Interlaced and Progressive Scan Video
One important difference between television and computer monitors lies in how they display frames of video. Television monitors display interlaced video, whereas computer monitors use a progressive scan.
In a progressive scan, the horizontal lines of each frame are displayed from the top of the screen to the bottom in a single pass.
Interlaced video divides each frame into two fields. Each field includes every other horizontal line (scan line) in the frame. A television displays one field first, drawing alternating scan lines from the top of the image to the bottom (Figure 18.6). Returning to the top, it then displays the alternate field, filling in the gaps to complete the frame (Figure 18.7). In NTSC video, ...
Get Premiere 6.5 for Windows and Macintosh: Visual QuickStart Guide now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
