Face contour detection - Image processing

Dear Image processing experts, I have a requirement in C++ image processing to detect the contour of human face in image. Five coordinates are manually place along the face contour. Please refer to the attached image [login to view URL] to see the sample coordinate placement. If we draw a bezier curve along the five points, the line may almost passing through the face contour. But it is not very accurate for many cases. Hence we need face contour detection. input 1 : one rbg image input 2 : 5 coordinates along the face contour. output : draw line along the face contour. You are welcome to use opencv or such opensource libraries. I have attached additional two images which shows two real cases. You may notice that the boundary between the face and neck is very vague. You may use algorithm such as "active contours", but it is up to you. We expect high accuracy on the result, so bid only if you have experience in this. If you are really good at this kind of image processing, we can provide you many such projects. After you place the bid, I will sent you some testcases and further details. Happy bidding.