如何提高在Android的一个形象？

问题描述

我要锐化图像，我的code为如下：

I want to sharpen a image, my code is given below:

 public Bitmap RuiHuaBitmap(Bitmap bitmap) {
    int width, height;
    height = bitmap.getHeight();
    width = bitmap.getWidth();
    int red, green, blue;
    int a1, a2, a3, a4, a5, a6, a7, a8, a9;
    Bitmap bmpBlurred = Bitmap.createBitmap(width, height,bitmap.getConfig());

    Canvas canvas = new Canvas(bmpBlurred);

    canvas.drawBitmap(bitmap, 0, 0, null);
    for (int i = 1; i < width - 1; i++) {
        for (int j = 1; j < height - 1; j++) {

            a1 = bitmap.getPixel(i - 1, j - 1);
            a2 = bitmap.getPixel(i - 1, j);
            a3 = bitmap.getPixel(i - 1, j + 1);
            a4 = bitmap.getPixel(i, j - 1);
            a5 = bitmap.getPixel(i, j);
            a6 = bitmap.getPixel(i, j + 1);
            a7 = bitmap.getPixel(i + 1, j - 1);
            a8 = bitmap.getPixel(i + 1, j);
            a9 = bitmap.getPixel(i + 1, j + 1);

            red = (Color.red(a1) + Color.red(a2) + Color.red(a3) + Color.red(a4) + Color.red(a6) + Color.red(a7) + Color.red(a8) + Color.red(a9)) *(-1)   + Color.red(a5)*9 ;
            green = (Color.green(a1) + Color.green(a2) + Color.green(a3) + Color.green(a4) + Color.green(a6) + Color.green(a7) + Color.green(a8) + Color.green(a9)) *(-1)  + Color.green(a5)*9 ;
            blue = (Color.blue(a1) + Color.blue(a2) + Color.blue(a3) + Color.blue(a4) + Color.blue(a6) + Color.blue(a7) + Color.blue(a8) + Color.blue(a9)) *(-1)   + Color.blue(a5)*9 ;

            bmpBlurred.setPixel(i, j, Color.rgb(red, green, blue));
        }
    }
    return bmpBlurred;
}

但我不能得到理想的效果。有人可以给更多的线索，或者告诉我什么是错在我的code？

but I cannot get the ideal effect. Can someone give more clue, or tell me what is mistake in my code?

感谢你。

推荐答案

您缺少转嫁到Color.rgb RGB值范围检查（）;你需要调用Color.rgb前正常化在[0..255]范围内的RGB值（）方法：

You are missing range checking on the rgb values passed to Color.rgb(); you need to normalize rgb values in the [0..255] range before calling Color.rgb() method:

公共静态INT RGB（INT红色，诠释绿色，诠释蓝）自：API级别  1

返回一个颜色-INT由红，绿，蓝分量。阿尔法  组分是含蓄255（完全不透明）。这些元件值  应该是[0..255]，但是没有进行范围检查，因此，如果他们  超出范围，则返回的颜色是不确定的。参数红色红  色泽绿青分量的组成部分[0..255] [0..255]的  颜色蓝色蓝色分量[0..255]颜色

Return a color-int from red, green, blue components. The alpha component is implicity 255 (fully opaque). These component values should be [0..255], but there is no range check performed, so if they are out of range, the returned color is undefined. Parameters red Red component [0..255] of the color green Green component [0..255] of the color blue Blue component [0..255] of the color

您卷积矩阵似乎是很好的一个残废转变：

Your convolution matrix seems good for a shapen transformation:

 0  0  0  0  0  
 0 -1 -1 -1  0
 0 -1  9 -1  0
 0 -1 -1 -1  0 
 0  0  0  0  0

如果你认为你的效果是太强大了，你也可以尝试使用：

if you think your effect is too strong, you could also try with:

 0  0  0  0  0  
 0  0 -1  0  0
 0 -1  5 -1  0
 0  0 -1  0  0 
 0  0  0  0  0

作为替代

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