学习Opencv Chat3

• 基础结构体

CvPoint int x,y

CvPoint2D32f Float x,y;

CvSize Int width,height

CvRect int x,y,width,height

CvScalar double val[4] 这里为RGBA的值

• CvMat

typedef struct CvMat {
    int type;
    int step;
    int* refcount;     // for internal use only
    union {
         uchar* ptr;
         short* s;
         int*    i;
         float* fl;
         double* db;
    } data;
    union {
         int rows;
         int height;
    };
    union {
         int cols;
         int width;
    };
} CvMat;
float vals[] = [1,2,3,4];
cvCreateMat(5,5, CV_32FC1);
CvInitMatHeader {
    &Mat, 2, 2, CV_32FC1, vals  
}
*( (float*)CV_MAT_ELEM_PTR(*mat, 3, 2) ) = 7.7; // 赋值
cvmSet(mat, 2, 2, 0.5); 
double cvGet(mat, 2,2);

• IplImage

// 对于指定区域进行色彩加强
int main(){
    char input[] = "/Users/basasuya/Downloads/1.jpg";
    IplImage* src = cvLoadImage(input);
    int x,y,width,height,add;
    scanf("%d %d %d %d %d",&x,&y,&width,&height,&add);
    cvSetImageROI(src, cvRect(x,y,width,height));
    cvAddS(src, cvScalar(add), src);
    cvResetImageROI(src);
    cvNamedWindow("Roi_Add", 1);
    cvShowImage("Roi_Add", src);
    cvWaitKey();
}
//另一种加强的方式
int main(){
    char input[] = "/Users/basasuya/Downloads/1.jpg";
    IplImage* src = cvLoadImage(input);
    int x,y,width,height,add;
    scanf("%d %d %d %d %d",&x,&y,&width,&height,&add);
  //  cvSetImageROI(src, cvRect(x,y,width,height));
    IplImage* cha = cvCreateImageHeader(cvSize(width, height), src->depth, src->nChannels);
    cha->origin = src->origin;
    cha->widthStep = src->widthStep;
    cha->imageData = src->imageData + y* src->widthStep + x* src->nChannels;
    cvAddS(cha, cvScalar(add), cha);
    cvReleaseImageHeader(&cha);
    cvNamedWindow("Roi_add", CV_WINDOW_AUTOSIZE);
    cvShowImage("Roi_add", src);
    cvWaitKey();
    return 0;
}

//将两个图片进行叠加
int main(){
    char input1[] = "/Users/basasuya/Downloads/1.jpg";
    char input2[] = "/Users/basasuya/Downloads/2.jpg";

    IplImage* s1 = cvLoadImage(input1);
    IplImage* s2 = cvLoadImage(input2);
    int x,y,width,height;
    double alpha, beta;
    scanf("%d %d %lf %lf",&x,&y,&alpha,&beta);
    width = s2->width; height = s2->height;
  //  cvSetImageROI(src, cvRect(x,y,width,height));
    cvSetImageROI(s1, cvRect(x,y,width,height));
    cvSetImageROI(s2, cvRect(0,0,width,height));
    cvAddWeighted(s1, alpha, s2, beta, 0, s1);
    cvResetImageROI(s1);
    ShowImg(s1);
    return 0;
}