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you had a contour.convertTo(contour2f, CvType.CV_32FC2) to go from CV_32S to CV_32F, so you need a approxCurve.convertTo(points, CvType.CV_32SC2) to convert it back

you had a contour.convertTo(contour2f, CvType.CV_32FC2) to go from CV_32S integer to CV_32F, float points, so you need a approxCurve.convertTo(points, CvType.CV_32SC2) to convert it back