How to detect camera loss signals and skewness

The loss of signal may occur in the following scenarios: The data line is cut off, poor connector contact, etc.

In these cases, opencv will keep the image of the previous frame unchanged. When the signal is normal, even if the scene does not change, there will still be disturbance, so each frame is not static.

Therefore, the idea is to detect the difference between the current frame and the previous frame. If the value is strictly 0 and the number of frames (or a period of time) persists, the signal loss can be determined.

This approach is not very effective for cameras with almost no light, but it can be handled by reducing the differential threshold.

For partial colors, that is, if the R, G, and B values of each frame remain below a certain threshold value while eliminating signal loss, the partial color can be determined.