Everyone knows that the most important part in the surveillance network camera is the photosensitive device. The more common photosensitive devices on the market are CCD (Charge-coupled Device) and CMOS (Complementary Metal Oxide Semiconductor). At present, CCD is most widely used in analog cameras and standard network cameras.
However, with the advent of millions of high-definition network cameras, it adopts a high-resolution progressive scan method, which is more advantageous than the CCD interlaced scanning method, because the progressive scan method is to scan each TV line in turn, and interlacing scans will be TV lines are divided into odd and even lines and then stacked into a complete image.
For this reason, with the interlaced scanning method, there are differences in the positions of fast-moving objects in the odd-numbered field scans and the even-numbered field scans, which may cause the screen to be blurred. For some applications that require dynamic monitoring, such as traffic areas, that require clearer, non-aliased moving vehicle images, the use of CMOS contrast CCDs is more advantageous because CMOS is slightly superior in pixel density.
In the current surveillance market, the use of CCDs in the military field is relatively high; in the civilian field, CCDs and CMOSs ​​are difficult to separate. The competition focuses on the three aspects of the production process, power consumption, integration, and cost. CMOS solid-state imaging devices and 90% of semiconductor devices use the same standard chip manufacturing technology, while CCD requires a special manufacturing process, so the cost of CCD production will be much higher than CMOS. However, with the development of CMOS technology, the technology that was only adopted on the CCD is being applied to CMOS.
CCD is characterized by high sensitivity, but the corresponding speed is lower; CMOS pixel density is high, there are advantages in the cost and power consumption, but the noise in the low illumination environment is more, this point is worse than the CCD.
The following is a comparison of CCD and CMOS performance.
However, with the advent of millions of high-definition network cameras, it adopts a high-resolution progressive scan method, which is more advantageous than the CCD interlaced scanning method, because the progressive scan method is to scan each TV line in turn, and interlacing scans will be TV lines are divided into odd and even lines and then stacked into a complete image.
For this reason, with the interlaced scanning method, there are differences in the positions of fast-moving objects in the odd-numbered field scans and the even-numbered field scans, which may cause the screen to be blurred. For some applications that require dynamic monitoring, such as traffic areas, that require clearer, non-aliased moving vehicle images, the use of CMOS contrast CCDs is more advantageous because CMOS is slightly superior in pixel density.
In the current surveillance market, the use of CCDs in the military field is relatively high; in the civilian field, CCDs and CMOSs ​​are difficult to separate. The competition focuses on the three aspects of the production process, power consumption, integration, and cost. CMOS solid-state imaging devices and 90% of semiconductor devices use the same standard chip manufacturing technology, while CCD requires a special manufacturing process, so the cost of CCD production will be much higher than CMOS. However, with the development of CMOS technology, the technology that was only adopted on the CCD is being applied to CMOS.
CCD is characterized by high sensitivity, but the corresponding speed is lower; CMOS pixel density is high, there are advantages in the cost and power consumption, but the noise in the low illumination environment is more, this point is worse than the CCD.
The following is a comparison of CCD and CMOS performance.
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