我有一个类使用颜色矩阵在 ImageView 上添加图像效果。我有几个用于对比度、曝光、温度和饱和度的颜色矩阵。 例如:
public static Bitmap changeContrast(Bitmap bmp, float contrast)
{
ColorMatrix cm = new ColorMatrix(new float[]
{
contrast, 0, 0, 0, 0,
0, contrast, 0, 0, 0,
0, 0, contrast, 0, 0,
0, 0, 0, 1, 0
});
return getBitmapFromColorMatrix(cm, bmp);
}
现在我的问题是图像的锐化。这些似乎没有颜色矩阵。请帮忙。
我尝试使用 here 中的代码锐化图像但处理时间太长,我不知道应该将哪些有效值传递给 sharpenImage(Bitmap src, double weight)
方法的权重参数。
最佳答案
可能为时已晚,但我只是想分享一种快速锐化图像的方法。
public static Bitmap doSharpen(Bitmap original, float[] radius) {
Bitmap bitmap = Bitmap.createBitmap(
original.getWidth(), original.getHeight(),
Bitmap.Config.ARGB_8888);
RenderScript rs = RenderScript.create(yourContext);
Allocation allocIn = Allocation.createFromBitmap(rs, original);
Allocation allocOut = Allocation.createFromBitmap(rs, bitmap);
ScriptIntrinsicConvolve3x3 convolution
= ScriptIntrinsicConvolve3x3.create(rs, Element.U8_4(rs));
convolution.setInput(allocIn);
convolution.setCoefficients(radius);
convolution.forEach(allocOut);
allocOut.copyTo(bitmap);
rs.destroy();
return bitmap;
}
这是我创建的 3 种不同的锐化类型:
// low
private static void loadBitmapSharp() {
float[] sharp = { -0.60f, -0.60f, -0.60f, -0.60f, 5.81f, -0.60f,
-0.60f, -0.60f, -0.60f };
//you call the method above and just paste the bitmap you want to apply it and the float of above
yourbitmap = doSharpen(getbitmap, sharp));
}
// medium
private static void loadBitmapSharp1() {
float[] sharp = { 0.0f, -1.0f, 0.0f, -1.0f, 5.0f, -1.0f, 0.0f, -1.0f,
0.0f
};
//you call the method above and just paste the bitmap you want to apply it and the float of above
yourbitmap = doSharpen(getbitmap, sharp));
}
// high
private static void loadBitmapSharp2() {
float[] sharp = { -0.15f, -0.15f, -0.15f, -0.15f, 2.2f, -0.15f, -0.15f,
-0.15f, -0.15f
};
//you call the method above and just paste the bitmap you want to apply it and the float of above
yourbitmap = doSharpen(getbitmap, sharp));
}
您也可以将它们直接应用到没有空位的位图上,它快速简单并且有很好的效果!
关于android - Android 图像锐化的颜色矩阵,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/34175032/