matrix that each pixel forms in the palmprint image Traveling line translation, line translation is entered according to the matrix column that each pixel forms in y'=x × (h2/h1) described palmprint image；Wherein, h is the height of the matrix of each pixel composition in the palmprint image, and x is the key point in the palmprint image In each pixel composition matrix in row, x' be x corresponding rows after conversion, and y is the key point in the palmmprint figure Row as in the matrix of each pixel composition, y ' be y corresponding row after conversion, and w1 is the width of the palmprint image, w2 For the width of the preview interface, h1 is the height of the palmprint image, and h2 is the height of the preview interface.
- 6. according to the method described in claim any one of 1-3, it is characterised in that it is described according to the key point in the palmmprint Position in image, determine in the palm before the position of palmmprint key area, in addition to：Row of the key point in the palmprint image in the matrix of each pixel composition is handled, and to the key Row of the point in the palmprint image in the matrix of each pixel composition are handled so that at least two key point in On sustained height horizontal line.
- 7. according to the method for claim 6, it is characterised in that it is described to the key point in the palmprint image each picture Row in the matrix of vegetarian refreshments composition is handled, and to the matrix of the key point each pixel composition in the palmprint image In row handled, specifically include：According toTo the key point in the palm Row in print image in the matrix of each pixel composition is handled,According toTo the key point described Row in palmprint image in the matrix of each pixel composition are handled；Wherein, x is row of the key point in the palmprint image in the matrix of each pixel composition, and x' is x by conversion Corresponding row afterwards, y are row of the key point in palmprint image in the matrix of each pixel composition, and y ' is y after conversion Corresponding row, w are the width of original image, and w' is the width by postrotational image, and h is the height of original image, and h' is after rotation Image height, α be rotation angle, its calculation formula is α=arctan ((x3-x1)/(y3-y1)).
- A kind of 8. palm print collecting device, it is characterised in that including：Acquisition module, for obtaining the palmprint image of palm；Locating module, for determining that adjacent finger exists at least two key points of the palm intersection in the palmprint image Position in the palmprint image；According to position of the key point in the palmprint image, the position of palmmprint key area in the palm is determined；Display module, for showing the position of the key point and the position of the key area in preview interface, to use Family adjusts the palm position until pre- in the position of the key point and the position of the key area and the preview interface If guide position it is corresponding；The locating module is specifically used for：In the palmprint image in the matrix of each pixel composition, according to each finger, institute is right In the range of the row matrix answered, the minimum pixel of row average gray is defined as the key point；Put down according to the row gray scale Row where the minimum pixel of average, determine the row where the key point.
- 9. device according to claim 8, it is characterised in that comprised at least in the key point：Forefinger and middle finger are in institute The first key point of palm intersection, and nameless and little finger are stated in the second key point of the palm intersection.
- 10. device according to claim 9, it is characterised in that the locating module is specifically used for：Determine that described first closes The length of line between key point and second key point；By the line along the position translation institute towards the palm centre of the palm The 1/N of length is stated, wherein N is the number more than 1；In the position in the palm centre of the palm, rectangle is determined as side using the line after translation Region, the position of the rectangular area is defined as to the position of the key area.
- 11. according to the device described in claim any one of 8-10, it is characterised in that the locating module is additionally operable to：According to institute Position of the key point in the palmprint image is stated, is determined in the palm before the position of palmmprint key area, according to described The size of the size of palmprint image and the preview interface, position of the key point in the palmprint image is become Change, to determine the position of palmmprint key area in the palm according to transformation results.
- 12. device according to claim 11, it is characterised in that the locating module is specifically used for：According to x'=(h-y) × (w2/w1) in the key point matrix that each pixel forms in the palmprint image Traveling line translation, line translation is entered according to the matrix column that each pixel forms in y'=x × (h2/h1) described palmprint image；Wherein, h is the height of the matrix of each pixel composition in the palmprint image, and x is the key point in the palmprint image In each pixel composition matrix in row, x' be x corresponding rows after conversion, and y is the key point in the palmmprint figure Row as in the matrix of each pixel composition, y ' be y corresponding row after conversion, and w1 is the width of the palmprint image, w2 For the width of the preview interface, h1 is the height of the palmprint image, and h2 is the height of the preview interface.
- 13. according to the device described in claim any one of 8-10, it is characterised in that the locating module is additionally operable to：According to institute Position of the key point in the palmprint image is stated, is determined in the palm before the position of palmmprint key area, in addition to：It is right Row of the key point in the palmprint image in the matrix of each pixel composition is handled, and to the key point in institute State the row in palmprint image in the matrix of each pixel composition to be handled, so that at least two key point is in same height Spend on horizontal line.
- 14. device according to claim 13, it is characterised in that the locating module is additionally operable to：The key point is existed Row in the palmprint image in the matrix of each pixel composition is handled, and to the key point in the palmprint image Row in the matrix of each pixel composition are handled, and are specifically included：According toTo the key point in the palm Row in print image in the matrix of each pixel composition is handled, according toTo the key point in the palmprint image In each pixel composition matrix in row handled；Wherein, x is the key point each pixel in the palmprint image Row in the matrix of composition, x' are x corresponding rows after conversion, and y is the key point each pixel group in palmprint image Into matrix in row, y ' is y corresponding row after conversion, and w is the width of original image, and w' is by postrotational image Width, h are the height of original image, and h' is the height by postrotational image, and α is the angle of rotation, and its calculation formula is α=arctan ((x3-x1)/(y3-y1))。
- A kind of 15. palm print collecting device, it is characterised in that including：Collector, processor and display；The collector, for obtaining the palmprint image of palm；The processor, for determining that adjacent finger is at least two key points of the palm intersection in the palmprint image Position in the palmprint image；According to position of the key point in the palmprint image, the position of palmmprint key area in the palm is determined；The display, for showing the position of the key point and the position of the key area in preview interface, so that User adjusts the palm position until on the position of the key point and the position of the key area and the preview interface Default guide position is corresponding；The processor is specifically used for：In the palmprint image in the matrix of each pixel composition, in the range of the row matrix according to corresponding to each finger, it will arrange The minimum pixel of average gray is defined as the key point；According to the row where the minimum pixel of the row average gray, the row where the key point is determined.
- 16. device according to claim 15, it is characterised in that comprised at least in the key point：Forefinger and middle finger exist First key point of the palm intersection, and nameless and little finger is in the second key point of the palm intersection.
- 17. device according to claim 16, it is characterised in that the processor is specifically used for：Determine the length of the line between first key point and second key point；By the line along towards the hand The 1/N of length described in the position translation in the centre of the palm is slapped, wherein, N is the number more than 1；In the position in the palm centre of the palm, after translation Line determine rectangular area for side, the position of the rectangular area is defined as to the position of the key area.
- 18. according to the device described in claim any one of 15-17, it is characterised in that the processor is additionally operable to：According to described Position of the key point in the palmprint image, determine in the palm before the position of palmmprint key area, according to the palm The size of the size of print image and the preview interface, line translation is entered into position of the key point in the palmprint image, To determine the position of palmmprint key area in the palm according to transformation results.
- 19. device according to claim 18, it is characterised in that the processor is specifically used for：According to x'=(h-y) × (w2/w1) in the key point matrix that each pixel forms in the palmprint image Traveling line translation, line translation is entered according to the matrix column that each pixel forms in y'=x × (h2/h1) described palmprint image；Wherein, h is the height of the matrix of each pixel composition in the palmprint image, and x is the key point in the palmprint image In each pixel composition matrix in row, x' be x corresponding rows after conversion, and y is the key point in the palmmprint figure Row as in the matrix of each pixel composition, y ' be y corresponding row after conversion, and w1 is the width of the palmprint image, w2 For the width of the preview interface, h1 is the height of the palmprint image, and h2 is the height of the preview interface.
- 20. according to the device described in claim any one of 15-17, it is characterised in that the processor is additionally operable to：According to described Position of the key point in the palmprint image, determine in the palm before the position of palmmprint key area, in addition to：To institute Row of the key point in the palmprint image in the matrix of each pixel composition is stated to be handled, and to the key point described Row in palmprint image in the matrix of each pixel composition are handled, so that at least two key point is in sustained height On horizontal line.
- 21. device according to claim 20, it is characterised in that the processor is additionally operable to：To the key point in institute The row in palmprint image in the matrix of each pixel composition is stated to be handled, and to the key point in the palmprint image it is each Row in the matrix of pixel composition are handled, and are specifically included：According toTo the key point in the palm Row in print image in the matrix of each pixel composition is handled, according toTo the key point in the palmprint image In each pixel composition matrix in row handled；Wherein, x is the key point each pixel in the palmprint image Row in the matrix of composition, x' are x corresponding rows after conversion, and y is the key point each pixel group in palmprint image Into matrix in row, y' is y corresponding row after conversion, and w is the width of original image, and w' is by postrotational image Width, h are the height of original image, and h' is the height by postrotational image, and α is the angle of rotation, and its calculation formula is α=arctan ((x3-x1)/(y3-y1))。
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| CN106295481A (en) * | 2015-06-10 | 2017-01-04 | 小米科技有限责任公司 | Palmmprint acquisition component, personal recognition assembly, cover plate and mobile device |
| CN106056080B (en) * | 2016-05-30 | 2019-11-22 | 中控智慧科技股份有限公司 | A kind of visual biometric information acquisition device and method |
| CN107229928B (en) * | 2017-08-04 | 2020-03-17 | 上海市数字证书认证中心有限公司 | Mobile terminal palm print acquisition method and system for auxiliary positioning |
| CN108960081B (en) * | 2018-06-15 | 2021-07-30 | 熵基科技股份有限公司 | Palm image recognition method and device and computer readable storage medium |
| CN109146879B (en) * | 2018-09-30 | 2021-05-18 | 杭州依图医疗技术有限公司 | Method and device for detecting bone age |
| CN110008824B (en) * | 2019-02-20 | 2023-09-22 | 平安科技（深圳）有限公司 | Palmprint recognition method, palmprint recognition device, palmprint recognition computer device and palmprint recognition storage medium |
| CN110287775B (en) * | 2019-05-15 | 2023-09-22 | 平安科技（深圳）有限公司 | Palm image clipping method, palm image clipping device, computer equipment and storage medium |
| CN113780201B (en) * | 2021-09-15 | 2022-06-10 | 墨奇科技（北京）有限公司 | Hand image processing method and device, equipment and medium |
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