[OpenCV] 計算輪廓面積 (Calculate Contour Area)
有時候想知道多邊形的面積，我們可以怎麼做？現在給定幾個座標點，只要呼叫內建的函式contourArea，就會回傳結果數值喔！這篇就叫做計算輪廓面積 (Calculate Contour Area)。
讀取一張600×600的影像，四個座標點分別為(70,70)、(70,170)、(170,170)、(170,70)，面積為10000，因為四邊長都是100，所以用心算就能得出結果。
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