Hi there,
I’m currently working on a project with a Sony XCG-CG510 GigE camera, and I’m trying to change the camera resolution dynamically. However, if I do not completely release the stream, camera object, and buffer(like the code below), I would encounter a write error. I also feel that the method I’m using might not be ideal.
write_register error (access-denied)
Could you please provide some advice on how to handle this more effectively?
Thank you very much for your help.
Best regards,
Below is the code I use to capture the image from a camera twice(640x480 and then 2000x2000)
import sys
import gi
import numpy as np
import cv2
import time
gi.require_version('Aravis', '0.8')
from gi.repository import Aravis
Aravis.enable_interface("Fake")
# Initialize the camera and set pixel format
def initialize_camera(ip_address=None, pixel_format="Mono12Packed"):
camera = Aravis.Camera.new(ip_address) if ip_address else Aravis.Camera.new(None)
# Set pixel format
try:
if pixel_format == "Mono8":
camera.set_pixel_format(Aravis.PIXEL_FORMAT_MONO_8)
elif pixel_format == "Mono12Packed":
camera.set_pixel_format(Aravis.PIXEL_FORMAT_MONO_12_PACKED)
else:
print(f"Unsupported pixel format: {pixel_format}")
exit()
except gi.repository.GLib.GError as e:
print(f"Failed to set pixel format: {e}")
return camera
# Set appropriate resolution
def set_camera_region(camera, width, height):
try:
camera.set_region(0, 0, width, height)
print(f"Region set to: {width}x{height}")
except gi.repository.GLib.GError as e:
print(f"Failed to set region: {e}")
width, height = 640, 480 # Use default conservative value
try:
camera.set_region(0, 0, width, height)
print(f"Fallback: Region set to default: {width}x{height}")
except gi.repository.GLib.GError as e:
print(f"Failed to set default region: {e}")
raise e
return width, height
# Process Mono12Packed image and convert to 8-bit representation
def process_mono12_packed_image(data, width, height):
packed_width = (width * 12) // 8
try:
img_12bit = np.frombuffer(data, dtype=np.uint8).reshape(height, packed_width)
except ValueError as e:
print(f"Error reshaping the buffer: {e}")
exit()
gray16 = np.zeros((height, width), dtype=np.uint16)
gray16[:, 0::2] = (img_12bit[:, 0::3].astype(np.uint16) << 4) | (img_12bit[:, 1::3] & 0x0F).astype(np.uint16)
gray16[:, 1::2] = (img_12bit[:, 2::3].astype(np.uint16) << 4) | ((img_12bit[:, 1::3] >> 4) & 0x0F).astype(np.uint16)
gray16 = np.clip(gray16, 0, 4095)
gray8 = (gray16 >> 4).astype(np.uint8)
return gray8
# Process Mono8 image
def process_mono8_image(data, width, height):
return np.frombuffer(data, dtype=np.uint8).reshape(height, width)
# Clear stream buffers
def clear_stream_buffers(stream):
print("Clearing stream buffers...")
while True:
buffer = stream.try_pop_buffer()
if buffer is None:
break
print("Buffer cleared.")
print("All buffers cleared.")
# Main program
pixel_format = sys.argv[2] if len(sys.argv) > 2 else "Mono12Packed"
ip_address = sys.argv[1] if len(sys.argv) > 1 else None
camera = initialize_camera(ip_address, pixel_format)
# Initial resolution
width, height = set_camera_region(camera, 640, 480)
# Initialize stream object and buffer
stream = camera.create_stream(None, None)
payload = camera.get_payload()
for _ in range(10):
stream.push_buffer(Aravis.Buffer.new_allocate(payload))
print("Start acquisition")
camera.start_acquisition()
while True:
image = stream.pop_buffer()
if image:
data = image.get_data()
if data:
# Process image
if pixel_format == "Mono12Packed":
gray8 = process_mono12_packed_image(data, width, height)
elif pixel_format == "Mono8":
gray8 = process_mono8_image(data, width, height)
# Display image
cv2.imshow("8-bit", gray8)
stream.push_buffer(image)
# Wait for key input
key = cv2.waitKey(1) & 0xFF
if key == ord('q'):
break
else:
print("Warning: No data in buffer.")
# Stop acquisition and release camera object
print("Stop acquisition")
try:
camera.stop_acquisition()
time.sleep(2) # Extend delay to ensure acquisition stops completely
except gi.repository.GLib.GError as e:
print(f"Error stopping acquisition: {e}")
# Clear stream buffers
clear_stream_buffers(stream)
# Delete stream object
del stream
time.sleep(2) # Allow camera to fully release stream resources
cv2.destroyAllWindows()
camera = None # Release camera object
time.sleep(5) # Add extra delay to ensure all resources are released
# Second start
camera = initialize_camera(ip_address, pixel_format)
# Initial resolution
width, height = set_camera_region(camera, 2000, 2000)
# Initialize stream object and buffer
stream = camera.create_stream(None, None)
payload = camera.get_payload()
for _ in range(10):
stream.push_buffer(Aravis.Buffer.new_allocate(payload))
print("Start acquisition")
camera.start_acquisition()
while True:
image = stream.pop_buffer()
if image:
data = image.get_data()
if data:
# Process image
if pixel_format == "Mono12Packed":
gray8 = process_mono12_packed_image(data, width, height)
elif pixel_format == "Mono8":
gray8 = process_mono8_image(data, width, height)
# Display image
cv2.imshow("8-bit", gray8)
stream.push_buffer(image)
# Wait for key input
key = cv2.waitKey(1) & 0xFF
if key == ord('q'):
break
else:
print("Warning: No data in buffer.")
# Stop acquisition and release camera object
print("Stop acquisition")
try:
camera.stop_acquisition()
except gi.repository.GLib.GError as e:
print(f"Error stopping acquisition: {e}")
# Clear stream buffers
clear_stream_buffers(stream)
# Delete stream object
del stream
cv2.destroyAllWindows()
camera = None # Release camera object
