How to distinguish high-quality surveillance cameras through performance indicators

For people working in the field of security monitoring, no matter who, I am afraid that when entering the industry all have experience of data dazzled by a bunch of confused confused, in the end, what kind of video surveillance systems is considered a good monitoring the camera? imaging what standard to be able to meet our shooting needs?, or what kind of lens to be able to ensure better image quality? Maybe this is troubled by a security professional new problem here by surveillance cameras performance indicators, to some of the features of a detailed understanding of surveillance cameras to help security people are better able to determine the characteristics of a camera.

    Pixel values

    Pixel minute photosensitive material is mounted on the imaging device, the more pixels, the higher the image resolution, the more clear. Therefore, the number of pixels is one of the main indicators to measure camera image quality. Network camera works with the camera has dynamic pixel and static pixel "distinguish between the two, so, hundreds of millions or even tens of millions of pixels camera configuration is different, under normal circumstances The ordinary camera pixel count of 40W has been able to meet the basic demand of shooting. HD camera, 200W pixels can meet the needs of special circumstances of the shooting.

    Horizontal resolution

    The horizontal resolution is a measure of the standard of image sharpness, usually with the number of lines (ie TV line, TVL). A TV line interlaced pixels 1.33. Surveillance cameras, the pixel values ​​and horizontal resolution are key indicators to measure the clarity of the screen. Under normal circumstances, only the level of clarity of indicators over 1080i (200 million pixels) and 720p (92 million pixels), before known as high-definition imaging.

    Minimum illumination

    Minimum illumination is also known as sensitivity, it is a way of measuring the camera´s light sensitivity. Straightforward to say, the video surveillance system can be seen in the conditions of many black image, the imaging results with the lens aperture size. In fact, the most illumination representation Let good judgment. For example, when we use the F1.2 lens, shooting ambient light brightness lowest to 0.04lx camera video output signal amplitude of 50% of the maximum amplitude is reached 350mV, this camera´s minimum illumination for 0.04lx/F1.2. Under normal circumstances, the the lowest illumination less than 0.lx/F1.2 camera can be referred to as a camera with low-light capabilities.

    Camera target surface

    Imaging the target surface is also known as the scanning area, that is, the size of the imaging device. The size of the target surface are represented inches, i.e., the image sensor to the diagonal length. Today, the camera target surface has gradually progress from 1/2 inch to 1/4 inch. Theoretically speaking, the smaller the size of the target surface, the higher the content, but the ratio with the target surface of 1/4 inch, 1/2 inch, more amount of light through the 1/4 inch devices have greater depth of field, so the specific pros and cons according to the shooting environment.