Which scanning technique is exclusively used by analog cameras?

Analog cameras primarily utilize interlaced scanning as it is a method traditionally employed in analog television systems. In interlaced scanning, the image is divided into two fields: one field captures the odd lines of resolution and the other captures the even lines. This approach allows for a smoother display of motion on screens when compared to non-interlaced methods, especially given the technology of older monitors and televisions.

Interlacing helps to reduce the flicker sensation that can occur in displays, as it effectively doubles the perceived frame rate without requiring double the bandwidth. Since analog video signals transmit information in this manner, interlaced scanning is inherent to the way analog cameras process and output visual data, making it the correct choice in this context.

Other scanning techniques such as progressive scanning are more commonly associated with digital video technologies, while field-based and frame-by-frame methods may not directly apply in the same manner to traditional analog systems. Understanding this helps to differentiate the unique scanning technique used specifically by analog cameras.