Question

我正在为Android开发图像编辑应用。为此，我需要将我的图像转换为铅笔草图。

你可以帮助我。

Answer 1

你需要一些图像处理库才能做到这一点您可以尝试ImageJ或Marvin。

有关详细信息，请参阅此SO帖子：What is the best java image processing library/approach?

Answer 2

要将图像转换为铅笔草图，您需要应用3个过滤器

GRAYSCALE FILTER
反转颜色
GAUSSIAN BLUR

成功应用这些滤镜后，使用colordodgeblend函数制作铅笔，如草图

灰度滤镜

float[] colorMatrix_Negative = {
        -1.0f, 0, 0, 0, 255, //red   
         0, -1.0f, 0, 0, 255, //green
         0, 0, -1.0f, 0, 255, //blue
         0, 0, 0, 1.0f, 0 //alpha};
ColorMatrix colorMatrix = new ColorMatrix();
colorMatrix.set(colorMatrix_Negative);

ColorFilter colorFilter_Negative = new ColorMatrixColorFilter(colorMatrix_Negative);

代码申请反向过滤器

public static Bitmap applyGaussianBlur(Bitmap src) {

    double[][] GaussianBlurConfig = new double[][]{
            {-1, 0, -1},
            {0, 4, 0},
            {-1, 0, -1}
    };

    ConvolutionMatrix convMatrix = new ConvolutionMatrix(3);

    convMatrix.applyConfig(GaussianBlurConfig);
    convMatrix.Factor = 1;
    convMatrix.Offset = 150;
    //return out put bitmap    return ConvolutionMatrix.computeConvolution3x3(src, convMatrix);
}

GAUSSIAN BLUR的代码

with t0_t1 as (
  select 
    t.id,
    t.nm, 
    count(t1.id) as A
  from table0 t
  left join table1 t1 on t.id = t1.id
  group by t.id, t.nm
)
select t.nm, t.A, count(t2.id) as B
from t0_t1 t
left join table2 t2 on t.id = t2.id
group by t.nm, t.A

for more reference

如何在Android中将位图转换为铅笔素描？

2 个答案: