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Identify True And False HD Cameras
- Jul 10, 2018 -

In general, civilian-grade surveillance cameras use 420 lines, 480 lines, 520 lines, etc. to represent the clarity of the camera, that is, the number of lines scanned horizontally on the monitor. The pixels in the merchant's mouth are often exaggerated, so choose a surveillance camera not to be measured by pixels.

According to the explanation of the professionals, the usual surveillance cameras have only two levels, with a low solution of about 330 lines and a high resolution of about 480 lines. The 420 lines marked by many domestic enterprises are actually 330 line products. In the past, people generally referred to a 480-line camera as a high-definition camera. With the improvement of production technology, the DSP high-pass filter with a processing capacity of 7MH makes the horizontal resolution reach about 520 lines, so further HD surveillance camera products emerged. But in essence, it is just a limit improvement of analog surveillance cameras based on existing DSP and manufacturing technology, which has increased the traditional 480-line HD standard to 520 lines or 540 lines. The actual camera image clarity performance, in addition to the CCD technical indicators used, the back-end signal processing technology such as hook circuit, contrast, color reproduction, signal-to-noise ratio, selected lens, accurate focus and other factors can affect The clarity of the image.