Progressive Scan is a video capturing process during which the sensor progressively scans all the lines of an image. In contrast, the Interlaced Scan first scans all the uneven and then the even lines of an image, which means that the image is subsequently acquired by two separated fields. A true full-frame is not available until after two cycles.
With Progressive Scan though, the full-frame is generated simultaneously, offering the advantage that, especially in the case of moving objects, the picture is free of any interlacing artefacts.
PsF is used to transmit progressively captured images onto media that use interlacing (for example PAL and NTSC monitors). An image captured with Progressive Scan is divided into two segments with identical time signatures (no movements between the segments), which are then transmitted consecutively.
Therefore, progressively captured images can be processed using the same electronic circuits used for storing, processing and transmitting interlaced videos.