USB摄像头使用 · 荔枝派Zero指南

# USB摄像头使用 ## 内核选项插入USB摄像头，lsusb 可见：（摄像头PID:VID视你插入的USB摄像头型号而定） `Bus 001 Device 003: ID 1908:2311 GEMBIRD` 在dev下可见video0 设备。 ## fswebcam fswebcam可以用来抓取摄像头图片。可以通过apt-get直接安装。 `fswebcam -d /dev/video0 --no-banner -r 320x240 capture.jpg` 抓取一帧图片。 ~~~ root@LicheePi:~# fswebcam --help Usage: fswebcam [<options>] <filename> [[<options>] <filename> ... ] Options: -?, --help Display this help page and exit. -c, --config <filename> Load configuration from file. -q, --quiet Hides all messages except for errors. -v, --verbose Displays extra messages while capturing --version Displays the version and exits. -l, --loop <seconds> Run in loop mode. -b, --background Run in the background. -o, --output <filename> Output the log to a file. -d, --device <name> Sets the source to use. -i, --input <number/name> Selects the input to use. -t, --tuner <number> Selects the tuner to use. -f, --frequency <number> Selects the frequency use. -p, --palette <name> Selects the palette format to use. -D, --delay <number> Sets the pre-capture delay time. (seconds) -r, --resolution <size> Sets the capture resolution. --fps <framerate> Sets the capture frame rate. -F, --frames <number> Sets the number of frames to capture. -S, --skip <number> Sets the number of frames to skip. --dumpframe <filename> Dump a raw frame to file. -s, --set <name>=<value> Sets a control value. --revert Restores original captured image. --flip <direction> Flips the image. (h, v) --crop <size>[,<offset>] Crop a part of the image. --scale <size> Scales the image. --rotate <angle> Rotates the image in right angles. --deinterlace Reduces interlace artifacts. --invert Inverts the images colours. --greyscale Removes colour from the image. --swapchannels <c1c2> Swap channels c1 and c2. --no-banner Hides the banner. --top-banner Puts the banner at the top. --bottom-banner Puts the banner at the bottom. (Default) --banner-colour <colour> Sets the banner colour. (#AARRGGBB) --line-colour <colour> Sets the banner line colour. --text-colour <colour> Sets the text colour. --font <[name][:size]> Sets the font and/or size. --no-shadow Disables the text shadow. --shadow Enables the text shadow. --title <text> Sets the main title. (top left) --no-title Clears the main title. --subtitle <text> Sets the sub-title. (bottom left) --no-subtitle Clears the sub-title. --timestamp <format> Sets the timestamp format. (top right) --no-timestamp Clears the timestamp. --gmt Use GMT instead of local timezone. --info <text> Sets the info text. (bottom right) --no-info Clears the info text. --underlay <PNG image> Sets the underlay image. --no-underlay Clears the underlay. --overlay <PNG image> Sets the overlay image. --no-overlay Clears the overlay. --jpeg <factor> Outputs a JPEG image. (-1, 0 - 95) --png <factor> Outputs a PNG image. (-1, 0 - 10) --save <filename> Save image to file. --exec <command> Execute a command and wait for it to complete. ~~~ ## mjpeg-streamer 前置软件： ~~~ sudo apt-get update sudo apt-get install g++ libjpeg62-turbo-dev imagemagick libv4l-dev cmake git ~~~ ~~~ sudo git clone https://github.com/jacksonliam/mjpg-streamer.git cd mjpg-streamer/mjpg-streamer-experimental make all sudo make install ~~~ 设置环境变量 `export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib/mjpg-streamer` 开启web服务器 `mjpg_streamer -i "input_uvc.so -d /dev/video0 -r 640x480" -o "output_http.so -p 8080 -w /usr/local/share/mjpg-streamer/www" ` 然后在同个局域网内的电脑的浏览器上访问 zero ip:8080即可看到图像。 ~~~ mjpg_streamer -i "input_uvc.so -f 10 -r 320*240 -y" -o "output_http.so -c "ruoyun:liufeng" -w www -p 8888" -o "output_file.so -d 1000 -f /mnt " -i 输入 "input_uvc.so -f 10 -r 320*240 -y" input_uvc.so：UVC输入组件 -f 10 ：表示10帧 -r 320*240 ：分辨率 -y ：YUV格式输入（有卡顿），不加表示MJPG输入（需要摄像头支持） -o输出 "output_http.so -c "ruoyun:liufeng" -w www -p 8888" output_http.so ：网页输出组件 -c "ruoyun:liufeng" ：用户名：ruoyun 密码：liufeng -w www : 网页输出 -p 8888 ：端口 8888 "output_file.so -d 1000 -f /mnt " output_file.so ：图片输出组件 -d 1000 ：时间1S -f /mnt ：输出图片放在哪，我是开机直接把/mnu挂载到本地文件夹了 ~~~ 总体帮助 ~~~ root@LicheePi:~# mjpg_streamer --help ----------------------------------------------------------------------- Usage: mjpg_streamer -i | --input "<input-plugin.so> [parameters]" -o | --output "<output-plugin.so> [parameters]" [-h | --help ]........: display this help [-v | --version ].....: display version information [-b | --background]...: fork to the background, daemon mode ----------------------------------------------------------------------- Example #1: To open an UVC webcam "/dev/video1" and stream it via HTTP: mjpg_streamer -i "input_uvc.so -d /dev/video1" -o "output_http.so" ----------------------------------------------------------------------- Example #2: To open an UVC webcam and stream via HTTP port 8090: mjpg_streamer -i "input_uvc.so" -o "output_http.so -p 8090" ----------------------------------------------------------------------- Example #3: To get help for a certain input plugin: mjpg_streamer -i "input_uvc.so --help" ----------------------------------------------------------------------- In case the modules (=plugins) can not be found: * Set the default search path for the modules with: export LD_LIBRARY_PATH=/path/to/plugins, * or put the plugins into the "/lib/" or "/usr/lib" folder, * or instead of just providing the plugin file name, use a complete path and filename: mjpg_streamer -i "/path/to/modules/input_uvc.so" ----------------------------------------------------------------------- ~~~ 输入插件帮助 ~~~ root@LicheePi:~# mjpg_streamer -i "input_uvc.so --help" MJPG Streamer Version.: 2.0 --------------------------------------------------------------- Help for input plugin..: UVC webcam grabber --------------------------------------------------------------- The following parameters can be passed to this plugin: [-d | --device ].......: video device to open (your camera) [-r | --resolution ]...: the resolution of the video device, can be one of the following strings: QQVGA QCIF CGA QVGA CIF PAL VGA SVGA XGA HD SXGA UXGA FHD or a custom value like the following example: 640x480 [-f | --fps ]..........: frames per second (activates YUYV format, disables MJPEG) [-q | --quality ] .....: set quality of JPEG encoding [-m | --minimum_size ].: drop frames smaller then this limit, useful if the webcam produces small-sized garbage frames may happen under low light conditions [-e | --every_frame ]..: drop all frames except numbered [-n | --no_dynctrl ]...: do not initalize dynctrls of Linux-UVC driver [-l | --led ]..........: switch the LED "on", "off", let it "blink" or leave it up to the driver using the value "auto" [-t | --tvnorm ] ......: set TV-Norm pal, ntsc or secam [-u | --uyvy ] ........: Use UYVY format, default: MJPEG (uses more cpu power) [-y | --yuv ] ........: Use YUV format, default: MJPEG (uses more cpu power) [-fourcc ] ............: Use FOURCC codec 'argopt', currently supported codecs are: RGBP --------------------------------------------------------------- Optional parameters (may not be supported by all cameras): [-br ].................: Set image brightness (auto or integer) [-co ].................: Set image contrast (integer) [-sh ].................: Set image sharpness (integer) [-sa ].................: Set image saturation (integer) [-cb ].................: Set color balance (auto or integer) [-wb ].................: Set white balance (auto or integer) [-ex ].................: Set exposure (auto, shutter-priority, aperature-priority, or integer) [-bk ].................: Set backlight compensation (integer) [-rot ]................: Set image rotation (0-359) [-hf ].................: Set horizontal flip (true/false) [-vf ].................: Set vertical flip (true/false) [-pl ].................: Set power line filter (disabled, 50hz, 60hz, auto) [-gain ]...............: Set gain (auto or integer) [-cagc ]...............: Set chroma gain control (auto or integer) --------------------------------------------------------------- input_init() return value signals to exit ~~~ 输出插件帮助 ~~~ root@LicheePi:~# mjpg_streamer -o "output_http.so --help" MJPG Streamer Version.: 2.0 --------------------------------------------------------------- Help for output plugin..: HTTP output plugin --------------------------------------------------------------- The following parameters can be passed to this plugin: [-w | --www ]...........: folder that contains webpages in flat hierarchy (no subfolders) [-p | --port ]..........: TCP port for this HTTP server [-l ] --listen ]........: Listen on Hostname / IP [-c | --credentials ]...: ask for "username:password" on connect [-n | --nocommands ]....: disable execution of commands --------------------------------------------------------------- output_init() return value signals to exit ~~~