px4 - What's the effective speed range of px4flow optical flow sensor? -


i‘m reading px4flow_paper, talking principle of px4flow optical flow sensor, can't understand sentence says:

"a search range of ±4 pixels in combination 16mm focal length lens corresponds ±1.5 meters per second object @ 1 meter distance @ 250 frames per second."

my calculation shows 1.5 meters per second corresponds 16 pixels per 1/250 seconds. calculation method follow:

( ( ( (1.5ms/s) / (250f/s) ) / 1m ) * 16mm ) / 6um = 16 pixels

did wrong? wish me understanding actual mean of sentence...

thanks in advance !


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