extract image from array.

I take down some snapshots from logitech camera and images are stored in array form in pics folder name. Now I want to see those pictures (in png format). So how can i extract iamges from those array. number of images are 20.

Answer 1

[Walter Roberson]

http://matlab.wikia.com/wiki/FAQ#How_can_I_process_a_sequence_of_files.3F

[Naseeb Gill]

Sorry sir but i'm unable to do it. Can you please elaborate it for me or provide me any simple code example to illustrate it. Sorry for inconvenience. Thanks

[Walter Roberson]

dinfo = dir('*.png');
for K = 1 : length(dinfo)
  thisfile = dinfo(K).name;
  thisimage = imread(thisfile);
  figure(); image(thisimage); title(thisfile);
end

[Naseeb Gill]

It's also not working. I think it's my mistake that I can't explain my problem to you. So, i'm trying again. Thanks for your patience. using camera i takes snapshots and stored them into array form. Code for this is:

vid1 = videoinput('winvideo',1,'RGB24_640x480');
vid2 = videoinput('winvideo',2,'RGB24_640x480');
start(vid1);
start(vid2);
preview(vid1);
preview(vid2);
pics1 = cell(1,10)
pics2 = cell(1,10)
for i = 1: 10
  pause(5);
  pics1{i} = getsnapshot(vid1);
  pics2{i} = getsnapshot(vid1);
end
closepreview(vid1);
closepreview(vid2);

 clear ('vid1');
 clear ('vid2');

Now arrays are stored in pics1 and pics2 but I want to watch them as .png image and store them as .png only in other folder. how can i do that.

Thanks.

[Walter Roberson]

You cannot "watch" PNG images, you can only watch images that have been loaded (possibly from PNG files)

But in any case:

ax1 = subplot(1,2,1);
ax2 = subplot(1,2,2);

for K = 1 : length(pics1)
  imshow(ax1, pic1{K});
  outfile1 = sprintf('pic1_%03d.png', K);
  imwrite(pic1{K}, outfile1, 'png');

    imshow(ax2, pic2{K});
    outfile2 = sprintf('pic2_%03d.png', K);
    imwrite(pic2{K}, outfile2, 'png');

    pause(0.25);    %or as appropriate
  end

And remember to change your code

pics2{i} = getsnapshot(vid1);

to

pics2{i} = getsnapshot(vid2);

[Naseeb Gill]

Thanks for pointing out my mistake. I solved this problem using following code:

 vid1 = videoinput('winvideo',1,'RGB24_640x480'); 
 vid2 = videoinput('winvideo',2,'RGB24_640x480');
 start(vid1);
start(vid2);
preview(vid1);
preview(vid2);
pics1 = cell(1,10)
pics2 = cell(1,10)
for i = 1: 10
    pause(5);
    pics1{i} = getsnapshot(vid1);
    pics2{i} = getsnapshot(vid2);
end
for i = 1:10
    FileName1 = sprintf( 'pica%d.png',i) ;
    fullFileName1 = fullfile( FileName1);
    imwrite(pics1{i}, fullFileName1);

    FileName2 = sprintf( 'picb%d.png',i) ;
    fullFileName2 = fullfile( FileName2);
    imwrite(pics2{i}, fullFileName2);
end
closepreview(vid1);
closepreview(vid2);

 clear ('vid1');
 clear ('vid2');

but now I'm facing a new problem that images store in default folder but i want to save images in predetermined folder say in 'image_folder' folder present on desktop. How can I do it???

[Walter Roberson]

project_dir = 'C:\wherever\the\desktop\is\image_folder';

Then

fullFileName1 = fullfile( project_dir, FileName1);

and the corresponding for the second file.