Abstract: This technique relates to an image output device image output method image processing device image processing method program data structure and imaging device adapted to allow image data to be transmitted in an efficient manner. This technique comprises: generating a header that includes header information and an error detection code the header information including line information that represents line numbers for lines composed of pixel data included in a payload and the error detection code being used to detect an error in the header information; causing pixel data corresponding to a single line constituting an image obtained through imaging to be included in the payload; generating a packet to which the header has been appended; and outputting the packet. This technique can be applied to an imaging device having an image sensor and a DSP.