本文不知道为什么就乱掉了,又用markdown的格式写了一个,看这里:
一.摄像头安装
如图从两端拔起,插入,再按紧
二.摄像头预览
1. 打开python3,建立名为camera.py的新文件,注意,千万不能命名为picamera.py
2. 在文件中写入一下代码,运行即可,注意:远程连接(例如:SSH和VNC)时不允许访问摄像头
from picamera import PiCamera
from time import sleep
camera = PiCamera()
camera.start_preview()
sleep(10)
camera.stop_preview()
3. 如果图像时上下颠倒的,可以用一下代码实现翻转
camera
rotation
camera
start_preview
sleep
camera
stop_preview
可以设置旋转的度数为90,180或270,也可以设置为0
4. 通过改变alpha的值,可以修改摄像头拍摄图像的透明度
picamera
PiCamera
time
sleep
camera
PiCamera
camera
start_preview
alpha
sleep
camera
stop_preview
alpha的取值范围为0-255
三.拍照片
1. 修改代码:减少sleep并添加camera.capture()一行
camera
start_preview
sleep
camera
capture
camera
stop_preview
捕获图片前,至少要给传感器两秒钟时间感光
2. 增加一个循环就能实现连拍,每隔5秒拍一张,拍完后预览关闭,桌面上就有五张图了
camera
start_preview
i
range
sleep
camera
capture
i
camera
stop_preview
3. 查看图片:gpicview image1.jpg
四.拍视屏
1. 修改代码:用start_recording()和stop_recording()代替capture()
camera
start_preview
camera
start_recording
sleep
camera
stop_recording
camera
stop_preview
2. 运行程序,将拍摄10秒的视屏,然后关闭预览
3. 播放视屏需要执行如下指令:
omxplayer video
h264
4. 播放时可能会出现播放速度比实际速度快的情况,这是omxplayer的快速帧速率导致的
五.进阶教程
1. 摄像头的分辨率可以自己设定,但要记住,照片的最大分辨率时2592x1944,视频的最大分辨率为1920x1080,可以通过一下代码设定分辨率,为了配合最大分辨率,需要设置帧速率为15
camera
resolution
camera
framerate
camera
start_preview
sleep
camera
capture
camera
stop_preview
2. 最小分辨率允许设为64x64
3. 用annotate_text很方便地为图像添加文字
camera
start_preview
camera
annotate_text
sleep
camera
capture
camera
stop_preview
4. 改变亮度设置,范围是0-100,预设为50
camera
start_preview
camera
brightness
sleep
camera
capture
camera
stop_preview
5. 在循环中调整亮度,并标注亮度等级
camera
start_preview
i
range
camera
annotate_text
i
camera
brightness
i
sleep
camera
stop_preview
6. 调节文字大小,6-160,预设为32
camera
annotate_text_size
7. 改变文字的颜色,首先要引入Color,然后就能用如下代码实现
picamera
PiCamera
Color
camera
start_preview
camera
annotate_background
Color
camera
annotate_foreground
Color
camera
annotate_text
sleep
camera
stop_preview
8. camera.image_effect为图片添加特殊效果,可选择的参数有:none,negative,solarize,sketch,denoise,emboss,oilpaint,hatch,gpen,pastel,watercolor,film,blur,saturation,colorswap,washedout,posterise,colorpoint,colorbalance,cartoon,deinterlace1和deinterlace2。预设为none。
camera
start_preview
camera
image_effect
sleep
camera
capture
camera
stop_preview
9. 用循环显示不同效果的预览
camera
start_preview
effect
camera
IMAGE_EFFECTS
camera
image_effect
effect
camera
annotate_text
effect
sleep
camera
stop_preview
10. camera.awb_mode可以设置白平衡,可选参数有:off,auto, sunlight, cloudy, shade, tungsten, fluorescent,incandescent, flash和horizon,预设为auto
camera
start_preview
camera
awb_mode
sleep
camera
capture
camera
stop_preview
可以用camera.AWB_MODES循环展示多个白平衡模式
11. camera.exposure_mode可以设置曝光,可选参数有:off,auto,night,nightpreview,nightpreview,spotlight,sports,snow,beach,verylong,fixedfps,antishake,fireworks。预设是auto
camera
start_preview
camera
exposure_mode
sleep
camera
capture
camera
stop_preview
可以用camera.EXPOSURE_MODES循环展示多个曝光模式