A needle shield system may include a needle, an inner tube, a clip within the inner tube, an outer tube, andor a housing. The stable case has a bottom plate and at least three sidewalls connected to the bottom plate, and the movable case has a back rim and two side rims connected thereto. The data related to the picture size indicates a size of the picture corresponding to the picture signal or an output area, which is a pixel area to be outputted in decoding in a whole pixel area coded in the picture signal coding.