The entire machine vision system is divided into two sections: image acquisition and image processing. In the image acquisition system of analog industrial cameras, the image acquisition card is an important component connecting these two major sections. The image acquisition card is a communication device of an image acquisition part and a processing part, and is a hardware device that can acquire digital image information and store or output it. The object to be measured passes through the image acquisition of the camera and the photoelectric conversion of the image sensor it contains, so that the captured object is converted into an analog image signal, and these signals are converted into a digital image signal via an image capture card and output to an image processing software. A series of operations.
In the entire process of its operation, there are many basic concepts that we need to understand.
A/D conversion
Above we learned that the image capture card can convert analog signals to digital signals, which plays an important role in image acquisition of the entire machine vision system. The analog-to-digital conversion of the machine vision system image acquisition card is called A/D conversion, and the corresponding component that realizes conversion is called an A/D converter. Corresponding to the term D/A conversion, it is clear that D/A conversion refers to the conversion of digital signals to analog signals.
Number of transmission channels
In the process of industrial production inspection, many visual systems need to be operated at the same time to ensure certain efficiency. Therefore, in order to meet the needs of the system operation, under normal circumstances, machine vision system image acquisition card can simultaneously A / D conversion of multiple cameras. The number of transmission channels refers to the number of simultaneous conversions using the same image acquisition card. Long Rui Zhike series of image capture card for the sake of all users, fully consider the needs of users, R & D and production of the acquisition card optional transmission channels are single-channel, dual-channel, four-channel mode for users to choose.
Sampling frequency
Sampling frequency is a main technical indicator of the machine vision system image acquisition card. It refers to the frequency of the image acquisition card in the acquisition of image information, and reflects the speed and ability of the acquisition card to process the image. Especially when high-speed image acquisition is performed, the sampling frequency is an important parameter for deciding what kind of image acquisition card is selected.
Frames and fields
A video signal can be progressively sampled for a series of frames, or it can be interleaved for a sequence of interlaced fields. In this interlaced sampled video sequence, half of the data for a frame is Sampled at time sampling intervals.
Features:
On the computer through the image capture card can receive analog video signal from the video input, the signal is collected, quantized into a digital signal, and then compressed into a digital video. Most image acquisition cards have the function of hardware compression. When the video signal is collected, the video signal is first compressed on the card, and then the compressed video data is sent to the host through the PCI interface. The general PC video capture card uses the intra-frame compression algorithm to store the digitized video as an AVI file, and some high-end video capture cards can directly compress the collected digital video data into MPEG-1 format files in real time.
Machine vision technology is currently used in industrial production testing, medical testing and other fields to achieve automation and intelligence. Lonnet Zhike () introduced the new GigE Vision PoE+ frame grabber PCIE-3504PoE, which provides comprehensive support for a wide range of machine vision applications. The power protection feature of the PCIE-3504PoE ensures that the camera and other devices are protected from damage. In addition, PoE ports can be monitored in real-time through friendly PoE management utilities and APIs to predict possible failures in advance. Moreover, the PoE+ power supply provided by the network card is fully capable of powering the camera head in security monitoring applications.
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