A Visual Positioning Method for Laser Cutting Based on Arbitrary Template Matching
A template matching and visual positioning technology, which is applied in character and pattern recognition, image analysis, instruments, etc., can solve the problems of cumbersome process, high precision of fixtures and jaws, and long time consumption, so as to improve cutting accuracy and simplify positioning The process and time, the effect of improving accuracy
Active Publication Date: 2021-02-12
上海柏楚电子科技股份有限公司
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Problems solved by technology
However, such a mechanical positioning method requires re-adjusting the fixture or claws for each specification of the plate to achieve the purpose of paralleling the long and short sides of the rectangular plate to the XY axis. The process is cumbersome and time-consuming, and the accuracy of the fixture and claw It is very high; secondly, when determining the starting point of processing, it is necessary to repeatedly fine-tune and repeatedly test the cutting effect. Only within 30 wires
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Embodiment 1
[0091] 1. Install the instrument according to steps S1~S5 and measure the actual mechanical length PX and PY corresponding to a single pixel in the XY direction;
[0092] 2. Capture the template image (such as Figure 10 shown) and save to the computer;
[0093] 3. Offline stage:
[0094] (1) Read the template image such as Figure 10 shown;
[0095] (2) Rotate at a certain angle to obtain the rotated template diagram, such as Figure 11 shown;
[0096] (3) Calculate the gradient direction map according to S14, such as Figure 12 shown;
[0097] (4) Establish template gradient direction table T(θ) according to above-mentioned angle;
[0098] 4. Online stage:
[0099] (1) Move the camera above a certain mark point;
[0100] (2) Collect images to be recognized from the camera, such as Figure 13 Shown:
[0101] (3) According to the formula described in S23, perform template matching on T(θ) and G1 in turn, and find the largest R(x,y,θ), which is the center position of...
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The invention relates to the technical field of laser cutting, in particular to a visual positioning method for laser cutting based on arbitrary template matching. A visual positioning method for laser cutting based on arbitrary template matching, including a beam, a cutting head, and a camera. The top of the cutting head is connected to the beam, and the side of the cutting head is connected to the camera. Compared with the existing technology, a laser cutting visual positioning method based on arbitrary template matching is provided to further improve the cutting accuracy. The camera is used to obtain the image information of the mark pattern on the plate, and by processing the image information, the pre-prepared Template matching is performed between the template image and the extracted image information to find out the pixel coordinates of the center of the mark point in the image information, and then calculate the mechanical coordinates of the actual mark point center through the center pixel coordinates.
Description
technical field [0001] The invention relates to the technical field of laser cutting, in particular to a visual positioning method for laser cutting based on arbitrary template matching. Background technique [0002] At present, in the field of laser processing technology, before laser processing, mechanical positioning is required. The specific process is to fix the plate with fixtures or claws, so that the long and short sides of the rectangular plate are parallel to the XY axes of the mechanical coordinate system (such as Figure 5 shown), and then align the cutting head with a certain mark point on the plate, and use the mechanical coordinates of this position as the starting coordinates of processing, and then according to the cutting effect, continuously fine-tune the coordinates of the starting point until the cutting accuracy is stable, and complete the mechanical positioning. However, such a mechanical positioning method requires re-adjusting the fixture or claws for...
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IPC IPC(8): G06K9/62G06T7/70
CPCG06T7/70G06F18/22
Inventor 万章殷鄂湘徐超
Owner 上海柏楚电子科技股份有限公司