Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
22 Cards in this Set
- Front
- Back
|
Frames: Silent Movies
|
16 frames per sec.
|
|
|
Frames: Sound Movies
|
24 frames per sec.
|
|
|
Frames: National Television System Committee
|
30 frames per sec.
|
|
|
Analog Video
|
Each frame is composed of 525 lines going left to right, top to bottom.
|
|
|
Digital Video
|
Frames are composed of pixels. width x height (720 x 480)
|
|
|
Interlacing
|
Odd-numbered lines scan, then even numbered.
|
|
|
Progressive scanning
|
Both fields scan in correct numerical order. Very sharp picture.
Used on computer monitors. Replacing interlacing. |
|
|
Pixels
|
Short for "picture element".
Smallest unit of video info. Each pixel is made of a red, blue, and green dot. |
|
|
Popular systems
|
480p (progressive scanning)
720p 1080i (interlaced) 1080p |
|
|
Bit Depth
|
The number of bits assigned to each pixel.
Represents the number of colors each image can have. The higher the pixel depth, the greater the number of colors available. |
|
|
8-bit pixel depth
|
256 different colors.
|
|
|
Image Size (resolution)
|
Measured in pixels.
|
|
|
Scaling
|
Keeps same picture, makes it smaller or larger.
|
|
|
Cropping
|
Modifies picture - cuts off parts.
|
|
|
Screen Size / Resolution
|
Represents number of pixels a computer can display.
|
|
|
LCD
|
Lowest Common Denominator
640 x 480 |
|
|
High Definition
|
1920 x 1080
|
|
|
Disadvantages of Analog
|
Must amplify and reamplify continuously.
Creates "noise". - hiss in audio - snow in video |
|
|
Advantages of Digital
|
Strings of 1s and 0s can be reproduced accurately.
"Sample" analog signal. |
|
|
Lossless Compression
|
Shrinking without losing any info.
|
|
|
Lossy compression
|
Shrinking with some loss of info.
|
|
|
Interframe Compression
|
Designed specifically for moving video.
Looks at adjacent frames to see which pixels are the same. Specifies a key frame. |
