3D Fixed-Point Printing Calibration for Accurate Target Positioning
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Traditional printers face challenges in accurately positioning prints in the world coordinate system due to discrepancies between the printer's operating range and printing target coordinate systems, leading to positioning errors and failures, especially critical in nail decorating scenarios where high precision is required.
Innovation Solution
A three-dimensional high-precision fixed-point printing method utilizing a computer vision system and 3D camera to calibrate and unify the coordinate systems, involving the installation of special mark points and a 3D camera to convert 3D point clouds into the printer's coordinate system, enabling accurate printing on the printing target.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional printing systems use the printer's operating range coordinate system for positioning, then the printer can achieve high-precision repeated positioning within its own coordinate system, but positioning errors occur in the world coordinate system due to mechanical wear, aging, and fouling of positioning devices
Solution Approach 1:
The patent introduces a calibration pattern and coordinate transformation mechanism as an intermediary between the printer's operating range coordinate system and the world coordinate system. The calibration pattern printed on the target object serves as a mediator that enables the system to calculate transformation matrices, allowing accurate positioning in the world coordinate system without being affected by mechanical wear or positioning device fouling.
Solution Approach 2:
The patent dynamically changes the coordinate system parameters by calculating transformation matrices based on the calibration pattern. Instead of relying on fixed mechanical positioning parameters that degrade over time, the system updates the coordinate transformation parameters (transformation matrices) for each printing task, compensating for mechanical wear and maintaining accurate world coordinate system positioning.
2Ease of operation
If the coordinate system of the printing target is assumed to be consistent with the printer's operating range coordinate system, then the system setup is simple, but positioning accuracy is very low and depends on the coincidence of the two coordinate systems when placing the printing target
Solution Approach 1:
The patent performs preliminary action by printing a calibration pattern on the target object before actual printing. This calibration pattern contains encoded coordinate information that enables the system to pre-calculate the transformation matrix between the printer's coordinate system and the world coordinate system, ensuring high positioning accuracy without complex manual setup procedures.
Solution Approach 2:
The patent uses the calibration pattern as a copy or reference that encodes the coordinate system relationship. By printing this known pattern and detecting its position, the system creates a digital copy of the coordinate transformation information, which is then used to accurately map positions between coordinate systems without requiring physical measurement or complex alignment procedures.
3Manufacturing precision
If auxiliary positioning marks are used to place paper in traditional printing systems, then some positioning accuracy can be achieved, but the accuracy is very low and depends on manual placement coincidence
Solution Approach 1:
The patent implements self-service by enabling the system to automatically determine its own coordinate transformation parameters through the calibration pattern. Instead of requiring manual placement and measurement of positioning marks, the system autonomously prints the calibration pattern, detects its position through image processing, calculates the transformation matrix, and uses it for accurate positioning, eliminating manual intervention entirely.
Solution Approach 2:
The patent replaces the mechanical manual positioning system with an optical and computational system. Instead of relying on manual placement of auxiliary marks and mechanical alignment, the system uses optical detection (imaging the calibration pattern) and computational processing (calculating transformation matrices) to achieve high-precision positioning, substituting mechanical operations with optical-mechanical-computational integration.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The invention discloses a three-dimensional high-precision fixed-point printing method and device, wherein a printer prints a designated calibration pattern to a printing platform; Take pictures with 3D camera to obtain two-dimensional pictures and 3D point clouds; Calibrating the camera and the printer, and obtaining the transformation matrix of the printer coordinate system and the camera coordinate system; According to the external parameters, the point cloud in the camera coordinate system can be converted to the printer coordinate system according to the external parameters, and the printing mechanism in the printing device can print through the coordinate parameters provided by the computer vision mechanism, and can convert the 3D coordinates to the printer coordinate system according to the printing requirements of the user, so as to accurately print to the target position, and can flexibly print the pattern on the object to be printed according to the actual position of the object to be printed without manual measurement and adjustment, greatly improving the speed and accuracy, and when the printer has a positioning fault, the machine can be discovered by automatic detection, so as to prevent losses caused by the machine operating in a faulty state.