CN101776882B - Method for generating laser cutting program - Google Patents

Abstract

The present invention provides a method for generating a laser cutting processing program, comprising step 1, using a camera to obtain digital image data of an object to be processed, and performing image preprocessing on the digital image; step 2, manually specifying a detection guide line in the preprocessed digital image, and a computer extracting the coordinate data of image boundary points near the detection guide line under the guidance of the detection guide line, and organizing these coordinate data into a coordinate data linked list; step 3, using straight lines, circular arcs, and parameter curves to segmentally fit the coordinate data to form an image data linked list; step 4, using a third-order Hermite parameter curve to smoothly connect adjacent image elements, and filling the connected image elements into the image data linked list; step 5, post-processing the image data linked list into a motion instruction of a laser cutting machine, and handing it over to the laser cutting machine controller for decoding and execution. The present invention uses machine vision and digital image processing technology, human-computer interaction, to generate a high-quality laser cutting processing program.

Description

Generation method of laser cutting processing program

technical field

The invention relates to the field of laser cutting machine processing and programming, in particular to a method for generating a laser cutting processing program.

Background technique

At present, my country's laser processing industry is a new industry. In the past, the processing of the graphics required for laser cutting was performed by manually compiling machine codes. This manual operation is cumbersome and the work efficiency is low. With the advantages of modern computer development, the microcomputer control technology of machine tool laser cutting has also been paid more and more attention by people. Using microcomputer control technology, it is necessary not only to create a good interface environment for man-machine interface, simplify the operation, but also to fabricate processing software suitable for the graphics required by the microcomputer control of machine tool laser cutting, so as to achieve automatic conversion into machine code programs.

The programming method of the laser cutting processing program in the prior art generally uses image vector processing software such as CoreDraw to extract the peripheral contour of the image, generate a contour vector diagram, and hand it over to the programming post-processing software of the laser cutting machine to process it into a motion control command for the laser head. , the laser cutting machine executes the control command and cuts out the corresponding image shape. The defect of this method is that when the outline of the image is unclear and the boundary is not clear, the existing method can only draw the outline manually, and cannot extract the coordinate points from the outline of the image.

Contents of the invention

The object of the present invention is to provide a method for generating a laser cutting program, which uses machine vision and digital image processing technology, human-computer interaction, and generates a high-quality laser cutting program.

In order to achieve the above object, the present invention provides a method for generating a laser cutting program, which includes:

Step 1, using a camera to obtain digital image data of the object to be processed, and performing image preprocessing on the digital image;

Step 2. Manually designate the detection guide line in the preprocessed digital image, and the computer extracts the image boundary point coordinate data near the detection guide line under the guidance of the detection guide line, and organizes these coordinate data into a coordinate data linked list;

Step 3, using straight lines, arcs, and parameter curves to segmentally fit the coordinate data to form a graphic element data linked list;

Step 4, using the third-order Hermite parameter curve to smoothly connect adjacent primitives, and filling the connected primitives into the primitive data linked list;

Step 5, post-processing the linked list of graphic element data into motion instructions of the laser cutting machine, handing it over to the controller of the laser cutting machine for decoding and then executing.

The image preprocessing includes image filtering or image enhancement.

The image filtering includes threshold filtering, and different digital images adopt different filtering methods.

In said step 2, the detection guide line is manually drawn near the preprocessed digital image contour, and the computer generates equally spaced detection lines on the detection guide line, and the interval distance is preset by the system; on the detection line, according to the system The preset value generates equidistant detection points, and the pixel difference of the detection points is calculated along the detection line, and the peak value of the difference can be determined as the boundary; then the point coordinate data on the boundary is organized into a coordinate data linked list according to the numerical control linked list for storage.

In the step 4, the third-order Hermite interpolation is used to construct a smooth transition curve at the interval between adjacent graphic elements.

Beneficial effects of the present invention: The method for generating laser cutting processing programs provided by the present invention uses machine vision and digital image processing technology, human-computer interaction, and generates high-quality laser cutting processing programs, which can effectively solve the problem when the image outline is not clear Or when the boundary is not clear, the artificial outline is used intelligently, and the coordinate points cannot be extracted from the image outline, which greatly simplifies the operation process and improves production efficiency.

In order to further understand the features and technical content of the present invention, please refer to the following detailed description and accompanying drawings of the present invention. However, the accompanying drawings are provided for reference and illustration only, and are not intended to limit the present invention.

Description of drawings

The technical solutions and other beneficial effects of the present invention will be apparent through the detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings.

In the attached picture,

Fig. 1 is a schematic flow chart of the generation method of the laser cutting program of the present invention;

Fig. 2 is the original digital image of an embodiment of the object to be processed in the present invention;

Fig. 3 is the image after threshold filtering in Fig. 2;

Fig. 4 is a schematic diagram of boundary point extraction in Fig. 3;

Fig. 5 is the schematic diagram of segmented straight line, circular arc and parameter curve fitting in Fig. 4;

Fig. 6 is the partial schematic diagram that adopts third-order Hermite parameter curve smooth connection to Fig. 5;

Fig. 7 is a motion trajectory diagram of the object to be processed in the present invention after it is generated;

FIG. 8 is a schematic diagram of the movement trajectory after the image information in FIG. 7 is hidden.

Detailed ways

In order to further illustrate the technical means adopted by the present invention and its decorative effect, the following is a detailed description in conjunction with preferred embodiments of the present invention and accompanying drawings.

As shown in FIG. 1 , the present invention provides a method for generating a laser cutting processing program, which includes: Step 1. Using a camera to acquire digital image data of an object to be processed, and performing image preprocessing on the digital image. The image preprocessing includes image filtering, image enhancement and other processing, wherein the image filtering includes threshold filtering, and different filtering methods can be used for different digital images to make the image easier to process. As shown in FIG. 2, it is the original digital image of an embodiment of the object to be processed in the present invention, and FIG. 3 is the digital image after threshold filtering in step 1.

Step 2. Manually designate the detection guide line in the preprocessed digital image, and the computer extracts the image boundary point coordinate data near the detection guide line under the guidance of the detection guide line, and organizes these coordinate data into a coordinate data linked list. As shown in Figure 4, the detection guide line is manually drawn near the preprocessed digital image contour, and the computer generates equidistant detection lines on the detection guide line, and the interval distance is preset by the system. On the detection line, an equidistant detection point is generated according to the value preset by the system, and the corresponding 3X3 pixels on the detection point are projected to the detection point by the rectangular interpolation method, and the pixel difference of the detection point is calculated along the detection line, and at the peak of the difference can be judged as borderline. Finally, the point coordinate data on the boundary is organized into a coordinate data linked list according to the numerical control linked list for storage.

Step 3, using straight lines, arcs, and parametric curves to fit the coordinate data segmentally to form a graphic element data linked list. As shown in Figure 5, the coordinates of the boundary points extracted on the boundary contour are segmented into straight line segments, circular arcs, and parametric curves.

Step 4, using the third-order Hermite parametric curve to smoothly connect adjacent primitives, and filling the connected primitives into the primitive data linked list. As shown in Figure 6, it is a partial schematic diagram of a smooth transition curve constructed at the interval between adjacent primitives using third-order Hermite interpolation, and Figure 7 is a motion trajectory diagram generated by using this smooth transition to withdraw money.

Step 5, post-processing the linked list of graphic element data into motion instructions of the laser cutting machine, handing it over to the controller of the laser cutting machine for decoding and then executing. After the motion trajectory diagram generated in Figure 7 is post-processed to hide the image information, the motion trajectory diagram shown in Figure 8 can be processed into the motion command of the laser cutting machine, which can be delivered to the laser cutting machine. Controller decoding.

In summary, the method for generating laser cutting processing programs provided by the present invention uses machine vision and digital image processing technology, human-computer interaction, and generates high-quality laser cutting processing programs, which can effectively solve the problem when the image outline is unclear or When the boundary is not clear, the artificial outline is used intelligently, and the coordinate points cannot be extracted from the image outline, which greatly simplifies the operation process and improves production efficiency.

As mentioned above, for those of ordinary skill in the art, other various corresponding changes and modifications can be made according to the technical scheme and technical concept of the present invention, and all these changes and modifications should belong to the appended claims of the present invention scope of protection.

Claims (5)

1. the generation method of a laser cutting program is characterized in that, comprising:

Step 1, employing camera obtain the DID of object to be processed, and this digital picture is carried out the image pre-service;

Step 2, the artificial appointment detected guide line in pretreated digital picture, near the image boundary point coordinate data of the computing machine detection guide line is extracted in the guiding that detects guide line down, and these coordinate datas are organized into the coordinate data chained list;

Step 3, adopt straight line, circular arc, and parametric line piecewise fitting coordinate data, form the primitive data chained list;

Step 4, adopt the smooth connection adjacent graphical elements of three rank Hermite parametric lines, and should connect pel and be filled in the primitive data chained list;

Step 5, this primitive data chained list aftertreatment is become the movement instruction of laser cutting machine, hand over cut machine controller decoding back to carry out.

2. the generation method of laser cutting program as claimed in claim 1 is characterized in that, said image pre-service comprises image filtering or figure image intensifying.

3. the generation method of laser cutting program as claimed in claim 2 is characterized in that, said image filtering comprises threshold values filtering, and different digital pictures adopts the different filtering method.

4. the generation method of laser cutting program as claimed in claim 1; It is characterized in that; In the said step 2; The artificial drafting detected guide line near pretreated digital picture profile, and computing machine is detecting the equally spaced detection line of generation on the guide line, and this spacing distance is preestablished by system; On detection line, generate equidistant check point by the predefined value of system, ask the pixel difference of check point along detection line, decidable is the border at difference peak value place; Then borderline point coordinate data being organized into the coordinate data chained list by the numerical control chained list stores and management.

5. the generation method of laser cutting program as claimed in claim 1 is characterized in that, in the said step 4, with the curve of three rank Hermite interpolation in the interval of adjacent graphical elements structure smooth transition.