Which scanning method captures and transmits each frame in two parts?

Interlaced scanning is a technique used in video production where each frame is divided into two fields, with one field capturing the odd lines and the other capturing the even lines. This method was developed to enhance the perceived motion smoothness in video playback by effectively doubling the frame rate without requiring additional bandwidth or data.

The result is that during playback, a viewer sees the full frame as it’s reconstructed from these alternating fields, which helps to reduce flicker and provide an illusion of continuous motion. This method was particularly useful in traditional analog television systems. It allows for efficient use of bandwidth and was designed to accommodate the limitations of early television technology.

In contrast, the other scanning methods involve different processes. Progressive scanning captures every line in each frame sequentially, delivering a complete frame at once. Field scanning is less commonly referenced in modern contexts, and frame rate adjustment deals with modifying the speed of playback rather than altering how images are scanned and displayed. Therefore, understanding interlaced scanning's role highlights its historical significance and practical applications in video technology.