[問題] Costco為何能偵測到有無車輛停駐
有些百貨公司或Costco的停車位上方都有燈號顯示該位置有無車輛停駐
當有車輛停駐時,燈號為紅色,反之則為綠色
有人知道這是怎麼做到的嗎?是用類似倒車雷達的原理嗎?
又倒車雷達在黑暗時依然能偵測到後方的障礙物嗎?
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