关于摄像头
摄像头有很多种类型格式，我们为了方便起见，直接淘宝上淘了一个带麦克风的USB摄像头，支持UVC协议，无需安装驱动即可使用，方便，带麦克风是因为我们后面指不定就加个语音唤醒、语音识别之类的功能玩玩呢！
插入及检测摄像头
将摄像头插入树莓派的usb口，使用命令lsusb查看是否发现摄像头：
usb摄像头.PNG
这里的Genius是我们购买摄像头的品牌。
摄像头的验证
使用motion软件进行摄像头管理
- 安装motion软件：
sudo apt-get install motion - 配置motion
sudo vi /etc/motion/motion.conf
配置可以在后台运行：
修改如下内容，主要是为了令motion可在后台运行及将视频内容可以从外部访问查看：
yinan@raspberrypi:~ $ diff -du2 /etc/motion/motion.conf.bk /etc/motion/motion.conf
--- /etc/motion/motion.conf.bk 2018-03-24 01:32:36.744054535 +0000
+++ /etc/motion/motion.conf 2018-03-24 09:17:18.628150078 +0000
@@ -9,5 +9,5 @@
# Start in daemon (background) mode and release terminal (default: off)
-daemon off
+daemon on
# File to store the process ID, also called pid file. (default: not defined)
@@ -98,12 +98,12 @@
# Image width (pixels). Valid range: Camera dependent, default: 352
-width 320
+width 640
# Image height (pixels). Valid range: Camera dependent, default: 288
-height 240
+height 480
# Maximum number of frames to be captured per second.
# Valid range: 2-100. Default: 100 (almost no limit).
-framerate 2
+framerate 5
# Minimum time in seconds between capturing picture frames from the camera.
@@ -502,5 +502,5 @@
# Restrict stream connections to localhost only (default: on)
-stream_localhost on
+stream_localhost off
# Limits the number of images per connection (default: 0 = unlimited)
@@ -535,5 +535,5 @@
# Restrict control connections to localhost only (default: on)
-webcontrol_localhost on
+webcontrol_localhost off
# Output for http server, select off to choose raw text plain (default: on)
- 运行motion
sudo motion - 查看摄像头内容
在电脑的浏览器中打开，网址树莓派IP:8081，顺便秀一下小PI:
image.png - 停止motion
killall motion或者service motion stop
好了，看了摄像头是没问题了，下一步就该加上物体检测的功能了。
