how can i feed the pre-recorded video to the following code instead of live video(from webcam)/ or how can i save the live video in a 'disk'

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Koohyar 2020-9-3

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评论： Mohammad Sami 2020-9-5

Greeting to the community, I am using matlab for image processing. anybody knows that how can i feed a pre-recorded video to the following code instead of live video(from webcam)?

I need to input pre-recroded video, or using live video but save the video in a folder first (using 'disk' instaed of 'memory') before proceeding the next stage (image processing).

a part of the code:

% Select video format

hws = imaqhwinfo ;

hw = imaqhwinfo(hws.InstalledAdaptors{end},1) ;

VideoFormat = hw.SupportedFormats;

% Select video format

hws = imaqhwinfo ;

hw = imaqhwinfo(hws.InstalledAdaptors{end},1) ;

VideoFormat = hw.SupportedFormats;

set(handles.text_vf, 'String', ['Video Format : ', 'YUY2_640x480']);

% set videoinput object

video = videoinput('winvideo',1,'YUY2_640x480');

set(video,'FramesPerTrigger',10);

set(video,'ReturnedColorSpace','grayscale');

set(video,'LoggingMode','memory');

triggerconfig(video,'immediate');

set(video,'FramesAcquiredFcnCount', 3);

set(video,'FramesAcquiredFcn', {@FramesAcquiredFcn,hObject});

% Preview UPDATE

vidRes = get(video, 'VideoResolution');

vidWin = image(zeros(vidRes(2), vidRes(1)),'Parent',handles.Preview);

preview(video,vidWin);

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Answer 1

Mohammad Sami 2020-9-4

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https://ww2.mathworks.cn/matlabcentral/answers/588664-how-can-i-feed-the-pre-recorded-video-to-the-following-code-instead-of-live-video-from-webcam-or-h#answer_489661

在 MATLAB Online 中打开

You can use the VideoReader to read a video file.

v = VideoReader('xylophone.mp4');
while hasFrame(v)
    frame = readFrame(v);
end

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Koohyar 2020-9-4

编辑：Koohyar 2020-9-4

Hi Mohammad, thanks for your suggestion. Unfortunetly it shows error! I imported the video from the Image Acquisition Tool, and saved in in the directory (.mp4), but it shows error when I call the video (based on your advice), as below:

Error using VideoReader/get

Property VideoResolution not found in class VideoReader, or is not present in all elements of the array of class VideoReader

Any advice you could give would be much appreciated!

thanks

Mohammad Sami 2020-9-5