Image measuring instrument technology and its development trend
Source：Longtian
Time：2019-11-28 03:11:16
Clicks：986
Image measuring instrument technology, as a type of visual inspection technology that needs to achieve quantitative measurement, measurement accuracy has always been an important indicator pursued by the technology. The image measuring instrument system usually uses CCD (ChargeCoupledDevice) and other image sensor devices to obtain image information, convert it into digital signals and collect them into a computer, and then use image processing technology to process the digital image signals to obtain various image information needed. Finally, the calibration technique is used to convert the image size information in the image coordinate system to the actual size information in the world coordinate system, so as to realize the calculation of the size and shape error.
In recent years, due to the rapid development of industrial production capacity and the improvement of processing technology, a large number of two extreme size products have emerged, namely super large size and small size. Such as the measurement of the external dimensions of aircraft, the measurement of key components of large machinery, the measurement of the external dimensions of EMUs, and the measurement of key dimensions of micro parts that are widely used in the trend of miniaturization of various equipment, and the measurement of key small dimensions in microelectronics and biotechnology Waiting for the test technology has brought new tasks. Image measuring instrument technology has a wider measurement range. Whether it is larger or smaller, it is quite difficult to use traditional mechanical measurement, and image measuring instrument technology can perform a certain proportion of the measured object according to the accuracy requirements. Zoom in or out to complete some measurement tasks that cannot be done by mechanical measurements. Therefore, whether it is a super large size measurement or a small size measurement, the important role of the image measuring instrument technology is obvious.
Generally, we call the parts with the size range of 0.1mm ~ 10mm as micro parts, which is defined as the Meso standard parts in the world. The accuracy requirements of this type of parts are relatively high, generally in the order of micrometers, and the structure is complex. Traditional detection methods have been difficult to meet the measurement requirements. The image measuring instrument system has become a commonly used method in the measurement of miniature parts. First of all, we must image the measured part (or the key feature of the measured part) on the matching image sensor device through an optical lens with sufficient magnification. Obtain the image that meets the requirements and contains the information of the target to be measured, and the image acquisition card will collect the image into the computer. Finally, the computer will perform image processing and calculation to obtain the measurement result. The image measuring instrument technology in the field of micro parts mainly has the following development trends:
1. The measurement accuracy is further improved. With the continuous advancement of the industrial level, the precision requirements for micro parts will be further improved, so it also puts forward higher requirements for the measurement accuracy of image measuring instrument technology. At the same time, with the rapid development of image sensor devices, high-resolution devices have also created conditions for the improvement of system accuracy. In addition, further research on sub-pixel technology and super-resolution technology will also provide technical guarantee for the improvement of system accuracy.
2. Improve measurement efficiency. The application of micro parts in the industry is growing geometrically. The heavy measurement tasks and the production mode of 100% online measurement require highly efficient measurement methods. With the improvement of hardware capabilities such as computers and the continuous optimization of image processing algorithms, the efficiency of image measuring instrument systems will increase.
3. Realize the transition of micro parts from point measurement mode to overall measurement mode. Existing image measuring instrument technology is constrained by the measurement accuracy. Basically, it is to image the key feature areas in the micro parts, so as to achieve the measurement of key feature points, and it is difficult to measure the entire contour or the entire feature point.
With the improvement of measurement accuracy, acquiring complete images of parts and achieving high-precision measurement of overall shape errors will be applied in more and more fields.
In short, in the field of micro-parts measurement, image measuring instrument technology to achieve high precision and high efficiency will inevitably become an important development direction of precision measurement technology. Therefore, higher requirements are put on the hardware system of image acquisition, the quality of the acquired image, the positioning of the image edge, and the system calibration. It has wide application prospects and important research significance. Therefore, this technology has become a research hotspot at home and abroad and one of the most important applications in visual inspection technology.
In recent years, due to the rapid development of industrial production capacity and the improvement of processing technology, a large number of two extreme size products have emerged, namely super large size and small size. Such as the measurement of the external dimensions of aircraft, the measurement of key components of large machinery, the measurement of the external dimensions of EMUs, and the measurement of key dimensions of micro parts that are widely used in the trend of miniaturization of various equipment, and the measurement of key small dimensions in microelectronics and biotechnology Waiting for the test technology has brought new tasks. Image measuring instrument technology has a wider measurement range. Whether it is larger or smaller, it is quite difficult to use traditional mechanical measurement, and image measuring instrument technology can perform a certain proportion of the measured object according to the accuracy requirements. Zoom in or out to complete some measurement tasks that cannot be done by mechanical measurements. Therefore, whether it is a super large size measurement or a small size measurement, the important role of the image measuring instrument technology is obvious.
Generally, we call the parts with the size range of 0.1mm ~ 10mm as micro parts, which is defined as the Meso standard parts in the world. The accuracy requirements of this type of parts are relatively high, generally in the order of micrometers, and the structure is complex. Traditional detection methods have been difficult to meet the measurement requirements. The image measuring instrument system has become a commonly used method in the measurement of miniature parts. First of all, we must image the measured part (or the key feature of the measured part) on the matching image sensor device through an optical lens with sufficient magnification. Obtain the image that meets the requirements and contains the information of the target to be measured, and the image acquisition card will collect the image into the computer. Finally, the computer will perform image processing and calculation to obtain the measurement result. The image measuring instrument technology in the field of micro parts mainly has the following development trends:
1. The measurement accuracy is further improved. With the continuous advancement of the industrial level, the precision requirements for micro parts will be further improved, so it also puts forward higher requirements for the measurement accuracy of image measuring instrument technology. At the same time, with the rapid development of image sensor devices, high-resolution devices have also created conditions for the improvement of system accuracy. In addition, further research on sub-pixel technology and super-resolution technology will also provide technical guarantee for the improvement of system accuracy.
2. Improve measurement efficiency. The application of micro parts in the industry is growing geometrically. The heavy measurement tasks and the production mode of 100% online measurement require highly efficient measurement methods. With the improvement of hardware capabilities such as computers and the continuous optimization of image processing algorithms, the efficiency of image measuring instrument systems will increase.
3. Realize the transition of micro parts from point measurement mode to overall measurement mode. Existing image measuring instrument technology is constrained by the measurement accuracy. Basically, it is to image the key feature areas in the micro parts, so as to achieve the measurement of key feature points, and it is difficult to measure the entire contour or the entire feature point.
With the improvement of measurement accuracy, acquiring complete images of parts and achieving high-precision measurement of overall shape errors will be applied in more and more fields.
In short, in the field of micro-parts measurement, image measuring instrument technology to achieve high precision and high efficiency will inevitably become an important development direction of precision measurement technology. Therefore, higher requirements are put on the hardware system of image acquisition, the quality of the acquired image, the positioning of the image edge, and the system calibration. It has wide application prospects and important research significance. Therefore, this technology has become a research hotspot at home and abroad and one of the most important applications in visual inspection technology.
