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Determining Camera Mounting Height - No more than 20% slope to eyes in the face
The first step is to determine an average “face-height”. This value is application-specific, (ie: an environment with
young children will require a lower value). For this example, we will assume an average face height of 5 feet.
The second step is to measure the “subject distance” (from lens to subject), and mounting height for the camera.
In order to maintain a vertical slope of 20%, the camera can be mounted approximately .2 feet above face height
for every foot of subject distance.
(based on average face height of 5’ and a maximum vertical slope of 20%)
D: Distance to Subject:
10’
15’
20’
25’
30’
.
2 * D (20% of Distance to Subject)
2’
3’
4’
5’
6’
E: Eye Height
5’
5’
5’
5’
5’
H: Max. Mounting Height:
7’
8’
9’
10’
11’
S
imple Formula:
Multiply the subject distance value by .2 (for 20% slope). Add the result to the eye height.
This equals the maximum mounting height.
(.2 * D) + E = H
(example: assuming a 5’ eye height and 15 foot subject distance:
15’ (subject distance) x .2 =3’. 3’ + 5’ (eye height) = 8’ mounting height
Remember, a 20% slope is a maximum number – a decreased slope will provide better results, (and mounting
the camera with no slope, exactly at the average face height will provide the best results).
5’
3’
8’ mounting
height
15’ distance
subject to camera
camera
3’/15’ = 20% slope
Maximum Camera Mounting Height - no more than 20% slope above eye height
Содержание P-Series SmartRecorder
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