Bought in 2023.
The $200 CV camera is a global shutter camera with an advertized 40° diagonal field of view (FOV) 8mm rectilinear lens (smallest FOV available).
Product webpage: https://hupuu.com/camera/1080p-2mp-global-shutter-color-usb-camera-module-yuy2-usb2.0-100fps-mjpeg?sku=UCB543-GS-L8N
UCB543-GS-L8N
Specifications:
Resolution: WUXGA (1920px x 1200px)
Maximum frame rate: 100FPS (5FPS typical)
Exposure: Automatic or manual
Default is automatic and is very aggressive in reducing exposure (images appear dark)
Lens: 8mm rectilinear
Connector: USB-A, USB 2.0 plug and play
Additional specifications found on manufacturer webpage.
Decision for purchase: 2022-2023 Camera Decision Matrix
Plug the camera into a USB port of a computer.
The camera shows up as a camera device.
Windows: Shows up as a camera in Device Manager
Linux: Run the following command to see camera devices
v4l2-ctl --list-devices
Test the camera with Python (e.g. https://docs.opencv.org/4.7.0/dd/d43/tutorial_py_video_display.html ), an application on the computer, or a webcam testing website.
The focus distance can be changed by rotating the lens along the threads of the lens holder.
For 8mm lens ordered with sensor:
Horizontal FOV: ~37.178° = ~0.64889rad
Vertical FOV: ~23.742° = ~0.41438rad
Exact measurements below.
Note: There is some distortion in the lens (i.e. straight lines in the world appear slightly curved outwards).
Print and place square grid paper on flat surface.
A grid on an electronic screen works as well.
Measure ratio of square side length to SI unit.
23squares : 13cm
Plug the camera into computer and display the video.
Point the camera perpendicularly to the grid and ensure that grid is aligned with the edges of the video frame.
Change the distance of the camera from the grid so that there is a whole number of squares from left edge to right edge of video frame. Record the count.
18squares width
Without moving the camera, measure the perpendicular distance from the grid to the closest end of the camera lens.
15cm to end of lens
Estimate the focal point of the lens.
2.5mm lens end length, focal point estimated halfway
Calculate the horizontal field of view:
Convert the horizontal distance to SI units:
Horizontal distance in SI = Square count * (Square side length in SI units / Square side length in squares)
Convert perpendicular distance to the same units as the horizontal distance
Triangle ratio:
Opposite over adjacent = Horizontal distance / 2 / Perpendicular distance
Get the angle:
Angle = arctan(Opposite over adjacent)
Final answer:
Horizontal field of view = Angle * 2
Calculate the vertical field of view:
Follow steps 1-3 of horizontal field of view
Multiply by ratio correction:
Correction = Vertical resolution / Horizontal resolution
Follow steps 4-5 of horizontal field of view
Combined:
~37.178° = ~0.64889rad = arctan(18 * (13 / 23) / 2 / 15.125) * 2 ~23.742° = ~0.41438rad = arctan(18 * (13 / 23) / 2 / 15.125 * (10 / 16)) * 2 |
Input voltage: 5VDC
Power: 160mA (800 mW )
Default cable: 48 grams
Camera and lens: 8 grams
Translation:
Through hole diameter 2.3mm (measured 2.5mm )
Pad diameter 3.5mm
There is ~8.2mm from board to top of wire connector when the camera is plugged in (does not include wire attached to the connector). This can be reduced by removing the connector and soldering the wires directly to the board.
1 port on board opposite of lens direction. Wire continues in port direction (no bends or turns).
No operating constraints. Does not require active cooling.
The lens holder is fixed focus adjustable S-mount (M12).
