OpenCvSharp Mat Ptr用法

Question

我知道非常小的C ++。我试图将编写C ++的代码转换为C＃。但我无法转换此代码：

/* Convert the angle into predefined 3x3 neighbor locations
 | 2 | 3 | 4 |
 | 1 | 0 | 5 |
 | 8 | 7 | 6 |
 */
for( int y = 0; y < grad_dir.rows; y++ ) {
    float * grad_ptr = grad_dir.ptr<float>(y);

    for( int x = 0; x < grad_dir.cols; x++ ) {
        if( grad_ptr[x] != 0 )
            grad_ptr[x] = toBin( grad_ptr[x] );
    }
}

托宾：

int RobustTextDetection::toBin( const float angle, const int neighbors ) {
    const float divisor = 180.0 / neighbors;
    return static_cast<int>( (( floor(angle / divisor)  - 1) / 2) + 1 ) % neighbors + 1;
}

grad_ptr.Ptr返回IntPtr但它不是数组，因此编译器给出了错误。如何将其转换为C＃