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6.2.
Camera
’
s Functions
6.2.1.
Shutter Speed
The exposure time (electronic shutter speed) of the camera can be set in 1-line time units.
The exposure time can be calculated by the following formula:
Exposure time = 1 line time * the setting value of the shutter speed + 13.73 [
μ
sec]
(Setting Range: 1
～
32767)
The formula for calculating the 1-line time differs depending on the mode.
When outputting all pixels (2448 x 2048), it follows:
Exposure time = 58.83 [
μ
sec] * the setting value of the shutter speed + 13.73 [
μ
sec]
1 line time = 58.83 [
μ
sec]
Exposure time (min) = 58.83 [
μ
sec] * 1 + 13.73 [
μ
sec] = 72.56 [
μ
sec]
Exposure time (max) = 58.83 [
μ
sec] * 32767 + 13.73 [
μ
sec] = 1927696.3 [
μ
sec]
≒
1.93 [sec]
When setting to ROI mode, it follows:
1 line time = 1 line time = ((Effective horizontal 464) * 1.5 * 724.4/996) * 1000/54 [nsec]
= (Horizontal effective pixel count + 464) * 20.2 [nsec]
When setting to thinning-out (sub-sampling) mode, it follows:
1 line time = (((2464 + 464) * 1.5/2.0) * 724.4/996) * 1000/54 [nsec] = 29.58 [
μ
sec]
Exposure time (min) = 29.58 [
μ
sec] * 1 + 13.73 [
μ
sec] = 43.31 [
μ
sec]
Exposure time (max) = 29.58 [
μ
sec] * 32767 + 13.73 [
μ
sec] = 969.26 [msec]
※
If ROI or thinning setting is changed, the light time will change and the image brightness will change.
If you are using SDK, you can use the Set/GetRealExposure function to set/get the exposure time in 1
μ
sec units.
※
If the frame rate does not improve despite to ROI or thinning-out transfer mode,
The exposure time setting value may be larger than effective vertical pixels.
In that case, please set exposure time to < effective vertical pixels.
