Modifying frames of a ".avi" file one by one

Question

Piere 2014-1-7

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/111695-modifying-frames-of-a-avi-file-one-by-one

评论： Image Analyst 2014-1-7

Hello, I'm quite new to MATLAB and already have troubles. I'm recording a series of images with my webcam and exporting them as a video file (avi). The goal is to separate the video in frames and adjust the contrast of each frame individually. I understood how to modify the contrast of a single image but I have no idea how to deal with a video file. Give me any instructions or examples how to do it please.

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

Image Analyst 2014-1-7

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/111695-modifying-frames-of-a-avi-file-one-by-one#answer_120271

编辑：Image Analyst 2014-1-7

ExtractMovieAVIFrames.m

Attached below (in blue text) is an example of where I read in the standard rhinos.avi demo video and do something on each frame and create a new movie. Feel free to adapt it as needed.

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。

Answer 2

Piere 2014-1-7

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/111695-modifying-frames-of-a-avi-file-one-by-one#answer_120273

在 MATLAB Online 中打开

Thanks for the fast replay, but again I have a problem. In the beggining when I try to count the number of frames with:

numberOfFrames = videoObject.NumberOfFrames;

It says:

Warning: Unable to determine the number of frames in this file.

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Image Analyst 2014-1-7

That happens sometimes. I'm not sure when. I think Walter said something about some video files not having that info or not having a uniform frame time, or something. Can you convert it with some other program into a "standard" avi file?

请先登录，再进行评论。