how to access cell elements in for loop

if true
  myFolder = 'E:\\inverted\\i1';

for PicNum = 100:-1:1; fullFileName = fullfile(myFolder,sprintf('%d.bmp',PicNum)); fprintf(1, 'Now reading %s\n', fullFileName);

    imageArray{PicNum}=imread(fullFileName);
    logicalImage{PicNum}=imageArray{PicNum} ~=0;
    feature_extractor(logicalImage{PicNum});//here im trying to access <1*100> size cell elements.

   imshow(imageArray{PicNum});  % Display image.

end

end
each element has logical values of a image.I need to extract features for each image.with the above code i could not accomplish my task.help me out.thanks in advance...