CN101866480B - Frame correlation processing method and system in spatial compound imaging - Google Patents
Frame correlation processing method and system in spatial compound imaging Download PDFInfo
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Abstract
The invention discloses a frame correlation processing method and a system in spatial compound imaging. The system comprises a same-angle frame correlation processor and a frame correlation coefficient calculator, wherein the same-angle frame correlation processor is used for receiving component images output by a B signal preprocessor, conducting frame correlation processing to the component images with the same deflection angle, and outputting results obtained after frame correlation processing to a spatial compound image processor; and the frame correlation coefficient calculator is used for calculating frame correlation coefficients during frame correlation processing according to the relevant parameters of a spatial compound imaging controller, and outputting results to the same-angle frame correlation processor. Aiming at the defects of a simple image processing method of using spatial compounding in combination with frame correlation, the frame correlation processing is put ahead of the spatial compounding, the same-angle frame correlation processing is adopted, the same-extent de-noising processing is conducted to different-angle information in advance before the spatial compounding and then the different-angle information is superimposed together, thereby avoiding image information disorder and not causing obvious boundaries in different areas of the images.
Description
Technical field
The present invention relates to the complex technique in ultrasonic system, be specifically related to the frame correlation processing method in a kind of spatial compound imaging and system.
Background technology
In B-mode ultrasonography, the impacts such as the quality of image is subject to speckle noise, sound shadow, ultrasonicly loses, reverberation, the mechanism of production of these factors is different, as speckle noise (speckle noise) is determined because of Number synthesis to the distance etc. of probe by the distribution of scattering in imaging thing and they, make speckle image occurring light and shade replaces; Ultrasonic losing to make echo fail to be popped one's head in reception because reflection angle is comparatively large, on image, exhibit tissue interface is discontinuous; There is dark space and sound shadow after strong echo, details wherein can not be seen clearly; The ultrasound wave of vertical incidence forms multiple reflections and produces pseudomorphism (reverberation) etc. between probe and acoustic interface.Compound (compounding) technology is often used to improve ultrasonograph quality, comprises space compound, frequency multiplexed and time compound.
Multi-angle space complex technique in the complex technique of space is deflected by the multi-angle of sweep trace, from different directions echo-wave imaging is carried out to target area, obtain the component drawings picture (component image) of different deflection angle, these component drawings pictures carry out according to certain method the combination picture that space compound obtains comprising multi-angle information.The speckle noise caused due to the incidence of different angles has more weak correlativity, echo signal then has stronger correlativity, therefore multiple component drawings is enhanced as echo signal after composite computing, and speckle noise then weakens relatively, thus improves the contrast of target in image.The sound shadow produced due to different deflection angle and ultrasonic to lose region not overlapping, effectively can reduce sound shadow and the ultrasonic impact lost by multi-angle component drawings as compound.And reverberation produces when the strong reflection interface vertical with acoustic beam usually, by deflection acoustic beam, make acoustic beam and this reflecting interface out of plumb, thus avoid the generation of reverberation, therefore just can be effectively reduced the impact of reverberation by multi-angle component drawings as compound.As can be seen here, can be weakened by multi-angle space compound and even eliminate these image deflects, improve the quality of Type B ultrasonoscopy.
Time complex technique and frame correlation technique, because it is embodied as, this is lower and reduce spatial resolution hardly, and adopt by all ultrasonic image-forming systems.Random noise not in the same time in ultrasonoscopy is uncorrelated, on average effectively can improve signal noise ratio (snr) of image therefore by different time chart picture; Although the speckle noise that static target produces is not random, but in fact the motion of people's in-vivo tissue and the motion of ultrasonic probe all can change speckle noise, therefore the speckle noise in different frame ultrasonoscopy also has more weak correlativity usually, thus utilize multiple image averaging can reduce the impact of speckle noise equally, improve the contrast resolution of image.
From the above mentioned, can further eliminate or reduce speckle noise, sound shadow in conjunction with the associating complex technique that space compound is relevant with frame, ultrasonicly to lose, the impact on image such as reverberation, improve picture quality, then also there is certain problem in this simple compound implementation.In general, in prior art usually under spatial compound imaging pattern, the frame carrying out common B imaging is correlated with, do like this and can run into two problems: first: the position that frame is relevant must be carried out after the compound of space, otherwise different angles information is added to together without registration, cause image information disorderly; Second: be correlated with if carry out frame after the compound of space, the zones of different of image may be caused to occur obvious border.Because under the compound of space, the frame per second of the actual renewal of image zones of different after compound is different, as Fig. 1, when three frame compounds, reason combination picture due to deflection image has three regions, wherein left and right is the result of two frame compounds, centre is the result of three frame compounds, if carry out frame to the image after compound to be correlated with, then same related coefficient has all been used in region, three, left, center, right, so the frame relevant effect of zone line will be better than the region on both sides, signal to noise ratio (S/N ratio) and the temporal resolution difference of zones of different on same piece image will be caused like this, visible border can be produced at zones of different adjacent at the space compound tense of more multiframe number.
There is certain defect in visible prior art, need to improve further.
Summary of the invention
The object of the present invention is to provide the frame correlation processing method in a kind of spatial compound imaging and system, it by increasing same angle frame relevant treatment before the compound of space, avoids Pure Space compound and add the problem that obvious border appears in the disorderly and image of image information that frame is correlated with run into.
To achieve these goals, the present invention adopts following technical scheme:
The invention provides the frame correlation processing method in a kind of spatial compound imaging, it comprises:
A, the component drawings picture with equal deflection angle is carried out frame relevant treatment;
B, utilize described frame relevant treatment after component drawings picture carry out space compound processing, generate combination picture.
Based on said method, present invention also offers a kind of spatial compound imaging system, comprise spatial compound imaging controller, space combination picture processor and B signal preprocessor, also comprise: with angle frame associative processor, for receiving the component drawings picture that described B signal preprocessor exports, and the component drawings picture with equal deflection angle is carried out frame relevant treatment, and the result after frame relevant treatment is inputed in the combination picture processor of described space; Frame correlation coefficient counter, for calculating frame correlation coefficient during frame relevant treatment according to the correlation parameter of spatial compound imaging controller, and inputs to described same angle frame associative processor by result.
Invention effect: the deficiency that the present invention is directed to the image processing method that simple application space mixed binding frame is correlated with, frame correlation technique under the composite mode of space and system thereof are proposed, before frame relevant treatment is placed in space compound, and adopt with angle frame relevant treatment, make just to carry out equal extent ground denoising to the information of different angles in advance before the compound of space, and then be superimposed together, avoid image information chaotic, the zones of different of image also can not be caused to occur obvious border simultaneously.
Accompanying drawing explanation
Fig. 1 is the component drawings picture representing different deflection angle;
Fig. 2 is the schematic diagram of space composite computing;
Fig. 3 is Real time compound imaging schematic diagram;
Fig. 4 is the structural representation of spatial compound imaging system of the present invention;
To be the present invention realize block diagram with the inside of angle frame associative processor to Fig. 5.
Embodiment
Specific implementation of the present invention is described in detail below with reference to accompanying drawing.
In order to space compound and frame relevant treatment effectively be combined, and improve picture quality, the present invention proposes the frame correlation processing method in a kind of new spatial compound imaging, it comprises the following steps:
First, the component drawings picture with equal deflection angle is carried out frame relevant treatment; Then, utilize the component drawings picture after described frame relevant treatment to carry out space compound processing, generate combination picture.Here component drawings picture can be the image of the same deflection angle in adjacent deflection cycle, also can be the image of the same deflection angle in non-conterminous deflection cycle.
From upper, the present invention added the frame correlation procedure of a step with angle frame before space compound processing, thus avoid and exist in prior art, when space compound relevant to normal frames in conjunction with time the image information registration, the image information that easily occur disorderly and image compound after there is the problem on obvious border.Before space compound processing being placed in angle frame correlation procedure, then can carry out denoising to the component drawings picture of different angles in advance, effective raising signal noise ratio (snr) of image, reduce the impact of speckle noise, improve the contrast resolution of image, carrying out compound tense between real-time empty like this, because be identical to the denoising degree of zones of different, can not the synthesis quality of effect diagram picture, not easily there is obvious border.
There are following three important links in spatial compound imaging process of the present invention:
The first, be deflected into the control procedure of picture, it can obtain the component drawings picture of different deflection angle.
The object being deflected into picture is the space compound processing link coordinated below, produces the component drawings picture of different scanning deflection angle.Be deflected into the component drawings picture of the different deflection angles of the generation of picture as shown in Figure 1, in Fig. 1, C (0,1) is expressed as the component drawings picture without deflection, C (0,0) be expressed as the image deflecting N degree left, C (0,2) is expressed as the image deflecting N degree to the right.Be deflected into the number that picture controls to determine according to different space compound gears different deflection scanning angle component image, the frame number in the one-period namely under current composite mode or angle number.
Typical apply is corresponding 1 the scan deflection angle of gear 0, corresponding 3 the scan deflection angles of gear 1, corresponding 5 the scan deflection angles of gear 2.Only having a scan deflection angle during gear 0, is non-deflection scanning.The angle number of gear 1 and gear 2 is odd number, and wherein needing an angle is the angle not deflecting emission scan, and remaining even number angle is deflection emission scan corresponding to deflection angle.Such as, during gear 1, one of them scanning emission angle is non-deflection scanning (also can be considered 0 angle), and other 2 angles are respectively relative to 0 angular emission left avertence 10 degree scanning and right avertence 10 degree scanning.
Being deflected into picture controls as periodically controlling, and is the cycle according to the different deflection angle assembly picture number of setting.In each cycle, the generation order of different deflection angle component drawings picture can be configured by configuration data file, and typical order, for shown in Fig. 1, first produces left avertence image, then produces non-deflection image, finally produces right avertence image.Order for the number of deflection scanning emission angle of different gear, the angle of deflection and transmitting is all configured by configuration data file.
The second, with angle frame correlation procedure, its process is as follows:
1, receive current component image, obtain the deflection angle that current component image is corresponding;
2, according to current component image, search the component drawings picture after frame relevant treatment corresponding to same deflection angle, usually all can the component drawings picture of buffer some amount when carrying out spatial compound imaging, data buffer storage can be carried out with a predetermined length for base unit here, be convenient to follow-up image procossing;
3, frame correlation coefficient is calculated, here frame correlation coefficient is for concrete a certain two field picture, the frame correlation coefficient of its all pixel can use same value, also different coefficients can be calculated for each pixel, this frame correlation coefficient is the function about a variable, and variable here at least comprises: the frame number in frame per second, deflection cycle, assembly image pixel intensity average, for the component drawings of frame relevant treatment as the difference of same position pixel, component drawings as one of the pixel brightness value of same position.
4, utilize the frame correlation coefficient calculating and obtain, current component image and the component drawings picture found are weighted summation, obtain the component drawings picture after frame relevant treatment.
In spatial compound imaging process of the present invention, need the every frame component drawings to uploading to carry out same angle frame relevant treatment as x (n) before carrying out space compound, its frame correlation computations formula is:
y(n)＝α[y(n-kN)-x(n)]+x(n)，0＜α＜1，k＝1，2，3，... (1)
Wherein, y (n) is frame correlation calculation result, N is the frame number (or angle number) in the one-period under current composite mode, α is frame correlation coefficient, for concrete a certain two field picture, the frame correlation coefficient of its all pixel can use same value, also can calculate different coefficients for each pixel.
The above-mentioned frame correlation coefficient α that mentions is function about one or more variable, and this function can have many forms, such as gets part oppositely proportion function, exponential function etc.The computing formula of frame correlation coefficient will be enumerated one by one below.
The first form, to adopt when frame correlation coefficient calculates be the end with e, index gets negative exponential function, and its index absolute value is got: the inverse of the business of frame number in current frame rate and deflection cycle,
Wherein, FR is frame per second, and C is constant, and N is the angle number under current composite mode, the frame number namely in a deflection cycle, and this angle number is determined by the gear of spatial compound imaging controller.
The second form, functional form is: the business of frame number and the inverse of a sum in current frame rate and deflection cycle:
The third form, to adopt when frame correlation coefficient calculates be the end with e, index gets negative exponential function, and its index absolute value is got: the absolute value of the difference of two frame assembly image pixel averages adds two frame assembly image pixel means of mean,
Wherein, x represents average, C is constant, N is the angle number under current composite mode, this angle number is determined by the gear of spatial compound imaging controller, x (n-kN) represents the brightness average of pixel in the n-th-kN two field picture, and x (n) represents the brightness average of pixel in the n-th two field picture.
4th kind of form, the computing formula of frame correlation coefficient is:
α(i，j)＝exp[-C×Motion(i，j)]，C＞0 (5)
Wherein, C is constant, and N is the angle number under current composite mode, and this angle number is determined by the gear of spatial compound imaging controller.X (i, j, n) represents (i in the n-th two field picture, j) brightness value of some place pixel, n or n-kN represents the deflection cycle that this pixel is positioned at, and T represents luminance threshold, and the brightness being only greater than this value just participates in calculating kinematic variables Motion, S represents the controling parameters of a brightness, usually, S >=0,0≤T≤Max, Max is pixel intensity maximal value, and 8bit image is 255.
In order to improve system real time, the mode of fixed coefficient can be adopted to calculate frame correlation coefficient, such as above-mentioned first, second, third form, wherein first two form adopts current frame rate FR to calculate α; The account form of certainly fixing frame correlation coefficient is not limited to above-mentioned three kinds of formula, can be other forms of function.Except adopting the frame relevant way of fixed coefficient, also the frame of on-fixed coefficient can be adopted to be correlated with, different frame correlation coefficients is adopted when frame relevant treatment is carried out to pixel each in frame, such as above-mentioned 4th kind of form, for different points calculates different frame correlation coefficients, to the frame relevant treatment that the point of different motion degree can carry out in various degree.
Three, space compound processing:
After image being finished to same angle frame relevant treatment, result is proceeded to space compound processing module to process, first do difference with frame correlated results last time of this angle, and by difference image and last time space compound result go to carry out the space compound result that space compound obtains this.So often there is a frame to do with the relevant image of angle frame, just in space compound processing module, process out a frame combination picture.Here space compound processing process is not unique, can also adopt other space compound processing modes.
Based on said method, the present invention, in order to realize above-mentioned functions in imaging system, also needs to improve as follows.
As shown in Figure 4, usual spatial compound imaging system, comprise following components: probe 100, received beam compositor 120, launching beam compositor 140, digital scan convertor 160, display 170, spatial compound imaging controller 180, space combination picture processor 150, B signal preprocessor 130.In Fig. 4 spatial compound imaging controller 180 according to practical application need determine the angular dimension of scan deflection and the number of component drawings picture, and by control transmitting and receiving delay and focusing parameter, realize control transmitting and receiving scanning beam deflection.The signal received effectively extracts effective frequency component in echo through dynamic filter, improves the signal to noise ratio (S/N ratio) of echoed signal, then extracts the envelope information of echoed signal.The envelope signal extracted, after the process such as log-compressed, produces the component drawings picture of different deflection angle, for the process of follow-up space compound.
The present invention adds same angle frame associative processor 200 and frame correlation calculator 190 on this basis, with the component drawings picture that angle frame associative processor 200 exports for receiving B signal preprocessor 130, and the component drawings picture with equal deflection angle is carried out frame relevant treatment, and the result after frame relevant treatment is inputed in space combination picture processor 150; Frame correlation coefficient counter 190, for calculating frame correlation coefficient during frame relevant treatment according to the correlation parameter of spatial compound imaging controller 180, and inputs to described same angle frame associative processor 200 by result.Like this can the impact of stress release treatment, produce the component drawings picture that signal to noise ratio (S/N ratio) is higher, then carry out with the component drawings picture that stores in internal memory the image that combination picture process produces space compound.Combination picture is delivered to display and is shown after digital scanning conversion (DSC).
As shown in Figure 5, comprise with angle frame associative processor 200: result memory 202, for storing the result images after described frame relevant treatment; Angular sorting device 201, for the deflection angle according to the current component image received, in described result memory, searches the result images after the frame relevant treatment with equal deflection angle; Frame correlation calculator 203, carries out frame relevant treatment for the result images that finds according to described angular sorting device and current component image, obtains the result images after frame relevant treatment.
As can be seen from the same angle frame associative processor structured flowchart that Fig. 5 provides, the specific implementation step of every frame component drawings picture of input being carried out to same angle frame relevant treatment is as follows:
(1) the relevant initial phase of frame is being started, parameter needed for frame correlation computations (as high in constant coefficient C, figure image width, system frame per second FR) is set, these parameters are stored in storer, and initialization for store all intermediate values relevant with frame after the result memory 202 of result images.
(2) according to the computing formula of above-mentioned frame correlation coefficient α, the frame correlation coefficient under utilizing the parameter of aforementioned storage to calculate composite mode.
(3) utilize angular sorting device 201, obtain the deflection angle that current frame image is corresponding.
(4) corresponding according to present frame component drawings deflection angle, read from storer previous frame or other frames be correlated with angle component picture frame after result images, utilize the frame correlation coefficient obtained, by result images with the image newly gathered according to the weighted sum of frame correlation formula, obtain current component picture frame be correlated with after result images, and result images after being correlated with current component picture frame replace previous frame in result memory be correlated with angle component picture frame after result images, use in order to process next time.
As shown in Figures 2 and 3, which show the schematic diagram of space recombination process.Fig. 1 and Fig. 2 is the process of a frame space compound, and Fig. 1 is the image component form before compound, and Fig. 2 is the image component form after compound.C (1) wherein in Fig. 1 and Fig. 2 is undeflected image component, C (0 in Fig. 1,0) with C (0,2) deflection left and the image component deflecting N degree is to the right respectively, be the size of non-deflection image assembly to make the image of complex superposition, need C in Fig. 1 (0,0) and C (0,2) cut out, effect after cutting out is C (0) in Fig. 2 and C (2) image, obtains Co combination picture in Fig. 2 after then superposing the C (0) in Fig. 2, C (1) and C (2) component drawings picture.Fig. 3 is the process that continuous multiple frames component drawings picture does space compound.Production process due to different angles component drawings picture is periodic, therefore adjacent M (different scanning angle component image number) individual component drawings picture is the component drawings picture of different scanning angle, therefore also space compound processing can be carried out to this M component drawings picture, so continuous print space compound processing is exactly newly add the component drawings picture that a frame angle is the new scanning of Y at every turn, remove the process of M different angles component drawings as Combined Processing that a frame angle is the component drawings picture of the prior scans of Y.Visible, the present invention increased frame correlation procedure before the process of existing image Combined Processing, then can avoid the defect of prior art, frame correlation coefficient is calculated in real time according to space compound gear, the frame information such as gear, frame per second of being correlated with, carry out frame relevant treatment, be conducive to effective combination of frame relevant treatment and space compound, improve the display quality of image.
Illustrating of above-mentioned each concrete steps is comparatively concrete, and therefore can not think the restriction to scope of patent protection of the present invention, scope of patent protection of the present invention should be as the criterion with claims.
Claims (8)
1. the frame correlation processing method in spatial compound imaging, is characterized in that, comprising:
A, the component drawings picture with equal deflection angle is carried out frame relevant treatment, comprising: receive current component image, obtain the deflection angle that current component image is corresponding; According to current component image, search the component drawings picture after frame relevant treatment corresponding to equal deflection angle; Calculate frame correlation coefficient; Utilize the frame correlation coefficient calculating and obtain, current component image and the component drawings picture found are weighted summation, obtain the component drawings picture after frame relevant treatment;
B, utilize described frame relevant treatment after component drawings picture carry out space compound processing, generate combination picture, comprise: after image being finished to same angle frame relevant treatment, result is proceeded to space compound processing module to process, first do difference with frame correlated results last time of this angle, and by difference image and last time space compound result go to carry out the space compound result that space compound obtains this; Often there is a frame to do with the relevant image of angle frame, just in space compound processing module, process out a frame combination picture.
2. method according to claim 1, is characterized in that, described frame correlation coefficient is the function about a variable.
3. method according to claim 2, is characterized in that, described function is take e the end of as, index gets negative exponential function.
4. method according to claim 2, it is characterized in that, described variable at least comprises: the frame number in frame per second, deflection cycle, assembly image pixel intensity average, for the component drawings of frame relevant treatment as the difference of same position pixel, component drawings as one of the pixel brightness value of same position.
5. method according to claim 3, it is characterized in that, the weighted sum of two frame component drawings pictures is carried out according to identical frame correlation coefficient, then the index absolute value of described exponential function is: the inverse of the business of frame number in current frame rate and deflection cycle, the absolute value of the difference of two frame assembly image pixel intensity averages adds two frame assembly image pixel intensity means of mean, one of them.
6. method according to claim 3, it is characterized in that, if adopt different frame correlation coefficients when carrying out the weighted sum of frame relevant treatment for frame component drawings as each pixel, then index absolute value Motion (i, j) of described exponential function is:
Wherein, S represents the controling parameters of a brightness, and N is the frame number in deflection cycle, x (i, j, n) represent the brightness value of (i, j) some place pixel in the n-th two field picture, T represents luminance threshold, x (i, j, n-kN) represents (i in the n-th-kN two field picture, j) brightness value of some place pixel, k be more than or equal to 1 natural integer.
7. method according to claim 2, is characterized in that, carries out the weighted sum of two frame component drawings pictures according to identical frame correlation coefficient, then described function is the business of frame number and the inverse of a sum in current frame rate and deflection cycle.
8. a spatial compound imaging system, comprises spatial compound imaging controller, space combination picture processor and B signal preprocessor, it is characterized in that, also comprise:
With angle frame associative processor, for receiving the component drawings picture that described B signal preprocessor exports, and the component drawings picture with equal deflection angle is carried out frame relevant treatment, and the result after frame relevant treatment is inputed in the combination picture processor of described space;
Frame correlation coefficient counter, for calculating frame correlation coefficient during frame relevant treatment according to the correlation parameter of spatial compound imaging controller, and inputs to described same angle frame associative processor by result;
Described same angle frame associative processor comprises:
Result memory, for storing the result images after described frame relevant treatment;
Angular sorting device, for the deflection angle according to the current component image received, in described result memory, searches the result images after the frame relevant treatment with equal deflection angle;
Frame correlation calculator, carries out frame relevant treatment for the result images that finds according to described angular sorting device and current component image, obtains the result images after frame relevant treatment.
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| JP5272084B2 (en) * | 2012-01-11 | 2013-08-28 | 日立アロカメディカル株式会社 | Ultrasonic diagnostic equipment |
| CN103584882A (en) * | 2012-08-13 | 2014-02-19 | 深圳市蓝韵实业有限公司 | Spatial compound imaging method and device and ultrasonic imaging system |
| CN104546008B (en) * | 2015-02-02 | 2016-09-21 | 声泰特（成都）科技有限公司 | A kind of first-harmonic/harmonic wave merges the formation method combined with space compound |
| KR20170060852A (en) * | 2015-11-25 | 2017-06-02 | 삼성메디슨 주식회사 | Method and ultrasound apparatus for providing ultrasound images |
| CN106344128B (en) * | 2016-10-14 | 2019-09-24 | 汕头市超声仪器研究所有限公司 | A kind of Double-plane probe deflection composite imaging method |
| CN107967670B (en) * | 2016-10-20 | 2020-10-02 | 北京东软医疗设备有限公司 | Spatial compound imaging method and system and ultrasonic imaging equipment |
| CN111278363B (en) | 2017-10-16 | 2022-07-22 | 北京深迈瑞医疗电子技术研究院有限公司 | Ultrasonic imaging equipment, system and image enhancement method for ultrasonic contrast imaging |
| CN111982936B (en) * | 2020-08-25 | 2023-10-10 | 绍兴市特种设备检测院 | X-ray automatic detection device for heat exchanger tube-tube plate welding seam |
| CN112734665B (en) * | 2020-12-31 | 2023-07-14 | 飞依诺科技股份有限公司 | Ultrasonic image time domain filtering method, equipment and medium for weakening motion blur |
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