count = 0;
        $('.selected').each(function() {
            count++;
            // the idea is to get the value from each ".selected img"
            $('#image' + count).val(   this + img   ).attr("src");
        });

<li><img src="..." alt="" class="selected" /></li>
        <li><img src="..." alt="" /></li>
        <li><img src="..." alt="" /></li>
        <li><img src="..." alt="" class="selected" /></li>

<input type="hidden" id="image1" name="image1" value="" />
    <input type="hidden" id="image2" name="image2" value="" />

$(function() {
    var count = 0;
    $('.selected').each(function() {
        count++;
        var source = $('img', this).attr('src');
        $('input#image' + count).val(source);
    });
});

$('.selected').each(function(idx, obj) {
        $('#image' + (idx + 1)).attr("src", obj.src);
    });

$('img.selected').each(function(i, img) {
    $('#image' + (i + 1)).val(img.src);
});

<ul>
    <li><img src="src0" alt="" class="selected" /></li>
    <li><img src="src1" alt="" /></li>
    <li><img src="src2" alt="" /></li>
    <li><img src="src3" alt="" class="selected" /></li>
</ul>

<input type="text" id="image0" name="image0" value="" />
<input type="text" id="image1" name="image1" value="" />
<input type="text" id="image2" name="image2" value="" />
<input type="text" id="image3" name="image3" value="" />

$('input[type=text]').each(function(idx, e){
    $(this).val($($('img')[idx]).attr('src'));
});