【Android】opencv图像处理之提取骨架

ゝ一世哀愁。 2022-07-13 08:10 227阅读 0赞

在网上找了好多股价提取的实例，有关android的，实在都不能用，最后只好动手按照书中的算法实现，记录在此。

算法参看自《数字图像处理（第三版）》Rafae C.Gonzalez, Richard E. Woods著, 阮秋琦 阮宇智 等译，  
第418页。  
![这里写图片描述][SouthEast]

代码如下

/** * 骨架 * 参考http://felix.abecassis.me/2011/09/opencv-morphological-skeleton/ * @param picture * @param picture_result */
        public static void skeleton(ImageView picture, ImageView picture_result){
            picture.setDrawingCacheEnabled(true);
            picture.buildDrawingCache();
            Bitmap bitmap = ((BitmapDrawable) picture.getDrawable()).getBitmap();
            System.loadLibrary("opencv_java3");
            Mat src = new Mat();
            Utils.bitmapToMat(bitmap, src);
            Imgproc.cvtColor(src, src, Imgproc.COLOR_BGR2GRAY);//转换成灰度图
            Imgproc.threshold(src, src, 1, 255,Imgproc.THRESH_BINARY | Imgproc.THRESH_OTSU);//阈值处理，将灰度图处理成二值图
            Mat dst = src.clone();
    
            int K = 0;//腐蚀至消失的次数
            Mat element =  Imgproc.getStructuringElement(Imgproc.MORPH_CROSS, new Size(3,3));
            Mat res = null;//骨架操作的结果
            do{
                    Mat  dst2 = new Mat();
                    Imgproc.morphologyEx(dst, dst2,  Imgproc.MORPH_OPEN, element);//图像开操作
                    Mat tmp = new Mat();
                    Core.subtract(dst, dst2, tmp);//图像减操作
                    if(res == null){
                        res = tmp;
                    }else {
                        Core.add(tmp, res, res);//图像加操作
                    }
                    K++;
                    Imgproc.erode(src, dst, element, new Point(-1, -1), K);//图像腐蚀
            }while (Core.countNonZero(dst) > 0);
    
            ConstantMorph.MY_MAT = res;//操作结果
            ConstantMorph.MY_COUNT = K;//记录下操作次数，用于骨架重构
    
            Bitmap tmpbitmap = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Bitmap.Config.ARGB_8888);
            Utils.matToBitmap(res, tmpbitmap);
            picture_result.setImageBitmap(tmpbitmap);
            picture.setDrawingCacheEnabled(false);
        }

处理结果如下图  
![这里写图片描述][SouthEast 1]

代码可以从如下地址获取  
[https://github.com/carlzhangweiwen/autumnsinger\_opencv/blob/master/app/src/main/java/com/autumnsinger/opencv/util/PictureUtils.java][https_github.com_carlzhangweiwen_autumnsinger_opencv_blob_master_app_src_main_java_com_autumnsinger_opencv_util_PictureUtils.java]

android环境opencv开发搭建过程：[Android Studio中Opencv的开发环境搭建过程][Android Studio_Opencv]

[SouthEast]: /images/20220713/bee6df1feed2471099d27a16fe2ab312.png
[SouthEast 1]: /images/20220713/bd2279a1cf7a4ef08f2f72bb8a360685.png
[https_github.com_carlzhangweiwen_autumnsinger_opencv_blob_master_app_src_main_java_com_autumnsinger_opencv_util_PictureUtils.java]: https://github.com/carlzhangweiwen/autumnsinger_opencv/blob/master/app/src/main/java/com/autumnsinger/opencv/util/PictureUtils.java
[Android Studio_Opencv]: http://blog.csdn.net/u012386311/article/details/52266762