What is the principle of camera switching day and night (that is, color to black and white)?

Under certain light source conditions, the image changes from color to black and white through circuit switching. In the technical evolution of color/black-and-white line conversion, two sensors (1 color and 1 black-and-white) were used in the early stage to switch with a set of circuits.

This camera adopts a single CCD (color) design, which is a color camera during the day or when the light source is sufficient, and when the light source is insufficient at night (generally in 1LUX? 3LUX) means using digital circuits to eliminate color signals and turn them into black and white images. Although this method can achieve the goal of "low illumination" at night, it has the disadvantages of blurred images and unnatural colors during the day.

Extended data:

technical parameter

Product name, full-color day and night camera

Sensor, 1/3 "Sony Super Hadii CCD"

Pal: 752 (h) x 582 (v)/ntsc: 768 (h) x 494 (v), scanning mode.

Interlaced and synchronous mode

Internal synchronization, horizontal and vertical frequency

Pal:15.625khz, 50.00hz/ntsc:15.734khz, 59.94hz.

Transparency, color 520 line

video output

1.0VP-P/75ω composite video signal

Signal Noise Ratio (SNR)

More than 50dB (when automatic gain is turned off)