how i can capture and then save many images using kinect camera at one time?

how i can capture and thensave many images using kinect camera at one time? i am using matlab by making GUI. i can save image now but i want to save more then one images with the passing of seconds. kindly guide me thanks

[Florian Morsch]

Just use the method of saving you have now in a loop?

[Muhammad Hammad Malik]

thanks for your kind reply.see attach image. i am using this code to save image but this is saving one image at one time, i want to save multiple images in each second.<</matlabcentral/answers/uploaded_files/129150/Capture.JPG>>

[Florian Morsch]

I dont know what you have attached there, its no link ;)

This might help you, its a example on how to get multiple images from a webcam. Since you already can get your images from the kinect you just can change the loop in the example. https://de.mathworks.com/help/supportpkg/usbwebcams/ug/acquire-webcam-images-in-a-loop.html

And for the saving of the images you could take a look here: https://de.mathworks.com/matlabcentral/answers/115539-how-to-save-write-images-using-for-loop

[Muhammad Hammad Malik]

thanks for your kind help. i have used this code

N = 4;
A = imread('my_img.png');
for ii = 1:N   
   imwrite(A,strcat('my_new',num2str(ii),'.png'));
end

from link given by you. when i run this code it is saving multiple images but when again i run this, it overwrite the images on previous ones instead creating the new images. so how to do that? thanks

Answer 1

[Florian Morsch]

Right now you have a fixed N, in this case N=4 and if you run your code you will save the images to my_new1.png, my_new2.png, and so on. Now if you run the code again, the N stays the same which causes the name to be the same, thats why you are overriting the images. If you want to save multiple images in the folder, search for all image files in the folder, count them and then add that number to the name.

From this already answered question ( https://de.mathworks.com/matlabcentral/answers/65564-find-total-number-of-images-in-a-folder ) you can learn how to count the images in a folder.

You can use

a=dir([yourfolder '/*.jpg']); %%You have to give your folder location here
out=size(a,1);
N = 4;
A = imread('my_img.png'); 
for ii = 1:N
NumberOfNextImage=ii + out;
imwrite(A,strcat('my_new',num2str(NumberOfNextImage),'.png'));

Now your code would check for the total amount of images in the folder and if you run with 4 images and say you already have 12 in the folder, your images would be named ii + 12, so my_img13.png, my_img14.png, ... and so on.

[Muhammad Hammad Malik]

thanks.i tried it but it is giving error like 'Unable to open file "my_new1.jpg" for writing. You might not have write permission'. code of error:imwrite(color,strcat('my_new',num2str(NumberOfNextImage),'.jpg'));

[Walter Roberson]

You are probably cd'd to a directory you do not have write access to; in particular you are probably cd'd to the directory MATLAB is installed in. You should cd to somewhere you can write files.

[Muhammad Hammad Malik]

i am saving images in F drive, not in C and i already saved images in F drive but when i use this code then it is showing this error. see the code:

a=dir(['F:\kinect data\color\plant' '/*.jpg']);
out=size(a,1);
N = 4;
for ii = 1:N
    NumberOfNextImage=ii + out;
    imwrite(color,strcat('my_new',num2str(NumberOfNextImage),'.jpg'));
end

[Walter Roberson]

@Muhammad Hammad Malik

That code tries to write images into the current directory, not into the directory that you read the images from.

imgdir = 'F:\kinect data\color\plant';
a = dir( fullfile(imgdir, '*.jpg') );
out=size(a,1);
N = 4;
for ii = 1:N
    %at this point, update the variable named color with a new image
    NumberOfNextImage=ii + out;
    outfile = fullfile(imgdir, "my_new" + NumberOfNextImage + ".jpg");
    imwrite(color, outfile);
end

Answer 2

[Mohamed Ramadan]

mycam=webcam
preview(mycam)
img=snapshot(mycam);
imshow(img)
imwrite(img,'newimage.jpg');