clc;??%?clc?clears?all?input?and?output?from?the?Command?Window?display?giving?you?a?“clean?screen.“
clear?all;??%??removes?all?variables?from?the?current?workspace?releasing?them?from?system?memory.
close?all;??%?deletes?the?current?figure?or?the?specified?figure（s）.?It?optionally?returns?the?status?of?the?close?operation.
%%

delete（imaqfind）??%?imaqfind:?Find?image?acquisition?objects
%?returns?an?array?containing?all?the?video?input?objects?that?exist?in?memory.?
%?If?only?a?single?video?input?object?exists?in?memory?imaqfind?displays?a?detailed?summary?of?that?object.
%?Nest?a?call?to?the?imaqfind?function?within?the?delete?function?to?delete?all?these?objects?from?memory.

vid=videoinput（‘winvideo‘1）;??%?OS?Generic?Video?Interface
%?creates?a?video?input?object?for?a?webcam?image?acquisition?device.?
%?MATLAB?files?to?use?Windows?Video?Macintosh?Video?or?Linux?Video?cameras?with?the?toolbox.
%?The?correct?OS?files?will?be?installed?depending?on?your?system.
%?Kinect?for?Windows?（kinect）
%?Linux?Video?（linuxvideo）

triggerconfig（vid‘manual‘）;
%?Configure?video?input?object?trigger?properties.
%?configures?the?value?of?the?TriggerType?property?of?the?video?input?object?“vid“
%?to?the?value?specified?by?the?text?string?type?that?here?is?“manual“.?
%?TriggerType?Value?are?immediatemanualhardware.
%?immediate:?The?trigger?occurs?automatically?immediately?after?the?start?function?is?issued.?This?is?the?default?trigger?type.
%?manual:?The?trigger?occurs?when?you?issue?the?trigger?function.?A?manual?trigger?can?provide?more?control?over?image?acquisition.?
%?For?example?you?can?monitor?the?video?stream?being?acquired?using?the?preview?function?
%?and?manually?execute?the?trigger?when?you?observe?a?particular?condition?in?the?scene.
%?hardware:?Hardware?triggers?are?external?signals?that?are?processed?directly?by?the?hardware.


set（vid‘framesPerTrigger‘1?）;??%?The?default?is?10?frames?per?trigger
set（vid‘TriggerRepeat‘?Inf）;
%?Specify?number?of?additional?times?trigger?executes
%?If?TriggerRepeat?is?set?to?its?default?value?of?zero?then?the?trigger?executes?once.
%?If?TriggerRepeat?is?set?to?inf?then?the?trigger?executes?continuously?until?a?stop?function?is?issued?or?an?error?occurs.

%?start（vid）;

%??View?the?default?color?space?used?for?the?data??The?value?of?the?ReturnedColorSpace?property?indicates?the?color?space?of?the?image?data.
color_spec=vid.ReturnedColorSpace;
%?specifies?the?color?space?you?want?the?toolbox?to?use?when?it?returns?image?data?to?the?MATLAB?workspace.?
%?grayscalergbYCbCr

%?Modify?the?color?space?used?for?the?data??
%?To?change?the?color?space?of?the?returned?image?data?set?the?value?of?the?ReturnedColorSpace?property.
if??~strcmp（color_spec‘rgb‘）
????set（vid‘ReturnedColorSpace‘‘rgb‘）;
end

start（vid）??%?to?start?the?image?acquisition?object.


%?Create?a?detector?object
faceDetector?=?vision.CascadeobjectDetector;???
faceDetectorLeye?=?vision.CascadeobjectDetector（‘EyePairBig‘）;?
faceDetectorM?