利用OPENCV为android开发畸变校正的JNI库

需要为项目提供一套畸变校正的算法，由于需要大量的矩阵运算，考虑到效率和适时性，使用JNI开发，希望把有关数组短阵的处理的变换全部放入C语言中处理。

主要用于android移动端，大致的数据来源一是从camera直接读取YUV数据，一种是从第三方接读取RGB数据，另一种是直接对BITMAP进行处理。

1.考虑到硬件设备接口，第三方软件接口，图像接口，OPENCV接口，希望能够开发出通用的算法库，一劳永逸的解决各种复杂的使用场景，因此数据要支持YUV，支持ARGB，支持MAT

2android对BITMAP有获取像素点的操作，也有通过象素点生成BITMAP的操作，而且有很多图像处理接口和第三方可以处理RGB矩阵，如

bm.getPixels(pixs, 0, w, 0, 0, w, h);
int[] pixs1 = new int[w*h]; 
        final Bitmap bm2 = Bitmap.createBitmap(pixs1, w, h, Bitmap.Config.ARGB_8888);

因此设计如下接口，入口为ARGB的整型，输出也是整型

public static native boolean RgbaUndistort(int[] argb, int width, int height, int[] pixels);

3考虑到有些情况需要二维数组，

public static native boolean RgbaUndistort2(int[][] rgb, int width, int height, int[] pixels);

4考虑到OPENCV的MAT结构，由于MAT有matToBitmap可以直接转化为BITMAP，应用MAT 提供

public static native boolean RgbaUndistortMat(int[] argb, int width, int height, long pArgbOutMatAddr);

5考虑到第三方使用MAT的情况，因此输入也可以支持MAT因此设计接口

public static native boolean RgbMatUndistortMat(long pArgbMatAddr, int width, int height, long pArgbOutMatAddr);

6考虑到摄像头输出YUV，提供YUV数据处理， 一个输出RGB， 一个输出MAT

public static native boolean YuvNv21UndistortRgba(byte[] YuvNv21, int width, int height, int[] pixels);
public static native boolean YuvNv21UndistortRgbaMat(byte[] YuvNv21, int width, int height, long pMatAddr);

7考虑到可能有不需要畸变的场合，为YUV设计一个灰度，一个RGB接口

public static native boolean YuvNv21ToGray(byte[] YuvNv21,int width, int height,  int[] pixels);
public static native boolean YuvNv21ToRGBA(byte[] YuvNv21, int width, int height, int[] pixels);

8于是编写简单的JAVA头源生类

public class ImageProc3 {static {System.loadLibrary("ImgProc3");}public static native boolean YuvNv21ToGray(byte[] YuvNv21,int width, int height,  int[] pixels);public static native boolean YuvNv21ToRGBA(byte[] YuvNv21, int width, int height, int[] pixels);public static native boolean RgbaUndistort(int[] argb, int width, int height, int[] pixels);public static native boolean RgbaUndistort2(int[][] rgb, int width, int height, int[] pixels);public static native boolean RgbaUndistortMat(int[] argb, int width, int height, long pArgbOutMatAddr);public static native boolean RgbMatUndistortMat(long pArgbMatAddr, int width, int height, long pArgbOutMatAddr);public static native boolean YuvNv21UndistortRgba(byte[] YuvNv21, int width, int height, int[] pixels);public static native boolean YuvNv21UndistortRgbaMat(byte[] YuvNv21, int width, int height, long pMatAddr);}

进入BIN目录的classes文件夹使用java -classpath . -jni 生成C头文件

根据头文件编写实现的C代码

#include <stdio.h>#include <jni.h>#include<Android/log.h>#include <opencv2/core/core.hpp>#include <opencv2/highgui/highgui.hpp>#include <opencv2/imgproc/imgproc.hpp>using namespace std;using namespace cv;#define TAG    "Camera XXXXX" // 锟斤拷锟斤拷锟斤拷远锟斤拷锟斤拷LOG锟侥憋拷识#define LOGD(...)  __android_log_print(ANDROID_LOG_DEBUG,TAG,__VA_ARGS__) // 锟斤拷锟斤拷LOGD锟斤拷锟斤拷#ifdef __cplusplusextern "C" {#endif/* * Class:     ImgProc_ImageProc3 * Method:    YuvNv21ToGray * Signature: ([BII[I)Z */JNIEXPORT jboolean JNICALL Java_ImgProc_ImageProc3_YuvNv21ToGray  (JNIEnv *jenv, jclass jclassz, jbyteArray YuvNv21, jint width, jint height, jintArray pixels){jbyte * pNV21FrameData = jenv->GetByteArrayElements(YuvNv21, 0);jint * poutPixels = jenv->GetIntArrayElements(pixels, 0);Mat mNV(height, width, CV_8UC1, (unsigned char*) pNV21FrameData);Mat mBgra(height, width, CV_8UC4, (unsigned char*) poutPixels);cvtColor(mNV, mBgra, CV_YUV420sp2RGBA);jenv->ReleaseByteArrayElements(YuvNv21, pNV21FrameData, 0);jenv->ReleaseIntArrayElements(pixels, poutPixels, 0);    return true;}/* * Class:     ImgProc_ImageProc3 * Method:    YuvNv21ToRGBA * Signature: ([BII[I)Z */JNIEXPORT jboolean JNICALL Java_ImgProc_ImageProc3_YuvNv21ToRGBA  (JNIEnv *jenv, jclass jclassz, jbyteArray YuvNv21, jint width, jint height, jintArray pixels){jbyte * pBuf = (jbyte*) jenv->GetByteArrayElements(YuvNv21, 0);jint * poutPixels = jenv->GetIntArrayElements(pixels, 0);Mat image(height + height / 2, width, CV_8UC1, (unsigned char *) pBuf);Mat rgba(height, width, CV_8UC4, (unsigned char*) poutPixels);Mat tmp(height, width, CV_8UC4);cvtColor(image, tmp, CV_YUV420sp2RGBA);vector <Mat> channels;split(tmp, channels);Mat r = channels.at(0);Mat g = channels.at(1);Mat b = channels.at(2);Mat a = channels.at(3);vector <Mat> mbgr(4);mbgr[0] = b;mbgr[1] = g;mbgr[2] = r;mbgr[3] = a;merge(mbgr, rgba);jenv->ReleaseByteArrayElements(YuvNv21, pBuf, 0);jenv->ReleaseIntArrayElements(pixels, poutPixels, 0);return true;}/* * Class:     ImgProc_ImageProc3 * Method:    RgbaUndistort * Signature: ([III[I)Z */JNIEXPORT jboolean JNICALL Java_ImgProc_ImageProc3_RgbaUndistort  (JNIEnv *jenv, jclass jclassz, jintArray argb, jint width, jint height, jintArray pixels){jint * poutPixels = jenv->GetIntArrayElements(pixels, 0);jint * pinPixels = jenv->GetIntArrayElements(argb, 0);Mat out(height, width, CV_8UC4, (unsigned char*) poutPixels);Mat in(height, width, CV_8UC4, (unsigned char*) pinPixels);double cam[] = {width, 0, width / 2, 0, height, height / 2, 0, 0, 1 };double distort[] = { 0.1, 0.35, 0.0, 0.0, 0.01 };Mat camMat = Mat(3, 3, CV_64FC1, cam);Mat disMat = Mat(5, 1, CV_64FC1, distort);undistort(in, out, camMat, disMat);jenv->ReleaseIntArrayElements(argb, pinPixels, 0);jenv->ReleaseIntArrayElements(pixels, poutPixels, 0);return true;}/* * Class:     ImgProc_ImageProc3 * Method:    RgbaUndistort2 * Signature: ([[III[I)Z */JNIEXPORT jboolean JNICALL Java_ImgProc_ImageProc3_RgbaUndistort2(JNIEnv *jenv,jclass jclassz, jobjectArray argb, jint width, jint height,jintArray pixels) {jint i, j;int row = jenv->GetArrayLength(argb);jintArray myarray = (jintArray)(jenv->GetObjectArrayElement(argb, 0));int col = jenv->GetArrayLength(myarray);jint jniData[row][col];LOGD("jiaXXX %s", "Java_ImgProc_ImageProc_convertRGB3");for (i = 0; i < row; i++) {myarray = (jintArray)(jenv->GetObjectArrayElement(argb, i));jint *coldata = jenv->GetIntArrayElements(myarray, 0);for (j = 0; j < col; j++) {jniData[i][j] = coldata[j];LOGD("jiaXXX %d", jniData[i][j]);}jenv->ReleaseIntArrayElements(myarray, coldata, 0);}Mat img = Mat(row, col, CV_8UC4, jniData);LOGD("jiaXXX  %x", img.at<unsigned int>(1, 1));double cam[] = {width, 0, width / 2, 0, height, height / 2, 0, 0, 1 };double distort[] = { 0.1, 0.35, 0.0, 0.0, 0.01 };Mat camMat = Mat(3, 3, CV_64FC1, cam);Mat disMat = Mat(5, 1, CV_64FC1, distort);jint * poutPixels = jenv->GetIntArrayElements(pixels, 0);Mat out(height, width, CV_8UC4, (unsigned char*) poutPixels);undistort(img, out, camMat, disMat);jenv->ReleaseIntArrayElements(pixels, poutPixels, 0);return true;}/* * Class:     ImgProc_ImageProc3 * Method:    RgbaUndistortMat * Signature: ([IIIJ)Z */JNIEXPORT jboolean JNICALL Java_ImgProc_ImageProc3_RgbaUndistortMat  (JNIEnv *jenv, jclass jclassz, jintArray argb, jint width, jint height, jlong pArgbOutMatAddr){//jint * poutPixels = jenv->GetIntArrayElements(pixels, 0);jint * pinPixels = jenv->GetIntArrayElements(argb, 0);//Mat out(height, width, CV_8UC4, (unsigned char*) poutPixels);Mat in(height, width, CV_8UC4, (unsigned char*) pinPixels);Mat out = *((Mat*)pArgbOutMatAddr);double cam[] = {width, 0, width / 2, 0, height, height / 2, 0, 0, 1 };double distort[] = { 0.1, 0.35, 0.0, 0.0, 0.01 };Mat camMat = Mat(3, 3, CV_64FC1, cam);Mat disMat = Mat(5, 1, CV_64FC1, distort);undistort(in, out, camMat, disMat);jenv->ReleaseIntArrayElements(argb, pinPixels, 0);//jenv->ReleaseIntArrayElements(pixels, poutPixels, 0);return true;}/* * Class:     ImgProc_ImageProc3 * Method:    RgbMatUndistortMat * Signature: (JIIJ)Z */JNIEXPORT jboolean JNICALL Java_ImgProc_ImageProc3_RgbMatUndistortMat  (JNIEnv *jenv, jclass jclassz, jlong pArgbMatAddr, jint width, jint height, jlong pArgbOutMatAddr){Mat in=*((Mat*)pArgbMatAddr);Mat out = *((Mat*)pArgbOutMatAddr);double cam[] = {width, 0, width / 2, 0, height, height / 2, 0, 0, 1 };double distort[] = { 0.1, 0.35, 0.0, 0.0, 0.01 };Mat camMat = Mat(3, 3, CV_64FC1, cam);Mat disMat = Mat(5, 1, CV_64FC1, distort);undistort(in, out, camMat, disMat);return true;}/* * Class:     ImgProc_ImageProc3 * Method:    YuvNv21UndistortRgba * Signature: ([BII[I)Z */JNIEXPORT jboolean JNICALL Java_ImgProc_ImageProc3_YuvNv21UndistortRgba  (JNIEnv *jenv, jclass jclassz, jbyteArray YuvNv21, jint width, jint height, jintArray pixels){jbyte * pBuf = (jbyte*) jenv->GetByteArrayElements(YuvNv21, 0);jint * poutPixels = jenv->GetIntArrayElements(pixels, 0);Mat image(height + height / 2, width, CV_8UC1, (unsigned char *) pBuf);Mat rgba(height, width, CV_8UC4, (unsigned char*) poutPixels);Mat tmp(height, width, CV_8UC4);cvtColor(image, tmp, CV_YUV420sp2RGBA);double cam[] = { width, 0, width / 2, 0, height, height / 2, 0, 0, 1 };double distort[] = { 0.1, 0.35, 0.0, 0.0, 0.01 };Mat camMat = Mat(3, 3, CV_64FC1, cam);Mat disMat = Mat(5, 1, CV_64FC1, distort);undistort(tmp, tmp, camMat, disMat);vector < Mat > channels;split(tmp, channels);Mat r = channels.at(0);Mat g = channels.at(1);Mat b = channels.at(2);Mat a = channels.at(3);vector < Mat > mbgr(4);mbgr[0] = b;mbgr[1] = g;mbgr[2] = r;mbgr[3] = a;merge(mbgr, rgba);jenv->ReleaseByteArrayElements(YuvNv21, pBuf, 0);jenv->ReleaseIntArrayElements(pixels, poutPixels, 0);return true;}/* * Class:     ImgProc_ImageProc3 * Method:    YuvNv21UndistortRgbaMat * Signature: ([BIIJ)Z */JNIEXPORT jboolean JNICALL Java_ImgProc_ImageProc3_YuvNv21UndistortRgbaMat  (JNIEnv *jenv, jclass jclassz, jbyteArray YuvNv21, jint width, jint height, jlong pMatAddr){jbyte * pBuf = (jbyte*) jenv->GetByteArrayElements(YuvNv21, 0);//jint * poutPixels = jenv->GetIntArrayElements(pixels, 0);Mat image(height + height / 2, width, CV_8UC1, (unsigned char *) pBuf);//Mat rgba(height, width, CV_8UC4, (unsigned char*) poutPixels);Mat rgba = *((Mat*) pMatAddr);Mat tmp(height, width, CV_8UC4);cvtColor(image, tmp, CV_YUV420sp2RGBA);double cam[] = { width, 0, width / 2, 0, height, height / 2, 0, 0, 1 };double distort[] = { 0.1, 0.35, 0.0, 0.0, 0.01 };Mat camMat = Mat(3, 3, CV_64FC1, cam);Mat disMat = Mat(5, 1, CV_64FC1, distort);undistort(tmp, tmp, camMat, disMat);vector < Mat > channels;split(tmp, channels);Mat r = channels.at(0);Mat g = channels.at(1);Mat b = channels.at(2);Mat a = channels.at(3);vector < Mat > mbgr(4);mbgr[0] = b;mbgr[1] = g;mbgr[2] = r;mbgr[3] = a;merge(mbgr, rgba);jenv->ReleaseByteArrayElements(YuvNv21, pBuf, 0);//jenv->ReleaseIntArrayElements(pixels, poutPixels, 0);return true;}#ifdef __cplusplus}#endif