Extracting Frames and resizing each frame

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Iqra Saleem 2019-2-15

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评论： kousar majeed 2019-6-14

在 MATLAB Online 中打开

Hy, i convert YUV video file to frames but now i want to change size of every frames , how can i do that?

My code is:

clc; clear; close all;
VideoSequence = 'sampleQCIF.yuv';
width = 176;
height = 144;
nframes = 300;
[Y,U,V] = yuvRead(VideoSequence, width, height, nframes);
figure;
c = 0;  % counter
for iFrame = 1:10
    c = c + 1;
   subplot(4,5,c), 
imshow(Y(:,:,iFrame));
title(['frame #', num2str(iFrame)]);
end

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Iqra Saleem 2019-2-15

Name Size Bytes Class Attributes

RGB 1x1 1 uint8

columns 1x1 8 double

grayImage 1x1 1 uint8

rows 1x1 8 double

This is about class.

Iqra Saleem 2019-2-15

sorry, my problem is different.

I attached original Matlab code and also output.

This code extract frames from YUV video precisley, but when i save those frames in laptop folder,they are not opening.

kinfly check my attach code and output.

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回答（2 个）

KALYAN ACHARJYA 2019-2-15

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编辑：madhan ravi 2019-2-15

在 MATLAB Online 中打开

Frames are images use the following, read here imresize

frame_resize=imresize(frame_names,scaling_value)

For multiple frames, you can call those and do the same. Also similar question answer is available, please look here, still unable to solve it, let me know.

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Iqra Saleem 2019-2-17

oh sorry, now again check attachments.

Walter Roberson 2019-2-17

Why did you remove the basefilename / fullfile code ? You are now specifying the name of a folder as the only output location. MATLAB will not be able to automatically figure out what file name to output to by guessing that you want to use the same output file name as the last file you input: you need to tell it the output file name.

I am not going to bother to type in the repaired code for you by reading your code off of your image. If you continue to have problems with this, post your code as code.

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kousar majeed 2019-6-14

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how can i extract the frame and save like 1-1.jpg in the folder with the name frame folder

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kousar majeed 2019-6-14

vidobj = VideoReader(thisfile);

giving me error in this line

kousar majeed 2019-6-14

clc;

close all;

clear all;

% assigning the name of sample avi file to a variable

filename = 'Chili.avi.mp4';

%reading a video file

mov = VideoReader(filename);

% Defining Output folder as 'Frames'

opFolder = fullfile(cd, 'Frames');

%if not existing

if ~exist(opFolder, 'dir')

%make directory & execute as indicated in opfolder variable

mkdir(opFolder);

end

%getting no of frames

numFrames = mov.NumberOfFrames;

%setting current status of number of frames written to zero

numFramesWritten = 0;

%for loop to traverse & process from frame '1' to 'last' frames

for t = 1 : numFrames

currFrame = read(mov, t); %reading individual frames

opBaseFileName = sprintf('%3.3d.png', t);

opFullFileName = fullfile(opFolder, opBaseFileName);

imwrite(currFrame, opFullFileName, 'png'); %saving as 'png' file

%indicating the current progress of the file/frame written

progIndication = sprintf('Wrote frame %4d of %d.', t, numFrames);

disp(progIndication);

numFramesWritten = numFramesWritten + 1;

end %end of 'for' loop

progIndication = sprintf('Wrote %d frames to folder "%s"',numFramesWritten, opFolder);

disp(progIndication);

%End of the code

% make another folder with the name of Faces

mkdir Faces

===== upto here i run the video and it save in folder of frame. create another folder with the name of faces.now how can i extract the face using move command to load from frame folder and extract the face and save it into face folder=============

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