CN104422874A - PCB test method for converting wires into discs - Google Patents

Abstract

The invention discloses a PCB test method for converting wires into discs, and relates to the field of a PCB test technology. According to the method, through scanning the PCB, frame discrete spots between images are obtained, a minimum convex closure and the minimum external connection rectangular of the minimum convex closure are calculated, then comparisons with original images are made successively by use of a rectangle, a fillet rectangular and a circle in terms of pixel overlapping area, and the image with the highest overlapping area proportion is taken as an optical shape. The method provided by the invention, compared to a conventional method, calculates the optical shape according to an area comparison method, such that the trouble of manually adjusting the shape is avoided. During searching of a similar wire for intelligent transformation, the speed and the accuracy can be improved by using the method.

Description

A kind of line of pcb board test converts the method for dish to

[technical field]

The present invention relates to pcb board technical field of measurement and test, the line particularly relating to the test of a kind of pcb board converts the method for dish to.

[background technology]

On one piece of pcb board, pcb board surface upper and lower surface is called top layer and bottom, and middle internal layer is commonly referred to middle layer.In the copper sheet part that top layer or bottom are covered by green oil, or the copper in middle layer, be referred to as line in pcb board field; Top layer or bottom, not by the copper sheet part that green oil covers, are referred to as dish, and dish is the position of components and parts position and boring.

When designing the figure of pcb board, the designer of pcb board carrys out indicating panel in the structure of the position line in components and parts or hole sometimes, before pcb board is tested, the line at these these positions is then needed to change into dish, in addition, there is the dish of some non-standard shapes also to need to carry out the operation that line converts dish to, make the shape normalised of dish, thus make test more smooth.Change into dish and be generally divided into two steps carrying out line to pcb board in prior art: the first step is carried out line to the figure that original needs are changed and converted dish to; Second step carries out smart wire changeover panel according to the height shape of the first step to the position of line similar on pcb board.This method migration shape is out mostly more fixing, sometimes also needs manually to adjust shape, and the speed of second step is slowed down, and whole structure is not good.

[summary of the invention]

The object of the invention is to the deficiency effectively overcoming above-mentioned technology, the line providing a kind of pcb board to test converts the method for dish to, and the method well solves the problem of change of shape, without the need to manually adjusting the shape of line changeover panel.

Technical scheme of the present invention is achieved in that and includes following step:

A, pcb board to be scanned, obtained the frame of the figure that will change by scanning element, and be labeled as image a, after this pixel of progressive scanning picture a, get the Far Left point and rightmost point of often going, obtain the frame point of image a;

B, according to the frame discrete point obtained in steps A, calculate the Minimum Convex Closure of image a frame point, this convex closure is the minimum convex polygon comprising All Border discrete point;

C, by the Minimum Convex Closure obtained in step B, and have the principle parallel with the limit of convex closure at least according to the minimum enclosed rectangle of convex closure, calculate minimum enclosed rectangle;

The minimum enclosed rectangle obtained drawn in D, foundation step C, carries out pixel overlapping area with rectangle, round rectangle and circle and former figure successively and compares, get the highest figure of overlapping area ratio as optimum shape.

Following steps are included in described step C:

A limit of C1, selected convex closure, using the limit of this limit as rectangle, and makes minimum enclosed rectangle;

The positional information of C2, record rectangle and size, calculate the area of this rectangle, be recorded as S1;

C2, the counterclockwise minimum enclosed rectangle calculating correspondence successively along all the other each limits, record its area and be followed successively by S2, S3 ... Sn;

C4, get area minimum in S1-Sn, the boundary rectangle of its correspondence is exactly required convex closure minimum enclosed rectangle.

Following steps are included in described step D:

D1, represent former figure by redness, then represent minimum enclosed rectangle by green;

D2, former figure and minimum enclosed rectangle lap green represent, and record the ratio of lap, when ratio reaches more than 0.95, then choose this figure as optimum figure, otherwise continue step below;

D3, continue with round rectangle, circular repeat step D1 and D2, if all figures record lap ratio all do not reach 0.95, then choose the highest figure of lap ratio as optimum figure.

Beneficial effect of the present invention is: the present invention compares with existing method, optimum shape is calculated according to Area comparison method, eliminate the trouble of manually adjustment shape, when finding class liny and carrying out intelligent height, speed and accuracy can be improved by method of the present invention.

[accompanying drawing explanation]

Fig. 1 is schematic flow sheet of the present invention;

Fig. 2, Fig. 3 are specific embodiments of the invention figure.

[embodiment]

We carry out more specifically bright by reference to the accompanying drawings to the present invention below.

With reference to Fig. 1, the line that the invention discloses the test of a kind of pcb board converts the method for dish to, the method is used for pcb board designer when the graphic designs of PCB, the operation that line converts dish to is carried out in the position carrying out indicating panel in the structure of the position line in components and parts or hole, and the method specifically mainly includes following step:

A, pcb board to be scanned, obtained the frame of the figure that will change by scanning element, and be labeled as image a, after this pixel of progressive scanning picture a, get the Far Left point and rightmost point of often going, obtain the frame point of image a;

B, according to the frame discrete point obtained in steps A, calculate the Minimum Convex Closure of image a frame point, this convex closure is the minimum convex polygon comprising All Border discrete point; With reference to shown in Fig. 2, be a specific embodiment of the present invention, wherein, figure 10 is the Minimum Convex Closure of image a;

C, by the Minimum Convex Closure obtained in step B, and have the principle parallel with the limit of convex closure at least according to the minimum enclosed rectangle of convex closure, calculate minimum enclosed rectangle, concrete, step C includes step C1-C4:

A limit of C1, selected convex closure, using the limit of this limit as rectangle, and makes minimum enclosed rectangle;

The positional information of C2, record rectangle and size, calculate the area of this rectangle, be recorded as S1;

C2, the counterclockwise minimum enclosed rectangle calculating correspondence successively along all the other each limits, record its area and be followed successively by S2, S3 ... Sn;

C4, get area minimum in S1-Sn, the boundary rectangle of its correspondence is exactly required convex closure minimum enclosed rectangle.

With reference to shown in Fig. 2, Fig. 3, be a specific embodiment of the present invention, wherein during the limit of a limit 101 of selected convex closure 10 as rectangle, its minimum enclosed rectangle is as shown in figure in Fig. 2 20, and the area of this figure 20 is recorded as S1; With reference to Fig. 3, when a limit as rectangle, another limit 102 of selected convex closure 10, its minimum enclosed rectangle is as shown in figure in Fig. 3 30, the area of this figure 30 is recorded as S2, after this, once choose limit 103, limit 104 and limit 105 limit as rectangle, calculate the area of its minimum enclosed rectangle respectively, be recorded as S3, S4, S5, get area minimum in S1-S5, it is then convex closure 10 minimum enclosed rectangle to the boundary rectangle of yacht, and such as, when S1 is minimum, then figure 20 is the minimum enclosed rectangle of convex closure 10.

The minimum enclosed rectangle obtained drawn in D, foundation step C, carries out pixel overlapping area with rectangle, round rectangle and circle and former figure successively and compares, get the highest figure of overlapping area ratio as optimum shape; Concrete, step D includes step D1-D4:

D1, represent former figure by redness, then represent minimum enclosed rectangle by green;

D2, former figure and minimum enclosed rectangle lap green represent, and record the ratio of lap, when ratio reaches more than 0.95, then choose this figure as optimum figure, otherwise continue step below;

D3, continue with round rectangle, circular repeat step D1 and D2, if all figures record lap ratio all do not reach 0.95, then choose the highest figure of lap ratio as optimum figure.

After optimum figure is selected, be the present invention carry out line changeover panel after figure, and, when the shape non-standard shapes of coiling, also become standard shape by above-mentioned method migration.The present invention's this kind of conversion method, compares with existing method, calculates optimum shape according to Area comparison method, eliminates the trouble of manually adjustment shape, when finding class liny and carrying out intelligent height, can improve speed and accuracy by method of the present invention.

Described above is only preferred embodiment of the present invention, and above-mentioned specific embodiment is not limitation of the present invention.In technological thought category of the present invention, can occur various distortion and amendment, all those of ordinary skill in the art, according to describing retouching, the amendment made above or equivalent replacing, all belong to the scope that the present invention protects.

Claims (3)

1. the line of pcb board test converts a method for dish to, it is characterized in that: include following step:

A, pcb board to be scanned, obtained the frame of the figure that will change by scanning element, and be labeled as image a, after this pixel of progressive scanning picture a, get the Far Left point and rightmost point of often going, obtain the frame point of image a;

B, according to the frame discrete point obtained in steps A, calculate the Minimum Convex Closure of image a frame point, this convex closure is the minimum convex polygon comprising All Border discrete point;

C, by the Minimum Convex Closure obtained in step B, and have the principle parallel with the limit of convex closure at least according to the minimum enclosed rectangle of convex closure, calculate minimum enclosed rectangle;

The minimum enclosed rectangle obtained drawn in D, foundation step C, carries out pixel overlapping area with rectangle, round rectangle and circle and former figure successively and compares, get the highest figure of overlapping area ratio as optimum shape.

2. the line of a kind of pcb board test according to claim 1 converts the method for dish to, it is characterized in that: include following steps in described step C:

A limit of C1, selected convex closure, using the limit of this limit as rectangle, and makes minimum enclosed rectangle;

The positional information of C2, record rectangle and size, calculate the area of this rectangle, be recorded as S1;

C3, the counterclockwise minimum enclosed rectangle calculating correspondence successively along all the other each limits, record its area and be followed successively by S2, S3 ... Sn;

C4, get area minimum in S1-Sn, the boundary rectangle of its correspondence is exactly required convex closure minimum enclosed rectangle.

3. the line of a kind of pcb board test according to claim 1 converts the method for dish to, it is characterized in that: include following steps in described step D:

D1, represent former figure by redness, then represent minimum enclosed rectangle by green;

D2, former figure and minimum enclosed rectangle lap green represent, and record the ratio of lap, when ratio reaches more than 0.95, then choose this figure as optimum figure, otherwise continue step below;

D3, continue with round rectangle, circular repeat step D1 and D2, if all figures record lap ratio all do not reach 0.95, then choose the highest figure of lap ratio as optimum figure.