안드로이드 영상처리 질문!!(YUV 신호 출력)

Question

안녕하세요~ ndk로 영상처리관련 개발을 하고있습니다.

지금 개발 환경을 구축 하고 있는데요...

JNI 단에서 카메라신호(YUV)를 받아 각각 RGB를 표현하는건 했는데...

정작 Y신호를 못뿌려 주고있네요.. 데이터 처리를 잘못 해서 그런지...

소스 올립니다...

(flag 가 4일때 Y신호를 나타내 줍니다.)

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mCamera.setPreviewCallback(new Camera.PreviewCallback() {           @Override     public void onPreviewFrame(byte[] data, Camera camera) {      // TODO Auto-generated method stub             Camera.Parameters params = camera.getParameters();      width = params.getPreviewSize().width;      height = params.getPreviewSize().height;             prBitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);      //prBitmap = Bitmap.createBitmap(width, height, Bitmap.Config.RGB_565);             HISTOGRAMCOMPRESS(prBitmap, data, flag);             //onDraw(canvas);      /*canvas = new Canvas(prBitmap);      if(a == 0)       drawable.setBounds(100, 100, width, height);      drawable.draw(canvas);*/      /*canvas.setBitmap(prBitmap);      onDraw(canvas);      if(canvas != null)       holder.unlockCanvasAndPost(canvas);*/      mImageview.setImageBitmap(prBitmap);      //a = 1;     }    });

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JNIEXPORT void JNICALL Java_com_joy_testnativecamera_MainActivity_HISTOGRAMCOMPRESS(JNIEnv * pEnv, jobject pObj, jobject pBitmap, jbyteArray pinArray, jint flag) {      AndroidBitmapInfo lBitmapInfo;    uint32_t* lBitmapContent;    int lRet;    // LOGE(1, "**IN JNI bitmap converter IN!");    //1. retrieve information about the bitmap      if ((lRet = AndroidBitmap_getInfo(pEnv, pBitmap, &lBitmapInfo)) < 0) {         LOGE(1, "AndroidBitmap_getInfo failed! error = %d", lRet);         return;     }      if (lBitmapInfo.format != ANDROID_BITMAP_FORMAT_RGBA_8888) {       LOGE(1, "Bitmap format is not RGBA_8888!");     return;  }    //2. lock the pixel buffer and retrieve a pointer to it       if ((lRet = AndroidBitmap_lockPixels(pEnv, pBitmap, (void**)&lBitmapContent)) < 0) {         LOGE(1, "AndroidBitmap_lockPixels() failed! error = %d", lRet);   return;     }    jbyte* lSource = (*pEnv)->GetPrimitiveArrayCritical(pEnv, pinArray, 0);    if (lSource == NULL) {     LOGE(1, "Source is null");   return;  }     //LOGE(1, "**Start JNI bitmap converter ");      int32_t lFrameSize = lBitmapInfo.width * lBitmapInfo.height;  int32_t lYIndex, lUVIndex;  int32_t lX, lY;  int32_t lColorY, lColorU, lColorV;  int32_t lColorR, lColorG, lColorB;  int32_t y1192;     // Processes each pixel and converts YUV to RGB color.    for (lY = 0, lYIndex = 0; lY < lBitmapInfo.height; ++lY) {     lColorU = 0; lColorV = 0;     // Y is divided by 2 because UVs are subsampled vertically.   // This means that two consecutives iterations refer to the   // same UV line (e.g when Y=0 and Y=1).     lUVIndex = lFrameSize + (lY >> 1) * lBitmapInfo.width;     for (lX = 0; lX < lBitmapInfo.width; ++lX, ++lYIndex) {      // Retrieves YUV components. UVs are subsampled    // horizontally too, hence %2 (1 UV for 2 Y).    lColorY = max(toInt(lSource[lYIndex]) - 16, 0);      if (!(lX % 2)) {       lColorV = toInt(lSource[lUVIndex++]) - 128;     lColorU = toInt(lSource[lUVIndex++]) - 128;    }      // Computes R, G and B from Y, U and V.      y1192 = 1192 * lColorY;        lColorR = (y1192 + 1634 * lColorV);      lColorG = (y1192 - 833 * lColorV - 400 * lColorU);      lColorB = (y1192 + 2066 * lColorU);      lColorR = clamp(lColorR, 0, 262143);      lColorG = clamp(lColorG, 0, 262143);      lColorB = clamp(lColorB, 0, 262143);           // Combines R, G, B and A into the final pixel color.      //lBitmapContent[lYIndex] = color(lColorR,lColorG,lColorB);    if(flag == 1)     lBitmapContent[lYIndex] = 0xFF000000 |((lColorR >> 10) & 0x000000FF);    else if(flag == 2)     lBitmapContent[lYIndex] = 0xFF000000 |((lColorG >> 2) & 0x0000FF00);    else if(flag == 3)     lBitmapContent[lYIndex] = 0xFF000000 |((lColorB << 6) & 0x00FF0000);    else if(flag == 4)     lBitmapContent[lYIndex] = lColorY ;       }    }    LOGE(1, "**Start JNI bitmap converter %d",lColorR);      (*pEnv)-> ReleasePrimitiveArrayCritical(pEnv,pinArray,lSource,0);    AndroidBitmap_unlockPixels(pEnv, pBitmap);    LOGI(1, "end color conversion2");   }

 

Answer 1

Y  범위가 8비트니까 RGB 성분으로 골고루 나눠주면 회색 단색 수준으로 나오겠죠.

lBitmapContent[lYIndex] = 0xFF000000 | (lColorY & 0xFF) << 16 | (lColorY & 0xFF) << 8 | (lColorY & 0xFF);

Comments

아..... 단순하게 생각을 못하고 있었네요.ㅠㅠ 감사합니다!!