Planning Tools Optics

The question of whether a video image is usable or not depends on the purpose of the system. This may range from the ability to simply perceive a change in the frame right up to the reliable identification of a person that would stand up in a court of law. As specified in the DIN EN 62676-4 standard, there are currently six different levels of quality for video surveillance. "Inspect" is the level with the highest demands on image quality, whereas "Monitor" is the one with the lowest.

 

 

 

DIN EN EN 62676-4

Monitor

Detect

Observe

Recognize

Identifiy

Inspect

Millimeters per pixel (scene width)

80

40

16

8

4

1

Pixels per 16 cm (face)

2

4

10

20

40

160
MOBOTIX Testchart (PDF, 449.15 KB)
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These parameters can be used to determine the maximum distance between camera and surveillance area (location), the minimum resolution to match the camera location, and the most suitable camera lens for optimal coverage of the surveillance area.

The table shows the maximum distances and image widths (camera ↔ surveillance area) for the different quality levels and resolutions. Please select a lens, an image sensor and another unit if necessary.

Please select a lens
Up to Mx6
3.6 mm
L20–L23
4.1 mm
L22–L25
6.1 mm
L32–L38
7.9 mm
L43–L51
11.9 mm
L65–L76
23.7 mm
L135–L160
50 mm
L270–L320
MOBOTIX 7
4 mm
5 mm
8 mm
10 mm
18 mm
28 mm
50 mm
Please select an image sensor
Please select a unit
Selected lens: B036 (3.6mm)
(Former name: L20–L23)
Selected image sensor: 6MP
Image angle: horizontally 103°, vertically 77°
Quality Levels
Monitor
Detect
Observe
Recognize
Identify
Inspect
Image size Distance
Image width
Distance
Image width
Distance
Image width
Distance
Image width
Distance
Image width
Distance
Image width
CIF
320 x 240
 12,07 m
30,35 m
6,03 m
15,17 m
2,41 m
6,07 m
1,21 m
3,03 m
0,60 m
1,52 m
0,15 m
0,38 m
VGA
640 x 480
 24,14 m
60,69 m
12,07 m
30,35 m
4,83 m
12,14 m
2,41 m
6,07 m
1,21 m
3,03 m
0,30 m
0,76 m
HD
960 x 720
 36,21 m
91,04 m
18,10 m
45,52 m
7,24 m
18,21 m
3,62 m
9,10 m
1,81 m
4,55 m
0,45 m
1,14 m
MEGA
1280 x 960
 48,28 m
121,38 m
24,14 m
60,69 m
9,66 m
24,28 m
4,83 m
12,14 m
2,41 m
6,07 m
0,60 m
1,52 m
QXGA
1920 x 1536
 77,24 m
194,21 m
38,62 m
97,10 m
15,45 m
38,84 m
7,72 m
19,42 m
3,86 m
9,71 m
0,97 m
2,43 m
5MP
2592 x 1944
 97,76 m
245,80 m
48,88 m
122,90 m
19,55 m
49,16 m
9,78 m
24,58 m
4,89 m
12,29 m
1,22 m
3,07 m
6MP
3072 x 2048
 102,99 m
258,95 m
51,49 m
129,47 m
20,60 m
51,79 m
10,30 m
25,89 m
5,15 m
12,95 m
1,29 m
3,24 m

Hemispheric cameras with 180° horizontal image angle (lens B016/L10-L12)

Thanks to its hemispherical 180° lens, a single camera can monitor an entire room right into each of the four corners – and is primarily suited to providing an excellent overview, and less suitable for more exact details. People, for example, may be identified very well at distances of up to 1.5 m, and with sufficient detail at up to 3 m. Objects can be recognized even at distances of 5 m and more from the camera. If you would only like to know if persons enter a room, or to monitor specific objects, rooms of up to 100 m2 floor area can be monitored using a single camera.

The image quality (precision) diminishes as the distance of an object to the camera focus point increases:

  • 1 = very good,
  • 2 = good
  • 3 = satisfactory
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