이미지에 Sharpen 적용하기

float[] matrix_sharpen = { 0, -1, 0, -1, 5, -1, 0, -1, 0};
 
private Bitmap createBitmap_convolve(Bitmap src, float[] coefficients) {
    Bitmap result = Bitmap.createBitmap(src.getWidth(), src.getHeight(), src.getConfig());
    RenderScript renderScript = RenderScript.create(getActivity());
    Allocation input = Allocation.createFromBitmap(renderScript, src);
    Allocation output = Allocation.createFromBitmap(renderScript, result);
 
    ScriptIntrinsicConvolve3x3 convolution = ScriptIntrinsicConvolve3x3.create(renderScript, Element.U8_4(renderScript));
    convolution.setInput(input);
    convolution.setCoefficients(coefficients);
    convolution.forEach(output);
    output.copyTo(result);
    renderScript.destroy();
    return result;
}

Bitmap bitmapOriginal, bitmapSharpen;
 
bitmapOriginal = BitmapFactory.decodeResource(getResources(), R.drawable.img1);
imageA1 = (ImageView) findViewById(R.id.imagea1);
 
bitmapSharpen = createBitmap_convolve(bitmapOriginal, matrix_sharpen);
imageA1.setImageBitmap(bitmapSharpen);

오리지널 비트맵을 convolve 메소드를 이용하여 Sharpen 적용