Traditional analog cameras are unable to meet the needs of high-definition image capture, high-definition has become the mainstream of today's video surveillance. To achieve high-definition video surveillance, will be inseparable from HD cameras . Therefore, megapixels HD network camera products have emerged. In this paper, a simple analysis of the principles and results under megapixels HD cameras from JOOAN.
Megapixels HD cameras, referring to high-definition cameras based on IP network transmission. As an example, with an ordinary form of HD network camera, from front to back in sequence containing lenses, IR-cut filter, image sensor, and image processing clock synchronization coding compression motherboard, power supply and I / O network interface board.
In all parts of the form, the most crucial is the image sensor,Its index is good or not directly affect the image consequences of high-definition network camera . Currently on the market it takes the HD CMOS network camera as a photosensitive element, compared with a CCD sensor. There is advantage in high-definition network camera the application.
Currently pinhole camera, megapixels camera just a general designation in the industry for high-definition network camera, refers to more than a million and a million-pixel high-definition camera, but the industry has not yet constitute a related scale to define megapixels and HD association. The megapixels, referring to the effective number of pixels used in network camera's sensor reaches more than one million, at the same time, this high-definition camcorder output field screen resolution of at least 1280 × 720. Today's mainstream 1.3M and 2M, even higher 5M belong megapixels level network camera, the image resolution is at least normal output 720P or 1080P.
From the standards of current industry accepted , video resolution up to 720P high-definition screen is the most basic requirement, and even some places call it HD-ready, since the strict sense from speaking, 1280 × 720 resolution has not yet reached one megapixel. And generally true high-definition images recognized , the video picture resolution needed to reach 1920 × 1080, commonly known as 1080P.
From the above mentioned and the video footage to identify the rate is not difficult to identify, the image from megapixels HD camera video footage and traditional analog cameras periods can not be compared, megapixels HD camera has big progress of clarity, image field extended period Imitate cameras, they are the most convex play advantage.
Screen resolution megapixels HD cameras are several times better than the traditional definition camcorder. In addition to video picture clarity of heights, there is the practical application of one of the main requirements that real-time video picture to the PAL system, the need to achieve 25 frames / sec transfer and playback frame rate.