Matlab摄像头视频基本处理

、读取摄像头

1.首先保证摄像头及其驱动正确在电脑上安装
2.简单的代码显示驱动摄像头，并显示:

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print?

1. vid = videoinput('winvideo',1);  
2. preview(vid);  

vid = videoinput('winvideo',1);preview(vid);

3.默认显示彩色rgb图像，可用下面代码转换为灰度图像:

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print?

1. set(vid,'ReturnedColorSpace','grayscale');  

set(vid,'ReturnedColorSpace','grayscale');

若要还原为彩色图像，即把上面的grayscale换成rgb

二、获取摄像头图像

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1. image = getsnapshot(vid);%获得图像矩阵  
2. figure;  
3. imshow(image);%显示该幅图片  

image = getsnapshot(vid);%获得图像矩阵figure;imshow(image);%显示该幅图片

三、保存视频

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1. writerObj = VideoWriter( [filename '.avi'] );%创建.avi文件  
2. writerObj.FrameRate = N;%设置视频帧率  
3. open(writerObj);  
4.   
5. figure;  
6. for ii = 1: nframe  
7.     frame = getsnapshot(vid);  
8.     imshow(frame);  
9.     f.cdata = frame;  
10.     f.colormap = [];  
11.     writeVideo(writerObj,f);  
12. end  
13.   
14. close(writerObj);  

writerObj = VideoWriter( [filename '.avi'] );%创建.avi文件writerObj.FrameRate = N;%设置视频帧率open(writerObj);figure;for ii = 1: nframe    frame = getsnapshot(vid);    imshow(frame);    f.cdata = frame;    f.colormap = [];    writeVideo(writerObj,f);endclose(writerObj);

四、摄像头深刻理解

    imaqhwinfo()函数返回一个结构体，里面包含DeviceID和DeviceInfo，DeviceID存储着电脑上所有可用摄像头的ID，每个ID对应一个摄像头。DeviceInfo中存储着每个摄像头的信息，最主要的就是摄像头所支持的视频格式。通过下面代码可以得到DeviceID和DeviceInfo中支持的格式信息:

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print?

1. cam_info = imaqhwinfo('winvideo');  
2. cam_info.DeviceInfo.DeviceID  
3. cam_info.DeviceInfo.SupportedFormats  

cam_info = imaqhwinfo('winvideo');cam_info.DeviceInfo.DeviceIDcam_info.DeviceInfo.SupportedFormats

得到支持的格式信息后，即可加到第一个代码中去了:

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print?

1. vid = videoinput('winvideo',1,'Formats');  

vid = videoinput('winvideo',1,'Formats');