So I just started with image processing/computer vision in MATLAB.
So my first task is to convert a series of images(frames) into a video. So I went through online sources (MATLAB website more specifically) to get a way to do it.
So the one that I implemented is http://www.mathworks.com/help/matlab/examples/convert-between-image-sequences-and-video.html which solved the problem for me.
However, when I play it, the video seems jumpy in some places. Like it would bring a different frame in the middle and make the whole video jumpy for that split second. It happens a couple of places in the video.
Any anyone knows why this happens?
Thanks
PS below is the code I use:
myFolder = 'C:\Users\owner\Desktop\MATLAB GUI\Color\Color'; %Specify Directory
filePattern = fullfile(myFolder, '*.jpg') %identify jpg files
jpegFiles = dir(filePattern) %use dir to list jpg files
size = length(jpegFiles); % length of the size of the file
outputVideo = VideoWriter(fullfile(myFolder,'video1.avi'));
outputVideo.FrameRate = 30;
open(outputVideo);
for i = 1:length(jpegFiles) %load all the files in the directory
j = i; %%accumulating the number of jpegfiles into handles.j
baseFileName = jpegFiles(i).name;
fullFileName = fullfile(myFolder, baseFileName);
%fprintf(1, 'Now reading %s\n', fullFileName); %filename of image
imageArray = imread(fullFileName); %image being read
%imageArray = rgb2gray(imageArray);
imagecell{i} = imageArray; %storing the images in imagecells
writeVideo(outputVideo,imagecell{i});
end
close(outputVideo);
video1 = VideoReader(fullfile(myFolder,'video1.avi'));
mov(video1.NumberOfFrames) = struct('cdata',[],'colormap',[]);
for ii = 1:video1.NumberOfFrames
mov(ii) = im2frame(read(video1,ii));
end
set(gcf,'position', [150 150 video1.Width video1.Height])
set(gca,'units','pixels');
set(gca,'position',[0 0 video1.Width video1.Height])
image(mov(1).cdata,'Parent',gca);
axis off;
movie(mov,1,video1.FrameRate);
Given that there may be too many files to be renamed (padded with zeros) here is a quick function that will do it for you: you just need to provide the directory/folder where the images are stored, the padding (if less 100 files, then padding can be 2; if less than 1000 files, then padding can be 3; etc.), and a common pattern. The code assumes that there is a common pattern in each file (like 'frame' or 'image') that when removed, leaves just the number:
renameFiles(directory,padSize,fileNamePattern)
filePattern = fullfile(directory, '*.jpg') %identify jpg files
jpegFiles = dir(filePattern) %use dir to list jpg files
for k=1:size(jpegFiles)
% get the source file that will be moved/renamed
fileSrc = jpegFiles(k).name;
% get the parts of the file
[path,name,ext] = fileparts(fileSrc);
% where does the pattern fit in the name?
idx = strfind(name,fileNamePattern);
% remove the pattern from the name
if idx==0
% pattern does not exist in file so skip it
continue;
elseif idx==1
% pattern is at the beginning of name so remove it
frameNumberStr = name(length(fileNamePattern)+1:end);
else
% pattern is at the end of name so remove it
frameNumberStr = name(1:idx-1);
end
% get the number of digits
numDigits = length(frameNumberStr);
% create the new file name
paddedName = [fileNamePattern repmat('0',1,padSize-numDigits) frameNumberStr];
fprintf('%s\n',paddedName);
% only move if the destination is different
if strcmp(paddedName,name) ~= 1
% set the destination file
fileDest = fullfile(directory,[paddedName ext]);
% move the file
movefile(fileSrc, fileDest,'f');
end
end
end
An example - if all files have the common pattern of 'frame' and there are less than 1000 files, then run this function as
rename(pwd,3,'frame')
All files that were named as frame1.jpg or frame99.jpg are now named as frame001.jpg and frame099.jpg.
Hope this helps!
If you have the Computer Vision System Toolbox you can use the vision.VideoFileWriter object. You can simply feed images into its step() method one at a time, and they will be written to the video file as video frames. Note that the images must all be the same size and have the same data type.
Related
I make different measures and save it like *.log files, calculate it and save as .*txt.
%Filtering log files
l = dir('*.log');
%Array size detection
[rows cols] = size(l);
%Choose a last file
file_name = strcat(strcat(l(rows).folder,'/'),l(rows).name)
%Reading log last file
fileread = fopen(file_name);
%Convert to float
times = fread(fileread,'float32');
%Filtering times and set to 0 small values
times(times<1e-8)=0;
%Set right times values
times_s = times * 1.0e-06;
%Solve full rotation speed (Hz)
motorspeed_full = 1./(2.*times_s)
%Filtering inf values and set to 0
motorspeed_full(motorspeed_full>1e+10)=0;
%Solve half rotation speed (Hz)
motorspeed_half = 1./(times_s);
A = '.txt';
[filepath,name,ext] = fileparts(file_name);
Xfilename = cat(2,name,A);
dlmwrite(Xfilename,motorspeed_full,'precision','%.3f');
So, it's possible to choose a last file, calculating it and convert it to .*txt. So now, I have to make a calculation after every measure.
My aim is:
Making first 1...n measures (1...n - *.log's and wav's)
Calculating and saving 1...n *.log's to *.txt's (see picture)
Create folder with file_name (ex. 20181120_125713) and insert file_name.txt and file_name.wav into this folder structure
Questions:
How can I converting all *.log files to *.txt files using dlmwrite?
How can I create a new folder with file_name
mkdir(name);
for all files?
How to move the files with same names to folder with same name? Name of folder changes every time, so i can't work with
movefile source destination
Thank you very much for any help :*)
Here is my solution. Maybe it can help somebody:
clear all;
clc;
%Filtering log files
l = dir('*.log');
for k = 1:length(l)
next_name = l(k).name
%Array size detection
[rows cols] = size(l);
%Choose a last file
file_name = next_name;
%Reading log last file
fileread = fopen(file_name);
%Convert to float
times = fread(fileread,'float32');
%Filtering times and set to 0 small values
times(times<1e-8)=0;
%Set right times values
times_s = times * 1.0e-06;
%Solve full rotation speed (Hz)
motorspeed_full = 1./(2.*times_s);
%Filtering inf values and set to 0
motorspeed_full(motorspeed_full>1e+10)=0;
%Solve half rotation speed (Hz)
motorspeed_half = 1./(times_s);
A = '.txt';
[filepath,name,ext] = fileparts(file_name);
Xfilename = [name,A];
mkdir(name)
dlmwrite([name,filesep,Xfilename],motorspeed_full,'precision','%.3f');
% [name,'.wav'],[name, file, name, '.wav']
movefile([name,'.wav'],[name, filesep, name, '.wav']);
end
I have been working on making a database which contains images and their preset values and other important parameters. But unfortunately, I'm not being able to save the initial data of say 10 images in one .csv file. I have made the code that runs fine with creating .csv file but saving the last value and overwriting all the previous values. I gave also once modified that is comment down in the code using sprintf but it make .csv file for every iteration separately. But i want to make one .csv file containing 7 column with all the respective values.
My code is below and output of my code is attached Output.
Please someone guide me how to make single .csv file with 10 values for instance (could be increased to hundreds in final database) to save in 1 .csv file.
clc
clear all
myFolder = 'C:\Users\USER\Desktop\PixROIDirectory\PixelLabelData_1';
filePattern = fullfile(myFolder, '*.png'); % Change to whatever pattern you need
theFiles = dir(filePattern);
load('gTruthPIXDATA.mat','gTruth')
gTruth.LabelDefinitions;
for i=1:10
%gTruth.LabelData{i,1};
baseFileName = theFiles(i).name;
fullFileName = fullfile(myFolder, baseFileName);
fprintf(1, 'Now reading %s\n', fullFileName);
imageArray = imread(fullFileName);
oUt = regionprops(imageArray,'BoundingBox');
Y = floor(oUt.BoundingBox);
X_axis = Y(1);
Y_axis = Y(2);
Width = Y(3);
Height = Y(4);
CLASS = gTruth.LabelDefinitions{1,1};
JPG = gTruth.DataSource.Source{i,1};
PNG = gTruth.LabelData{i,1};
OUTPUT = [JPG X_axis Y_axis Width Height CLASS PNG]
% myFile = sprintf('value%d.csv',i);
% csvwrite(myFile,OUTPUT);
end
Try fprintf (https://www.mathworks.com/help/matlab/ref/fprintf.html).
You will need to open your output file to be written, then you can append lines to it through each iteration
Simple example:
A = [1:10]; % made up a matrix of numbers
fid = fopen('test.csv','w'); % open a blank csv and set as writable
for i = 1:length(A) % loop through the matrix
fprintf(fid,'%i\n',A(i)); % print each integer, then a line break \n
end
fclose(fid); % close the file for writing
I am stuck on something that is supposed to be so simple.
I have a folder, say main_folder with four sub folders, say sub1, sub2, sub3 and sub4 each containing over 100 images. Now am trying to read and store them in an array. I have looked all over the internet and some MATLAB docs:
here, here and even the official doc.
My code is like this:
folder = 'main_folder/**'; %path containing all the training images
dirImage = dir('main_folder/**/*.jpg');%rdir(fullfile(folder,'*.jpg')); %reading the contents of directory
numData = size(dirImage,1); %no. of samples
arrayImage = zeros(numData, 133183); % zeros matrix for storing the extracted features from images
for i=1:numData
ifile = dirImage(i).name;
% ifolder = dirImage(i).folder;
I=imread([folder, '/', ifile]); %%%% read the image %%%%%
I=imresize(I,[128 128]);
...
If I try the code in the above snippet, the images are not read.
But if I replace the first two lines with something like:
folder = 'main_folder/'; %path containing all the training images
dirImage = dir('main_folder/sub1/*.jpg'); %rdir(fullfile(folder,'*.jpg'));
then all images in sub1 are read. How can I fix this? Any help will be highly appreciated. I want to read all the images in the four sub folders at once.
I am using MATLAB R2015a.
I believe you will need to use genpath to get all sub-folders, and then loop through each of them, like:
dirs = genpath('main_folder/'); % all folders recursively
dirs = regexp(dirs, pathsep, 'split'); % split into cellstr
for i = 1:numel(dirs)
dirImage = dir([dirs{i} '/*.jpg']); % jpg in one sub-folder
for j = 1:numel(dirImage)
img = imread([dirs{i} '/' dirImage(j).name]);
% process img using your code
end
end
I have certain images in a directory and I want to load all those images to do some processing. I tried using the load function.
imagefiles = dir('F:\SIFT_Yantao\demo-data\*.jpg');
nfiles = length(imagefiles); % Number of files found
for i=1:nfiles
currentfilename=imagefiles(i).name;
I2 = imread(currentfilename);
[pathstr, name, ext] = fileparts(currentfilename);
textfilename = [name '.mat'];
fulltxtfilename = [pathstr textfilename];
load(fulltxtfilename);
descr2 = des2;
frames2 = loc2;
do_match(I1, descr1, frames1, I2, descr2, frames2) ;
end
I am getting an error as unable to read xyz.jpg no such file or directory found, where xyz is my first image in that directory.
I also want to load all formats of images from the directory instead of just jpg...how can i do that?
You can easily load multiple images with same type as follows:
function Seq = loadImages(imgPath, imgType)
%imgPath = 'path/to/images/folder/';
%imgType = '*.png'; % change based on image type
images = dir([imgPath imgType]);
N = length(images);
% check images
if( ~exist(imgPath, 'dir') || N<1 )
display('Directory not found or no matching images found.');
end
% preallocate cell
Seq{N,1} = []
for idx = 1:N
Seq{d} = imread([imgPath images(idx).name]);
end
end
I believe you want the imread function, not load. See the documentation.
The full path (inc. directory) is not held in imgfiles.name, just the file name, so it can't find the file because you haven't told it where to look. If you don't want to change directories, use fullfile again when reading the file.
You're also using the wrong function for reading the images - try imread.
Other notes: it's best not to use i for variables, and your loop is overwriting I2 at every step, so you will end up with only one image, not four.
You can use the imageSet object in the Computer Vision System Toolbox. It loads image file names from a given directory, and gives you the ability to read the images sequentially. It also gives you the option to recurse into subdirectories.
I am new in image processing and I want help. I have a folder (dataset) that contains 1000 images and I want to insert noise 'salt & pepper' with different density noise (0.01,0.02 and 0.03) , I used this line to do this:
im = imread('C:\Users\SAMSUNG\Desktop\AHTD3A0002_Para1.tif');
J = imnoise(im,'salt & pepper',0.01);
Please help me to do this : I want to save the result in 3 folder ( data1 contains images after noise with d=0.01, data2 contains images after noise with d=0.02 and data3 contains images after noise with d=0.03).
any suggestation and thanks in advance
Following code will allow you to select the folder and create the noised pictures in 3 different folders. It will only select the '*.tif' files which you can modify in the code. And if you need to create more noise levels, create a loop to name the folders and files dynamically.
% get dir
folderX = uigetdir();
% get files
picFiles = dir('*.tif');
% loop over the files and save them with the noise
for ii = 1:length(picFiles)
currentIm = imread([folderX, '\', picFiles(ii).name]);
% create folders if not exist
if ~exist([folderX,'\noise_0.01\'], 'dir')
% create folders
mkdir([folderX,'\noise_0.01\']);
end
if ~exist([folderX,'\noise_0.02\'], 'dir')
% create folders
mkdir([folderX,'\noise_0.02\']);
end
if ~exist([folderX,'\noise_0.03\'], 'dir')
% create folders
mkdir([folderX,'\noise_0.03\']);
end
J1 = imnoise(currentIm,'salt & pepper',0.01);
imwrite(J1,fullfile([folderX, '\noise_0.01\', picFiles(ii).name]));
J2 = imnoise(currentIm,'salt & pepper',0.02);
imwrite(J2,fullfile([folderX, '\noise_0.02\', picFiles(ii).name]));
J3 = imnoise(currentIm,'salt & pepper',0.03);
imwrite(J3,fullfile([folderX, '\noise_0.03\', picFiles(ii).name]));
end
An easy solution with 2 for loop.
%save the noise parameter.
noise = [0.01,0.02,0.03];
for i = 1:1000
%we generate the filename (you can adapt this code)
imname = fullfile('C:\Users\SAMSUNG\Desktop\',sprintf('AHTD3A0002_Para%d.tif',i))
%read the image.
im = imread(imname);
for j = 1:length(noise)
%apply the noise
J = imnoise(im,'salt & pepper',noise(j));
%save image in the right folder
imwrite(J,fullfile('C:\Users\SAMSUNG\Desktop',sprintf('folder%d',j)));
end
end