What kind of CCD is the dual-scan CCD in the security camera?

CCD, English full name: charge coupled device, Chinese full name: charge coupled device. It can be called CCD image sensor. CCD is a semiconductor device, which can convert optical images into digital signals. The tiny photosensitive substances implanted on CCD are called pixels. The more pixels a CCD contains, the higher the image resolution it provides. The function of CCD is the same as that of film, but it converts optical signals into charge signals. There are many well-arranged photodiodes on CCD, which can sense light, convert light signals into electrical signals, and convert them into digital image signals through external sampling amplification and analog-to-digital conversion circuits. In addition, CMOS has been developed as a low-cost photosensitive element technology. Common digital products in the market are mainly CCD or CMOS, especially low-end camera products.

So ccd and cmos have nothing to do with scanning, but only refer to the differences in materials and processes.

Interlaced scanning and progressive scanning. Compared with interlaced scanning, progressive scanning is an advanced scanning method, which means that when scanning a display image, it starts from the first line in the upper left corner of the screen and scans the whole image at one time. Therefore, the flicker of the image display screen is small and the display effect is good.

And the double scanning you said should be the D 1 effect on the market. It uses progressive scanning as interlaced scanning, and completes an image with two scans to improve the resolution!