Good/bad judgment method
We can roughly judge the advantages and disadvantages of IP cameras by the following five points:
1, sharpness test
The clarity of a high-definition camera can be easily determined by an ordinary video image sharpness (line number) test card. This method can directly distinguish the sharpness of an image by the naked eye. In general, HDTV 720P camera test card indicators can clearly distinguish TV lines larger than 800TVL, while poor HD cameras have a lower index, and the image There is jitter or flash.
2, dynamic range test
The gray level data of the high-definition image can be simply determined by the ordinary video image gray scale test card.
3, color reproduction
Determine the degree of color reproduction of a high-definition video image by using a color test card or the naked eye. Generally, a good HD IP camera has a very high degree of reduction, and it can achieve a very realistic reduction effect.
4, signal to noise ratio
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 processing and noise suppression on the screen directly determine the image quality effect. Many low-end cameras can only output more clear images in an ideal state of 100 Lux or more, and adapt to changes in light environment. Poor, strong or low-light environments have no effective means of suppressing noise and cannot guarantee image quality. In this case, the HD image is meaningless. We call it pseudo-HD.
5, image coding compression algorithm
The goodness and poorness of encoding compression algorithms for IP high-definition cameras are also one of the important indicators that directly affect the performance of cameras. Currently, the encoding and compression processing chips for high-definition camera video images on the market are divided into two types: DSP chips and ASIC chips. Both have their advantages and disadvantages. The DSP chip has relatively flexible application functions and a short development cycle. However, the coding efficiency is low and the cost is high. The application of ASIC chips is relatively fixed and the development cycle is long, but the coding efficiency is high, and the cost is low after mass use. No matter what kind of carrier is needed, a good video encoding compression algorithm is needed. A good algorithm can reduce the video stream and storage capacity as much as possible while ensuring the image quality and clarity. Poor IP high-definition cameras often produce mosaics or water ripples under high-volume situations, which directly affect video image quality.
- IP Camera Introduction
- IP Camera's Convenience
- IP Camera Image Compression Method
- Network Camera Introduction
- The Introduction Of The Camera
- Camera Device
- The Main Performance Of The Camera
- How To Identify The Authenticity Of The Camera ...
- The History Of Camera Development
- How To Use The Camera