CN103163136B - Method for distinguishing concrete working degree in real time by virtue of mixing process image - Google Patents

Abstract

The invention discloses a method for distinguishing concrete working degree in real time by virtue of a mixing process image in the technical field of concrete working degree detecting techniques, which is used for providing a decision basis for adjustment of mix proportion in a mixing process. The method comprises the steps of acquiring image information of concrete in real time in the mixing process of a mixer; acquiring the shape characteristic of the concrete according to the image information of the concrete; and distinguishing the working degree of the concrete according to the shape characteristic of the concrete. The method provided by the invention can be used for distinguishing the working degree in the concrete mixing process, thus improving the mix proportion design efficiency in a laboratory, and reducing waste on economy and time caused by unqualified working degree of the concrete in a construction site.

Description

Utilize the method for mixing and stirring procedural image real time discriminating concrete work degree

Technical field

The invention belongs to concrete work degree detection technique field, particularly relate to a kind of method that procedural image real time discriminating concrete work degree is mixed and stirred in utilization.

Background technology

Concrete serviceability detects for concrete mix-design and ensures that construction quality is very important.Concrete various workability index (comprising the slump, slump flow test, V funnel time, T50 time etc.) can adopt the tests such as slump flow test is tested, V funnel testing (or T50 test) to detect.Also various knockdown concrete work degree determining instrument is had to detect concrete and various serviceability uniformly in addition.As a rule, after each tray concrete goes out machine, (before building) all will carry out workability inspection.

Although there is various way to evaluate concrete work in every degree index, all measurement means are all after concrete goes out machine, carried out the measurement of workability index by the testing staff be correlated with corresponding detecting instrument.This brings three class problems: one is lost labor and time, has interrupted the continuous seepage that concrete is possible; Two is all kinds of detecting instrument and smooth place will be provided for detection at building-site; Three be testing after going out machine, once serviceability does not meet the demands, so whole tray concrete can only be discarded.Therefore, at present in the urgent need to a kind of can in the process of mixing and stirring the method for real-time automatic discrimination concrete work degree.

Summary of the invention

In order to overcome shortcomings and deficiencies of the prior art, the object of the present invention is to provide a kind of concrete work degree method of discrimination, the method can while the process of mixing and stirring is carried out the concrete workability of real time discriminating.

To achieve these goals, the technical scheme that the present invention proposes is that the method for procedural image real time discriminating concrete work degree is mixed and stirred in a kind of utilization, it is characterized in that, described method comprises:

Step 1: mix and stir the concrete image information of Real-time Collection in process at stirring machine;

Step 2: according to the concrete shape facility of concrete image information acquisition;

Step 3: differentiate concrete workability according to concrete shape facility.

Described concrete shape facility is the inner edge boundary line of concrete image information and/or the boundary line, outside of concrete image information.

Describedly differentiate that concrete workability specifically judges concrete workability according to the inner edge boundary line of concrete image information and the boundary line, outside of concrete image information according to concrete shape facility.

Describedly differentiate that concrete workability specifically judges concrete workability according to the inner edge boundary line of concrete image information or the boundary line, outside of concrete image information according to concrete shape facility.

The method that the present invention proposes can carry out the differentiation of workability while mixing concrete, adjustment for match ratio in whipping process can provide decision-making foundation on this basis, thus greatly improve the efficiency of laboratory mix-design and reduce the economy and temporal waste that building-site causes because concrete work degree is defective.

Accompanying drawing explanation

Fig. 1 is the schematic diagram that stirring machine mixes and stirs the concrete image information of Real-time Collection in process;

Fig. 2 is a frame key frame images of the process of mixing and stirring of image capture device shooting in embodiment 1;

Fig. 3 utilizes the image in Fig. 2 and its previous frame image to carry out the image that image reducing obtains the difference of two two field pictures;

Fig. 4 carries out global threshold to Fig. 3 to split the bianry image obtained;

Fig. 5 is the outer boundary line image be separated from concrete image information;

Fig. 6 is the inner boundary line image be separated from concrete image information;

Fig. 7 is that the average height difference between inner edge boundary line and boundary line, outside calculates schematic diagram;

Fig. 8 is a frame key frame images of the process of mixing and stirring of image capture device shooting in embodiment 2;

The result figure that Fig. 9 utilizes the outside boundary line matching of least square method to image shown in Fig. 8 to obtain.

Embodiment

Below in conjunction with accompanying drawing, preferred embodiment is elaborated.It is emphasized that following explanation is only exemplary, instead of in order to limit the scope of the invention and apply.

Embodiment 1: utilize the inner edge boundary line in concrete image information and boundary line, outside to judge concrete slump flow test.

Concrete implementation step comprises:

Step 1: mix and stir the concrete image information of Real-time Collection in process at stirring machine.

To gather concrete image information can be above stirring machine material outlet or stir in cabin arrange collecting device (as video camera, camera, thermal camera or other can obtain the equipment of stirring machine inner concrete shape facility), lighting device is set if desired, the shape information of Real-time Collection concrete in stirring machine while the process of mixing and stirring is carried out.

Fig. 1 is the schematic diagram that stirring machine mixes and stirs the concrete image information of Real-time Collection in process.As shown in Figure 1, one support 1002 is set on concrete mixer 1001 side.On support, still image collecting device 1003(arranges lighting source 1004 if desired), make image capture device can photograph stirring machine internal image by the material outlet of stirring machine.Use stirring machine mix and stir concrete, while the process of mixing and stirring is carried out, use image capture device shooting mix and stir process realtime graphic and by image transmitting in coupled opertaing device (computer) 1005.Opertaing device utilizes the workability of image processing method real time discriminating stirring machine inner concrete.

Step 2: according to the concrete shape facility of concrete image information acquisition.According to the concrete shape facility of concrete image information acquisition specifically: from concrete image information, inner edge boundary line and boundary line, outside are separated.

Fig. 2 is a frame key frame images of the process of mixing and stirring of image capture device shooting.As shown in Figure 2, inner edge boundary line and boundary line, outside refer to concrete mixer blade in whipping process stir the separatrix between concrete parts and background of carrying.Border away from stirring arbor is boundary line, outside (in Fig. 2 solid white line), is inner edge boundary line (in Fig. 2 white dashed line) near the border of stirring arbor.

(1) boundary line, concrete image information China and foreign countries is obtained.

First, utilize the image in Fig. 3 and its previous frame image to carry out image reducing, obtain the poor Δ of two two field pictures, as shown in Figure 3.

Afterwards, utilize the adaptive threshold fuzziness method of single threshold to carry out global threshold segmentation to Δ and obtain bianry image Δ _bas shown in Figure 4.

Finally, for Δ _b, obtain the peak of each row in display foreground pixel as outer boundary, as shown in lines white in Fig. 5.

(2) inner edge boundary line in concrete image information is obtained.

First, the adaptive threshold fuzziness of dual threshold is utilized to solve height two threshold values of the image shown in Fig. 2.

Secondly, two threshold values calculated are used to carry out watershed segmentation to image shown in Fig. 2.

Finally, using the net result of watershed algorithm as inner edge boundary line, as shown in Fig. 6 solid line.

Step 3: judge concrete slump flow test according to inner edge boundary line and boundary line, outside.

Inner edge boundary line and boundary line, outside is utilized jointly to judge concrete slump flow test specifically:

First, the average height difference between inner edge boundary line and boundary line, outside is calculated.

Average height difference between inner edge boundary line and boundary line, outside adopts formula:

$H_{\mathrm{avg}}=\frac{A}{d}---\left(1\right)$

Calculate.As shown in Figure 7, A is the area of enclosing region between inner edge boundary line and boundary line, outside, and d is region transverse width for this reason.

Then, concrete slump flow test is calculated according to the average height difference between inner edge boundary line and boundary line, outside.Its formula is as follows:

$\mathrm{SF}=\frac{(H_{\mathrm{avg}}-a)}{b+c(W/C)}---\left(2\right)$

Wherein, H _avgthe inner and outer boundary line average height difference obtained for utilizing formula (1), a, b and c are the constant (in the present embodiment, a=285, b=0.3011, c=-0.4116) tested and determine, W/C is concrete volume water-cement ratio.The inner and outer boundary average height difference obtained from image is in the present embodiment 208mm, is 697mm according to the slump flow test that formula (2) calculates, and using slump flow test to test the actual tests result obtained is 690mm.Within the scope that slump flow test specifies in specification, can judge that concrete slump flow test meets the demands.

Embodiment 2: utilize boundary line, outside to judge the concrete V funnel time.

Concrete implementation step comprises:

Step 1: mix and stir the concrete image information of Real-time Collection in process at stirring machine.Detailed implementation process with embodiment 1 step 1 described in.Fig. 8 is a frame key frame images of the process of mixing and stirring using image capture device to take in the present embodiment.

Step 2: according to the concrete shape facility of concrete image information acquisition.According to the concrete shape facility of concrete image information acquisition specifically:

From concrete image information, boundary line, outside is separated.Detailed implementation process is with embodiment 1 step 2(1) described in.

Step 3: judge the concrete V funnel time according to boundary line, outside.

First, the external boundary line of least square method is utilized to carry out matching, the flex point horizontal ordinate in the boundary line, outside after digital simulation.

Utilize Logistic equation to carry out least square regression to outer boundary, wherein Logistic equation form is as follows:

$Y=a+\frac{b}{1+c\·e^{\mathrm{dX}}}---\left(3\right)$

A, b, c and d are regression parameter.

For the boundary line, outside from Fig. 8, least square fitting is utilized to become Logistic curve.The curve equation of matching is:

$Y=546-\frac{581}{{1+338e}^{-0.00959X}}---\left(4\right)$

Fitting result as shown in Figure 9.Point range in the boundary line, outside that figure orbicular spot expression image procossing way obtains, curve is return the Logistic curve obtained.

Secondly, the Logistic point of inflexion on a curve horizontal ordinate that digital simulation goes out, its computing formula is as follows:

$X_{\inf }=\frac{1}{d}\·\log \left(\frac{1}{c}\right)---\left(5\right)$

Wherein, X _inffor the flex point horizontal ordinate in the boundary line, outside after matching, c and d is corresponding regression parameter in formula (4).In Fig. 9, triangle form point is the outer boundary point of inflexion on a curve after matching.

Finally, the concrete V funnel time is judged according to boundary line, the outside flex point horizontal ordinate after matching.

According to test findings, work as X _infduring > 200, namely the V funnel time more than 25s, will exceed the requirement of specification.Formula (5) can be used to calculate the flex point horizontal ordinate X of the present embodiment outer boundary _inf=607.Therefore judge that in the present embodiment, the concrete V funnel time is more than 25s.The actual tests result using V funnel testing to obtain is 76.5s, thus concrete workability exceeds code requirement.

Should be noted that, in above-described embodiment 1 and 2, obtaining the process in concrete image information boundary line, China and foreign countries and inner edge boundary line, is only the example that the present invention proposes, and boundary line and inner edge boundary line are not limited to said process at home and abroad to obtain concrete image information.In addition, the slump flow test used in the present invention and V funnel Method Of Time Measurement formulate " self-compacting concrete application technology code " (CECS203:2006) according to China Engineering Construction Standardization Association.

The beneficial effect of method provided by the invention is:

1. propose the method utilizing shape information to analyze workability during mixing concrete, possess real-time, robotization and contactless feature.

2. the concrete inner and outer boundary wire shaped information utilizing blade of stirrer to stir differentiates can replace the method for concrete work degree traditional concrete work degree detection experiment, be applied to engineering site and laboratory examination.

3. the concrete work degree method of discrimination that the present invention proposes simplifies trace routine, can save a large amount of manpower and time, for concrete production robotization truly and serialization provide the foundation.

4. the concrete work degree method of discrimination that the present invention proposes can carry out the differentiation of workability while mixing concrete, adjustment for match ratio in whipping process can provide decision-making foundation on this basis, greatly can improve the efficiency of laboratory mix-design and reduce the economy that causes because concrete work degree is defective of building-site and temporal waste.

The above; be only the present invention's preferably embodiment, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claim.

Claims (1)

1. a method for procedural image real time discriminating concrete work degree is mixed and stirred in utilization, and it is characterized in that, described method comprises:

Step 1: mix and stir the concrete image information of Real-time Collection in process at stirring machine;

Step 2: according to the concrete shape facility of concrete image information acquisition;

Described concrete shape facility is the inner edge boundary line of concrete image information and/or the boundary line, outside of concrete image information;

Step 3: differentiate concrete workability according to concrete shape facility, be specially: utilize inner edge boundary line and boundary line, outside jointly to judge concrete slump flow test, or judge the concrete V funnel time according to boundary line, outside;

Inner edge boundary line and boundary line, outside is utilized jointly to judge that concrete slump flow test comprises:

1) according to formula calculate the average height difference between inner edge boundary line and boundary line, outside; A is the area of enclosing region between inner edge boundary line and boundary line, outside, and d is region transverse width for this reason;

2) calculate concrete slump flow test according to the average height difference between inner edge boundary line and boundary line, outside, its formula is: h _avgfor inner and outer boundary line average height difference, a, b and c are the constant tested and determine, W/C is concrete volume water-cement ratio;

Judge that the concrete V funnel time comprises according to boundary line, outside:

1) the external boundary line of least square method is utilized to carry out matching;

2) the flex point horizontal ordinate X in the boundary line, outside after digital simulation _inf;

3) the concrete V funnel time is judged according to boundary line, the outside flex point horizontal ordinate after matching.