In general, the civilian-level surveillance cameras use 420 lines, 480 lines, and 520 lines to represent the resolution of the camera, that is, the number of lines scanned horizontally on the monitor. Pixels in the mouth of a business are often exaggerated, so choose a surveillance camera that does not use pixels as a measure.
According to professional explanations, there are only two levels of typical surveillance cameras, about 330 lines of low resolution and about 480 lines of high resolution. Many of the 420 lines marked by domestic company products are actually 330 line products. In the past, people generally referred to 480-line cameras as high-definition cameras. With the improvement of production technology, the DSP high-pass filter with a processing capacity of 7 MHZ has enabled the horizontal resolution to reach about 520 lines, and thus a further high-definition surveillance camera product has emerged. However, in essence, it is only a limit-based upgrade of the analog surveillance camera based on the existing DSP and manufacturing technology. It has raised the traditional 480-line HD standard to 520 lines or 540 lines. The actual camera image sharpness performance, in addition to the use of CCD technology indicators, the back-end signal processing technology such as the hemming circuit, contrast, color reproduction, signal to noise ratio, the selected lens, focusing accuracy and other factors, can affect The clarity of the image.