How to make a flashing movie? Please suggest any approach without application of any specific toolbox.

조회 수: 1 (최근 30일)
I am willing to make a video consists of 2 parts that are flashing and steady. The flashing could be in shape i.e circle or triangle. I created circle and dark with the following:
xCenter = 5;
yCenter = 6;
theta = 0 : 0.01 : 2*pi;
radius = 3;
x = radius * cos(theta) + xCenter;
y = radius * sin(theta) + yCenter;
plot(x, y);
fill(x,y,'k');
axis square;
xlim([0 10]);
ylim([0 12]);
axis equal;
set(gca,'Color','k')
And I want the flashing to continue for 17 seconds and steady for 17 seconds repeating 10 times each.

채택된 답변

Geoff Hayes
Geoff Hayes 2020년 5월 5일
Yanjinsuren - do you really mean to create a movie (say with videowriter) or do you just want to have the circle alternate between black (on the black background) and white as per your requirements? To get you started on those, just keep the handle to the fill object, and change it's colour every one second. Something like
hFill = fill(x,y,'k');
axis square;
xlim([0 10]);
ylim([0 12]);
axis equal;
set(gca,'Color','k')
% use colour array [0 0 0] for black
color = [0 0 0];
set(hFill,'FaceColor',color);
for j = 1:10
for k = 1:17
% alternate between black [0 0 0] and white [1 1 1]
set(hFill,'FaceColor',mod(get(hFill,'FaceColor') + 1, 2));
pause(1.0);
end
pause(17);
end
Start with the above and try adding the video writer as needed.
  댓글 수: 2
Yanjika O
Yanjika O 2020년 5월 5일
편집: Yanjika O 2020년 5월 5일
Thank you Geoff. That is exactly what I was trying to explain. Let`s say I call those alternating flash as my first trial and what if I want to have the inter-trial period of complete black for 60 seconds between 2 consecutive trials?
Geoff Hayes
Geoff Hayes 2020년 5월 5일
Just pause for sixty seconds between trials if you want all black:
for k = 1:17
% alternate between black [0 0 0] and white [1 1 1]
set(hFill,'FaceColor',mod(get(hFill,'FaceColor') + 1, 2));
pause(1.0);
end
set(hFill,'FaceColor',[0 0 0]);
pause(60);
end

댓글을 달려면 로그인하십시오.

추가 답변 (0개)

카테고리

Help CenterFile Exchange에서 MATLAB Support Package for IP Cameras에 대해 자세히 알아보기

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by