Teach You How To Choose Embedded Dvr
With Technology Gradually mature and complete
, embedded DVR has entered a phase of unprecedented prosperity. How does the procurement Embedded DVR? Market The brand is also increasing, the quality quite a mixed bag, then embedded DVR how to buy it right? This paper Contractors Perspective describes how to practical application, choose a most suitable own products.
Skills 1: Select the strength and good service factory
The mainstream market as a security product, at home and abroad to provide embedded DVR's Enterprise Very much, but truly the core of chip-level technology development capabilities are very few manufacturers, a large part of business is to provide products through OEM. For engineering companies, the bidding process in the project, select the product is selected manufacturers. Therefore, before purchasing products, should be to the manufacturers to understand, to understand whether the company has certain strengths and industry position. In addition, product homogeneity serious today, manufacturers of after-sales service levels Contractors Select one of the factors should be given priority. Manufacturer's service capabilities in addition to specialized after-sales service system embodied in the other, also in the factory to the needs of specific projects, provide a comprehensive industrial applications Solutions .
Skills 2: Choose the product for their needs
Meet the requirements in the initial choice of the manufacturers then, we have to offer against the manufacturers of products as described in the preliminary selection. Of course, business users and projects according to their own needs, choose the right products their needs, this is the pragmatic choice. If you select a feature-rich embedded DVR, but they simply do not have access in the works of these features, it will cause costs to rise. Therefore, the need to focus on the following:
1, image clarity Image sharpness is a controversial topic, each user would like the purchase of the product image is clear, but technically speaking, the higher the resolution, disk storage space occupied by the greater need to higher net transmission bandwidth. Therefore, allowing users to adjust according to the actual situation the level of design definition, is the best design. Therefore, the user under the (project) the actual situation, select the appropriate user's product, is the business sense for the project.
Now, the market is still the mainstream resolution of CIF format resolution, but there are multiple manufacturers have developed full D1 embedded DVR, but also high-definition, but require a high stream. More respected on the market today is dual-stream technology, used D1 resolution video recording, network transmission used CIF resolution, it solves the video quality and network bandwidth limitations when the issue of transfer.
2, real-time image Present, real-time image is the industry's highly of contention between a topic. China's DVR products in a major publicity in common is that no matter how many roads, both campaigns could achieve full real-time capabilities. In fact, when choosing DVR, the DVR to consider is that this product really can achieve all time? Or really need to do it full time? On the video rate, the fact that all of the DVR in real time for all 25 images / second (PAL format) or 50 Figure fields / sec (PAL format), any more than this target advertising are unrealistic. Also be noted that, to observe the real-time motion picture, see if there is delay and ghosting, while observing the highest stream is.
3, compression algorithm Present, embedded DVR image compression algorithm used mainly MJPEG, MPEG-4, H.264, etc., these methods have advantages and disadvantages. To achieve the full real-time, high-definition, low mosaic, highly smooth image quality and smooth, etc., there must be at the expense of Hard disk Storage space and network bandwidth cost. Therefore chosen that meets the image quality to meet customer demand, but also save hard disk storage space, while ensuring low-bandwidth networks in real-time transmission of the compression algorithm of products is the wish of business each project. From the perspective of current technology, H.264 compression algorithm to meet the high-definition image quality in the premise, compression rate than MPEG-4 has improved greatly, and its technical characteristics more suitable for IP networks, wireless network transmission. Currently, H.264 compression algorithm is also not real high compression ratio, and true there is a certain gap between the H.264 algorithm, it is the ideal of a compression algorithm.
4, the network function The impact of the digital monitor, the user of the DVR network function in urgent demand. Therefore, DVR functionality is also in the purchase of network must be taken into account. In a large surveillance platform, a large number of front-end layout Camera And the DVR, then, if you can center on the device monitoring and management system for remote control, it is very important. Therefore, we not only consider whether the product provides the Ethernet network interface, depends on the availability of supporting centralized monitoring and management system software on the DVR through the network to achieve real control.
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by: heiyou
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