The so-called vision sensor refers to the instrument that uses the image information of the external environment of optical components and imaging device, and usually uses the image resolution to describe the performance of the vision sensor. The accuracy of the vision sensor is related to the resolution and the detection distance of the object to be measured. The farther the distance to be measured, the worse the absolute position accuracy.
In industry, automatic detection equipment can obtain two-dimensional and three-dimensional images of the environment through the visual inspection and measurement system, and analyze and interpret them through the visual processor, and then convert them into symbols, so that the detection equipment can identify the object, and confirm the location of the object and the detection of defects.
Basic principles of vision sensors
The vision sensor processes the image captured by the camera to calculate the characteristic quantity of the object (area, center of gravity, length, position, defect, etc.), and output the data and judge the result of the sensor.
After capturing the image, the vision sensor compares and analyzes it with the benchmark image stored in memory.
For example, if the vision sensor is set to detect scratches on the appearance of the mobile phone, the sensor can uniformly scan and identify the entire appearance of the mobile phone, and identify and mark the scratch location through image comparison.
In addition, no matter where the scratch is located in the field of view, no matter the size and number of scratches, etc., the vision sensor can make a judgment.
Classification of vision sensor technologies
3D visual sensing technology
The acquisition of 3D image information is based on the acquisition and quantification of image information by some image sensors, which can directly acquire visible images, and indirectly acquire image information by monitoring radiation, infrared ray, X-ray or ultrasonic wave.
Different sensor technologies have different resolution, accuracy and noise, so it has become a research topic for the majority of scientists to extract useful information from the information obtained by image sensors for analysis.
3D vision sensors have a wide range of applications, such as automotive security systems, biomedical pixel analysis, human-computer interfaces, virtual reality, etc. These diverse applications are based on 3D vision image sensor technology.
Intelligent visual sensing technology
Smart vision sensor technology is a highly integrated and intelligent embedded vision sensing technology, it replaced the PC platform visual system, intelligent vision sensing technology will visual sensor, the digital processor, communication module and other peripheral equipment integrated together, become a can independently accomplish the image acquisition, analysis, processing, integration of information transmission, intelligent vision sensors.
Intelligent vision sensor, also known as intelligent camera, is the fastest developing new technology in the field of machine vision in recent years.
At present, into the factory, widely used in industrial testing, intelligent manufacturing automation.