In our often chase to catch a fashionable trend for security surveillance , high-definition doomed to become a pariah here . Especially in the past two years , high-definition surveillance system heated discussions , and megapixels IP Camera features are also competing in different market, one after another. But some people do a standard or concept disoriented , confused . A wide variety of cameras, each with its own statement, only thing is that both claimed to beHD IP Camera . But asked what kind of camera is the HD network camera , but no agreement. In fact, in this area of security cameras , HD and megapixels thing really is not the same code . ......
What megapixels ?
In fact, when we say that there are a few megapixels camera , we do not understand its frame rate, scan mode, to ensure the degree of color and so on. Therefore, we can not know more performance and better surveillance cameras . The so-called " megapixels " is not a very clear standard . It is merely a description of the number of pixels of the camera image sensor . When any of a number of pixels the camera has reached 1 million , you can call megapixelsnetwork camera . In the current products on the market , the minimum number of pixels megapixels of 1.3 million pixels , and the highest number of pixels can reach 10 million pixels. Camera in this range can be counted as megapixels camera .
Real practical megapixels network camera with pixels in 1.3 to 3 million ; currently on the market in 720p (1280 * 720) and 1080p (1920 * 1080) camera surveillance market to occupy a high of more than 90 % market share , in terms of product monitoring effects or network environment, both standard surveillance cameras more in line with development of the market . There are data to show that 1.3 million pixels 720p , 1080p to 200 million pixels.
What is HD ?
"HD " standard has been the subject of debate within the industry . The so-called "HD" should be a complete technical concepts, including from the filming, production, storage , distribution and display of the complete process . Currently more mature is for "HD display " defines the system, as defined by the United States Advanced Television Systems Committee ( ATSC) HD TV for the following three : 720P (1280 × 720 progressive scan ), 1080i (1920 × 1080) interlaced , 1080P (1920 × 1080) progressive scan ) . 720P as a transitional index , in fact, has gradually be included in the scope of the " standard definition " of . HD 1080P truly present the equipment manufacturers strive to promote and popularize a standard . Based on this fact to measure , 720P physical pixel is about 100 million pixels , 1080P corresponds to about 2 million pixels , the higher megapixel devices is "high definition " real barriers to entry .
HD standard
SDTVD1 ( standard definition ) for the 480i format , the same definition and NTSC analog TV , about 35 million pixels .
SDTVD2 ( standard definition ) to 480p format , the same definition and progressive-scan DVD , about 35 million pixels .
HDTVD3 ( High Definition ) format to 1080i interlaced resolution 1920 * 1080i, about 2 million pixels.
HDTVD4 ( high definition ) to 720p format , progressive scan resolution of 1280 * 720 levels, about 100 million pixels .
HDTVD5 ( High Definition ) format to 1080p , progressive scan resolution of 1920 * 1080p, about 2 million pixels.
Megapixels is equal to HD ?
HD is an important part of megapixels , while megapixels is also important to some extent based on the HD . In effect , the whole HD and megapixels are pointing to a more advanced level than ordinary clarity , so many features and measure the effect that they are very close , but in essence , they have a very big difference.
If you say the definition , it can be broken down into two aspects, namely high-definition and high-definition camera lens system . From the standard , the system is clearly better than standard definition camcorder HD requires more comprehensive. Compared with ordinary definition cameras, HD cameras in addition to following a standard definition than the general camera uses cmos sensor and a digital signal processing technology . Some cameras also put as an important technical support progressive scan HD monitoring equipment .
For HD monitoring systems , high-definition network camera is just the whole system is an important front . To achieve true high-definition surveillance systems , in addition to have a high-quality analog signal acquisition devices, video signal compression technology , playback signal transmission technology , video browsing, and audio and video files must also be part of a comprehensive system of support for HD . For users when monitoring , the HD IP Camera only cover all aspects of the front , monitoring and management platform , information storage, monitoring terminal display system , the entire system can only achieve high definition .
Therefore, the current market for some simple network camera megapixels will say a speech HD monitor is undoubtedly very absurd. For the camera , if only the tip of the lens definition , without performance of video processing techniques or other sensors , then the number of megapixels is not necessarily return the lens effect of HD .
Megapixels camera is equal to the HD lenses ?
Megapixels definition of the relationship between the monitoring camera is not limited to , wherein the surveillance camera is very important .
View: megapixels camera lens is equal to HD . " The market generally believes that it can be called up to 720P megapixels camera ." Which is "HD Lens" think outside besides megapixels camera.
Second point : megapixels camera is not equivalent to the HD lens. " Megapixels " literally understood even more than one million pixels, but 1,000,000 , 1,300,000 , 2,000,000 , 5,000,000 pixels , although both belong to the megapixels , but not entirely belong to the " HD lenses ."
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