Progressive vs. Interlaced Scan

 

- The Camera - "Progressive vs. Interlaced Scan"

What is progressive and interlaced scan? A progressive scan draws a sequential line that fills a single video frame. It ensures that each frame is filled with a complete image. Interlaced scan, in contrast, displays every other line of an image rather than the whole thing. 



Why does it matter? Interlaced scanning saves bandwidth by cutting down half of a full image. This allowed for older TVs to refresh at a better pace, allowing for smoother transmissions. Interlaced, however, can also cause artifacts which reduce the quality when there is movement on screen compared to progressive scanning. One example of scans being used is during sports broadcasts, in which 720p is used rather than 1080i in order to have better movement in the images.


Why should we know the difference? 
When figuring out progressive vs. interlaced, it is important to notice the difference in the image between the two. Progressive scanning results in smoother, higher quality images with reduced artifacts. Interlaced scanning, on the other hand, may result in artifacts or combing especially when there is movement on the screen, but it is ideal for saving on bandwidth.

Bouncing Ball Experiment

Frame rate is important to understand because it affects how smooth your video may run. Lower frame rate results in less frames being shown per second, whilst high frame rate results in more frames being shown. Higher frame rate is also better used when filming in slow-motion, as more frames are pertained to the slow-motion.


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