Extract point from a video

Question

Boris Huljak 2017-5-1

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/338215-extract-point-from-a-video

评论： Imran 2020-5-16

Hello. I would like to follow a point on a video by cliking on it, and getting the coordinate as an output (like getpts would do for a picture.) . Do you have any idea on how I can do that with a video, where each next click would send me to a different frame ? Thank you !

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

hmi amid 2017-5-1

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/338215-extract-point-from-a-video#answer_265233

在 MATLAB Online 中打开

I think you should use ginput for this. Use imshow for each frame.

uiopen('video.mp4',1)
for frame=1:size(video,4)
 imshow(video(:,:,:,frame))
 drawnow
 [x(frame),y(frame)]=ginput(1);
end

Amid.

2 个评论
显示无隐藏无

Imran 2020-5-16

In this case, Each frame appears for clicking but frame gets rectangular box once all frames end, that rectangular box appears on just last frame. Can i show all frames with rectangular box once area of box is clicked?

Imran 2020-5-16

As i used 4 ginput(1) four 4 positions. Last frame is working well with showing rectangular box but not from start. Rectangular box appears just on last frame.

请先登录，再进行评论。