Machine vision technology is currently used in industrial production testing, medical testing and other fields to achieve automation and intelligence. 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. At the same time, the image acquisition part of the machine vision system is mainly composed of LED light source, industrial lens and industrial camera. The image processing part is realized by image processing software. Therefore, in the principle structure, the image acquisition card is connected. Industrial Cameras and Image Processing Software. Below, we will come to understand what image capture card, at the same time, also make a certain explanation of its related nouns.
First of all, we need to understand what an image capture card is. As mentioned above, an image capture card is a connection device for the image capture and processing sections. It is a hardware device that can acquire digital image information and store or output it. The object to be measured passes through the camera's image acquisition 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.
1, 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.
2, the number of transmission channels <br> <br> in industrial production testing process, often requires more than vision systems operate simultaneously, in order to ensure a certain degree of 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. Weishi series of image capture card for all-round consideration for 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.
3, 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.
4, 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, quantified 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. Some high-end video capture cards can also directly compress the collected digital video data into MPEG-1 format files.
Since the analog video input can provide an uninterrupted source of information, the video capture card captures each frame of the video in the analog video sequence and passes the data to the PC system before acquiring the next frame of the image. Therefore, the key to achieving real-time acquisition is the processing time required for each frame. If the processing time of each frame of the video image exceeds the interval between two adjacent frames, data loss occurs, ie, a frame dropping phenomenon. The acquisition card first compresses the acquired video sequence and then stores it in the hard disk, which means that the acquisition and compression of the video sequence are completed together, eliminating the inconvenience of performing compression processing again. Different grades of acquisition cards have different quality acquisition and compression performance.
First of all, we need to understand what an image capture card is. As mentioned above, an image capture card is a connection device for the image capture and processing sections. It is a hardware device that can acquire digital image information and store or output it. The object to be measured passes through the camera's image acquisition 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.
1, 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.
2, the number of transmission channels <br> <br> in industrial production testing process, often requires more than vision systems operate simultaneously, in order to ensure a certain degree of 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. Weishi series of image capture card for all-round consideration for 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.
3, 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.
4, 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, quantified 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. Some high-end video capture cards can also directly compress the collected digital video data into MPEG-1 format files.
Since the analog video input can provide an uninterrupted source of information, the video capture card captures each frame of the video in the analog video sequence and passes the data to the PC system before acquiring the next frame of the image. Therefore, the key to achieving real-time acquisition is the processing time required for each frame. If the processing time of each frame of the video image exceeds the interval between two adjacent frames, data loss occurs, ie, a frame dropping phenomenon. The acquisition card first compresses the acquired video sequence and then stores it in the hard disk, which means that the acquisition and compression of the video sequence are completed together, eliminating the inconvenience of performing compression processing again. Different grades of acquisition cards have different quality acquisition and compression performance.
Small Coil Wire
Small coil wire is a reprocessed product from black Iron Wire, galvanized wire and PVC Coated Wire. The small coil wire with many features such as small coil size and weight, easy carrying and using, saving labor and improving efficiency is widely used for industrial sites as binding wire. In addition, sizes of small coil wire are various and can be customized on customer's request.
Small Coil Wire,Electro Galvanized Small Coil Wire,Hot-Dipped Galvanized Small Coil Wire,Pvc Coated Small Coil Wire
HENGSHUI YUZHENG IMPORT AND EXPORT CO., LTD. , https://www.yzironnails.com