About Hai Kang video capture card Introduction---PCI-based plug-in acquisition card

VGA 640x480

QVGA VGA 1/4, the width is half of the VGA, respectively

(1) Collection type

Hai Kang wei ds-2ce16a2p-it3p 700TVL 1/3 "DIS ICR infrared Waterproof tube camera

Http://www.51anf.com/goods-18.html

The VGA capture card is inserted into the PCI slot of the PC, the interface braid thread is fixed on the card, there are two interfaces on the braid line, one is VGA in (the input of the VGA signal source) and the other is VGA out (VGA signal source loop-through output)

http://32013898.blog.163.com/blog/static/235099972007529103013312/

PCI support Plug and play!!!

(2) Basic concept of video card

Video card is also called video capture card, according to its use can be divided into broadcast-level video capture card, professional-level video capture card, civil-level video capture card. Their difference is mainly the collection of image indicators are different. The highest acquisition resolution for broadcast-level video capture cards is generally 768x576 (RMS) pal, or 720x576 (CCIR-601 value) PAL system 25 frames per second, or 640x480/720x480 NTSC system 30 frames per second The minimum compression ratio is generally less than 4:1. This type of product is characterized by high image resolution, video signal-to-noise ratio, the disadvantage is that the video file is large, the amount of data per minute is at least 200MB. Broadcast-level analog signal acquisition card with component input and output interface, used to connect Betacam camera/VCR, this kind of equipment is the most upscale video capture card, for television production programs. Professional-level video capture card level than the performance of the broadcast-level video capture card slightly lower, the resolution is the same, but the compression ratio is slightly larger, its minimum compression ratio is generally within 6:1, the input and output interface for AV composite terminal and s terminal, such products are suitable for advertising companies, multimedia company production programs and multimedia software. The dynamic resolution of the civil-level video capture card is generally 384x288,pal 25 frames per second. In addition, there is a kind of video capture card is more special, this is the VCD production card, from the use of it should be counted in the professional level, and from the image indicators, he can only be counted as civil grade products.

(3) Collection principle

On the PC, the video card can receive the analog video signal from the video input, collect the signal, quantify it into digital signal, and then encode it into a digital video sequence. Most video cards have the function of hardware compression, in the acquisition of video signal first on the card on the video signal compression, and then through the PCI interface to transfer compressed video data to the host. The general PC video capture card adopts the intra-frame compression algorithm to store the digitized video as AVI file, and some high-grade video capture card can also directly compress the digital video data collected into MPEG-1 format file.

Since the analog video input can provide an uninterrupted source of information, the video capture card collects each frame of the analog video sequence and passes the data to the PC system before capturing the next frame of image. Therefore, the key to achieving real-time acquisition is the processing time required for each frame. If the processing time of each frame video image is more than the time between two adjacent frames, the loss of data is also the phenomenon of dropping frames. Capture card is to get the video sequence first compression processing, and then into the hard disk, that is, the acquisition and compression of the video sequence is done together, eliminating the inconvenience of compression processing again. Different grades of acquisition card with different quality of the acquisition and compression performance.

(4)

Http://zhidao.baidu.com/question/233802950.html

Http://baike.baidu.com/view/4188.htm

http://www.eefocus.com/test-measurement/261043

Http://wenku.baidu.com/link?url= Xr6mwj5rluqeizvywhov5leuyt6udybgkqsg3cyoktpuiglanuojgon7ah-qqliw6ov7j5tc43qvmvk4vezjbgrji8cq-mr7hvqz7fo-5js

http://blog.csdn.net/zhuweigangzwg/article/details/17222581

About Hai Kang video capture card Introduction---PCI-based plug-in acquisition card