在raspberri上檢測camera的解析度

by Devin Yang

建立於: 5年前 ( 更新: 5年前 )

pi@raspberrypi:~ $ v4l2-ctl --list-formats-ext
ioctl: VIDIOC_ENUM_FMT
	Index       : 0
	Type        : Video Capture
	Pixel Format: 'YUYV'
	Name        : YUYV 4:2:2
		Size: Discrete 320x240
			Interval: Discrete 0.005s (187.000 fps)
			Interval: Discrete 0.007s (150.000 fps)
			Interval: Discrete 0.007s (137.000 fps)
			Interval: Discrete 0.008s (125.000 fps)
			Interval: Discrete 0.010s (100.000 fps)
			Interval: Discrete 0.013s (75.000 fps)
			Interval: Discrete 0.017s (60.000 fps)
			Interval: Discrete 0.020s (50.000 fps)
			Interval: Discrete 0.027s (37.000 fps)
			Interval: Discrete 0.033s (30.000 fps)
		Size: Discrete 640x480
			Interval: Discrete 0.017s (60.000 fps)
			Interval: Discrete 0.020s (50.000 fps)
			Interval: Discrete 0.025s (40.000 fps)
			Interval: Discrete 0.033s (30.000 fps)
			Interval: Discrete 0.067s (15.000 fps)

安裝fswebcam

sudo apt install fswebcam

在非root的帳號，要先給video0硬體權限

sudo usermod -G video ${USER}

抓圖

fswebcam -r 640x480 --no-banner image3.jpg
--- Opening /dev/video0...
Trying source module v4l2...
/dev/video0 opened.
No input was specified, using the first.
--- Capturing frame...
Captured frame in 0.00 seconds.
--- Processing captured image...
Disabling banner.
Writing JPEG image to 'image3.jpg'.

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