过滤图像的android？ [英] Filter images android?

问题描述

我用这个算法在Andriod的过滤图像。

I'm using this algorithm to filter images in andriod.

HTTP：//xjaphx.word press.com / 2011/06/22 /图像处理卷积矩阵/

但图像并不如预期，在哪里可以找到其他的方式来做到这一点。您将看到应用程序已经做到这一点，使得它速度快，这种算法是太慢。

But the images are not as expected, where I can find other ways to do this. You see that applications already do this, makes it fast, this algorithm is way too slow.

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推荐答案

我最近公布有你试过code更快的版本，你应该给它一个尝试。

I recently posted there a faster version of the code you tried, you should give it a try.

顺便说一句，你有什么用句意思的图像并不如预期的？也许你只是使用了错误的矩阵;你可以找到一些矩阵例如这里 。

By the way, what do you mean with the sentence images are not as expected ? Maybe you're just using a wrong matrix; you can find some matrix example here.

下面是您所要求的样品。如果您不需要缩放/偏移像素的颜色，你应该添加回旋不同的实现没有这些参数和相关的不必要的计算。

Here is the sample you requested. If you don't need to scale / offset pixel colors, you should add different implementations of convolute without those parameters and the related unnecessary computations.

class Convolution {

    private static Bitmap convolute(Bitmap bmp, Matrix mat, float factor, int offset) {
    /* ... */
    }

    private static Matrix getEdgeEnhanceMatrix() {
        Matrix m = new Matrix();
        m.setValues(new float[] {
                0, 0, 0,
                -1, 1, 0,
                0, 0, 0
        });
        return m;
    }

    // the simple way
    public static Bitmap edgeEnhance1(Bitmap bmp) {
        return convolute(bmp, getEdgeEnhanceMatrix(), 1f, 0);
    }

    // if you want to apply filter to border pixels
    // warning: really memory consuming
    public static Bitmap edgeEnhance2(Bitmap bmp, int bgColor) {
        // create a bigger canvas
        Bitmap bigger = Bitmap.createBitmap(bmp.getWidth() + 2, bmp.getHeight() + 2, bmp.getConfig());
        Canvas cBigger = new Canvas(bigger);
        // paint background
        cBigger.drawColor(bgColor);
        // draw the bmp you want to manipulate from (1,1)
        cBigger.drawBitmap(bmp, 1, 1, null);
        // compute convolution
        bigger = convolute(bigger, getEdgeEnhanceMatrix(), 1f, 0);

        // create the result and project the convolution at (-1,-1)
        Bitmap rt = Bitmap.createBitmap(bmp.getWidth(), bmp.getHeight(), bmp.getConfig());
        Canvas cRt = new Canvas(rt);
        cRt.drawBitmap(bigger, -1, -1, null);

        return rt;
    }
}

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