Fast Bitmap Blur For Android SDK

Question

Currently in an Android application that I\'m developing I\'m looping through the pixels of an image to blur it. This takes about 30 seconds on a 640x480 image.

W

Answer 1

I used this before..

public static Bitmap myblur(Bitmap image, Context context) {
            final float BITMAP_SCALE = 0.4f;
            final float BLUR_RADIUS = 7.5f;
            int width = Math.round(image.getWidth() * BITMAP_SCALE);
            int height = Math.round(image.getHeight() * BITMAP_SCALE);
            Bitmap inputBitmap = Bitmap.createScaledBitmap(image, width, height, false);
            Bitmap outputBitmap = Bitmap.createBitmap(inputBitmap);
            RenderScript rs = RenderScript.create(context);
            ScriptIntrinsicBlur theIntrinsic = ScriptIntrinsicBlur.create(rs, Element.U8_4(rs));
            Allocation tmpIn = Allocation.createFromBitmap(rs, inputBitmap);
            Allocation tmpOut = Allocation.createFromBitmap(rs, outputBitmap);
            theIntrinsic.setRadius(BLUR_RADIUS);
            theIntrinsic.setInput(tmpIn);
            theIntrinsic.forEach(tmpOut);
            tmpOut.copyTo(outputBitmap);
            return outputBitmap;
        }