Objectives: Cameras and optics
- Demonstrate an understanding of (and how they interact with each other)
- Depth of field
- Exposure time
- Shutter speed
- Frame rate
- Aperture
- F-stop
- Demonstrate an understanding of how video information is stored on miniDv tapes
- Demonstrate how to adjust the above characteristics on typical digital video cameras
Photogrammetry
- Field of View
- Exposure Time
- Frame Rate
- Focus
- Depth of Field
- Aperture
- f-stop
- Focal Length
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| Standard Photographic Apertures, Exposure Times, and Film Speeds |
| APEX value |
0 |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
| Aperture (f-stop) |
1 |
1.4 |
2 |
2.8 |
4 |
5.6 |
8 |
11 |
16 |
22 |
32 |
| Exposure time (s) |
1 |
1/2 |
1/4 |
1/8 |
1/15 |
1/30 |
1/60 |
1/125 |
1/250 |
1/500 |
1/1000 |
| Film Speed (ISO or ASA) |
3 |
6 |
12 |
25 |
50 |
100 |
200 |
400 |
800 |
1600 |
3200 |
| APEX stands for the Additive Photographic Exposure System. Each increase in APEX value indicates a decrease in the light level by one-half.
Each faster film speed requires half the amount of light that the previous speed needed for proper exposure.
|
Binary Data
00000000 = 0 00000001 = 1 00000010 = 2 00000011 = 3 00000100 = 4 00000101 = 5
11111111 = 255
-Photoshop Example of RGB data
MiniDV
- Data rate of 25Mbps = 3.125MB/s
- 1 frame of video = 720 x 480 = 345,600 pixels
- 30 frames of video per second
- 60 fields of video per second
- This would be 345,600 pixels (8 bytes x 3 colors) x 30 frames = 248Mbps
How does that much information fit when only the data rate is only 25Mbps?
Helical Scanning
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