Issues with web cam application in Matlab

matlab pc cam

Hi All,

I have been studying on web cam application.

1)In the "main.m", I used setappdata(handles.himage,'UpdatePreviewWindowFcn',@ Processingeyedetection);...

2)In the "Processingeyedetection.m", I used:

function ProcessLeft(obj,event,himage)
%save the image into the temp to call again at the end of the program
temp=event.Data;
**********
%PLACE-A
******
event.Data=temp;
%turn back into the main program
set(himage, 'CData', event.Data);

Result: It works fine,if there is no script PLACE-A. If there is scripts, the camera view becomes very slow. When I hands up, I show it after 14-15 seconds. (Meanwhile, the used RAM becomes close to around 100Mb.) When I disable PLACE-A, the program works normal, and show the memorized frames very fastly, then turn in normal speed. You can say that PLACE-A has a big computational load.

BUT!
I measured the processing time of PLACE-A, it is only 0.2 seconds. But, why I see that frame after 14-15 seconds. Is the problem in the main function? If it is about "main.m", why I don't have any trouble when there is no script in PLACE-A?

Thank you.
Best regards,