The difference between soft compression and hard compression
At present, the popular hard disk video cards on the market mainly include soft compression hard disk video cards and hard compression hard disk video cards.
1) Soft-compressed video card Soft-compressed video card mainly consists of a number of image acquisition chips as the core, a hardware circuit board product that completes the image acquisition function with peripheral circuits and components, and a soft-compressed video card From the perspective of appearance, the manufacturers do basically the same, and the difference is very small, because the circuits designed by each manufacturer must be designed based on the sample circuit provided by the chip data.
The image acquisition of the soft-compressed video card is completed by an image acquisition chip (such as FUNSION 878A), and the image compression is achieved by software, that is, by computer CPU operation.
Due to the difficulty of development, there are not many varieties on the market for soft compression products, mainly Canadian PIC02000, Shenzhen Ethernet Company's ETHER8000 series, Korean PICASO, Korean KODICOM, etc. In addition, there are some illegal pirated PICO, PICASO, KODICOM, etc. Rename the product yourself. Because the development of soft compression products is particularly difficult, those who can develop such products basically belong to companies with strong R & D strength. The software design has high technology content. If used properly, software performance and stability are relatively good.
A) Canadian 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 aliasing and smearing. phenomenon. In addition, this product lags 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 jumps. In addition, the product also There is a defect that the color adjustment is inconvenient. A single chip is connected to a multi-channel lens. Not only can the color adjustment not be adjusted by software, but also each screen can not be adjusted individually. However, this product is also popular with many consumers because of its simple installation, stable operation, compression using MPEG-4 format, small consumption of hard disk, and low price. Especially low-end manufacturers use more, but with the introduction of ETHER8000 products this year, the market share and price of PIC02000 have dropped further.
B) ETHER8000 series hard disk video recorders of Ether Company are high-tech hard disk video recording products launched this year. The product uses modern computer technology, both in terms of hardware and software design are greatly improved than earlier products, from the hardware point of view, the product abandoned the previous FUNSION 878A, and adopted a more advanced than FUNSION 878A XL series image acquisition chip, this chip makes up and overcomes many defects of FUNSION 878A. The performance is more superior. From the perspective of software, ETHER8000 adopts the world's most advanced UHF switching technology, so that each image acquisition chip can collect up to 50 frames per second. The chip utilization rate is higher and the hardware cost is lower. In addition, the product also has many special features in image processing technology, the image is clear and high, the moving image has no smearing, sawtooth, etc., and the monotonous software toning of each lens screen of the single-chip four-channel capture card is realized. Other performance and functions are complete, good stability, image coding uses MPEG-4 compression format, good network effect, and supports Windows Media Player tool that comes with WINDOWS operating system for remote viewing. The shortcoming of this product is under WINDOWS98 It cannot be installed, but can only be installed on Windows 2000 Professional / Server / XP. This defect brings inconvenience in use. It is said that the reason why I do not want to support WINDOWS 98 is to encourage users to adopt the 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 due to the rapid update of computer technology, compared with the new generation of hard disk video products, the performance of this product is somewhat lagging behind. This product is contrary to ETHER8000, only in It can be installed under WINDOWS98, but cannot be installed under WINDOWS2000, because WINDOWS2000 was not yet available when the video system was developed. It is understandable that WIN2000 is not supported. In addition, the product is particularly picky about the motherboard and graphics card. Installation is troublesome. Compression format is adopted. It is an M-JPEG format that consumes a large amount of hard disk. Due to the large amount of data, the network performance is poor.
D) South Korea's KODICOM has been widely used domestically until now. The performance of this product is better than PICASO in all aspects, but the compression format is not advanced enough, the wavelet transform used, the hard disk consumption is still large, and the network performance is not excellent. Like PICO2000, when one card has 8 channels of monitoring, the disadvantages of graphics jitter are not overcome due to the backward switching technology. In the past two years, the product will also face replacement by the new generation of hard disk video recorder ETHER8000.
2) Hard-compressed video card
For a hard-compressed video card, both image acquisition and image compression are achieved through the chip on the board. The difference with soft compression is mainly that the product writes the image compression algorithm software into the DSP chip on the hardware board, let DSP replace the CPU to calculate, and reduce the pressure of CPU calculation. If your hard disk video recorder computer host The CPU frequency is low, the number of monitoring channels is large, and full real-time is required. If the hard disk space is particularly large, a hard compression video card can be used. Because hard compression does not use much CPU resources and has sufficient resources, most hard compression uses high-resolution display (the high resolution is not used when recording, so the image clarity after recording is not higher than that of soft compression), and large bits are used Stream compression, high image clarity, but this also brings new problems, that is, the amount of data is too large, so hard compression consumes a large hard disk, video storage time is shorter, and network transmission also brings great The pressure is not suitable for multi-channel remote monitoring. In addition, the image compression DSP chip in hard compression is far less scientific than the CPU design, and its heat generation is large, with a maximum temperature of more than 80 degrees. If four hard compression cards are inserted side by side into the computer, a 16-channel real-time video is formed In the absence of good heat dissipation conditions, summer is particularly prone to crashes, so installing a hard disk video in the hot southern city has to consider this problem.
Hard compression also has an insurmountable defect, because the hardware cost of hard compression products is too high, the price cannot fall, and even some compression cards do not have advanced encryption technology, and use expensive USB interface dongle to complete encryption, which not only increases It also reflects the characteristics of the product's technical content is not high enough. If a hard disk video recorder manufacturer can't even realize the encryption and programming of the single-chip microcomputer, it can be imagined that its R & D strength will not be very strong, and the quality of the developed product It needs to be carefully investigated (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). Due to the high cost of hard compression video cards, it is mainly used in high-end venues. It is difficult to extend to low-end places, such as residential quarters, small and medium-sized hotels, factory security, plant monitoring and management, home monitoring and other places.
At present, the hard compression video 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 development. There are many kinds of hard compression products, and the hardware and software are basically the same. Software stability is different from appearance, the core things are the same. However, it is worth noting that the hard compression video software developed by some domestic companies is not mature enough, and there are instability phenomena such as crashes.
Through the above comprehensive comparison of various hard and soft compression video products, each product has its advantages and disadvantages. Therefore, users must select a suitable hard disk video card according to their own location and other conditions. If 16-channel full real-time hard disk video recording is required and remote monitoring is not required, a hard compression video card can be selected. Full real-time under 8 channels, soft compression products can completely replace hard compression, but need multi-channel remote monitoring, you can choose near real-time (6.5-18 frames per second) MPEG-4 compression format soft compression products. Not only the network effect is good, the recording time is long, but the real-time performance is not bad. The eyes seem to be close to real-time. Such products are widely used in the United States, Taiwan, Shenzhen, and Guangdong. Among them, the factory management and monitoring in coastal areas of Guangdong have the largest amount of monitoring.
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