matlab调用下摄像头，用GUI界面显示摄像头的画面并实现拍照

% 建立videoinput对象

obj = videoinput('winvideo');

% 设置属性

set(obj, 'FramesPerTrigger', 1);

set(obj, 'TriggerRepeat', Inf);

% 建立界面

hf = figure('Units', 'Normalized', 'Menubar', 'None', ...

'NumberTitle', 'off', 'Name', '拍照功能GUI演示);

ha = axes('Parent', hf, 'Units', 'Normalized', ...

'Position', [.05 .2 .85 .7]);

axis off %关闭坐标轴

hb1 = uicontrol('Parent', hf, 'Units', 'Normalized', ...

'Position', [.25 .05 .2 .1], 'String', '预览', ...

'Callback', ...

['objRes = get(obj, ''VideoResolution'');' ...

'nBands = get(obj, ''NumberOfBands'');' ...

'hImage = image(zeros(objRes(2), objRes(1), nBands));' ...

'preview(obj, hImage);']);

hb2 = uicontrol('Parent', hf, 'Units', 'Normalized', ...

'Position', [.55 .05 .2 .1], 'String', '拍照', ...

'Callback', 'imwrite(getsnapshot(obj), ''im.jpg'')');