We know that video capture card is also called video card. It is to input the mixed data of video data or video and audio output from analog cameras, VCRs, LD video players, and TV sets into computers and convert them into computer-readable digital data stored in computers. Become an editable video data file.
According to the video compression method, the video capture card can be divided into soft compression cards (consuming CPU resources) and hard compression cards. Next we will compare the video with you to compare the hard and soft compressed DVR.
Soft compression DVRWith soft card DVR we are generally called soft compression DVR, in fact, is a video capture card, with the card is equipped with monitoring software to achieve video surveillance, video, playback history video and remote monitoring and other functions, the hardware is one or more video capture chip Receives signals from analog cameras, converts them to digital signals, and then enters the motherboard directly or via a PCI bridge chip from a PCI golden finger. The original digital video signal, in the memory to perform CPU instruction operations, the video compression and processing, and then stored to the hard disk. Raw video data is also sent directly to the video card and previewed by the monitor.
The circuit board of the soft card is very simple, there is no compressed chip and temporary storage chip on the board, the cost is low, generally about 1/3 of the hard compression, so the price is its biggest advantage, in addition, the soft compression DVR is compressed by the CPU The compression quality is good and the video definition is high. In the case of sufficient CPU resources, the soft compression DVR is no less than a hard compressed DVR in video recording, network transmission and other functions.
Hard compression DVRHard compression DVR, also known as video capture compression card, is basically the same as the soft compression principle. The difference is that after the analog video is converted to a digital signal, it is not directly sent to the motherboard, graphics card, or memory through PCI, but is first compressed by a hard DVR. The DSP that comes with the card instead of the computer CPU executes the compression algorithm instructions, compresses the memory chips on the DVR card, and then enters the motherboard through the PCI gold finger. Therefore, the hard-compressed DVR circuit board has more DSP or other compression chips and memory chips.
The main advantage of hard-compressed DVRs is mainly in the monitoring of large number of channels, such as 32-channel full real-time monitoring video. Soft compression is difficult to achieve. This market gap can be occupied by hard compression.
The advantages of soft compression and hard compression DVR 1DVR preview image qualityThe quality of the preview image is mainly determined by the image resolution and the video capture chip. Soft Compression DVR is the best 9-bit ultra-high image quality, other DVRs are 8-bit image quality, including hard-compressed DVR cards are also common 8-bit image quality.
2 video qualityThe video quality of the DVR depends on the compression algorithm and the processing capability of the compressed chip. An advanced compression algorithm can be used on a hard compression card to achieve video compression through other compression chips such as DSP or TI, or it can be used on a soft compression card. The CPU implements video data compression. When the CPU is adequate (less than 90%), the soft compression DVR video quality is not worse than the hard compression card, and the 9-bit soft compression video quality can exceed all 8-bit hard compression.
3 network performanceThe performance of the DVR network depends on the compression algorithm and the technical level of the DVR developer's network monitoring software, and has nothing to do with soft compression or hard compression. Advanced compression algorithms have a large compression ratio, small data traffic, low bandwidth requirements, and better network performance. On the network side, soft compression is mostly better than hard compression cards, perhaps because it is more powerful to develop soft compression DVR manufacturers. It is difficult to develop soft compression, so soft compression DVR companies that can survive and grow have strong R&D capabilities.
4 hardware costsIn terms of board cost and price, the soft compression card has obvious advantages. The price of soft compression card is generally only 1/4 or 1/3 of the hard compression card. Therefore, the cost-effective soft compression DVR is widely used in high, middle and low-end locations, occupying more than 80% of the world's market share. International users basically use soft compression DVR cards, but because China's national conditions are not the same, temporary hard compression card occupies a considerable market, especially hard compression cards in inland areas still have a certain market demand.
5 service lifeThe DVR product is updated quickly, and the fastest change is in the compression algorithm and software functions. The soft compression card has strong flexibility. It does not partially solidify the software and the compression algorithm in the chip. The upgrade is flexible and cannot be eliminated easily. Once there is more High-efficiency compression algorithms can quickly improve your DVR quality through free software upgrades. Hard-compressed DVRs write compression algorithms into DSP chips, causing troublesome upgrades and short lifetimes.
6 compression efficiencyIn terms of video compression capabilities, hard compression is better than soft compression. Since the soft compression card uses CPU compression and consumes computer resources, rational configuration of the computer is the key to the long-term stable operation of the soft compression DVR.
We have been engaged in the R&D and production of machine vision and its core equipment for more than ten years, and have been at the leading level in the field of high-end machine vision. Video capture card as an important part of machine vision, in its research and development Microvision company fully demonstrated the strong technical strength, product stability, after-sales perfect, all video capture card drive, once developed once and for all, replacement models do not need to re-development, The perfect image quality is believed to be your best choice.
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