Error when trying to acquire images - Buffer None

[psous32]

Describe the Issue
Hello.
I'm using a DALSA linea C4096-7 camera. I'm trying to acquire images but without success. Below is the code I'm using and the error.

Sample Code

`from genicam.gentl import TimeoutException
import numpy as np
from harvesters.core import Harvester
import cv2
import traceback
import os
import time

def main():
h = Harvester()

try:
    gentl_path = 'C:/Program Files/MATRIX VISION/mvIMPACT Acquire/bin/x64/mvGenTLProducer.cti'
    if os.path.exists(gentl_path):
        print(f"GenTL file found at {gentl_path}")
        h.add_file(gentl_path)
    else:
        print(f"GenTL file not found at {gentl_path}")
        return

    print("Updating device list")
    h.update()

    print(f"Number of devices found: {len(h.device_info_list)}")
    for device in h.device_info_list:
        print(f"Device: {device.vendor} {device.model}")

    if len(h.device_info_list) == 0:
        print("No devices found. Exiting.")
        return

    # Create image acquirer with control privilege
    try:
        ia = h.create_image_acquirer(0, privilege='control')
        print("Image acquirer created successfully")
    except Exception as e:
        print(f"Failed to create image acquirer: {str(e)}")
        return

    # Check the node map
    print("Inspecting node map...")
    node_map = ia.remote_device.node_map

    # Attempt to configure camera settings directly
    try:
        exposure_time_node = node_map.get_node('ExposureTime')
        exposure_time_node.value = 97.439  # Set exposure time
        print(f"ExposureTime set to: {exposure_time_node.value} microseconds")
    except Exception as e:
        print(f"Error setting ExposureTime: {str(e)}")

    try:
        width_node = node_map.get_node('Width')
        width_node.value = 2048  # Set width
        print(f"Width set to: {width_node.value}")
    except Exception as e:
        print(f"Error setting Width: {str(e)}")

    try:
        height_node = node_map.get_node('Height')
        height_node.value = 300  # Set height
        print(f"Height set to: {height_node.value}")
    except Exception as e:
        print(f"Error setting Height: {str(e)}")

    try:
        pixel_format_node = node_map.get_node('PixelFormat')
        pixel_format_node.value = 'Mono8'  # Ensure this is a valid format based on your camera
        print(f"PixelFormat set to: {pixel_format_node.value}")
    except Exception as e:
        print(f"Error setting PixelFormat: {str(e)}")

    try:
        acquisition_mode_node = node_map.get_node('AcquisitionMode')
        acquisition_mode_node.value = 'Continuous'
        print("Acquisition mode set to Continuous.")
    except Exception as e:
        print(f"Error setting AcquisitionMode: {str(e)}")

    try:
        trigger_mode_node = node_map.get_node('TriggerMode')
        trigger_mode_node.value = 'Off'
        print("Trigger mode set to Off.")
    except Exception as e:
        print(f"Error setting TriggerMode: {str(e)}")

    # Starting acquisition
    print("Starting acquisition")
    ia.start()
    print(f"Acquisition status: {ia.is_acquiring()}")

    # Fetch buffers
    for i in range(5):  # Try fetching 5 buffers
        print(f"Fetching buffer {i + 1}")
        try:
            buffer = ia.fetch(timeout=5000)

            if buffer:
                print("Buffer fetched successfully")
                print(f"Buffer info: {buffer}")

                # Check if the buffer payload has components
                if hasattr(buffer.payload, 'components') and buffer.payload.components:
                    component = buffer.payload.components[0]
                    buffer_data = component.data if hasattr(component, 'data') else None

                    if buffer_data is not None:
                        width = width_node.value if width_node else 0
                        height = height_node.value if height_node else 0
                        image_size = width * height

                        # Create a numpy array from the buffer data
                        image_data = np.frombuffer(buffer_data, dtype=np.uint8, count=image_size)

                        # Ensure the buffer size is as expected
                        if image_data.size != image_size:
                            print(f"Unexpected buffer size: expected {image_size}, got {image_data.size}")
                            continue

                        # Reshape the image data
                        image = image_data.reshape((height, width))

                        print(f"Image shape: {image.shape}")
                        print(f"Image dtype: {image.dtype}")

                        # Display and save the image
                        window_name = f'output_image_{i + 1}'
                        cv2.imshow(window_name, image)
                        cv2.imwrite(f'{window_name}.png', image)
                        cv2.waitKey(10)
                    else:
                        print("Component data is None")
                else:
                    print("Buffer payload has no components")

                buffer.queue()  # Requeue the buffer to continue acquisition
            else:
                print("Buffer is None")
        except TimeoutException:
            print(f"Timeout occurred while fetching buffer {i + 1}")
        except Exception as e:
            print(f"An error occurred while fetching buffer {i + 1}: {str(e)}")
            traceback.print_exc()

        time.sleep(1)  # Add a small delay between buffer fetches

except Exception as e:
    print(f"An error occurred: {str(e)}")
    traceback.print_exc()
finally:
    if 'ia' in locals():
        print("Stopping acquisition and destroying image acquirer")
        ia.stop()
        ia.destroy()
    print("Resetting Harvester")
    h.reset()

if name == "main":
main()`

Complete Traceback error:

` GenTL file found at C:/Program Files/MATRIX VISION/mvIMPACT Acquire/bin/x64/mvGenTLProducer.cti

Updating device list

Number of devices found: 1

Device: Teledyne DALSA Linea C4096-7um

D:Testes\3.9\Harvester\tt.py:35: DeprecationWarning: please consider to use create() instead of create_image_acquirer().
ia = h.create_image_acquirer(0, privilege='control')

Image acquirer created successfully

Inspecting node map...

Error setting ExposureTime: Value 997.000000 must be smaller than or equal 97.439000. : OutOfRangeException thrown in node

'ExposureTime' while calling 'ExposureTime.SetValue()' (file 'FloatT.h', line 91)

Width set to: 2048

Height set to: 300

Error setting PixelFormat: Failed to write enumeration value. Enum entry is not writable : AccessException thrown in node

'PixelFormat' while calling 'PixelFormat.FromString()' (file 'Enumeration.cpp', line 139)

Acquisition mode set to Continuous.

Trigger mode set to Off.

Starting acquisition

Acquisition status: True

Fetching buffer 1

An error occurred while fetching buffer 1: GenTL exception: Given handle does not support the operation. (Message from the source: Invalid data stream handle) (ID: -1006)

2024-11-04 22:18:56,106 :: harvesters.core :: ERROR :: GenTL exception: Given handle does not support the operation. (Message from the source: Invalid data stream handle) (ID: -1006)

Traceback (most recent call last):
File "D:\Testes\3.9\Harvester\venv39\lib\site-packages\harvesters\core.py", line 2437, in _fetch
monitor.update_event_data(self.timeout_period_on_update_event_data_call)

File "D:\Testes\3.9\Harvester\venv39\lib\site-packages\genicam\gentl.py", line 1296, in update_event_data
return _gentl.EventManagerNewBuffer_update_event_data(self, timeout)

_gentl.InvalidHandleException: GenTL exception: Given handle does not support the operation. (Message from the source: Invalid data stream handle) (ID: -1006)

Traceback (most recent call last):
File "D:\Testes\3.9\Harvester\tt.py", line 97, in main
buffer = ia.fetch(timeout=5000)

File "D:\Testes\3.9\Harvester\venv39\lib\site-packages\harvesters\core.py", line 2562, in fetch
buffer = self._fetch(monitor=monitor,

File "D:\Testes\3.9\Harvester\venv39\lib\site-packages\harvesters\core.py", line 2437, in _fetch
monitor.update_event_data(self.timeout_period_on_update_event_data_call)

File "D:\Testes\3.9\Harvester\venv39\lib\site-packages\genicam\gentl.py", line 1296, in update_event_data
return _gentl.EventManagerNewBuffer_update_event_data(self, timeout)

_gentl.InvalidHandleException: GenTL exception: Given handle does not support the operation. (Message from the source: Invalid data stream handle) (ID: -1006)

Fetching buffer 2

An error occurred while fetching buffer 2: list index out of range
Traceback (most recent call last):
File "D:\Testes\3.9\Harvester\tt.py", line 97, in main
buffer = ia.fetch(timeout=5000)

File "D:\Testes\3.9\Harvester\venv39\lib\site-packages\harvesters\core.py", line 2568, in fetch
return buffers if len(self._new_buffer_event_monitor_dict.values()) > 1 else buffers[0]

IndexError: list index out of range
Fetching buffer 3
An error occurred while fetching buffer 3: list index out of range
Traceback (most recent call last):
File "D:\Testes\3.9\Harvester\tt.py", line 97, in main
buffer = ia.fetch(timeout=5000)

File "D:\Testes\3.9\Harvester\venv39\lib\site-packages\harvesters\core.py", line 2568, in fetch
return buffers if len(self._new_buffer_event_monitor_dict.values()) > 1 else buffers[0]

IndexError: list index out of range

Fetching buffer 4
An error occurred while fetching buffer 4: list index out of range
Traceback (most recent call last):

File "D:\Testes\3.9\Harvester\tt.py", line 97, in main
buffer = ia.fetch(timeout=5000)
File "D:\Testes\3.9\Harvester\venv39\lib\site-packages\harvesters\core.py", line 2568, in fetch
return buffers if len(self._new_buffer_event_monitor_dict.values()) > 1 else buffers[0]
IndexError: list index out of range

Fetching buffer 5
An error occurred while fetching buffer 5: list index out of range
Traceback (most recent call last):

File "D:\Testes\3.9\Harvester\tt.py", line 97, in main
buffer = ia.fetch(timeout=5000)
File "D:\Testes\3.9\Harvester\venv39\lib\site-packages\harvesters\core.py", line 2568, in fetch
return buffers if len(self._new_buffer_event_monitor_dict.values()) > 1 else buffers[0]
IndexError: list index out of range
Stopping acquisition and destroying image acquirer
Resetting Harvester `

Configuration

• OS: Windowns 10
• Python: 3.9.13
• Harvester: 1.4.3
• GenTL Producer: mvGenTL_Acquire -x86_64-2.50.1
• Camera: DALSA linea C4096-7

[MYCL94]

Hi paulosousa32,

I am not sure if this might be an issue, but I would try to acquire the camera exclusively.

The docs also mention that default is "exclusive"

privilege – Set an access privilege. exclusive, control, and read_only are supported. The default is exclusive.

I mean this is self-explanatory.

Error setting ExposureTime: Value 997.000000 must be smaller than or equal 97.439000. : OutOfRangeException thrown in node

'ExposureTime' while calling 'ExposureTime.SetValue()' (file 'FloatT.h', line 91)

Also I would begin trying with a basic example where you connect and acquire images and check if the buffer is empty.

Last: I am also not sure if PixelFormat can be just set since you might have to set TLParamsLocked first.

Just try a step-by-step approach.

[psous32]

Hello MYCL94,
Thank you for your help, I have corrected the errors. However, do you have a basic example to test what you have just told me?

[psous32]

Hi,
So i make the changes, put the exposure_time_node.value = 97.0, and the triggerMode to on. But wen i try to fetch the buffer they return None.
Any ideas ?

New code

`def main():
h = Harvester()

try:
    gentl_path = 'C:/Program Files/MATRIX VISION/mvIMPACT Acquire/bin/x64/mvGenTLProducer.cti'
    if os.path.exists(gentl_path):
        print(f"GenTL file found at {gentl_path}")
        h.add_file(gentl_path)
    else:
        print(f"GenTL file not found at {gentl_path}")
        return

    print("Updating device list")
    h.update()

    print(f"Number of devices found: {len(h.device_info_list)}")
    for device in h.device_info_list:
        print(f"Device: {device.vendor} {device.model}")

    if len(h.device_info_list) == 0:
        print("No devices found. Exiting.")
        return

    # Manually specify the device using its serial number
    device_info = h.device_info_list[0]  # Assuming you want the first device in the list
    try:
        #ia = h.create_image_acquirer(0, privilege='exclusive')
        ia = h.create(0)
        print("Image acquirer created successfully")
    except Exception as e:
        print(f"Failed to create image acquirer: {str(e)}")
        return

    # Check the node map
    print("Inspecting node map...")
    node_map = ia.remote_device.node_map

    # Attempt to configure camera settings directly
    try:
        exposure_time_node = node_map.get_node('ExposureTime')
        exposure_time_node.value = 97.0  # Set exposure time
        print(f"ExposureTime set to: {exposure_time_node.value} microseconds")
    except Exception as e:
        print(f"Error setting ExposureTime: {str(e)}")

    try:
        width_node = node_map.get_node('Width')
        width_node.value = 2048  # Set width
        print(f"Width set to: {width_node.value}")
    except Exception as e:
        print(f"Error setting Width: {str(e)}")

    try:
        height_node = node_map.get_node('Height')
        height_node.value = 300  # Set height
        print(f"Height set to: {height_node.value}")
    except Exception as e:
        print(f"Error setting Height: {str(e)}")

    try:
        
        ia.remote_device.node_map.AcquisitionMode.value = 'Continuous'
        ia.remote_device.node_map.StreamChannelPacketSize.value = 9000
        print("Acquisition mode set to Continuous.")
    except Exception as e:
        print(f"Error setting AcquisitionMode: {str(e)}")

    try:
        trigger_mode_node = node_map.get_node('TriggerMode')
        trigger_mode_node.value = 'On'
        print("Trigger mode set to On.")
    except Exception as e:
        print(f"Error setting TriggerMode: {str(e)}")

    # Starting acquisition
    print("Starting acquisition")
    ia.start()
    print(f"Acquisition status: {ia.is_acquiring()}")

    # Fetch buffers
    for i in range(3):
        print(f"Fetching buffer {i + 1}")
        try:

            ia.remote_device.node_map.TriggerSoftware.execute()

            buffer = ia.try_fetch(timeout=5)

            print(buffer)

            if buffer:
                print("Buffer fetched successfully")
                print(f"Buffer info: {buffer}")

                # Check if the buffer payload has components
                if hasattr(buffer.payload, 'components') and buffer.payload.components:
                    component = buffer.payload.components[0]
                    buffer_data = component.data if hasattr(component, 'data') else None

                    if buffer_data is not None:
                        width = width_node.value if width_node else 0
                        height = height_node.value if height_node else 0
                        image_size = width * height

                        # Create a numpy array from the buffer data
                        image_data = np.frombuffer(buffer_data, dtype=np.uint8, count=image_size)

                        # Ensure the buffer size is as expected
                        if image_data.size != image_size:
                            print(f"Unexpected buffer size: expected {image_size}, got {image_data.size}")
                            continue

                        # Reshape the image data
                        image = image_data.reshape((height, width))

                        print(f"Image shape: {image.shape}")
                        print(f"Image dtype: {image.dtype}")

                        # Display and save the image
                        window_name = f'output_image_{i + 1}'
                        cv2.imshow(window_name, image)
                        cv2.imwrite(f'{window_name}.png', image)
                        cv2.waitKey(10)
                    else:
                        print("Component data is None")
                else:
                    print("Buffer payload has no components")

                buffer.queue()  # Requeue the buffer to continue acquisition
            else:
                print("Buffer is None")
        except TimeoutException:
            print(f"Timeout occurred while fetching buffer {i + 1}")
        except Exception as e:
            print(f"An error occurred while fetching buffer {i + 1}: {str(e)}")
            traceback.print_exc()

        time.sleep(1)  # Add a small delay between buffer fetches

except Exception as e:
    print(f"An error occurred: {str(e)}")
    traceback.print_exc()
finally:
    if 'ia' in locals():
        print("Stopping acquisition and destroying image acquirer")
        ia.stop()
        ia.destroy()
    print("Resetting Harvester")
    h.reset()

if name == "main":
main()`

Log

GenTL file found at C:/Program Files/MATRIX VISION/mvIMPACT Acquire/bin/x64/mvGenTLProducer.cti
Updating device list
Number of devices found: 1
Device: Teledyne DALSA Linea C4096-7um
Image acquirer created successfully
Inspecting node map...
ExposureTime set to: 97.0 microseconds
Width set to: 2048
Height set to: 300
Error setting AcquisitionMode:
Trigger mode set to On.
Starting acquisition
Acquisition status: True
Fetching buffer 1
None
Buffer is None
Fetching buffer 2
None
Buffer is None
Fetching buffer 3
None
Buffer is None
Stopping acquisition and destroying image acquirer
Resetting Harvester

[MYCL94]

Hi,

I just realized this is a linescan camera and you are trying to acquire an image with "TriggerMode: On", but are you sure that you do have also a valid trigger? Also check if you have set SoftwareTrigger or HardwareTrigger in your nodemap.
Which one do you want to use?

If it is SoftwareTrigger you also need to execute the command for it etc...

If it is HardwareTrigger make sure these settings are set properly. The best is to test the settings you need with Teledyne software.

• Triggerline
• Triggermode
• Triggeractivation

[psous32]

Hi,
I'm using this command
ia.remote_device.node_map.TriggerSoftware.execute()
Or should I use another one?
I have checked the settings via Debug and they are receiving the values trigger_mode_node = On and trigger_sourece_node = Software.

[psous32]

Hello @MYCL94 ,
I already have the right trigger configured, but when I ftech the buffer it keeps returning None.
I've also tried using it in free-run mode and I get the same problem.