What scanning method is known to reduce bandwidth by using two fields of lines?

Interlaced scanning is a method that effectively reduces bandwidth utilization by displaying image data in two passes. In interlaced scanning, only half of the image is drawn in one pass (odd lines), and then the second half (even lines) is drawn in a subsequent pass. This technique minimizes the amount of data transmitted at one time, which is especially beneficial for low-bandwidth settings.

By alternating between the two fields of lines, interlaced scanning can create the illusion of a complete image while transmitting less data overall compared to progressive scanning, where the entire image is redrawn in each pass. This method was particularly common in the era of analog television and is still relevant in specific video applications today.

Progressive scanning, on the other hand, transmits all lines of the image in a single frame, which generally requires more bandwidth. While it offers better visual quality with smoother motion, it doesn’t reduce bandwidth in the same way interlaced scanning does. Laser focus and frame scanning, while related to image capture and processing, do not focus on bandwidth reduction through the specific two-field method utilized in interlaced scanning.