Serializing checkboxes inside table (datatables)

I'm using jquery datatables, the created table html is:

<table id="product-table">
  <tr role="row" class="odd">
    <td>
      <div class="vd_checkbox">
        <input type="checkbox" class="checkbox-group" id="c3800">
        <label for="c3800"></label>
      </div>
    </td> ...
</table>

I'm using this code to serialize checkboxes to be sent via ajax to be processed.

<script type="text/javascript">
var table;
$(document).ready(function () {
table = $('#product-table').DataTable(options);
$('#b_submit').click(function () {
var data = table.$('input').serialize();
alert("The following data would have been submitted to the server: \n\n" +
                    data.substr(0, 120) + '...');
return false;
});
</script>

But this doesn't serialize any checkbox (alerts the message only). How can I serialize them?