CN103090816B - Product contour image analyzes system and method - Google Patents

Abstract

The present invention provides a kind of product contour image to analyze system, is applied to calculate device.This system includes a series of functional module, utilize these functional modules, the bidimensional image of the product that this system obtains from the capture of image acquisition equipment collects the some cloud that all profile point of product are constituted, the point cloud all profile point constituted aligns with the theoretical contour on product design model, is calculated the profile tolerance of product further according to the maximum of minimum distance of the profile point in a cloud to theoretical contour and minima.The present invention also provides for a kind of product contour image and analyzes method.

Description

Product contour image analyzes system and method

Technical field

The present invention relates to a kind of computer aided design system and method, especially one are applied to Product contour image in image measurement field analyzes system and method.

Background technology

Product profile tolerance is very important reference parameter during Product Assembly, directly influences Product quality, therefore the measurement to product profile is most important.At present, product profile one is measured As be to utilize the scanner scanning product profile point that obtains on product, then with the reason of product model Opinion profile point carries out computational analysis, obtains the profile tolerance of product.The weak point of this method exists In, need first to read from CAD system the theoretical profile point of product model before scanning product Coordinate, scan product one by one further according to the coordinate control scanner of theoretical profile point and produced Profile point on product, whole measurement process needs handover operation in different software.Additionally, To analysis result be numerical value, although user easily learns whether product profile exists deviation, but It is that user is not easy to connect the concrete position of deviation with product profile, is not easy to location and produces There is the position of deviation with theoretical value on product profile.

Summary of the invention

In view of the foregoing, it is necessary to provide a kind of product contour image to analyze system and method, Can quickly analyze product profile, and deposit with theoretical value according on analysis result positioning product profile Position in deviation.

A kind of product contour image analyzes system, and this system includes profile point acquisition module, profile Curve processing module, profile alignment module and edge analysis module.Profile point acquisition module, uses In the bidimensional image of the product receiving the capture of image acquisition equipment, the most in X direction with Y side To traveling through this bidimensional image, when obtaining different two pixels of continuous two color value every time, Recording one of them pixel with pre-set color value is the profile point of bidimensional image, obtains two The point cloud that all profile point of dimension image are constituted.Contour curve processing module, for setting from storage All theoretical contours are entered by the standby all theoretical contours designed a model reading product Row processes so that all theoretical contours are all located at X/Y plane and all theoretical contours Normal vector direction consistent.Profile alignment module, for by all profile point structures of bidimensional image The point cloud become aligns with theoretical contour.Edge analysis module, for according to the wheel in a cloud Wide point is calculated product to maximum and the minima of the minimum distance of theoretical contour Profile tolerance.

A kind of product contour image analyzes method, and the method includes: (A) receives image acquisition equipment The bidimensional image of the product of capture, travels through this bidimensional image the most in X direction with Y-direction, When obtaining different two pixels of continuous two color value every time, record one of them and have pre- If the pixel of color value is the profile point of bidimensional image, obtain all profile point of bidimensional image The point cloud constituted；(B) all theoretical profiles the designed a model song of product is read from storage device All theoretical contours are processed by line so that all theoretical contours are all located at The normal vector direction of X/Y plane and all theoretical contours is consistent；(C) by the institute of bidimensional image The point cloud having profile point to constitute aligns with theoretical contour；And (D) is according to the profile in a cloud Point is calculated the wheel of product to the maximum of minimum distance of theoretical contour and minima Exterior feature degree.

Compared to prior art, the product contour image that the present invention provides analyzes system and method, Product profile can be quickly analyzed according to the bidimensional image of product, and can be according to analysis result There is the position of deviation with theoretical value on positioning product profile.

Accompanying drawing explanation

Fig. 1 is the functional block diagram that product contour image of the present invention analyzes system preferred embodiment.

Fig. 2 and Fig. 3 is the flow process that product contour image of the present invention analyzes method preferred embodiment Figure.

Fig. 4 (I) and Fig. 4 (II) be from product 2D image gather profile point constitute some cloud and The schematic diagram of product theoretical contour.

Fig. 5 is the schematic diagram of several curves in X/Y plane.

Fig. 6 is to be taken turns with product theory by the some cloud that the profile point gathered in product 2D image is constituted The schematic diagram of wide curve alignment.

Fig. 7 is that the minimum distance according to the profile point in a cloud with product theoretical contour generates The schematic diagram of the adjacent profile point in measurement line and junction point cloud.

Main element symbol description

Calculate device	1
		Image acquisition equipment	2
Product	3
		Product contour image analyzes system	10
Profile point acquisition module	11
		Contour curve processing module	12
Profile alignment module	13
		Edge analysis module	14
Reporting modules	15
		Storage device	20
Processor	30
		Display device	40

Following detailed description of the invention will further illustrate the present invention in conjunction with above-mentioned accompanying drawing.

Detailed description of the invention

Refering to shown in Fig. 1, it it is the merit of product contour image of the present invention analysis system preferred embodiment Can module map.This product contour image is analyzed system 10 and is installed and run on calculating device 1. This calculating device 1 is connected with image acquisition equipment 2.This calculating device 1 includes storage device 20, processor 30 and display device 40.

Image acquisition equipment 2 captures two dimension (2D) image of product 3, and by the two of product 3 Dimension (2D) image store is to storage device 20.

This product contour image is analyzed system 10 and is included profile point acquisition module 11, contour curve Processing module 12, profile alignment module 13, edge analysis module 14 and reporting modules 15.

Storage device 20 stores the relevant information designed a model of product 3, including designing a model The control point information of upper each theoretical contour, and the computerization program of module 11 to 15 Code.Processor 30 performs described computerization program code, according to control point information matching Obtain the theoretical contour on the designing a model of product 3, gather in the 2D image of product 3 Profile point, and calculate profile point and theoretical profile with theoretical contour after profile point being alignd The deviation (concrete introduction refers to the explanation about Fig. 2 and Fig. 3) of curve.

Display device 40 shows on the 2D contour image of product 3, the designing a model of product 3 Theoretical contour, analysis process and analysis result.

Refering to shown in Fig. 2 and Fig. 3, it is that product contour image of the present invention analysis system approach is preferable The flow chart of embodiment.Wherein, step S207, step S208, the order of step S209 can With exchange.

Step S201, profile point acquisition module 11 reads image acquisition equipment from storage device 20 The 2D image of the product 3 of 2 captures, travels through this 2D image the most in X direction with Y-direction, When obtaining different two pixels of continuous two color value every time, record one of them and have pre- If the profile point that the pixel of color value is 2D image, take turns until obtaining all of 2D image The point cloud (as shown in Fig. 4 (I)) that wide point is constituted.In the present embodiment, the pixel of this 2D image Only include two kinds of colors black, white.The pixel value of black pixel point is 0, the picture of white pixel point Element value is 255, and the pixel with pre-set color value (such as black) is the wheel on product 3 Wide point.

Step S202, contour curve processing module 12 reads setting of product 3 from storage device 20 The control point of upper each theoretical contour of meter model, according to the control of every theoretical contour Point one plane of matching.All control point of every theoretical contour are stored in a storage number Group, for controlling the shape of this theoretical contour.As shown in Fig. 4 (II), it it is the point of Fig. 4 (I) The theoretical contour that cloud is corresponding.

Step S203, contour curve processing module 12 judges the normal direction of the plane that each matching obtains Amount direction is the most consistent with the normal vector direction of X/Y plane.If the plane that all matchings obtain Normal vector direction is all consistent with the normal vector direction of X/Y plane, then perform step S206.If The normal vector direction of the plane that certain matching obtains is inconsistent with the normal vector direction of X/Y plane, Then perform step S204.

Step S204, the normal direction of the plane that contour curve processing module 12 obtains according to this matching Amount, angle between the normal vector of X/Y plane and two normal vectors are bent by corresponding theoretical profile Line rotates to X/Y plane.

For example, it is assumed that the method for the plane obtained according to the control point matching of a theoretical contour Vector is V (V.x, V.y, V.z), and the normal vector of X/Y plane is V1 (V1.x, V1.y, V1.z), then Contour curve processing module 12 calculates included angle A 1 and this two normal vectors of these two normal vectors Normal beam technique vector V2 (V2.x, V2.y, V2.z), computing formula is as follows:

$A1=a\cos \left[\frac{V.x*V1.x+V.y*V1.y+V.z*V1.z}{\sqrt{({V,x}^2+V.y^2+{V.z}^2)*({V1.x}^2+{V1.y}^2+{V1.z}^2)}}\right];$

V2.x=V.y*V1.z-V1.y*V.z；

V2.y=V.z*V1.x-V1.z*V.x；

V2.z=V.x*V1.y-V1.x*V.y；

Afterwards, unit matrix is obtained spin matrix around normal vector V2 anglec of rotation A1, then will Spin matrix is multiplied by all control point of this theoretical contour will the rotation of this theoretical contour Forward X/Y plane to.

Step S205, contour curve processing module 12 arbitrarily selects a theoretical contour, Calculate the normal direction in the normal vector direction of other theoretical contour and the theoretical contour of selection Angle between amount direction.If the angle of two normal vectors is more than 90 degree, then show these two The direction of normal vector is inconsistent, then contour curve processing module 12 is by by other theoretical profile The mode that the control point of curve storage order in storage array negates is by other theoretical profile The normal vector direction of curve negates so that the normal vector direction of all theoretical contours is consistent. As it is shown in figure 5, X/Y plane has tetra-curves of A, B, C, D, it is assumed that wherein A, B Direction of curve is clockwise, and C, D direction of curve be counter clockwise direction, then A, B curve is inconsistent with the direction of the normal vector of C, D curve, needs the arrow of A, B curve Amount direction is adjusted to counterclockwise, or the direction vector of C, D curve is adjusted to up time Pin direction so that A, B curve is consistent with the direction of the normal vector of C, D curve.XY puts down Face is reference vector V of curve A, B, C, D, first and second control point in every curve Vector be this direction of curve vector V1, the normal vector V2 of this curve equal to this curve The difference of reference vector V and direction vector V1 is taken advantage of.

Step S206, profile alignment module 13 utilizes mathematical method all of 2D image to be taken turns The point cloud that wide point is constituted aligns with theoretical contour (as shown in Figure 6).In the present embodiment, This mathematical method is Newton iterative f (X), selects a profile point when iteration starts from a cloud As original aligned position, a cloud is tentatively alignd with theoretical contour, calculate in some cloud The meansigma methods of the quadratic sum of all minimum distances, to the minimum distance of curve, is made by all profile point It is iterated for primary iteration functional value, until it is all to find an aligned position to make in invocation point cloud Profile point to the meansigma methods minimum of the quadratic sum of the minimum distance of curve i.e. show a cloud with reason Opinion contour curve arrives best alignment position.Formula is as follows:

$f\left(X\right)=\min \sqrt{\frac{\underset{i=1}{\overset{n}{\mathrm{\Σ}}}\left({\sqrt{{(X2-X1)}^2+{(Y2-Y1)}^2+{(Z2-Z1)}^2}}^2\right)}{n}}$

Wherein, n represents a quantity at cloud midpoint, and (X1, Y1, Z1) represents the profile point in some cloud, Point closest with the profile point in a cloud on (X2, Y2, Z2) representation theory contour curve.

Step S207, edge analysis module 14 puts each profile point in cloud to reason after calculating alignment The minimum distance of opinion contour curve, connects the profile point in each minimum distance corresponding point cloud and theory Point on contour curve obtains measuring line, corresponding according to the deviation range that each minimum distance is fallen into Color to measure line indicate different colours.

For example, it is assumed that deviation value that may be present is divided into several deviation ranges intervals, each The corresponding unique color in deviation range interval, the color that such as [-2.000 ,-1.675] are corresponding is Dark blue, the color of [-1.675 ,-1.350] correspondence is light blue, the color that [-0.050 ,+0.050] is corresponding For light green, the color of [+0.050,0.375] correspondence is crocus, [-2.000 ,-1.675], The color of [+1.350 ,+1.675] correspondence is orange, and the color of [+1.675 ,+2.000] correspondence is red Color.As it is shown in fig. 7, curve L1 representation theory contour curve, an if profile in some cloud The distance of some P1 (X1, Y1, Z1) and the some Q1 (X1 ', Y1 ', Z1 ') on theoretical contour L1 is Closely, this minimum distance is equal to 0.285, falls into deviation range interval [+0.050,0.375], then takes turns Wide module 14 junction point P1, Q1 of analyzing obtains measuring line S1, and indicates this measurement line S1 For crocus (color is not shown).

Step S208, edge analysis module 14 is bent according to the profile point in a cloud to theoretical profile The maximum of the minimum distance of line and minima are calculated the profile tolerance of product 3.Such as, if Profile point in some cloud is 0.80000 to the maximum of the minimum distance of theoretical contour, Little value is-0.00850, then the profile tolerance of this product 3 is 0.80000-(-0.00850)=0.80850.

Step S209, adjacent profile point is carried out even by edge analysis module 14 successively with line segment Connect, corresponding according to the margin of tolerance that the minimum distance that two profile point of connecting line segment are corresponding falls into Color determine the color of each line segment.Such as, the color of line segment could be arranged to the starting point of line segment Or the color that the margin of tolerance that falls into of minimum distance corresponding to terminal is corresponding, if the starting point of line segment with The margin of tolerance that the minimum distance that terminal is corresponding falls into is different, it is also possible to the color arranging line segment is Color transition corresponding to the margin of tolerance that fallen into by the minimum distance that starting point is corresponding is corresponding to terminal Color corresponding to the margin of tolerance that falls into of minimum distance.For example, it is assumed that have 1,2,3 ..., N profile point, connects profile point 1～2,2～3 the most respectively ..., (n-1)～n obtain line segment 1, 2 ..., n-1, the color of each line segment can take the 1st, 2,3 respectively ..., n-1 profile point The color that the margin of tolerance that corresponding minimum distance falls into is corresponding, or take the 2nd, 3 ..., n The color that the margin of tolerance that minimum distance corresponding to individual profile point falls into is corresponding.As it is shown in fig. 7, Point P1, P2 are profile point adjacent in a cloud, then connected by P1, P2 line segment.

Step S210, reporting modules 15 exports analysis result, including product 3 profile tolerance, Connect the Ditermination of cam profile that profile point obtains, and connect the profile point that each minimum distance is corresponding And all measurement lines that the point on theoretical contour obtains.User can be according to product in report District devious with theoretical value on the profile tolerance of 3, the profile of measurement line positioning product 3 intuitively Territory, and according to the color measuring each line segment in line and Ditermination of cam profile and the deviation pre-set The deviation size in each region of color understanding that scope is corresponding.

It should be noted last that, above example only in order to technical scheme to be described and Unrestricted, although the present invention being described in detail with reference to above preferred embodiment, this area It is to be appreciated by one skilled in the art that technical scheme can be modified or is equal to Replace, without deviating from the spirit and scope of technical solution of the present invention.

Claims (10)

1. product contour image analyzes a method, is applied to calculate device, it is characterised in that The method includes:

Profile point acquisition step: receive the bidimensional image of the product of image acquisition equipment capture, point Travel through this bidimensional image the most in X direction with Y-direction, obtain continuous two color value not every time With two pixels time, record one of them pixel with pre-set color value for two dimension shadow The profile point of picture, obtains the some cloud that all profile point of bidimensional image are constituted；

Contour curve processes step: read the design mould of product from the storage device of this calculating device All theoretical contours are processed by all theoretical contours of type so that institute is reasonable The normal vector direction that opinion contour curve is all located at X/Y plane and all theoretical contours is consistent；

Profile alignment step: the some cloud that all profile point of bidimensional image are constituted and theoretical profile Curve aligns；And

Edge analysis step one: according to the low coverage of the profile point in a cloud to theoretical contour From maximum and minima be calculated the profile tolerance of product.

2. product contour image as claimed in claim 1 analyzes method, it is characterised in that should Method also includes:

Edge analysis step 2: put each profile point in cloud after calculating alignment to theoretical contour Minimum distance, connect each minimum distance corresponding some cloud in profile point and theoretical contour On point obtain measuring line, the color pair that the deviation range that fallen into according to each minimum distance is corresponding Measure line and indicate different colours.

3. product contour image as claimed in claim 2 analyzes method, it is characterised in that should Method also includes edge analysis step 3: profile point adjacent in a cloud carried out with line segment successively Connect, the margin of tolerance pair fallen into according to the minimum distance that two profile point of connecting line segment are corresponding The color answered determines the color of each line segment.

4. product contour image as claimed in claim 3 analyzes method, it is characterised in that should Method also includes reporting step: export analysis result, including profile tolerance, the connection profile of product The Ditermination of cam profile that point obtains, and connect profile point corresponding to each minimum distance and theoretical wheel All measurement lines that point on wide curve obtains.

5. product contour image as claimed in claim 1 analyzes method, it is characterised in that institute State contour curve process step to include:

One plane of control point matching according to every theoretical contour, every theoretical profile song All control point of line are stored in a storage array；

If the normal vector of the plane that certain matching obtains differs with the normal vector direction of X/Y plane Cause, then the normal vector of the plane obtained according to this matching, the normal vector of X/Y plane and two methods Corresponding theoretical contour is rotated to X/Y plane by the angle between vector；And

Arbitrarily select a theoretical contour, calculate the normal vector side of other theoretical contour Angle between the normal vector direction of the theoretical contour selected, if two normal vectors Angle is more than 90 degree, then by the control point of other theoretical contour depositing in storage array Storage order negates so that the normal vector direction of all theoretical contours is consistent.

6. a product contour image analyzes system, it is characterised in that this system includes:

Profile point acquisition module, for receiving the two-dimentional shadow of the product of image acquisition equipment capture Picture, travels through this bidimensional image the most in X direction with Y-direction, obtains continuous two face every time During different two pixels of colour, recording one of them pixel with pre-set color value is The profile point of bidimensional image, obtains the some cloud that all profile point of bidimensional image are constituted；

Contour curve processing module, for from storage device read product design a model all All theoretical contours are processed by theoretical contour so that all theoretical profiles are bent The normal vector direction that line is all located at X/Y plane and all theoretical contours is consistent；

Profile alignment module, for the some cloud and the theory that all profile point of bidimensional image are constituted Contour curve aligns；And

Edge analysis module, for according to nearest to theoretical contour of the profile point in a cloud The maximum of distance and minima are calculated the profile tolerance of product.

7. product contour image as claimed in claim 6 analyzes system, it is characterised in that institute State edge analysis module, put each profile point in cloud after being additionally operable to calculate alignment bent to theoretical profile The minimum distance of line, connects the profile point in the some cloud that each minimum distance is corresponding and theoretical profile is bent Point on line obtains measuring line, the color that the deviation range that fallen into according to each minimum distance is corresponding Different colours is indicated to measuring line.

8. product contour image as claimed in claim 7 analyzes system, it is characterised in that institute State edge analysis module, be additionally operable to carry out even profile point adjacent in a cloud successively with line segment Connect, corresponding according to the margin of tolerance that the minimum distance that two profile point of connecting line segment are corresponding falls into Color determine the color of each line segment.

9. product contour image as claimed in claim 7 analyzes system, it is characterised in that should System also includes reporting modules, is used for exporting analysis result, including profile tolerance, the connection of product The Ditermination of cam profile that profile point obtains, and connect profile point corresponding to each minimum distance and reason All measurement lines that point on opinion contour curve obtains.

10. product contour image as claimed in claim 6 analyzes system, it is characterised in that Contour curve processing module carries out process to all theoretical contours and includes:

One plane of control point matching according to every theoretical contour, every theoretical profile song All control point of line are stored in a storage array；

If the normal vector of the plane that certain matching obtains differs with the normal vector direction of X/Y plane Cause, then the normal vector of the plane obtained according to this matching, the normal vector of X/Y plane and two methods Corresponding theoretical contour is rotated to X/Y plane by the angle between vector；And

Arbitrarily select a theoretical contour, calculate the normal vector side of other theoretical contour Angle between the normal vector direction of the theoretical contour selected, if two normal vectors Angle is more than 90 degree, then by the control point of other theoretical contour depositing in storage array Storage order negates so that the normal vector direction of all theoretical contours is consistent.