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