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【MediaTek X20开发板试用体验】8.MTX20开发板Android Studio+"高斯模糊"算法实现  

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xble
 xble
Level 1
注册时间:8年 前
帖子数: 15
2017年3月14日 上午9:32  

上个帖子里面实现了灰度图转换程序，本来是想实现“高斯模糊”算法只是程序一直有问题为了完成发帖就简化了程序。
“高斯模糊”算法，公式计算机图形学中有非常详细的介绍，我们这里通过EasyPR里面理解来说明一下。
平均模糊算法，就是将像素值替换为像素周围8个像素平均值的算法，如下图：
 
在平均模糊中周围像素的权值都是一样的都是1。如果周围像素的权值不一样，并且与二维的高斯分布的值一样那么就叫做高斯模糊。有兴趣的人可以自己查查什么是高斯分布值，高斯函数，权重矩阵等等知识，我们这里只是肤浅的学习概念和如何使用，有点像使用VS开发软件，我们只管知道微软提供的API如何使用就可以完成一般工作，当然搞清楚其背后的原理则是极好滴！

下面直接列出代码，只是在上个帖子的代码稍微修改而已。
MainActivity.java

  1. package com.example.gzh.myplatelocate;
  3. import android.graphics.Bitmap;
  4. import android.graphics.BitmapFactory;
  5. import android.support.v7.app.AppCompatActivity;
  6. import android.os.Bundle;
  7. import android.util.Log;
  8. import android.view.View;
  9. import android.widget.ImageView;
  10. import android.widget.TextView;
  12. import org.opencv.android.Utils;
  13. import org.opencv.core.Mat;
  17. import static org.opencv.android.OpenCVLoader.initDebug;
  18. import static org.opencv.imgproc.Imgproc.COLOR_RGB2GRAY;
  19. import static org.opencv.imgproc.Imgproc.cvtColor;
  22. public class MainActivity extends AppCompatActivity {
  23.     static String TAG = "Myplatelocate";
  24.     ImageView show_image;
  25.     Bitmap srcBitmap;
  26.     Bitmap grayBitmap;
  27.     private long mRecognizerPtr = 0;
  28.     private static boolean flag = true;
  29.     PlateRecognizer MyPlateRecognizer;
  31.     @Override
  32.     protected void onCreate(Bundle savedInstanceState) {
  33.         super.onCreate(savedInstanceState);
  34.         setContentView(R.layout.activity_main);
  36.         // Example of a call to a native method
  37.         TextView tv = (TextView) findViewById(R.id.sample_text);
  39.         MyPlateRecognizer = new PlateRecognizer(this);
  40.         tv.setText(MyPlateRecognizer.stringFromJNI());
  41.         show_image = (ImageView) findViewById(R.id.imageView);
  42.         show_image.setImageResource(R.drawable.heidfk640);
  43.         findViewById(R.id.button_normal).setOnClickListener(new View.OnClickListener() {
  44.             @Override
  45.             public void onClick(View v) {
  46.                 //恢复
  47.                 backPic();
  48.             }
  49.         });
  50.         findViewById(R.id.button_gray).setOnClickListener(new View.OnClickListener() {
  51.             @Override
  52.             public void onClick(View v) {
  53.                 //变灰
  54.                // grayPic();
  55.                 Log.i(TAG, "setOnClickListener procSrc2Gray sucess...my_SobelOper");
  56.                 procSrc2Gray();
  58.             }
  59.         });
  61.     }
  62.     private void backPic(){
  63.         show_image.setImageResource(R.drawable.heidfk640);
  64.     }
  65.     private void grayPic(){
  66.         Bitmap bmp = BitmapFactory.decodeResource(getResources(),R.drawable.heidfk640);
  67.         int w = bmp.getWidth();
  68.         int h = bmp.getHeight();
  69.         int[] pixels = new int[w*h];
  70.         bmp.getPixels(pixels, 0, w, 0, 0, w, h);
  71.         //recall JNI
  72.         int[] resultInt = MyPlateRecognizer.getGrayImage(pixels, w, h);
  73.         Bitmap resultImg = Bitmap.createBitmap(w, h, Bitmap.Config.RGB_565);
  74.         resultImg.setPixels(resultInt, 0, w, 0, 0, w, h);
  75.         show_image.setImageBitmap(resultImg);
  76.         Log.i(TAG, "procSrc2Gray sucess...11111111111");
  77.     }
  78.     public void procSrc2Gray(){
  79.         int nFalg_test = 2;
  80.         Mat rgbMat = new Mat();
  81.         Mat grayMat = new Mat();
  82.         srcBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.heidfk640);
  83.         grayBitmap = Bitmap.createBitmap(srcBitmap.getWidth(), srcBitmap.getHeight(), Bitmap.Config.RGB_565);
  84.         Utils.bitmapToMat(srcBitmap, rgbMat);//convert original bitmap to Mat, R G B.
  85.           if(nFalg_test == 1)
  86.           {
  87.               String str1 = null;
  88.               str1 = String.format("call my_CvtColor rgbMat.channels()=%d", rgbMat.channels());
  89.               Log.i(TAG, str1);
  90.               MyPlateRecognizer.my_CvtColor(rgbMat, grayMat, COLOR_RGB2GRAY);//rgbMat to gray grayMat
  91.               // Then convert the processed Mat to Bitmap
  92.               Log.i(TAG, "call my_CvtColor sucess...=2=");
  93.           }
  94.           else {
  95.               String str1 = null;
  96.               str1 = String.format("call my_SobelOper rgbMat.channels()=%d", rgbMat.channels());
  97.               Log.i(TAG, str1);
  98.               MyPlateRecognizer.my_SobelOper(rgbMat, grayMat, COLOR_RGB2GRAY);//rgbMat to gray grayMat
  99.               // Then convert the processed Mat to Bitmap
  100.               Log.i(TAG, "call my_SobelOper sucess...=2=");
  101.           }
  103.         Utils.matToBitmap(grayMat, grayBitmap);
  104.         Log.i(TAG, "procSrc2Gray sucess...=3=");
  106.         show_image.setImageBitmap(grayBitmap);
  108.         Log.i(TAG, "procSrc2Gray sucess...");
  109.     }
  110.     @Override
  111.     protected void onResume() {
  112.         super.onResume();
  113.         if (initDebug()) {
  114.             Log.i(TAG, "OpenCV initialize success");
  115.         } else {
  116.             Log.i(TAG, "OpenCV initialize failed");
  117.         }
  118.     }
  120. }

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PlateRecognizer.java

  1. package com.example.gzh.myplatelocate;
  3. import android.content.Context;
  4. import android.util.Log;
  6. import org.opencv.core.Mat;
  8. /**
  9. * Created by gzh on 17-2-12.
  10. */
  12. public class PlateRecognizer {
  13.     // Used to load the 'native-lib' library on application startup.
  14.     static String TAG = "PlateRecognizer";
  15.     static {
  16.         System.loadLibrary("native-lib");
  17.        // System.loadLibrary("opencv_java3");
  18.     }
  19.     private Context mContext;
  20.     private String mSvmpath = "svm.xml";
  21.     private String mAnnpath = "ann.xml";
  22.     private boolean mRecognizerInited = false;
  23.     private long mRecognizerPtr = 0;
  25.     public PlateRecognizer(Context context) {
  26.         mContext = context;
  27.              mRecognizerPtr = initPR();
  28.             if (0 != mRecognizerPtr) {
  29.                 mRecognizerInited = true;
  31.         }
  32.     }
  34.     public void finalize() {
  35.         uninitPR(mRecognizerPtr);
  36.         mRecognizerPtr = 0;
  37.         mRecognizerInited = false;
  38.     }
  39.     public void my_SobelOper(Mat rgbMat, Mat grayMat, int COLOR_RGB2GRAY) {
  40.         Log.i(TAG, "my_SobelOper=1=");
  41.         mySobelOper(mRecognizerPtr, rgbMat.getNativeObjAddr(), grayMat.getNativeObjAddr());//rgbMat to gray grayMat
  42.         Log.i(TAG, "my_SobelOper=2=");
  43.     }
  44.     public void my_CvtColor(Mat rgbMat, Mat grayMat, int COLOR_RGB2GRAY) {
  45.         Log.i(TAG, "my_CvtColor=1=");
  46.         myCvtColor(rgbMat.getNativeObjAddr(), grayMat.getNativeObjAddr(), COLOR_RGB2GRAY);//rgbMat to gray grayMat
  47.         Log.i(TAG, "my_CvtColor=2=");
  48.     }
  49.     /**
  50.      * A native method that is implemented by the 'native-lib' native library,
  51.      * which is packaged with this application.
  52.      */
  53.     public static native String stringFromJNI();
  55.     //public static native String validate(long matAddrGr, long matAddrRgba);
  57.     //图像处理
  58.     private static native void myCvtColor(long thiz, long inputImage, long faces);
  59.     public static native int[] getGrayImage(int[] pixels, int w, int h);
  60.     public static native long initPR();
  61.     public static native long uninitPR(long recognizerPtr);
  62.     public static native void mySobelOper(long recognizerPtr, long inputImage, long faces);
  63. }

复制代码

native-lib.cpp

  1. #include <jni.h>
  2. #include <string>
  3. #include <stdio.h>
  4. #include <iostream>
  5. #include <string>
  6. #include "opencv2/opencv.hpp"
  7. #include <stdio.h>
  8. #include <iostream>
  9. #include <string>
  10. #include "platelocate.h"
  11. #include <android/log.h>
  12. #include "platelocate.h"
  14. using namespace easypr;
  16. using namespace std;
  17. using namespace cv;
  18. int m_GaussianBlurSize = 5;
  19. int m_MorphSizeWidth   = 17;
  20. int m_MorphSizeHeight  = 3;
  21. static const int DEFAULT_GAUSSIANBLUR_SIZE = 5;
  22. static const int SOBEL_SCALE = 1;
  23. static const int SOBEL_DELTA = 0;
  24. static const int SOBEL_DDEPTH = CV_16S;
  25. static const int SOBEL_X_WEIGHT = 1;
  26. static const int SOBEL_Y_WEIGHT = 0;
  27. static const int DEFAULT_MORPH_SIZE_WIDTH = 17;  // 17
  28. static const int DEFAULT_MORPH_SIZE_HEIGHT = 3;  // 3
  31. static const int WIDTH = 136;
  32. static const int HEIGHT = 36;
  33. static const int TYPE = CV_8UC3;
  36. static const int DEFAULT_VERIFY_MIN = 1;   // 3
  37. static const int DEFAULT_VERIFY_MAX = 24;  // 20
  39. static const int DEFAULT_ANGLE = 60;  // 30
  42. static const int DEFAULT_DEBUG = 1;
  43. #define  LOG_TAG    "platelocate_native"
  44. #define  LOGI(...)  __android_log_print(ANDROID_LOG_INFO,LOG_TAG,__VA_ARGS__)
  45. #define  LOGE(...)  __android_log_print(ANDROID_LOG_ERROR,LOG_TAG,__VA_ARGS__)
  47. extern "C"
  48. char* jstring2str(JNIEnv* env, jstring jstr) {
  49.     char* rtn = NULL;
  51.     jclass clsstring = env->FindClass("java/lang/String");
  52.     jstring strencode = env->NewStringUTF("utf-8"); // "GB2312"
  53.     jmethodID mid = env->GetMethodID(clsstring, "getBytes", "(Ljava/lang/String;)[B");
  54.     jbyteArray barr = (jbyteArray) env->CallObjectMethod(jstr, mid, strencode);
  55.     jsize alen = env->GetArrayLength(barr);
  56.     jbyte* ba = env->GetByteArrayElements(barr, JNI_FALSE);
  57.     if (alen > 0) {
  58.         rtn = (char *)malloc(alen + 1);
  59.         memcpy(rtn, ba, alen);
  60.         rtn[alen] = 0;
  61.     }
  62.     env->ReleaseByteArrayElements(barr, ba, 0);
  63.     return rtn;
  64. }
  65. extern "C"
  66. jstring
  67. Java_com_example_gzh_myplatelocate_PlateRecognizer_stringFromJNI(
  68.         JNIEnv *env,
  69.         jobject /* this */) {
  70.     std::string hello = "Hello from C++ NDK 11111111111111";
  71.     LOGE("== Hello from C++ NDK 11111111111111");
  73.     return env->NewStringUTF(hello.c_str());
  74. }
  75. extern "C"
  76. JNIEXPORT jlong JNICALL
  77. Java_com_example_gzh_myplatelocate_PlateRecognizer_initPR(
  78.         JNIEnv *env, 
  79.         jobject) {
  80. //        const string *svm = (*env)->GetStringUTFChars(env, svmpath, 0);
  81. //        const string *ann = (*env)->GetStringUTFChars(env, annpath, 0);
  84.     CPlateLocate *pr = new CPlateLocate();
  87.     return (jlong)pr;
  88. }
  89. extern "C"
  90. JNIEXPORT jlong JNICALL
  91. Java_com_example_gzh_myplatelocate_PlateRecognizer_uninitPR(
  92.         JNIEnv *env,
  93.         jobject,
  94.         jlong recognizerPtr
  95.         )
  96. {
  97.     LOGE("== Java_com_example_gzh_myplatelocate_PlateRecognizer_uninitPR");
  98.     CPlateLocate *pr = (CPlateLocate *)recognizerPtr;
  99.     delete pr;
  101.     return 0;
  102. }
  103. #if 0
  104. extern "C"
  105. JNIEXPORT void JNICALL
  106. Java_com_example_gzh_myplatelocate_PlateRecognizer_mySobelOper
  107.         (JNIEnv * jenv,
  108.          jlong thiz,
  109.          jlong recognizerPtr,
  110.          jlong imageGray, jlong faces)
  111. {
  113.     Mat imgData_out;
  116.     Mat& mGr  = *(Mat*)imageGray;
  117.     Mat& mRgb = *(Mat*)faces;
  119.     LOGE("=1= Java_com_example_gzh_myplatelocate_PlateRecognizer_mySobelOper");
  120. LOGE("=2= mGr.cols=%d", mGr.cols);
  121. LOGE("=2= mGr.rows=%d", mGr.rows);
  122. LOGE("=2= mGr.dims=%d", mGr.dims);
  123. LOGE("=2= mGr.channels=%d", mGr.channels());
  124. //    cv:cvtColor(mGr, mRgb, CV_RGB2GRAY);
  125.     //mRgb = mRgb /255.0;
  126.     CPlateLocate *pr = (CPlateLocate *)recognizerPtr;
  127. #if 1
  128.     pr->sobelOper(mGr, imgData_out, m_GaussianBlurSize, m_MorphSizeWidth,m_MorphSizeHeight);
  129. #else
  130.     #if 1
  131.         pr->cvtgray(mGr, mRgb, CV_RGB2GRAY);
  132.     #else
  133.         cv:cvtColor(mGr, mRgb, CV_RGB2GRAY);
  134.     #endif
  135. #endif
  136. LOGE("=2= imgData_out.cols=%d", imgData_out.cols);
  137. LOGE("=2= imgData_out.rows=%d", imgData_out.rows);
  138. imgData_out.dims = 0;
  139. LOGE("=2= imgData_out.dims=%d", imgData_out.dims);
  140. LOGE("=2= imgData_out.channels=%d", imgData_out.channels());
  141. // imgData_out = imgData_out / 255.0;
  142. //   imgData_out.copyTo(*hist);
  144.     LOGE("=3= imgData_outJava_com_example_gzh_myplatelocate_PlateRecognizer_mySobelOper");
  145. }
  146. #else
  147. extern "C"
  148. JNIEXPORT void JNICALL
  149. Java_com_example_gzh_myplatelocate_PlateRecognizer_mySobelOper
  150.         (JNIEnv * jenv,
  151.          jlong thiz,
  152.          jlong recognizerPtr,
  153.          jlong imageGray, jlong faces)
  154. {
  156.     Mat imgData;
  157.     Mat imgData_out;
  159.     Mat *hist = new Mat();
  160.     Mat& mGr  = *(Mat*)imageGray;
  161.     Mat& mRgb = *(Mat*)faces;
  162.   //  hist = &imgData_out;
  163.     LOGE("=1= Java_com_example_gzh_myplatelocate_PlateRecognizer_mySobelOper");
  164.     LOGE("=2= mGr.cols=%d", mGr.cols);
  165.     LOGE("=2= mGr.rows=%d", mGr.rows);
  166.     LOGE("=2= mGr.dims=%d", mGr.dims);
  167.     LOGE("=2= mGr.channels=%d", mGr.channels());
  168. //    cv:cvtColor(mGr, mRgb, CV_RGB2GRAY);
  169.     //mRgb = mRgb /255.0;
  170.    // CPlateLocate *pr = (CPlateLocate *)recognizerPtr;
  171.    // pr->sobelOper(mGr, imgData_out, m_GaussianBlurSize, m_MorphSizeWidth,m_MorphSizeHeight);
  172.     Mat mat_blur;
  173.     LOGE("=1= sobelOper");
  174.     mat_blur = mGr.clone();
  175.     GaussianBlur(mGr, mat_blur, Size(m_GaussianBlurSize, m_GaussianBlurSize), 0, 0, BORDER_DEFAULT);
  176.     LOGE("=2= sobelOper mat_blur.channels()=%d", mat_blur.channels());
  178.     Mat mat_gray;
  179.     if (mat_blur.channels() == 3 || mat_blur.channels() == 4)
  180.         cvtColor(mat_blur, mat_gray, CV_RGB2GRAY);
  181.     else if(mat_blur.channels() == 42)
  182.     {
  183.         mat_blur.convertTo(mat_gray, SOBEL_DDEPTH);
  184.     }
  185.     else
  186.         mat_gray = mat_blur;
  187.     LOGE("=3= sobelOper");
  189.     int scale = SOBEL_SCALE;
  190.     int delta = SOBEL_DELTA;
  191.     int ddepth = SOBEL_DDEPTH;
  193.     Mat grad_x, grad_y;
  194.     Mat abs_grad_x, abs_grad_y;
  195.     LOGE("=444= sobelOper");
  197. #if 1
  198.     Sobel(mat_gray, grad_x, ddepth, 1, 0, 3, scale, delta, BORDER_DEFAULT);
  200.     convertScaleAbs(grad_x, abs_grad_x);
  201.     LOGE("=5= sobelOper");
  203.     Mat grad;
  204.     addWeighted(abs_grad_x, SOBEL_X_WEIGHT, 0, 0, 0, grad);
  206.     Mat mat_threshold;
  207.     double otsu_thresh_val = threshold(grad, mat_threshold, 0, 255, CV_THRESH_OTSU + CV_THRESH_BINARY);
  209.     LOGE("=6= sobelOper");
  211.     Mat element = getStructuringElement(MORPH_RECT, Size(m_MorphSizeWidth, m_MorphSizeHeight));
  212.     morphologyEx(mat_threshold, mat_threshold, MORPH_CLOSE, element);
  214.     mRgb = mat_threshold;
  215. #else
  216.     mRgb = mat_gray;
  218. #endif
  219.     LOGE("=71= sobelOper");
  220.    // faces = (jlong)hist;
  221.     LOGE("=3= imgData_outJava_com_example_gzh_myplatelocate_PlateRecognizer_mySobelOper");
  222. }
  223. #endif
  225. extern "C"
  226. JNIEXPORT void JNICALL
  227. Java_com_example_gzh_myplatelocate_PlateRecognizer_myCvtColor
  228.         (JNIEnv * jenv,
  229.          jlong thiz,
  230.          jlong imageGray, jlong faces)
  231. {
  232.     Mat imgData;
  233.     Mat imgData_out;
  234.     Mat *hist = new Mat();
  235.     imgData = *((Mat*)imageGray);
  236.     Mat& mGr  = *(Mat*)imageGray;
  237.     Mat& mRgb = *(Mat*)faces;
  238.     LOGE("== Java_com_example_gzh_myplatelocate_PlateRecognizer_myCvtColor");
  239.     LOGE("=myCvtColor= mGr.channels=%d", mGr.channels());
  240.     cv:cvtColor(mGr, mRgb, CV_RGB2GRAY);
  241.    // mRgb = mRgb /255.0;
  242.     LOGE("== Java_com_example_gzh_myplatelocate_PlateRecognizer_myCvtColor");
  244. }
  245. extern "C"
  246. JNIEXPORT jintArray JNICALL
  247. Java_com_example_gzh_myplatelocate_PlateRecognizer_getGrayImage(
  248.                 JNIEnv *env,
  249.                 jobject /* this */,
  250.                 jintArray pixels_,
  251.                 jint w,
  252.                 jint h
  253.                 ) {
  254.     jint *pixels = env->GetIntArrayElements(pixels_, NULL);
  255.     // TODO
  256.     if(pixels==NULL){
  257.         return NULL;
  258.     }
  259.     cv::Mat imgData(h, w, CV_8UC4, pixels);
  260.     uchar *ptr = imgData.ptr(0);
  261.     for (int i = 0; i < w * h; i++) {
  262.         int grayScale = (int) (ptr[4 * i + 2] * 0.299 + ptr[4 * i + 1] * 0.587
  263.                                + ptr[4 * i + 0] * 0.114);
  264.         ptr[4 * i + 1] = (uchar) grayScale;
  265.         ptr[4 * i + 2] = (uchar) grayScale;
  266.         ptr[4 * i + 0] = (uchar) grayScale;
  267.     }
  269.     int size = w * h;
  270.     jintArray result = env->NewIntArray(size);
  271.     env->SetIntArrayRegion(result, 0, size, pixels);
  272.     env->ReleaseIntArrayElements(pixels_, pixels, 0);
  273.     return result;
  274. }

复制代码

运行结果如下图：
 
附件是ubuntu系统的高斯模糊实现。


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