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The image acquisition of the soft pressure card is done by an image acquisition chip (such as FUNSION 878A), and the image compression is implemented by software, that is, by computer CPU operation.
Soft compression products, due to the difficulty of development, there are not many varieties on the market, mainly PIC02000 of Canada, ETHER8000 series of Shenzhen Ether Company, Korea PICASO, Korea KODICOM, etc. In addition, there are some illegal pirated versions of PICO, PICASO, KODICOM, etc. Rename the product yourself. Due to the difficulty in the development of soft compression products, the development of such products is basically a company with strong research and development strength. The software design technology is high in content. If used properly, the software performance and stability are better.
A) Canada PIC02000 is an early foreign product. Due to the rapid development of computer technology and the continuous introduction of new products, the product will gradually withdraw from the market. The image quality of this product is not good enough, especially when the image is moving, there will be sawtooth and tailing. phenomenon. In addition, the product is also behind the modern hard disk recording technology in image acquisition technology, especially when the image is switched, the frame loss is severe, resulting in poor image continuity, and the action jumps, and the product has One drawback is that color adjustment is inconvenient. Single-chip card is connected to multiple lenses. Adjusting color is not only impossible to software color, but also can not be used to color each picture separately. However, this product is popular among many consumers because of its simple installation, stable operation, compression using MPEG-4 format, low consumption of hard disk and low price. In particular, low-end manufacturers use more, but with the introduction of ETHER8000 products this year, the market share and price of PIC02000 have further declined.
B) Ether's ETHER8000 series DVR is a high-tech hard disk recording product launched this year. The product uses modern computer technology, both hardware and software design has been greatly improved than the early products. From the hardware point of view, the product abandoned the previous FUNSION878A, and adopted the XL series more advanced than FUNSION878A. Image acquisition chip, which compensates and overcomes many defects of FUNSION878A. The performance is superior. From the software point of view, ETHER8000 adopts the most advanced UHF switching technology in the world, which enables each image acquisition chip to collect up to 50 frames per second, which has higher chip utilization and lower hardware cost. In addition, the product also has a number of special features in the image processing technology, the image is clear and high, the moving image is not trailing, sawtooth, etc., and the single-chip four-way acquisition card is used to monotone software for each lens picture. Other performance and function are complete, the stability is good, the image coding adopts MPEG-4 compression format, the network effect is good, and the Windows Media Player tool that comes with the WINDOWS operating system is supported for remote viewing. The shortcoming of this product is that it cannot be installed under WINDOWS98. However, it can only be installed in Windows2000 Professional/Server/XP. This defect is inconvenient in use. It is said that the reason why it does not want to support WINDOWS98 is to encourage users to adopt stable WINDOWS2000 to further improve its stability.
C) Korea PICASO is an early Korean hard disk video product. A year ago, this product was very popular in China, but because of the rapid update of computer technology, compared with the new generation of hard disk video products, the performance of this product is somewhat backward. The product is opposite to ETHER8000, only in WINDOWS98. Installed below, but can not be installed under WINDOWS2000, because the development of the video system, WINDOWS2000 has not yet been available, does not support WIN2000 is understandable, in addition, the product is particularly picky about the motherboard and graphics card, installation is troublesome, the compression format is consumed The large M-JPEG format of the hard disk, due to the large amount of data, the network performance is not good.
D) Korea KODICOM, until now, domestic applications are still relatively extensive, the performance of this product is superior to PICASO in all aspects, but the compression format is not advanced enough, the wavelet transform is adopted, the hard disk consumption is still large, and the network performance is not excellent, KODICOM and Like the PICO2000, when the card is monitored for 8 channels, the switching technology is backward, and the drawbacks of the graphics jitter are not overcome. In the next two years, the product will also face the replacement of the new generation of hard disk recorder ETHER8000.
2) Hard press card <br> Hard press card, its image acquisition and image compression are realized by the chip on the board. The difference between the soft compression and the soft compression is that the product writes the image compression algorithm software into the DSP chip on the hardware board, allowing the DSP to replace the CPU to calculate the pressure of the CPU operation, if your DVR computer host CPU frequency Low, the number of monitoring channels is large, and it requires full real-time. If the hard disk space is particularly large, a hard pressure card can be used. Because hard compression does not use CPU resources and resources are sufficient, most hard compression uses high-resolution display (high resolution is not used when recording, so the image resolution is not higher than soft compression after recording), and large bit stream compression is used. The image clarity is high, but this also brings a new problem, that is, the amount of data is too large, so the hard compression consumes a large hard disk, the video storage time is short, and the network transmission also brings great pressure. Not suitable for multi-channel remote monitoring. In addition, the image compression DSP chip in hard compression is far less powerful than the CPU design, and the heat is large. The maximum temperature is more than 80 degrees. If four hard compression cards are inserted side by side into the computer, 16 channels of real-time video are formed. In the absence of good heat dissipation, summer is particularly prone to crashes, so installing hard disk recordings in hot southern cities has to consider this issue.
Hard compression also has an insurmountable flaw, because the hardware cost of hard compression products is too high, the price can not be reduced, and even some compression cards do not have advanced encryption technology, using expensive USB interface dongle to complete encryption, which not only increases The hardware cost of the board also reflects the high technical content of the product. If a DVR manufacturer can't realize the encryption and programming of the MCU, it can be considered that its R&D strength will not be strong. The quality of the developed product needs to be cautious. Inspection (USB interface dongle, mainly used for pure software products to prevent piracy, and products with hardware circuits mostly use chip encryption on the circuit board), because the hard pressure card is expensive, mainly used in high-end places, it is difficult to promote to Low-end places, such as residential areas, small and medium-sized hotels, factory security, plant monitoring and management, home monitoring and other places.
At present, the hard-pressed cards appearing on the market are mainly manufactured by domestic manufacturers. They do not involve hardware chip driver development and image acquisition and compression operations. They are secondary developments, and there are many types of hard compression products. The software and hardware are basically the same, but the software of each manufacturer is stable. Sex is not the same as the appearance, the core things are the same. However, it is worth noting that the hard-compressed video software developed by some domestic companies is not mature enough, and there are unstable phenomena such as crashes.
Through the comprehensive comparison of various soft and hard compression video products above, each product has its advantages and disadvantages. Therefore, users must choose a suitable hard disk video card according to their own location and other conditions. For example, if you need 16 channels of real-time hard disk recording, you do not need remote monitoring, you can choose hard pressure card. If the number of monitoring channels is below 8 channels, Real-time, soft compression products can completely replace hard compression, and require multiple remote monitoring, and can choose soft compression products in MPEG-4 compression format close to real-time (6.5-18 frames per second). Not only the network has good effects, the recording time is long, and the real-time performance is not bad. The eyes look almost real-time. These products are widely used in the United States, Taiwan, Shenzhen and Guangdong, and the factory management monitoring in Guangdong coastal areas is the largest.
[ Huaqiang Security Network News ] I believe everyone knows that video capture cards mainly have two major categories: soft pressure cards and hard pressure cards, but do you know the difference in performance? See below for the analysis of the soft and hard cards in the video capture card. 1) Soft pressure card <br> Soft pressure card, mainly a hardware circuit board product with a plurality of image acquisition chips as the core, with peripheral circuits and components, complete image acquisition function, soft pressure card from the appearance On the above, each manufacturer does the same, the difference is small, because the design circuits of each manufacturer must be designed based on the model circuit provided by the chip data.