Find the dominant color in the camera frame in OpenCV Android

I want to get the dominant color in an Android CvCameraViewFrame object. For this, I use the following OpenCV code for Android. This code is converted from OpenCV C ++ code to OpenCV code for Android. In the following code, I look at all the pixels in the camera frame and find the color of each pixel and save them in the HashMap to find the dominant color at the end of the loop. It takes about 30 seconds to go through each pixel. This is unacceptable to me. Can someone please review this code and tell me how I can find the dominant color in the camera frame.

private String[] colors = {"cBLACK", "cWHITE", "cGREY", "cRED", "cORANGE", "cYELLOW", "cGREEN", "cAQUA", "cBLUE", "cPURPLE", "cPINK", "cRED"};

public Mat onCameraFrame(CvCameraViewFrame inputFrame) {
        mRgba = inputFrame.rgba();

        if (mIsColorSelected) {
            Imgproc.cvtColor(mRgba, mRgba, Imgproc.COLOR_BGR2HSV);

            int h = mRgba.height();             // Pixel height
            int w = mRgba.width();              // Pixel width
            int rowSize = (int)mRgba.step1();       // Size of row in bytes, including extra padding

            float initialConfidence = 1.0f;

            Map<String, Integer> tallyColors = new HashMap<String, Integer>();

            byte[] pixelsTotal = new byte[h*rowSize];
            mRgba.get(0,0,pixelsTotal);

            //This for loop takes about 30 seconds to process for my camera frame
            for (int y=0; y<h; y++) {
                for (int x=0; x<w; x++) {
                    // Get the HSV pixel components

                    int hVal = (int)pixelsTotal[(y*rowSize) + x + 0];   // Hue
                    int sVal = (int)pixelsTotal[(y*rowSize) + x + 1];   // Saturation
                    int vVal = (int)pixelsTotal[(y*rowSize) + x + 2];   // Value (Brightness)


                    // Determine what type of color the HSV pixel is.
                    String ctype = getPixelColorType(hVal, sVal, vVal);
                    // Keep count of these colors.
                    int totalNum = 0;
                    try{
                        totalNum = tallyColors.get(ctype);
                    } catch(Exception ex){
                        totalNum = 0;
                    }
                    totalNum++;
                    tallyColors.put(ctype, totalNum);
                }
            }

            int tallyMaxIndex = 0;
            int tallyMaxCount = -1;
            int pixels = w * h;
            for (int i=0; i<colors.length; i++) {
                String v = colors[i];
                int pixCount;
                try{
                    pixCount = tallyColors.get(v);
                } catch(Exception e){
                    pixCount = 0;
                }
                Log.i(TAG, v + " - " + (pixCount*100/pixels) + "%, ");
                if (pixCount > tallyMaxCount) {
                    tallyMaxCount = pixCount;
                    tallyMaxIndex = i;
                }
            }
            float percentage = initialConfidence * (tallyMaxCount * 100 / pixels);
            Log.i(TAG, "Color of currency note: " + colors[tallyMaxIndex] + " (" + percentage + "% confidence).");

        }

        return mRgba;
    }

    private String getPixelColorType(int H, int S, int V)
    {
        String color;
        if (V < 75)
            color = "cBLACK";
        else if (V > 190 && S < 27)
            color = "cWHITE";
        else if (S < 53 && V < 185)
            color = "cGREY";
        else {  // Is a color
            if (H < 14)
                color = "cRED";
            else if (H < 25)
                color = "cORANGE";
            else if (H < 34)
                color = "cYELLOW";
            else if (H < 73)
                color = "cGREEN";
            else if (H < 102)
                color = "cAQUA";
            else if (H < 127)
                color = "cBLUE";
            else if (H < 149)
                color = "cPURPLE";
            else if (H < 175)
                color = "cPINK";
            else    // full circle 
                color = "cRED"; // back to Red
        }
        return color;
    }

Many thanks.