Pypylon API to program for "grabbing an image with hardware trigger

[RCC-GIT]

Hello, I have problem to make the hardwre trigger working in a loop . Tigger evry 500ms to every 1 minutes Works OK with Pylonviewer . Working with ace/aca1920-40gc GIEthernet Is it possible to implement a test like

If camera is triggered : Grab image ...

Here is the non working code with time out error on camera.RetrieveResult

The parameter MaxNumBuffer can be used to control the count of buffers

allocated for grabbing. The default value of this parameter is 10.

camera.MaxNumBuffer = 5

set exposure time

#camera.ExposureTimeRaw.SetValue(100)

Select the Frame Start trigger

camera.TriggerSelector.SetValue('FrameStart')

Acquisition mode

#camera.AcquisitionMode.SetValue('SingleFrame') camera.AcquisitionMode.SetValue('Continuous')

Enable triggered image acquisition for the Frame Start trigger

camera.TriggerMode.SetValue('On')

Set the trigger source to Line 1

camera.TriggerSource.SetValue('Line1')

Set the trigger activation mode to rising edge

camera.TriggerActivation.SetValue('RisingEdge')

Set the delay for the frame start trigger to 10 µs

camera.TriggerDelayAbs.SetValue(10.0)

Pixel format

camera.PixelFormat.SetValue('Mono8')

demarrage acquisition

=====================================================

camera.StartGrabbing(pylon.GrabStrategy_OneByOne) converter = pylon.ImageFormatConverter()

convertion openCV BGR format

converter.OutputPixelFormat = pylon.PixelType_BGR8packed converter.OutputBitAlignment = pylon.OutputBitAlignment_MsbAligned count = 1 #camera.TriggerSelector.SetValue('AcquisitionStart') while camera.IsGrabbing():

grabResult = camera.RetrieveResult(5000, pylon.TimeoutHandling_ThrowException)

grabResult = camera.RetrieveResult(5000, pylon.TimeoutHandling_Return)

if grabResult.GrabSucceeded():
    # Access the image data
    image = converter.Convert(grabResult)
    img = image.GetArray()
    cv2.namedWindow('title', cv2.WINDOW_NORMAL)
    cv2.imshow('title', img)
    k = cv2.waitKey(1)
    if k == 27:
        break
    
    grabResult.Release()

Releasing the resource

print("Break") camera.StopGrabbing() camera.Close()

cv2.destroyAllWindows()

[thiesmoeller]

Could you mark your code as code to make it readable

[RCC-GIT]

# The parameter MaxNumBuffer can be used to control the count of buffers
# allocated for grabbing. The default value of this parameter is 10.
camera.MaxNumBuffer = 5

# set exposure time
#camera.ExposureTimeRaw.SetValue(100)

# Select the Frame Start trigger 
camera.TriggerSelector.SetValue('FrameStart')
# Acquisition mode
camera.AcquisitionMode.SetValue('SingleFrame')
# Enable triggered image acquisition for the Frame Start trigger 
camera.TriggerMode.SetValue('On') 
# Set the trigger source to Line 1 
camera.TriggerSource.SetValue('Line1')
# Set the trigger activation mode to rising edge 
camera.TriggerActivation.SetValue('RisingEdge')
# Set the delay for the frame start trigger to 300 µs 
camera.TriggerDelayAbs.SetValue(300.0)
# Pixel format
camera.PixelFormat.SetValue('Mono8')

# demarrage acquisition
# =====================================================
camera.StartGrabbing(pylon.GrabStrategy_LatestImageOnly) 
converter = pylon.ImageFormatConverter()

# convertion openCV BGR format 
converter.OutputPixelFormat = pylon.PixelType_BGR8packed 
converter.OutputBitAlignment = pylon.OutputBitAlignment_MsbAligned

count = 1 
while camera.IsGrabbing(): 
    grabResult = camera.RetrieveResult(5000, pylon.TimeoutHandling_ThrowException)
  #  camera.StartGrabbing(pylon.GrabStrategy_LatestImageOnly) 

    if grabResult.GrabSucceeded():
        # Access the image data
        image = converter.Convert(grabResult)
        img = image.GetArray()
        print("yes, an image is grabbed successfully")

        cv2.imwrite('save_images/%06d.png'%count, img)
        print("image/%06d.png saved"%count)
        count += 1
        k = cv2.waitKey(1)
        if k == 27:
            break
    
    grabResult.Release()

camera.StopGrabbing()
camera.Close()

[thiesmoeller]

camera.AcquisitionMode.SetValue('SingleFrame')

This will stop the camera after one frame. From the viewpoint of the acquisition engine you have to run in continuous mode camera.AcquisitionMode.SetValue('Continuous')

https://docs.baslerweb.com/acquisition-mode.html

... Why do you convert to bgr? PNG supports mono images (http://www.libpng.org/pub/png/book/chapter08.html#png.ch08.div.5.3)

[RCC-GIT]

When I have camera.AcquisitionMode.SetValue('SingleFrame') The result is xxx line 77, in grabResult = camera.RetrieveResult(5000, pylon.TimeoutHandling_ThrowException)

TimeoutException: Grab timed out. The acquisition is not started. In 'SingleFrame' acquisition mode the acquisition has to be started for every frame, see also GrabOne(). : TimeoutException thrown (file 'instantcameraimpl.h', line 1051)

When I have camera.AcquisitionMode.SetValue('Continuous') The result is the same line 78, in grabResult = camera.RetrieveResult(5000, pylon.TimeoutHandling_ThrowException)

File "C:\Users\HRC\Anaconda3\lib\site-packages\pypylon\pylon.py", line 3458, in RetrieveResult return _pylon.InstantCamera_RetrieveResult(self, *args)

TimeoutException: Grab timed out. The acquisition is not started. : TimeoutException thrown (file 'instantcameraimpl.h', line 1056)

The trigger is working for 5000 xxs and I am able to grab an image . Atfer that I have the time out exception

[thiesmoeller]

What do you mean by "5000 xxs"?

[RCC-GIT]

5000ms =5s this is the time windows on which I am able to grab an image If I test at 50000ms =50s I have more time. but I want to able to grab for ever and wait for the trigger at any time .

[thiesmoeller]

In this case best to use the OnImageGrabbed callback as described in the grabusinggrabloopthread.py sample

The background thread waits forever until an image is grabbed and then calls the handler where you can save your image

[RCC-GIT]

Thank you for your answer . I need some clarifications This grabusinggrabloopthread.py is for software trigger and Key action for image event handler

So in line : camera.RegisterConfiguration(pylon.SoftwareTriggerConfiguration(),pylon.RegistrationMode_ReplaceAll, pylon.Cleanup_Delete) pylon.SoftwareTriggerConfiguration() must be replace what ? Same for : camera.StartGrabbing(pylon.GrabStrategy_OneByOne, pylon.GrabLoop_ProvidedByInstantCamera) pylon.GrabStrategy_OneByOne is this correct ?

Also :

while True:
            time.sleep(0.05)
            key = getkey()
            print(key)
            if (key == 't' or key == 'T'):
                # Execute the software trigger. Wait up to 100 ms for the camera to be ready for trigger.
                if camera.WaitForFrameTriggerReady(100, pylon.TimeoutHandling_ThrowException):
                    camera.ExecuteSoftwareTrigger();
            if (key == 'e') or (key == 'E'):
                break

How do I replace Key action t or T by Hardware Trigger action in This While loop ? Maybe this can work as the while loop will get an interruption from the image handler ?

while True:
            time.sleep(0.05)
            key = getkey()
            if (key == 'e') or (key == 'E'):
                break

And I suppose i will grab the image in the OnImageGrabbed subroutine ? Please confirm.

By the end my target is to have one unique trigger and 4 cameras , hope this program will work fo rmore then one camera .

[Charli-py]

Hello, @thiesmoeller I am trying to capture image of a moving object with a line scan camera. But iam getting grabtimeout Error. Can you please help iam new to this application

camera = pylon.InstantCamera(pylon.TlFactory.GetInstance().CreateFirstDevice())

camera.Open()

print("DeviceClass: ", camera.GetDeviceInfo().GetDeviceClass()) print("DeviceFactory: ", camera.GetDeviceInfo().GetDeviceFactory()) print("ModelName: ", camera.GetDeviceInfo().GetModelName())

Hardware_Trigger = False

if Hardware_Trigger:

reset registration

camera.RegisterConfiguration(pylon.ConfigurationEventHandler(), pylon.RegistrationMode_ReplaceAll, pylon.Cleanup_Delete)

The parameter MaxNumBuffer can be used to control the count of buffers

allocated for grabbing. The default value of this parameter is 10.

camera.MaxNumBuffer = 10

set exposure time

camera.ExposureTimeRaw.SetValue(100)

Select the Frame Start trigger

camera.TriggerSelector.SetValue('FrameStart')

Acquisition mode

camera.AcquisitionMode.SetValue('Continuous')

Enable triggered image acquisition for the Frame Start trigger

camera.TriggerMode.SetValue('On')

Set the trigger source to Line 1

camera.TriggerSource.SetValue('Line1')

Set the trigger activation mode to rising edge

camera.TriggerActivation.SetValue('RisingEdge')

Set the delay for the frame start trigger to 300 µs

camera.TriggerDelayAbs.SetValue(10.0)

Pixel format

camera.PixelFormat.SetValue('Mono8')

camera.StartGrabbing(pylon.GrabStrategy_OneByOne) converter = pylon.ImageFormatConverter()

converter.OutputPixelFormat = pylon.PixelType_BGR8packed converter.OutputBitAlignment = pylon.OutputBitAlignment_MsbAligned

count = 1 while camera.IsGrabbing():

camera.StartGrabbing(pylon.GrabStrategy_LatestImageOnly)

grabResult = camera.RetrieveResult(5000, pylon.TimeoutHandling_ThrowException)
    
if grabResult.GrabSucceeded():
# Access the image data
    image = converter.Convert(grabResult)
    img = image.GetArray()
    print("yes, an image is grabbed successfully")

    cv2.imwrite('D:\Print\save_images/%06d.png'%count, img)
    print("image/%06d.png saved"%count)
    count += 1
    k = cv2.waitKey(1)
    
    
grabResult.Release()

camera.StopGrabbing() camera.Close()

[thiesmoeller]

Please edit your post according to https://guides.github.com/features/mastering-markdown/# for code formatting to make it readable.

Can you grab images in pylon viewer in this configuration?

[Charli-py]

Sorry for the late reply. Yes iam able to grab the image in pylon viewer in continuous mode with this configuration

camera = pylon.InstantCamera(pylon.TlFactory.GetInstance().CreateFirstDevice())

camera.Open()

print("DeviceClass: ", camera.GetDeviceInfo().GetDeviceClass()) print("DeviceFactory: ", camera.GetDeviceInfo().GetDeviceFactory()) print("ModelName: ", camera.GetDeviceInfo().GetModelName())

Hardware_Trigger = False

if Hardware_Trigger:

camera.RegisterConfiguration(pylon.ConfigurationEventHandler(), pylon.RegistrationMode_ReplaceAll, pylon.Cleanup_Delete)

camera.MaxNumBuffer = 10

camera.ExposureTimeRaw.SetValue(100)

camera.TriggerSelector.SetValue('FrameStart') camera.AcquisitionMode.SetValue('Continuous')

camera.TriggerMode.SetValue('On')

camera.TriggerSource.SetValue('Line1')

camera.TriggerActivation.SetValue('RisingEdge')

camera.TriggerDelayAbs.SetValue(10.0) camera.PixelFormat.SetValue('Mono8')

camera.StartGrabbing(pylon.GrabStrategy_OneByOne) converter = pylon.ImageFormatConverter()

converter.OutputPixelFormat = pylon.PixelType_BGR8packed converter.OutputBitAlignment = pylon.OutputBitAlignment_MsbAligned

count = 1 while camera.IsGrabbing():

grabResult = camera.RetrieveResult(5000, pylon.TimeoutHandling_ThrowException)
    
if grabResult.GrabSucceeded():

    image = converter.Convert(grabResult)
    img = image.GetArray()
    print("yes, an image is grabbed successfully")

    cv2.imwrite('D:\Print\save_images/%06d.png'%count, img)
    print("image/%06d.png saved"%count)
    count += 1
    k = cv2.waitKey(1)
    
    
grabResult.Release()

camera.StopGrabbing() camera.Close()

[thiesmoeller]

what so you want to achieve? You disabled the path 'hardware trigger' .. the operation that you skipped is correct to reset any default configurations..

In the grab loop you wait for a key press.. why ...

You convert the mono8 image to rgb....png supports mono video data....

And to repeat the question.. can you successfully run the hw triggered usecase in pylon viewer?

[thiesmoeller]

@Charli-py : did you made any progress ?

[simonsauss]

Hello,

I have a basler camera and I'm trying to set triggers with the grabusinggrabloopthread.py script. For example, I would like to record 10 images every 1 second then 50 images every 20 seconds etc... Does anyone know how I could do this? I can't find the commands to do this. For information I have an exposure time of 66 000 us...

Thanks

[ridvanozdemir]

grabResult = camera.RetrieveResult(5000, pylon.TimeoutHandling_ThrowException) how about if I don't want to use any timeout parameter

[burakcanbaz]

@RCC-GIT hello. Did you find an answer to your

How do I replace Key action t or T by Hardware Trigger action in This While loop ? Maybe this can work as the while loop will get an interruption from the image handler ?

question. If you found could you please share your solution ?

[thiesmoeller]

Please check our companion repository https://github.com/basler/pypylon-samples where HW trigger and much more is explained

[gt8mar]

Is there a way to stream video from one camera, then have a waitkey that triggers saving a series of images from one camera and a second HW triggered camera?

I'm imagining setting a key like "r" to mean record. Then stream video without saving until I press "r", at which point it begins saving.

I tried using input() but that stops the loop where I stream the video.

[thiesmoeller]

Hi @gt8mar , Please move your question to a new issue.