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calculate the area of unstructured shape in image

i'm new to opencv, so any advise would be highly appreciated. Is there an API that I can use in order to calculate the accurate area of an unstructured shape drawn on image? The image is expected to be captured by a camera. is there a way to calculate the distance from which the picture has been taken, for the same purpose of calculating the real area (as the distance will impact the size on picture)?