davidplowman
commented
10 months ago Hi, thanks for the question. I think maybe we should start with a cut down example so that we can concentrate on the configuration and see what it does.
import time
import libcamera
from picamera2 import Picamera2, Preview
cam = Picamera2()
main = {'size': (640, 360)}
raw = {'size': (2304, 1296)}
preview_controls = {'FrameRate': 15}
preview_config = cam.create_preview_configuration(main, raw=raw, controls=preview_controls)
capture_controls = {'FrameRate': (2, 20)}
capture_config = cam.create_still_configuration(controls=capture_controls)
cam.configure(preview_config)
cam.set_controls({'AeExposureMode': libcamera.controls.AeExposureModeEnum.Long})
cam.start_preview(Preview.QTGL, width=640, height=360)
cam.start()
time.sleep(1)
cam.switch_mode_and_capture_file(capture_config, "test.jpg")There are a few differences here:
- I haven't used the
start_and_capture_filesAPI. It's there for folks who want to type one line and get pictures (see section 6.6.2 of the manual) and not so good for people who want to take more control of what's happening. - In defining the preview config, I've selected a full field of view sensor mode. From your code I thought perhaps this was a problem?
- I've set the framerate of the preview down to 15fps, and for the capture I've allowed it to be anywhere from 2fps to 20fps. This should allow you to get longer exposures. Notice how I've associated the framerate with the camera configuration.
- I've set "long exposure" mode also to maximise the exposure times. (Control settings are "sticky" if you don't change them, so this setting will stay.)
Maybe see how these pictures look. Check with something like exiftool (sudo apt install exiftool if you don't have it) what the shutter time and ISO of the saved image is.
Carl0sC0elh0
Hello everyone,
I'm trying to capture images to do real-time object counting. Everything works except for a small thing, the ROI is illuminated by a lamp with a small refresh rate so when the camera takes a shot there is all that dark noise from the lamp. I'm trying to reduce the refresh rate of the camera so that i can take care of that problem but i can't seem to do it.
This is a sample of the code, please have in mind im trying to work it out so it may have some unnecessary lines:
from picamera2 import Picamera2 from libcamera import controls import time import os
Cam = Picamera2()
os.system("v4l2-ctl --set-ctrl wide_dynamic_range=1 -d /dev/v4l-subdev0") Cam.still_configuration.size=(640, 480)
camera_config = Cam.create_still_configuration({"size": (640, 480)})
Cam.configure() Cam.set_controls({"FrameRate": 15}) Cam.set_controls({"AfMode": controls.AfModeEnum.Continuous}) Cam.start(show_preview = True)
size = Cam.capture_metadata()['ScalerCrop'][2:] full_res = Cam.camera_properties['PixelArraySize']
size = [int(s * 1.5) for s in size] offset = [(r - s) // 2 for r, s in zip(full_res, size)] Cam.set_controls({"ScalerCrop": offset + size}) input('Enter para tirar fotos')
Cam.start_and_capture_files("Foto{0:03}.jpg", initial_delay = 3, capture_mode = "still", num_files = 20, delay = 2)
os.system("v4l2-ctl --set-ctrl wide_dynamic_range=0 -d /dev/v4l-subdev0")
Anyone with a solution for this? Thanks in advance