2012年11月26日

PC monitors hard disk video recorder

1) wavelet transform technique is that the image signal in the time domain and frequency domain resolution at the same time the highest resolution. The kernel is a road in the compression and decompression, compression ratio of 70:1 or higher, compression complexity is about 3 times of JPEG, it is MPEG cited by, because wavelet decomposition of the image is very suitable for video image compression, tv media playerimage compression wavelet theory to become the most successful applications in the field of. The products are MPEG-4 hard disk recorders impact, also tends to be eliminated.

2) MPEG-1 and M-JPEG technology, MPEG-1 in real-time compression, each frame of data, the processing speed can be improved, PAL system, MPEG-1 can cater for up to 16 more than 25 frames / second compression speed, in the 352x288 definition, each frame size is only 2k. But MPEG-1 also has many shortcomings. One is the compression ratio is not big enough, in the case of video monitoring, required disk space is too large. Two is the image resolution is not high enough, the maximum resolution of only 352x288, three of the transmitted image bandwidth have certain requirements, the ordinary telephone line on narrow network to remote video transmission. Four is the MPEG-1 video frame is fixed to 25 frames per second, not lost frames in video, dvd creator the use flexibility is poor. Currently on the market using MPEG-1 DVR is mainly domestic product. The products tend to be eliminated completely by MPEG-4, product substitution.

3) H.263 has a higher compression ratio, but the image quality is better than MPEG4.

4) MPEG-4 has high compression ratio, image quality variable ( VCD to DVD definition ), MPEG4 compression ratio is much higher than that of MPEG-1, but M-JPEG cannot compare. Using MPEG-4 audio and video synchronization video required disk space is approximately the same as the image quality of MPEG-1 or M-JPEG of the space required by 1/10, so the users to choose to use MPEG-4 compression format hard disk recorders, hard disk recorders are compressed by MPEG-4 software and hardware compression compression two class. The image quality is also hard disk video recorder is a very important performance index, image quality and compression not only relevant, but also with the graphics, image processing technology and software technology, technical processing is undeserved, moving image often smearing, sawtooth and clarity of a series of low malpractice. As a result of these defects is very intuitive, user and contractors to.

5) in the MPEG-4 hardware compression on the basis of a number of improvements, is more advantageous in the network transmission, but also can set the video stream way, is a good cost-effective products.

Real time is a lot of user pays attention to a performance index, especially in the bank, the cashier, monitoring, real-time requirements are higher, but with hard real-time consumption, computer configuration, compression quality is proportional to, at the same time the real time video network transmission monitoring brings great pressure. Therefore, in ordinary places monitoring can be used as a real time video surveillance. As of 6.5 to 12.5 frames per second image can meet the security, hall, factory management, residential, hotels, shopping malls, elevators and other most site monitoring, but also network transmission effect, small consumption of hard disk, hard disk storage for longer.

In the network of highly developed today, the network remote monitoring has become an essential function of hard disk video recorder, due to bandwidth limitations, large compression ratio, good effect of network transmission of MPEG-4 products are most popular with users. Network monitoring is a dedicated client software, such as WindowsMediaPlayer, IE monitor.

- stability is hard disk video recorder and other hardware and software products are very important indicators. Stability is related to many factors, free video converter hard disk recorders stability is related to the following factors: 1) the motherboard, graphics cards, hard drives and other operating system; 2); 3) the hard disk video recording software; so in order to pursue the hard disk video recording stability, should try to choose a good reliability of the motherboard, such as MSI, gigabyte, ASUS, hard disk recorders image processing a large quantity, so don't be too cheap, use inferior or many years ago the technology behind the old video card.
posted by DO at 10:55| Comment(0) | IT | 更新情報をチェックする

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