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  • Million-pixel high-definition camera using principles and techniques

        Traditional analog cameras can not be satisfied with the demand for high-definition image capture, HD has become the mainstream of the development of today´s video surveillance. To achieve high-definition video surveillance, can not be separated from HD camcorder, thus megapixels high-definition network camera products have emerged.
        Million high-definition camera principle
        Megapixels high-definition cameras, high-definition camera IP-based network transmission. The formation of a common definition network cameras for example the first volume, from front to back in sequence contains a lens, IR cut filter, the image sensor, clock synchronization and image disposal coding tightening motherboard, power supply and I / O network interface board.
        In all forming member, the most critical image sensors, indicators of good or not directly affect the consequences of the HD webcam. Most HD IP cameras currently on the market are taking CMOS sensor as, but compared with the CCD sensor, the presence of the upper hand on the HD network camera.
        HD imaging results
        Pinhole camera, megapixel camera for high-definition network camera industry a general term, refers to a million and more than one million pixel high-definition camera, but the industry has not yet constitute a coherent scale to define megapixels and HD association. The so-called megapixels, the effective number of pixels of the sensor used in IP cameras reached more than one million at the same time, this HD camcorder output field screen resolution of at least to 1280 x 720. Today´s mainstream 1.3 million pixels, 200 pixels, or even higher 5-megapixel megapixels IP cameras are normal output image resolution of at least 720p (1280 x 720) or 1080P (1920 x 1080).
        Judging from the current industry recognized standards, the video screen resolution of 720P HD is the most basic requirement, even some place called HD-ready, speaking from the strict meaning 1280 x 720 resolution has not yet reached 100 million pixels. And is generally recognized as the true high-definition images, video screen resolution needed to reach 1920 × 1080, that commonly referred 1080P.
        Not difficult to see from the above-mentioned discrimination rate of the video screen, the video screen supplied by the million-pixel high-definition camera period of traditional imitate camera can not compare the progress of clarity, the expansion of the field of view of the image, are the most convex The advantage of starting.
        The one hand, from the resolution of numerical control point of view: the resolution analogy from Table 1, we can plainly see, has a screen resolution of million-pixel high-definition camera supply many times greater than the advantages of conventional cameras definition.
        In addition to the video picture clarity compete, the practical application there is a very major requirements, real-time video screen, the PAL format, you need to achieve 25 frames / sec transfer and playback frame rate. Currently the most megapixels cameras on the market in the pattern of 720P or 1080P resolution may reach 25 frames / second high frame rate transmission and light, and the most up to 2560 × 1920 resolution, ultra-high-definition camera can not achieve such definition of real-time.
        In actual applications, customers tend to have very aware of the monitoring needs, as well as to achieve the objectives and requirements. Such as bank teller control, need to be able to clearly see the face of every coming for business personnel; monitoring means of transportation needs may clearly see the license plate number of the vehicle by each lane. In order to meet these special needs pinhole camera, take the traditional non-high-definition monitor, often require a teller a lane alone device cameras, in order to narrow the monitoring line of sight, to safeguard the clarity of the control objectives.
        Megapixels HD camera applications, a million-pixel high-definition camera to replace more than one non-high-definition camera, and can reach the need to use multiple traditional cameras in order to reach the monitoring results.
        Three-lane way to monitor, if you use the camera SD D1 resolution pattern monitor For a clear license plate information, you need to distinguish the installation of a camera for each lane, 3 cameras ability to complete the entire lane monitoring.
        Million-pixel high-definition camera, a video camera on a three-lane monitoring can be achieved, and to obtain a clear license plate information.
        The HD monitoring plan, the 3-lane only need a high-definition camera control can be achieved.
        Million-pixel high-definition camera emerged no doubt to a large user brought great convenience, but also makes security monitoring quality has been greatly promoted, but also has been the traditional imitate camera acceleration retire to show there is a market. The face of millions of high-definition camera many the upwind wireless pinhole camera, in the practical application if you want to choose the higher pixel cameras monitoring the effect of the greater good? In actual fact, megapixels HD brings picture quality promotion, but also should see their impact on network bandwidth occupied by the additions, as well as storage space requirements to enhance, for example 1080P HD screen, five times the clarity SD D1, screen under D1 resolution transmission, only 1M bandwidth is required to transfer with storage, 1080P HD transmission bit rate up to 6M transmission and storage.
        Thus, when HD monitoring plans to build million-pixel high-definition camera, as appropriate, the input of the transmission and storage, choose the most suitable high-definition camera, is not just the choice of five megapixels, even tens of millions of pixels; or 1.3 million, 2-megapixel camera is the most appropriate choice.