c++ - How to obtain pixels along math function? -


I have an OpenCV image, a mathematical function such as x ^ 2 and a set of discrete calculation points with this function. How do I get the pixels of underlying discrete digits? Since calculation numbers are of type cv: Point2d () for example (4.2823, 7.2442), I do not know how to map the referenced pixels for it.

Not sure if I was clear enough, just tell me thank you in advance!

You need to map the function's range (like X [5, 5], y [ -25,25], fxmin = -5 and fymin = -25) for the coordinates of the image. Assuming the left and the lowest coordinate of the image xLeftImg = 0, yLowImg = img.ySize () -1, then the computation will be 

  imgpos_x = (point2d.x-fx_min) / (.fxmax -fxmin) * img.size () width; Imgpos_y = img.size (). Height- (point2d.y-fy_min) / (Phimenks-Femin) * img.size (). Height;

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