gistfile1.txt

    fun drawBoxesOnTheImage2(img: Mat) {
        val gray = Mat()
        val blur = Mat()
        val thresh = Mat()
        Imgproc.cvtColor(img, gray, Imgproc.COLOR_BGR2GRAY)
        Imgproc.medianBlur(gray, blur, 11)
        Imgproc.threshold(blur, thresh, 0.0, 255.0, Imgproc.THRESH_BINARY + Imgproc.THRESH_OTSU)
        
        val opening = Mat()
        val kernel = Imgproc.getStructuringElement(Imgproc.MORPH_ELLIPSE, Size(5.0,5.0))
        Imgproc.morphologyEx(thresh, kernel, Imgproc.MORPH_OPEN, opening)

        val hierarchy = Mat()
        val contours = arrayListOf<MatOfPoint>()

        Imgproc.findContours(
            opening,
            contours,
            hierarchy,
            Imgproc.RETR_EXTERNAL,
            Imgproc.CHAIN_APPROX_SIMPLE
        )

        if(contours.size == 0) return

        var cnts = contours[0].toArray()

        if (contours.size > 2) {
            cnts = contours[1].toArray()
        }

        for (c in cnts) {
            val matOfPoint = MatOfPoint2f(c)
            val peri = Imgproc.arcLength(matOfPoint, true)
            if (peri > 0) {
                println("peri $peri")
            }
            val approx = MatOfPoint2f()
            val area = Imgproc.contourArea(matOfPoint)
            Imgproc.approxPolyDP(matOfPoint, approx, 0.04 * peri, true)
            if (approx.toArray().size > 5 && area > 1000 && area < 500000) {
                val center = Point()
                val radius = FloatArray(1)
                Imgproc.minEnclosingCircle(matOfPoint, center, radius)
                Imgproc.circle(img, center, radius[0].toInt(), Scalar(0.0, 0.0, 255.0), 1)
            }
        }
    }