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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)?

thanks