What kind of objects are you looking to detect? SSD was trained on VOC0712 9. It should give reasonable results for objects that are relatively related, but for a completely different domain (i.e., medical image data, etc) then it will not work so well. In case your objects are from a different domain, you can always fine-tune the weights on smaller amount of data, or try some domain adaption methods (for example DANN 11) which do not require labels in your new desired image domain.