1. An image-based container defects detector which being able to look for possible location of a container using a container defect positioning program module, then capturing an image of the container number area, said image being segmented from the normal image roughly by a quad-tree split module and an image merge module after its HIS color is transformed by a HIS color transformation module, after segmentation, the normal image being filtered out by an image filter module, finally the segmented defect position being further precisely located by a container defect positioning module.