Convert Python Into Java / Kotlin using these operations

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I'm totally new in OpenCV. Does anyone knows how to convert below Python into Java/Kotlin? Only these a bit tricky to translate it.

• Youtube: https://www.youtube.com/watch?v=tKA_H...
• Ref Source code: https://github.com/misbah4064/backgro...
• My code : https://pastebin.com/W32sgbZx

my code so far:

    fun resize(bgMat: Mat, imgMat: Mat): Mat{
        val resizeimage = Mat()
        val sz = org.opencv.core.Size(imgMat.width().toDouble(), imgMat.height().toDouble())
        resize(bgMat, resizeimage, sz,0.0 ,0.0, INTER_AREA)
        return resizeimage
    }

    var refMat = Mat()
    fun removeTheSelectedColorBackground(imgBmp: Bitmap, bgBmp: Bitmap) : Bitmap {
        val imgMat = Mat(imgBmp.getWidth(), imgBmp.getHeight(), CvType.CV_8UC1)
        Utils.bitmapToMat(imgBmp, imgMat)
        val bgMat = Mat(bgBmp.getWidth(), bgBmp.getHeight(), CvType.CV_8UC1)
        Utils.bitmapToMat(bgBmp, bgMat)

        if (isFirstTime!!) {
            isFirstTime = false
            refMat = Mat(imgBmp.getWidth(), imgBmp.getHeight(), CvType.CV_8UC1)
            Utils.bitmapToMat(imgBmp, refMat)
        }
        val updatedBgMat = resize(bgMat, refMat)
        val maskDiff1 = Mat()
        val maskDiff2 = Mat()
        subtract(imgMat, refMat, maskDiff1)
        subtract(refMat, imgMat, maskDiff2)
        val maskDiff = Mat()
        add(maskDiff1, maskDiff2, maskDiff)
        //        diff[abs(diff)<13.0]=0
        val grayMat = Mat()
        cvtColor(maskDiff, grayMat, COLOR_BGR2GRAY)

    //gray[np.abs(gray) < 10] = 0
        //fgmask = gray.astype(np.uint8)
        //fgmask[fgmask>0]=255
        //invert the mask
        //fgmask_inv = cv2.bitwise_not(fgmask)
        //use the masks to extract the relevant parts from FG and BG
        //fgimg = cv2.bitwise_and(img,img,mask = fgmask)
        //bgimg = cv2.bitwise_and(bg,bg,mask = fgmask_inv)
        //combine both the BG and the FG images
        //dst = cv2.add(bgimg,fgimg)
    }