Sep 26, 2021 View: 788
You can simply judge the definition of a high-definition camera through a common video image definition (line number) test card. This method can directly distinguish the clarity of the image by the naked eye. Generally speaking, the index of the high-definition 720P camera test card can clearly distinguish TV lines greater than 800TVL, while the index of the poorer high-definition camera will be low, and the image There is jitter or burrs.
The gray level data of high-definition images can be simply judged by ordinary video image gray level test cards.
Judge and compare the color reproduction degree of high-definition video images by color test card or naked eyes. Generally good high-definition IP cameras have a very high degree of restoration, which can almost achieve a very realistic restoration effect.
The suppression of noise in the same picture is also one of the important indicators to measure the performance of high-definition IP cameras. The bright and fast processing of the dark blocks in the picture and the noise suppression directly determine the image quality effect. There are many low-end cameras that can only output clearer pictures under the ideal state of 100 Lux or more, and the ability to adapt to changes in the light environment Very poor, there is no effective means for noise suppression in a strong light or dark light environment, and the image quality cannot be guaranteed. In this case, high-definition images are meaningless, and we call them pseudo-high-definition.
The quality of the image encoding and compression algorithm of IP high-definition cameras is also one of the important indicators that directly affect the performance of the camera. The encoding and compression processing chips for video images of high-definition cameras on the market are divided into two types of carriers: DSP chip and ASIC chip. Each has its own merits, DSP chip function application is relatively flexible, the development cycle is short, but the coding efficiency is low, and the cost is high.
ASIC chip function application is relatively fixed, the development cycle is long, but the coding efficiency is very high, and the cost is low after mass use. No matter what kind of carrier it is, a good video coding compression algorithm is required. A good algorithm can reduce the video stream and storage capacity as much as possible while ensuring image quality and definition. Inferior IP high-definition cameras often produce mosaics or water ripples in the case of a large amount of movement, which directly affects the video image quality.
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