Machine vision is the use of machines instead of the human eye to make measurements and judgments. Machine vision system refers to the machine vision products (Image acquisition devices. CMOS and CCD are two kinds of the target into the image signal and transmitted to the special image processing system. According to the pixel distribution and brightness, color and other information, into digital signals; The imaging system to these signals for various operations to extract the characteristics of the target and then according to the results of the discrimination to control the field equipment. The imaging system performs various operations on these signals to extract the characteristics of the target and then controls the equipment on-site based on the discriminatory results.
Vision system components：
- Lighting source
- Industrial cameras
- Image acquisition/processing card
- Image processing system
- Other external equipment
Rising labor costs and increasing user demands for quality have led to the use of vision machines to replace manual labor in the manufacturing industry on a daily basis. More and more monotonous, complex and tedious actions are being performed by machine vision.
Benefits of machine vision inspection：
- Inspection can be done in a short time so it is possible to inspect high-speed production lines where visual inspection is difficult.
- The software is becoming more and more powerful and simple training for operators can complete complex testing through simple settings and short import cycles.
- Avoid missed detection: from the presence or absence of judgment to size detection. It can carry a variety of detection modes. The human eye can not see the place can also be easily detected.
- Uniformity of standards: to avoid inconsistent results of human inspection due to different standards of each.
- Efficient detection: fast sampling speed and supporting various high-speed production lines.
Operation process: The camera captures images and transfers the captured data to the “Processing” stage.
Vision inspection machines Hardware used：
- Camera: Choose among different models in terms of pixel count, transmission speed, size, etc. depending on the subject.
- Lens: According to the different applications needs to choose a variety of focal lengths, interfaces and other types of lenses.
- Lighting: light-emitting elements. Need to choose different light sources for different materials and surface conditions.
Compared with traditional civilian cameras, industrial cameras have high image stability, high transmission capability and high anti-interference capability, etc. Most of the industrial cameras on the market are based on CCD (Charge Coupled Device) or CMOS (Complementary Metal Oxide Semiconductor) chip cameras. CCD is currently the most commonly used image sensor for inspections vision machines. It combines photoelectric conversion and charge storage, charge transfer, and signal reading in one and is a typical solid-state imaging device.
The salient feature of CCD is that it uses charge as a signal, unlike other devices that use current or voltage as a signal. These imaging devices form charge packets through photoelectric conversion and then transfer and amplify the output image signal under the action of drive pulses.
The difference between industrial cameras and ordinary cameras:
1、 Industrial camera performance is stable and reliable easy to install. The camera structure is compact and sturdy is not easy to damage, long continuous working time. It can be used in poorer environments. The general digital camera is unable to do these. For example, letting the civilian digital camera work 24 hours a day or a few days of continuous work will certainly be unbearable.
2、The shutter time of industrial cameras is very short which can capture objects in high-speed movement. For example, stick a business card on the fan blade of an electric fan and rotate it at the maximum speed, set the right shutter time, capture an image with an industrial camera. And still be able to clearly identify the font on the business card. It is impossible to achieve the same effect by capturing with an ordinary camera.
3、 The industrial camera image sensor is a progressive scan while the ordinary camera image sensor is interlaced. The progressive scan image sensor production process is more complex, low yield, low shipments. Such as Dalsa, Sony, and expensive.
4、 The frame rate of industrial cameras is much higher than that of ordinary cameras. Industrial cameras can take ten to several hundred pictures per second while ordinary cameras can only take 2-3 images.
5、Industrial cameras output bare data (raw data) which also tend to have a wider spectral range and are more suitable for high-quality image processing algorithms. Such as Machine Vision. The spectral range of images taken by ordinary cameras is only suitable for human eye vision. And after mjpeg compression, the image quality is poor, which is not conducive to analysis and processing.
About Shenzhen Sipotek Technology Co., Ltd
Started in 2002, Sipotek Technology is located in Shenzhen in China. The company designs and manufactures visual inspection systems with its avant-garde R&D department and a great experience in artificial vision technologies. The Sipotek Technology staff supports customers 360 degrees, from listening to their requests to the development of ambitious machines for quality control.
For Product Inquiries:
Contact Person: James Yuan
Company: Shenzhen Sipotek Technology Co., Ltd
Email: [email protected]