The pixel data includes first pixel data generated on a first sweep line, according to {HEAD ~ a distance} from a transmitting source, based on an echo of a detection signal from the source toward {TAIL ~ a first direction}, and second pixel data generated on a second sweep line, according to a distance from the source, based on an echo of a detection signal from the source toward a second direction different from the first direction 
The pixel data includes first pixel data generated on a first sweep line , according to { HEAD ~ a distance } from a transmitting source , based on an echo of a detection signal from the source toward { TAIL ~ a first direction } , and second pixel data generated on a second sweep line , according to a distance from the source , based on an echo of a detection signal from the source toward a second direction different from the first direction
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH