About the zebra display of the camera?

The "zebra pattern" appearing on the camera is professionally described as "moire pattern". When the pixel spatial frequency of photographic equipment is close to the spatial frequency value of fringes in the shooting picture, moire fringes will appear in the picture.

It is a visual phenomenon, and it is an interference fringe that appears on an object at a certain interval. In actual shooting, like the picture next to it, rainbow stripes appear at intervals between objects, which is the so-called moire phenomenon. For example, on a sunny day, the same is true of the phenomenon that light reflection produces water-like stripes on mosquito nets or curtains.

Extended data:

Camera structure:

① Camera tube and electron beam device are divided into image analysis tube, photomultiplier tube, super-positive image analysis tube and photoconductive camera tube. Miniature lead oxide photoelectric camera tube is often used in new cameras.

All kinds of camera tubes have a vacuum glass shell with a target surface and an electron gun inside. The shot scene is imaged on the target surface through the window on the glass shell. By using the photoelectric emission effect or photoconductive effect of the target surface, the illumination distribution of each point on the target surface is converted into the corresponding potential distribution, and the light image is turned into an electric image. Driven by the deflection coil outside the tube, the electron beam scans the target surface point by point and line by line, and outputs the potential signals of each pixel on the scanning path in turn.

② Solid-state imaging devices. A new type of charge coupled device. Hundreds of thousands of device units are arranged in an array, and the surface layer has photosensitive characteristics. The shot scene is imaged on the front, and the amount of charge stored in each unit is proportional to the illumination. By using the clock pulse and shift control signal, the signals of the previous units are shifted out in a certain order, and the image electrical signal whose intensity changes with time can be obtained.

References:

Baidu encyclopedia-zebra pattern