Python Expsoure times limited about ic-imaging-control-samples

[TIS-Stefan]

Hello, Please try the code below: Camera.SetPropertySwitch("Exposure","Auto",0) Camera.SetPropertyAbsoluteValue("Exposure","Value",2)  ExposureTime=[0] Camera.GetPropertyAbsoluteValue("Exposure","Value",ExposureTime) print("Exposure time abs: ", ExposureTime[0]) I used that with Python3.6 and it works as expected. The update of the live images is every two seconds. Stefan

[jonasze]

Hi Stefan,

I did but the error persists. I use the following code
`import ctypes as C
import tisgrabber as IC
import cv2
import numpy as np
import matplotlib.pyplot as plt

Camera = IC.TIS_CAM()

Devices = Camera.GetDevices()
for i in range(len( Devices )):
print( str(i) + " : " + str(Devices[i]))

Camera.open("DMK 33UX183 16910441")

Camera.SetVideoFormat('Y16 (5472x3648)')
Camera.SetFormat(IC.SinkFormats.Y16)
Camera.StartLive(0)

Camera.SetPropertySwitch("Exposure","Auto",0)
Camera.SetPropertyAbsoluteValue("Exposure","Value",2)
ExposureTime=[0]
Camera.GetPropertyAbsoluteValue("Exposure","Value",ExposureTime)
print("Exposure time abs: ", ExposureTime[0])

Gainauto=[0]
Camera.GetPropertySwitch("Gain","Auto",Gainauto)

Camera.SetPropertySwitch("Gain","Auto",0)
Camera.SetPropertyValue("Gain","Value",0)

Camera.SnapImage()
image = Camera.GetImageEx()
image = cv2.flip(image,0)
image = cv2.erode(image,np.ones((11, 11)))
image=np.right_shift(image,4)

Camera.StopLive() `

For e.g. exposure value 2 the variable image only contains zeros while for smaller integration times the image is as expected. I tested also small exposure times again and this time they work also for 1/20000.

[TIS-Stefan]

I suppose, the Camera.SnapImage() returns to early or with an image taken to early. Call this twice and see, what happens.

Stefan

[jonasze]

Your are correct and now I implemented a while loop that circumvents the problem:

image=0
while np.max(image)==0:
Camera.SnapImage()
image = Camera.GetImageEx()

[TIS-Stefan]

The reason is the camera provides an image, before the new set exposure time comes in effect. That is the black one you see.