NoiseRemover in Android

NoiseRemover in Android

import android.graphics.Bitmap;

public class NoiseRemover {

    // Function to remove noise from image
    public static Bitmap removeNoise(Bitmap bitmap) {
        // Define the size of the kernel for the filter
        int kernelSize = 3;
        // Define the threshold for the filter
        int threshold = 50;

        // Create a new bitmap to store the filtered image
        Bitmap filteredBitmap = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), bitmap.getConfig());

        // Apply the filter to each pixel in the image
        for (int i = kernelSize; i < bitmap.getWidth() - kernelSize; i++) {
            for (int j = kernelSize; j < bitmap.getHeight() - kernelSize; j++) {
                // Get the color of the current pixel and its neighbors
                int pixel = bitmap.getPixel(i, j);
                int neighbor1 = bitmap.getPixel(i - 1, j - 1);
                int neighbor2 = bitmap.getPixel(i - 1, j);
                int neighbor3 = bitmap.getPixel(i - 1, j + 1);
                int neighbor4 = bitmap.getPixel(i, j - 1);
                int neighbor5 = bitmap.getPixel(i, j + 1);
                int neighbor6 = bitmap.getPixel(i + 1, j - 1);
                int neighbor7 = bitmap.getPixel(i + 1, j);
                int neighbor8 = bitmap.getPixel(i + 1, j + 1);

                // Calculate the average color of the neighbors
                int avgNeighborColor = (neighbor1 + neighbor2 + neighbor3 + neighbor4 +
                                        neighbor5 + neighbor6 + neighbor7 + neighbor8) / 8;

                // Calculate the difference between the current pixel and the average neighbor color
                int colorDiff = Math.abs(pixel - avgNeighborColor);

                // If the color difference is above the threshold, set the current pixel to the average neighbor color
                if (colorDiff > threshold) {
                    filteredBitmap.setPixel(i, j, avgNeighborColor);
                } else {
                    filteredBitmap.setPixel(i, j, pixel);
                }
            }
        }

        return filteredBitmap;
    }
}