CN105078472A - Physiological feature image acquisition device and method - Google Patents
Physiological feature image acquisition device and method Download PDFInfo
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- CN105078472A CN105078472A CN201510524187.XA CN201510524187A CN105078472A CN 105078472 A CN105078472 A CN 105078472A CN 201510524187 A CN201510524187 A CN 201510524187A CN 105078472 A CN105078472 A CN 105078472A
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Abstract
The invention discloses a physiological feature image acquisition device and method. The physiological feature image acquisition device comprises a first ultrasonic transmitting unit, ... and a nth ultrasonic transmitting unit which are arranged around a physiological feature image acquisition area and used for transmitting ultrasonic waves, a first ultrasonic receiving unit, ... and a nth ultrasonic receiving unit which are arranged around the physiological feature image acquisition area and used for receiving the ultrasonic waves, a control unit for controlling the ultrasonic waves sequentially transmitted by every one of the first ultrasonic transmitting unit, ... and the nth ultrasonic transmitting unit in predetermined sequence, and a processing unit for processing the ultrasonic waves received by the corresponding units of the first ultrasonic receiving unit, ... and the nth ultrasonic receiving unit and attenuated by a first object in the corresponding first area on the first surface according to the transmitting sequence of the first ultrasonic transmitting unit, ... and the nth ultrasonic transmitting unit based on a predetermined rule to obtain physiological feature images, wherein the n is a natural number greater than 1.
Description
Technical field
The present invention relates to the technical field of physiological feature Image Acquisition, more particularly, relating to by using the ultrasonic apparatus and method obtaining physiological feature image.
Background technology
One large feature of information-based high speed development is digitized and the recessivation of personal identification, how the identity of a precise Identification people, and protection information is safely to solve to obtain a key social problem the current information age.Biometric identity authentication technique is a study hotspot in identity verify field.Biometrics identification technology refers to that the physiological feature or behavior characteristics that utilize human body intrinsic are to carry out the technology that personal identification differentiates certification.Biometrics identification technology comprises the identity identifying technology adopting the intrinsic physiological feature (as face, fingerprint, palmmprint, iris, vein, retina) of human body to carry out.Compared with traditional identity authentication means, the identity authentication technology tool based on living things feature recognition has the following advantages: (1) can not be forgotten or lose; (2) anti-counterfeiting performance is good, not easily forgery or stolen; (3) " carry with ", can use whenever and wherever possible.Have above-mentioned advantage just because of biometric identity identification certification, the identity identifying and authenticating technology based on biological characteristic receives the very big attention of industry.
For fingerprint, current fingerprint detection scheme is roughly divided into following four kinds: optical scanning device (such as miniature prism matrix), the scanning of temperature difference vicarious fingerprint sensor, semiconductor fingerprint sensor, ultrasonic fingerprint.
Gathering fingerprint by optical technology is history technology the most remote, most popular.Finger is placed on optical glass, point under built-in light source irradiates, be incident upon on charge-coupled image sensor (CCD) with prism, so formed ridge line (there is in fingerprint image the streakline of one fixed width and trend) in black, valley line (female between streakline) in white digitized, can by many gray-scale fingerprint images of fingerprint equipment algorithm process.The fingerprint collecting technology of optics has obvious advantage: it tests through the application of long period, to a certain extent the variation of adaptive temperature, can reach the high-resolution etc. of 500DPI, and main is cheap.Also have obvious shortcoming: owing to requiring sufficiently long light path, therefore require enough large size, and overdrying and too greasy finger also will make the effect of optical finger print product degenerate.
Temperature difference induction identification technology is made based on the principle of temperature sense, and each pixel is equivalent to a microminiaturized charge sensor, to be used between finger sensing and chip mapping domain the temperature difference of certain point, produces the signal of telecommunication of a representative image information.Its advantage can obtain fingerprint image in 0.1s, and sensor bulk and area minimum, namely usually said at present slide fingerprint identifier adopts this technology exactly.Shortcoming is: be limited by temperature limitation, the time one is long, and finger and chip are just in identical temperature.
The technology of based semiconductor silicon capacity effect is tending towards ripe.Silicon sensor becomes a pole plate of electric capacity, and finger is then another pole plate, utilizes the ridge and valley of pointing streakline relative to the capacitance difference between level and smooth silicon sensor, forms the gray level image of 8bit.Capacitance sensor sends electronic signal, and electronic signal will pass the surface of finger and dead property skin layer, and the live body layer (skin corium) of through finger skin, directly reads fingerprint pattern.Owing to going deep into skin corium, sensor can catch more truthful datas, is not subject to the impact of finger surface dustiness, improves identification accuracy rate, effectively prevents identification mistake.Semiconductor fingerprint sensor comprises quasiconductor pressure-sensitive sensor, conductor temperature inductive transducer etc., and wherein, most widely used is semicoductor capacitor formula fingerprint sensor.Semicoductor capacitor fingerprint sensor advantage be picture quality better, generally undistorted, size is less, easy of integration in various equipment.Its electronic signal sent, by through the surface pointed and dead property skin layer, reaches the live body layer (skin corium) of finger skin, directly reads fingerprint pattern, thus substantially increase the safety of system.Semicoductor capacitor fingerprint sensor is because of manufacturing process complexity, in unit are, sensing unit is many, comprise high-end, IC designing technique, large scale integrated circuit manufacturing technology, IC chip encapsulation technology etc., so capacitive fingerprint sensor is all almost by the country of IC technology prosperity, as the ground such as the U.S., Europe, Taiwan manufacture and design.Domestic at present only have only a few producer to have the ability to produce semiconductor fingerprint sensor.
Ultrasonic fingerprint collection is a kind of new technique, its principle is the ability utilizing ultrasound wave to have penetrable material, and produce with the difference of material the echo (when ultrasound wave arrives unlike material surface, the degree being absorbed, penetrate and reflect is different) varied in size.Therefore, utilize skin and air for the difference of sound impedance, just can distinguish the position at fingerprint ridge and place, valley.The ultrasonic frequency that ultrasonic technology uses is 1 × 104Hz-1 × 109Hz, and energy is controlled in the degree (with the intensity of medical diagnosis identical) harmless to human body.Ultrasonic technology product can reach best precision, and it requires lower to the clean-up performance in the peaceful face of finger, but its acquisition time can be longer than aforementioned two series products significantly, and expensive, also can not accomplish living body finger print identification, so use rareness at present.
Relatively can be found out by above, the detection scheme of optical profile type and temperature difference vicarious is no longer main flow due to the restriction of accuracy, although array type capacity or the high equipment complexity of ultrasonic detection scheme accuracy.Further, in the employing electric capacity of array or the equipment of ultrasonic detection scheme, usual detectable region is limited, that is: be limited to the electric capacity of array or the arrange regional of ultrasound emission unit.
Summary of the invention
In view of above situation, expect to provide and can reduce equipment complexity and the unrestricted physiological feature image detection device of surveyed area and method.
According to an aspect of the present invention, providing a kind of physiological feature image acquiring device, comprising: the 1 to the n-th ultrasonic transmitting element, placing, for launching ultrasound wave around physiological feature image-acquisition area; 1 to the n-th ultrasonic wave receive unit, places, for receiving ultrasound wave around described physiological feature image-acquisition area; Control unit, launches ultrasound wave for each control in described 1 to the n-th ultrasonic transmitting element successively according to predesigned order; And processing unit, for the firing order according to described 1 to the n-th ultrasonic transmitting element, based on pre-defined rule, that receive ultrasonic wave receive unit corresponding in described 1 to the n-th ultrasonic wave receive unit, due to the first object in first area corresponding on described first surface after decaying ultrasound wave processes, to obtain physiological feature image, wherein n be greater than 1 natural number.
Preferably, in the physiological feature image acquiring device of the embodiment of the present invention, along a closed curve, with the 1 to the n-th ultrasonic transmitting element described in arranged at predetermined intervals and described 1 to the n-th ultrasonic wave receive unit.
Preferably, in the physiological feature image acquiring device of the embodiment of the present invention, described control unit controls one or more ultrasonic transmitting element at every turn and launches ultrasound wave simultaneously.
Preferably, in the physiological feature image acquiring device of the embodiment of the present invention, described processing unit using the line of the current ultrasonic transmitting element launched and described first object the ultrasonic wave receive unit of process as the ultrasonic wave receive unit of described correspondence.
Preferably, in the physiological feature image acquiring device of the embodiment of the present invention, the hyperacoustic ultrasonic wave receive unit of described processing unit using the first object in all first areas receiving correspondence on described first surface after decaying is all as the ultrasonic wave receive unit of described correspondence.
Preferably, in the physiological feature image acquiring device of the embodiment of the present invention, ultrasonic transmitting element and ultrasonic transmitting element are integrated into same unit, and switch emission state and accepting state by described control unit.
According to a further aspect in the invention, provide a kind of physiological feature image acquiring method, be applied to a physiology characteristic image acquisition device, described physiological feature image acquiring device comprises: the 1 to the n-th ultrasonic transmitting element, place, for launching ultrasound wave around physiological feature image-acquisition area; 1 to the n-th ultrasonic wave receive unit, place around described physiological feature image-acquisition area, for receiving ultrasound wave, described method comprises: each control in described 1 to the n-th ultrasonic transmitting element launches ultrasound wave successively according to predesigned order; And according to the firing order of described 1 to the n-th ultrasonic transmitting element, based on pre-defined rule, that receive ultrasonic wave receive unit corresponding in described 1 to the n-th ultrasonic wave receive unit, due to the first object in first area corresponding on described first surface after decaying ultrasound wave processes, to obtain described physiological feature image, wherein n be greater than 1 natural number.
Preferably, in the physiological feature image acquiring method of the embodiment of the present invention, the one or more ultrasonic transmitting element of each control launches ultrasound wave simultaneously.
Preferably, in the physiological feature image acquiring method of the embodiment of the present invention, using the line of the current ultrasonic transmitting element launched and described first object the ultrasonic wave receive unit of process as the ultrasonic wave receive unit of described correspondence.
Preferably, in the physiological feature image acquiring method of the embodiment of the present invention, the hyperacoustic ultrasonic wave receive unit using the first object in all first areas receiving correspondence on described first surface after decaying is all as the ultrasonic wave receive unit of described correspondence.
By according to the physiological feature image acquiring device of the embodiment of the present invention and method, compared with capacitance type detector of the prior art, significantly reduce equipment complexity.In addition, owing to only needing ultrasonic transmitting element and the ultrasonic wave receive unit of placing some around surveyed area, therefore concrete detection position is unrestricted comparatively speaking, as long as be arranged in surveyed area, and the region area that can perform detection is larger.Compared with supersonic detection device of the prior art, particularly when the area of surveyed area is larger, owing to only need place around region but not whole region laying sonac, therefore while guaranteeing large-area surveyed area, reduce further cost.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the image reconstruction principle that testee section is shown;
Fig. 2 is the functional block diagram of the configuration of the physiological feature image acquiring device illustrated according to the embodiment of the present invention;
Fig. 3 A shows the first example of the concrete layout of ultrasonic transmitting element and ultrasonic wave receive unit;
Fig. 3 B shows the second example of the concrete layout of ultrasonic transmitting element and ultrasonic wave receive unit;
Fig. 4 shows a kind of example of the selection of the ultrasonic wave receive unit when obtaining physiological feature image; And
Fig. 5 is the flow chart of the process of the physiological feature image acquiring method illustrated according to the embodiment of the present invention.
Detailed description of the invention
Below with reference to accompanying drawings of the present invention each is preferred embodiment described.There is provided the description referring to accompanying drawing, to help the understanding to the example embodiment of the present invention limited by claim and equivalent thereof.It comprises the various details helping to understand, but they can only be counted as exemplary.Therefore, those skilled in the art will recognize that, can make various changes and modifications embodiment described herein, and do not depart from the scope of the present invention and spirit.And, in order to make description clearly succinct, will the detailed description to well known function and structure be omitted.
Before description is according to the physiological feature image acquiring device of the embodiment of the present invention and the concrete configuration of method, by introduction according to the ultimate principle of physiological feature image capture technology of the present invention and total design.In the arrayed ultrasonic scheme of prior art, ultrasonic transmitting element and receiving element are arranged in surveyed area, that is: the region of physiological feature image will be presented, the transmit direction of ultrasonic pulse is vertical with surveyed area, ultrasonic pulse can be reflected after arriving at finger surface, and ultrasonic wave receive unit then can utilize the ultrasonic pulse reflected to get the three-dimensional information of fingerprint.Further, in the arrayed ultrasonic scheme of prior art, the ultrasonic pulse after the reflection received by single receiving element directly can obtain the image of corresponding pixel points.By contrast, in the present invention, need to illustrate, different from arrayed ultrasonic detection technique of the prior art, not ultrasonic transmitting element and receiving element are arranged in surveyed area, but ultrasonic transmitting element and receiving element are arranged in around surveyed area.The transmit direction of ultrasonic pulse is parallel with surveyed area.What ultrasonic wave receive unit received not only may comprise the ultrasonic pulse reflected, be more also comprise be propagated through tested organism and decay after ultrasonic pulse.Further, physiological feature image could be obtained after the signal by receiving all receiving elements carries out calculation process.
Next, will describe in detail according to the ultimate principle of physiological feature Image Acquisition of the present invention, the principle of itself and CT (ComputedTomography) image reconstruction is similar.So-called CT image reconstruction is according to the data after gathering, and solves pixel in image array, then re-constructs the process of image; And solving of image array is completed by computer.CT image reconstruction has four kinds of rudimentary algorithms: matrix method, iterative method, Fourier algorithm and backprojection algorithm.In the analytic method of CT image reconstruction, current the most frequently used be the filtered back-projection adopting convolution algorithm, also claim Filtered Back-projection.Be described for convolutional back-projection below.
When convolutional back-projection rebuilds image, first carry out convolution algorithm by the initial data that detector obtains and a filter function, obtained the projection function of all directions convolution; And then they are carried out back projection from all directions, be namely evenly distributed in each matrix element by its original route, after superposing, obtain the CT value of each matrix element; The faultage image of scanned object just can be obtained again after suitably processing, the edge that convolutional back-projection can eliminate simple back projection's generation loses sharp effect, compensate the radio-frequency component in projection and reduce projection centre density, and image edge clear is rebuild in guarantee and inside is evenly distributed.
The mathematic(al) representation of Filtered Back-projection by thunder when projection theorem is derived, directly can provide expression formula below.As shown in Figure 1, getting object fault plane is x-y coordinate system, and the monoenergetic narrow beam ultrasound wave that ultrasonic transmitting element A sends is the object tomography of μ (x, y) through attenuation quotient, and the projection along S path x-ray bundle can be written as:
P(x,y)＝∫∫μ(x,y)dxdy＝-ln(I
m/I
o)
I in formula
oultrasound wave output intensity, I
mit is the ultrasonic intensity that detector records.
From above formula, projection value P (x, y) is exactly attenuation coefficient mu (x, y) at the two-dimensional integration of fault plane, if measure projection value P (x, y), the Two dimensional Distribution of attenuation coefficient mu (x, y) on this fault plane can be obtained.
In hyperacoustic translation-rotation sweep, hyperacoustic projection value P (x, y) is always relevant with ultrasonic wave path S, in FIG, introduces a new coordinate system R-θ and describes the position of ultrasonic wave path S in x-y coordinate system; Getting R is the distance of ultrasonic wave path S to coordinate center, is θ, then uses linear equation with y-axis angle: xcos θ+ysin θ=R describes path S.If get δ (t)-function for the screening factor, then μ (x, y) δ (t) is the attenuation quotient of specifying a certain path, and at this moment, the corresponding projection of a certain angle θ can be written as:
P
θ(R,θ)＝∫∫μ(x,y)(xcosθ+ysinθ-R)dxdy
P in formula
θ(R, θ) is only the function of R, is designated as P (R); If getting filter function is Φ (t), losing sharp effect to eliminate edge, needing with Φ (t) projection P
θ(R, θ) carry out filtering effectively, be added with back projection signal with filter function, the composition of positive and negative is there is in Shi Ge projection signal in its both sides, form so-called filtered back projection signal, during due to each signal superposition, the small pulse of these positive and negatives almost cancels each other, be equivalent to, losing sharp part cancellation, make image similar to material object; This filtering is equivalent to P
θ(R, θ) and Φ (t) carry out convolution algorithm.
Q
θ(R,θ)＝P(R)*Φ(R)＝∫P(t)Φ(R-t)dt
The convolution of both P (R) * Φ (R) expressions in formula.
The back projection of corresponding angle θ can be written as:
B
θ(x,y)＝∫Q
θ(R',θ)δ(t-R')dR'
Angle θ is changed to the corresponding all back projection values of π from 0 be added, the attenuation quotient of tomographic image reconstructing can be obtained:
Then, attenuation quotient is utilized can to rebuild object faultage image.
Next, with reference to Fig. 2, the physiological feature image acquiring device according to the embodiment of the present invention is described.Fig. 2 is the functional block diagram of the configuration of the physiological feature image acquiring device illustrated according to the embodiment of the present invention.As shown in Figure 2, physiological feature image acquiring device 200 comprises: the 1 to the n-th ultrasonic transmitting element 201
1~ 201
n, the 1 to the n-th ultrasonic wave receive unit 202
1~ 202
n, control unit 203 and processing unit 204.
1 to the n-th ultrasonic transmitting element 201
1~ 201
nplace, for launching ultrasound wave around physiological feature image-acquisition area.Wherein, n be greater than 1 natural number.Here, physiological feature image-acquisition area is the region for obtaining physiological feature image.Such as, when described physiological feature image is fingerprint image, described physiological feature image-acquisition area can be the region that user places finger.And for example, when described physiological feature image is palmprint image, described physiological feature image-acquisition area can be the region that user places palm.
1 to the n-th ultrasonic wave receive unit 202
1~ 202
nplace, for receiving ultrasound wave around described physiological feature image-acquisition area.
Control unit 203 launches ultrasound wave for each control in described 1 to the n-th ultrasonic transmitting element successively according to predesigned order.Described 1 to the n-th ultrasonic transmitting element can launch ultrasound wave successively according to the order from 1 to n.Or described 1 to the n-th ultrasonic transmitting element can launch ultrasound wave successively according to out of order.Further, described control unit only can control a ultrasonic transmitting element transmitting ultrasound wave at every turn.Or described control unit also can control multiple ultrasonic transmitting element and launch ultrasound wave at every turn simultaneously.
1 to the n-th ultrasonic transmitting element launches ultrasound wave along substantially parallel with physiological feature image-acquisition area direction.Such as, when finger is placed in physiological feature image-acquisition area by user, decay will be produced to launched hyperacoustic vibration.
Processing unit 204 is for the firing order according to described 1 to the n-th ultrasonic transmitting element, based on pre-defined rule, that receive ultrasonic wave receive unit corresponding in described 1 to the n-th ultrasonic wave receive unit, due to the first object in described physiological feature image-acquisition area after decaying ultrasound wave processes, to obtain the faultage image of the first object in described physiological feature image-acquisition area, i.e. physiological feature image.Such as, the first object can be the finger of user, and physiological feature image is now fingerprint image.
Pre-defined rule described here can be above described image reconstruction principle.Particularly, it can be Filtered Back-projection, also can be matrix method, iterative method, Fourier algorithm etc.In a word, described pre-defined rule is the principle of rebuilding faultage image based on computed tomography.
By the physiological feature image acquiring device according to the embodiment of the present invention, compared with capacitance type detector of the prior art, significantly reduce equipment complexity.In addition, owing to only needing ultrasonic transmitting element and the ultrasonic wave receive unit of placing some around surveyed area, therefore concrete detection position is unrestricted comparatively speaking, as long as be arranged in surveyed area, and the region area that can perform detection is larger.Compared with supersonic detection device of the prior art, particularly when the area of surveyed area is larger, owing to only need place around region but not whole region laying sonac, therefore while guaranteeing large-area surveyed area, reduce further cost.
Next, the concrete layout example of ultrasonic transmitting element and ultrasonic wave receive unit is described with reference to Fig. 3 A-3B.
According in the physiological feature image acquiring device of the embodiment of the present invention, can along a closed curve, with the 1 to the n-th ultrasonic transmitting element described in arranged at predetermined intervals and described 1 to the n-th ultrasonic wave receive unit.
As a kind of example, in figure 3 a, dotted line frame 301 represents physiological feature image-acquisition area, and multiple ultrasonic transmitting element and receiving element (illustrating with ellipse in figure) are arranged along a rectangle 302.But closed curve is not limited in rectangle.As another kind of example, in figure 3b, multiple ultrasonic transmitting element and receiving element (illustrating with ellipse in figure) are arranged along one oval 303.Certainly, Fig. 3 A and Fig. 3 B illustrate only two kinds of possible examples, and the present invention is not limited to this.Also multiple ultrasonic transmitting element and receiving element can be arranged along the curve of any other shape.
In addition, in order to reach desirable precision, should will arrange that the Separation control of multiple ultrasonic transmitting element and receiving element is within predetermined threshold, that is: arrange that the interval of multiple ultrasonic transmitting element and receiving element can not be too large.
In addition, the interval of multiple ultrasonic transmitting element and receiving element can be equal, can certainly be unequal.
Physiological feature image acquiring device according to the embodiment of the present invention can be applied to various electronic equipment, as smart mobile phone, panel computer etc.Such as, when being applied to smart mobile phone, using the region of touch screen as physiological feature image-acquisition area, and multiple ultrasonic transmitting element and receiving element can be placed on around touch screen.Particularly, can multiple ultrasonic transmitting element and receiving element be placed in the space of more than touch screen, also multiple ultrasonic transmitting element and receiving element can be placed in the space of below touch screen.Such as, multiple ultrasonic transmitting element and receiving element can be attached at around touch screen with patch form.Such as, multiple ultrasonic transmitting element and receiving element can be attached at the front of mobile phone.And for example, multiple ultrasonic transmitting element and receiving element can be attached at the inner position near touch screen of handset shell.For another example, also multiple ultrasonic transmitting element and receiving element can be attached at the back side of mobile phone.For another example, also multiple ultrasonic transmitting element and receiving element can be attached at the side frame of mobile phone.
Certainly, it is to be noted, launch hyperacoustic direction due to ultrasonic transmitting element and be parallel to physiological feature image-acquisition area, i.e. touch screen, therefore ultrasonic transmitting element and touch screen is nearer in the distance in equipment depth direction, ultrasound wave is fewer by intermediate transmission media loss, then accuracy of detection is higher; Otherwise ultrasonic transmitting element and touch screen far away in the distance in equipment depth direction, ultrasound wave is more by intermediate transmission media loss, then accuracy of detection is lower.
Fig. 4 shows a kind of example of the selection of the ultrasonic wave receive unit when obtaining physiological feature image.As shown in Figure 4, as a kind of embodiment, described processing unit 204 can using the line of the current ultrasonic transmitting element launched and described first object (being illustrated as finger in figure) the ultrasonic wave receive unit of process as the ultrasonic wave receive unit of described correspondence.In this case, the complexity of date processing is lower, and processing speed is very fast.
Specifically, first processing unit 204 can obtain the position of finger touch.Such as, this position can be obtained by the detection of touch screen.Then, based on position and the touch location of ultrasonic transmitting element, calculate the line equation of the two.Finally, based on the arrangement position of this line equation and ultrasonic wave receive unit, the ultrasonic wave receive unit crossing with this line equation is calculated.
But, the hyperacoustic ultrasonic wave receive unit received after the first object decay may be not limited only to the line of the above described current ultrasonic transmitting element launched and described first object (being illustrated as finger in figure) the ultrasonic wave receive unit of process.In fact, the even all ultrasonic wave receive unit of portion of ultrasonic sound wave receiving element can receive the ultrasound wave of differential declines degree.Therefore, as the embodiment that another kind is possible, described processing unit can using all the first object in corresponding first area and hyperacoustic ultrasonic wave receive unit after decaying of receiving on described first surface all as the ultrasonic wave receive unit of described correspondence.Compared with the embodiment shown in Fig. 4, owing to needing to process the signal received by multiple ultrasonic wave receive unit, therefore the complexity of date processing is higher, and processing speed is comparatively slow, but precision is higher.
In addition, what describe hereinbefore is the situation arranging ultrasonic transmitting element and ultrasonic wave receive unit respectively.But the present invention is not limited to this.Alternatively, ultrasonic transmitting element and ultrasonic transmitting element can be integrated into same unit, and switch emission state and accepting state by described control unit.
Hereinbefore, the concrete configuration of the physiological feature image acquiring device according to the embodiment of the present invention is described in detail with reference to Fig. 2 to Fig. 4.Next, with reference to Fig. 5, the detailed process according to the physiological feature image acquiring method of the embodiment of the present invention is described.
Described physiological feature image acquiring method is applied to above described physiological feature image acquiring device.As noted before, physiological feature image acquiring device comprises: the 1 to the n-th ultrasonic transmitting element, places, for launching ultrasound wave around physiological feature image-acquisition area; 1 to the n-th ultrasonic wave receive unit, places, for receiving ultrasound wave around physiological feature image-acquisition area.Wherein n be greater than 1 natural number.1 to the n-th ultrasonic transmitting element launches ultrasound wave along substantially parallel with physiological feature image-acquisition area direction.Such as, when finger is placed in physiological feature image-acquisition area by user, decay will be produced to launched hyperacoustic vibration.
As shown in Figure 5, described method comprises the steps.
First, in step S501, each control in described 1 to the n-th ultrasonic transmitting element launches ultrasound wave successively according to predesigned order.
Then, in step S502, according to the firing order of described 1 to the n-th ultrasonic transmitting element, based on pre-defined rule, that receive ultrasonic wave receive unit corresponding in described 1 to the n-th ultrasonic wave receive unit, due to the first object in first area corresponding on described first surface after decaying ultrasound wave processes, to obtain the faultage image of the first object in described physiological feature image-acquisition area, i.e. described physiological feature image.
Pre-defined rule described here can be above described image reconstruction principle.Particularly, it can be Filtered Back-projection, also can be matrix method, iterative method, Fourier algorithm etc.In a word, described pre-defined rule is the principle of rebuilding faultage image based on computed tomography.
According in the physiological feature image acquiring method of the embodiment of the present invention, described 1 to the n-th ultrasonic transmitting element can be controlled and launch ultrasound wave successively according to the order from 1 to n.Or, also can control described 1 to the n-th ultrasonic transmitting element and launch ultrasound wave successively according to out of order.
Further, according in the physiological feature image acquiring method of the embodiment of the present invention, only can control a ultrasonic transmitting element at every turn and launch ultrasound wave.Or, also can control multiple ultrasonic transmitting element at every turn and launch ultrasound wave simultaneously.
As a kind of possible embodiment, according in the physiological feature image acquiring method of the embodiment of the present invention, can using the line of the current ultrasonic transmitting element launched and described first object the ultrasonic wave receive unit of process as the ultrasonic wave receive unit of described correspondence.In this case, the complexity of date processing is lower, and processing speed is very fast.
Specifically, the position of finger touch can first be obtained.Such as, this position can be obtained by the detection of touch screen.Then, based on position and the touch location of ultrasonic transmitting element, calculate the line equation of the two.Finally, based on the arrangement position of this line equation and ultrasonic wave receive unit, the ultrasonic wave receive unit crossing with this line equation is calculated.
But, the hyperacoustic ultrasonic wave receive unit received after the first object decay may be not limited only to the line of the above described current ultrasonic transmitting element launched and described first object (being illustrated as finger in figure) the ultrasonic wave receive unit of process.In fact, the even all ultrasonic wave receive unit of portion of ultrasonic sound wave receiving element can receive the ultrasound wave of differential declines degree.Therefore, as the embodiment that another kind is possible, described processing unit can using all the first object in corresponding first area and hyperacoustic ultrasonic wave receive unit after decaying of receiving on described first surface all as the ultrasonic wave receive unit of described correspondence.Owing to needing to process the signal received by multiple ultrasonic wave receive unit, therefore the complexity of date processing is higher, and processing speed is comparatively slow, but precision is higher.
Up to now, physiological feature image acquiring device according to the embodiment of the present invention and method is described by Fig. 1 to Fig. 5.By according to the physiological feature image acquiring device of the embodiment of the present invention and method, compared with capacitance type detector of the prior art, significantly reduce equipment complexity.In addition, owing to only needing ultrasonic transmitting element and the ultrasonic wave receive unit of placing some around surveyed area, therefore concrete detection position is unrestricted comparatively speaking, as long as be arranged in surveyed area, and the region area that can perform detection is larger.Compared with supersonic detection device of the prior art, particularly when the area of surveyed area is larger, owing to only need place around region but not whole region laying sonac, therefore while guaranteeing large-area surveyed area, reduce further cost.
It should be noted that, in this manual, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thus make to comprise the process of a series of key element, method, article or equipment and not only comprise those key elements, but also comprise other key elements clearly do not listed, or also comprise by the intrinsic key element of this process, method, article or equipment.When not more restrictions, the key element limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment comprising described key element and also there is other identical element.
Finally, also it should be noted that, above-mentioned a series of process not only comprises with the order described here temporally process that performs of sequence, and comprises process that is parallel or that perform respectively instead of in chronological order.
Through the above description of the embodiments, those skilled in the art can be well understood to the mode that the present invention can add required hardware platform by software and realize, and can certainly all be implemented by software.Based on such understanding, what technical scheme of the present invention contributed to background technology can embody with the form of software product in whole or in part, this computer software product can be stored in storage medium, as ROM/RAM, magnetic disc, CD etc., comprising some instructions in order to make a computer equipment (can be personal computer, server, or the network equipment etc.) perform the method described in some part of each embodiment of the present invention or embodiment.
Above to invention has been detailed introduction, applying specific case herein and setting forth principle of the present invention and embodiment, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (10)
1. a physiological feature image acquiring device, comprising:
1 to the n-th ultrasonic transmitting element, places, for launching ultrasound wave around physiological feature image-acquisition area;
1 to the n-th ultrasonic wave receive unit, places, for receiving ultrasound wave around described physiological feature image-acquisition area;
Control unit, launches ultrasound wave for each control in described 1 to the n-th ultrasonic transmitting element successively according to predesigned order; And
Processing unit, for the firing order according to described 1 to the n-th ultrasonic transmitting element, based on pre-defined rule, that receive ultrasonic wave receive unit corresponding in described 1 to the n-th ultrasonic wave receive unit, due to the first object in first area corresponding on described first surface after decaying ultrasound wave processes, to obtain physiological feature image
Wherein n be greater than 1 natural number.
2. physiological feature image acquiring device according to claim 1, wherein along a closed curve, with the 1 to the n-th ultrasonic transmitting element described in arranged at predetermined intervals and described 1 to the n-th ultrasonic wave receive unit.
3. physiological feature image acquiring device according to claim 1, wherein said control unit controls one or more ultrasonic transmitting element at every turn and launches ultrasound wave simultaneously.
4. physiological feature image acquiring device according to claim 1, wherein said processing unit using the line of the current ultrasonic transmitting element launched and described first object the ultrasonic wave receive unit of process as the ultrasonic wave receive unit of described correspondence.
5. physiological feature image acquiring device according to claim 1, the hyperacoustic ultrasonic wave receive unit of wherein said processing unit using the first object in all first areas receiving correspondence on described first surface after decaying is all as the ultrasonic wave receive unit of described correspondence.
6. physiological feature image acquiring device according to claim 1, wherein ultrasonic transmitting element and ultrasonic transmitting element are integrated into same unit, and switch emission state and accepting state by described control unit.
7. a physiological feature image acquiring method, be applied to a physiology characteristic image acquisition device, described physiological feature image acquiring device comprises: the 1 to the n-th ultrasonic transmitting element, places, for launching ultrasound wave around physiological feature image-acquisition area; 1 to the n-th ultrasonic wave receive unit, place around described physiological feature image-acquisition area, for receiving ultrasound wave, described method comprises:
Each control in described 1 to the n-th ultrasonic transmitting element launches ultrasound wave successively according to predesigned order; And
According to the firing order of described 1 to the n-th ultrasonic transmitting element, based on pre-defined rule, that receive ultrasonic wave receive unit corresponding in described 1 to the n-th ultrasonic wave receive unit, due to the first object in first area corresponding on described first surface after decaying ultrasound wave processes, to obtain described physiological feature image
Wherein n be greater than 1 natural number.
8. physiological feature image acquiring method according to claim 7, wherein the one or more ultrasonic transmitting element of each control launches ultrasound wave simultaneously.
9. physiological feature image acquiring method according to claim 7, wherein using the line of the current ultrasonic transmitting element launched and described first object the ultrasonic wave receive unit of process as the ultrasonic wave receive unit of described correspondence.
10. physiological feature image acquiring method according to claim 7, the hyperacoustic ultrasonic wave receive unit wherein using the first object in all first areas receiving correspondence on described first surface after decaying is all as the ultrasonic wave receive unit of described correspondence.
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