Aspect Ratio

Define Aspect Ratio:

-The aspect ratio of an image describes the proportional relationship between its width and its height. It is commonly expressed as two numbers separated by a colon, as in 16:9. For an x:y aspect ratio, no matter how big or small the image is, if the width is divided into x-units of equal length and the height is measured using this same length unit, the height will be measured to be y units.


10" tablet (9.7" display)

4:3

Smartphone (4.7" display)

16:9 (new iPhone 8 uses 18:9)

Leaderboard Ad:

728:90

HDTV:

16:9

Explain the difference between Interlaced & Progressive scanning:

Progressive Video: Video sources that are listed with the letter p are called progressive scan signals. Examples: 480p, 720p or 1080p. Progressive scan video content displays both the even and odd scan lines (the entire video frame) on the TV at the same time. This means you will avoid the problem of motion artifacts.

Interlaced Video: Video sources that are listed with the letter i are called interlaced. An example of this would be 480i or 1080i. Interlaced video displays even and odd scan lines as separate fields. Two of these even and odd scan line fields make up one video frame.

Because you’re only capturing half of the image at a time, movement within the frame (due to either camera movement or subject movement) may cause motion artifacts.