omnicam 0.3.3

A Python package for camera utilities

omnicam

A small, unified API for reading frames from USB cameras, IP streams, video files, screen capture, and Raspberry Pi cameras.

Features

• Unified BaseCamera interface across backends
• OpenCV-based capture for USB webcams, video files, RTSP/HTTP streams, and GStreamer pipelines
• Optional Raspberry Pi Camera support (Picamera2)
• Optional screen capture via mss

Installation

pip install omnicam

Optional extras:

pip install omnicam[opencv]
pip install omnicam[screen]
pip install omnicam[pi]

Quickstart

from omnicam import SimpleCamera

with SimpleCamera(index=0) as cam:
    frame = cam.read()
    if frame is not None:
        print(frame.shape)

Camera types

from omnicam import FileCapture, InternetCapture, ScreenCapture

# Video file
cam = FileCapture("/path/to/video.mp4")

# IP camera or MJPEG stream
cam = InternetCapture("http://192.168.1.10:8080/video")

# Screen capture (requires omnicam[screen])
cam = ScreenCapture(index=1)

Raspberry Pi camera

from omnicam import PiCamera

cam = PiCamera(info="IMX219", resolution="720p")

GStreamer and Gazebo

from omnicam import GStreamerCapture, GazeboCamera

pipeline = (
    GStreamerCapture.GstPipeline()
    .add("v4l2src", device="/dev/video0")
    .add("videoconvert")
    .add("appsink")
)
cam = GStreamerCapture(pipeline)

# Gazebo (requires gz tools available on PATH)
cam = GazeboCamera(topic_name="my_camera")

BaseCamera geometry helper

All cameras implement project_pixel_to_ground for projecting a pixel to ground coordinates.

Usage example:

from omnicam import SimpleCamera

with SimpleCamera(index=0) as cam:
    north_m, east_m = cam.project_pixel_to_ground(
        px=640,
        py=360,
        alt_m=120.0,
        roll=0.0,
        pitch=0.0,
        yaw=0.0,
    )
    print(north_m, east_m)

Notes:

• roll, pitch, yaw, and alt_m are for the body frame the camera is attached to.
• The camera's offset and offset rotation are applied when projecting:
  • offset: [x_right, y_down, z_forward] in meters (optical frame)
  • offset_roll, offset_pitch, offset_yaw: radians

Parameters:

• px, py: Pixel coordinates in the image.
• alt_m: Camera altitude in meters.
• roll, pitch, yaw: Camera attitude in radians.

Returns:

• (north_m, east_m): Ground offset in meters relative to the camera.

CameraInfo (advanced)

CameraInfo describes physical camera parameters and enables focal-length math and focus validation. It is optional but useful when you need real-world camera intrinsics.

Fields:

• name: Full model name.
• short_names: Short identifiers (sensor/model code).
• focal_length_mm: (fx_mm, fy_mm) in millimeters.
• pixel_size_um: Pixel size in micrometers.
• max_resolution: (width, height) at sensor maximum.
• aperture_f: F-number (e.g., 2.0).
• hfov_deg: Horizontal field of view in degrees.
• focus_type: "Fixed" | "Autofocus" | "Manual" | "Unknown".
• has_ir_filter: True if the camera has an IR filter.

Usage example:

from omnicam import SimpleCamera
from omnicam.base_camera import CameraInfo

info = CameraInfo(
    name="My Camera Model",
    short_name="MYCAM",
    focal_length_px=(4.0, 4.0),
    pixel_size_um=1.4,
    max_resolution=(1920, 1080),
    aperture_f=2.0,
    hfov_deg=70.0,
    focus_type="Manual",
    has_ir_filter=True,
)

with SimpleCamera(index=0, info=info) as cam:
    fx, fy = cam.focal_length  # focal length in pixels at current size

If you only know focal length in pixel units, use:

from omnicam.base_camera import CameraInfo

info = CameraInfo(
    name="Synthetic",
    short_name="SYN",
    aperture_f=1.0,
    focal_length_px=(800.0, 800.0),
    max_resolution=(1280, 720),
    update_rate=60.0
)

Default Raspberry Pi cameras (short name → full name):

• OV5647, 1 → Camera Module 1
• OV5647 NoIR, 1N → Camera Module 1 NoIR
• IMX219, 2 → Camera Module 2
• IMX219 NoIR, 2N → Camera Module 2 NoIR
• IMX708 Standard, 3 → Camera Module 3 - Standard
• IMX708 NoIR, 3N → Camera Module 3 - Standard NoIR
• IMX708 Wide, 3W → Camera Module 3 - Wide
• IMX708 Wide NoIR, 3WN → Camera Module 3 - Wide NoIR
• IMX477 6mm, HQ6 → High Quality Camera w/ 6mm Lens
• IMX477 16mm, HQ16 → High Quality Camera w/ 16mm Lens
• IMX477 35mm, HQ35 → High Quality Camera w/ 35mm Lens
• IMX477 M12-8mm, HQ8 → High Quality Camera w/ 8mm M12 Lens
• IMX477 M12-25mm, HQ25 → High Quality Camera w/ 25mm M12 Lens
• IMX477 M12-Fish, HQ2.7 → High Quality Camera w/ 2.7mm M12 Fisheye
• IMX296 6mm, HQ6 → Global Shutter Camera w/ 6mm Lens
• IMX296 16mm, HQ16 → Global Shutter Camera w/ 16mm Lens
• IMX500, PiAI → Raspberry Pi AI Camera

Notes

• numpy is required. OpenCV-based backends need omnicam[opencv].
• GStreamer and Gazebo features rely on system-level tooling.

License

MIT. See LICENSE.