如何使用特定条件从c ++中的图像中获取像素坐标

Question

我想从像素值不为零的图像中得到（x，Y）坐标。我在这段代码中遇到以下错误： 错误访问：

camera.cpp
void Camera ::write_uint8_image_1(uint8_image_t *image, int *output)
{
    int index = 1;

     for(uint32_t i = 0; i < image->h; i++)
     {
         for(uint32_t j = 0; j < image->w; j++)
         {
             if(image->data[i * image->w + j] != 0)
                output[index++] = i;
                output[index++] = j;  /* error : bad access */
        }
     }
    output[0] = index;
}


main.cpp
 int output[800] = {0};

    /*print output*/

    C1.write_uint8_image_1(c.output_image, output);
    for (int i = 1; i < output[0]; i++)
        std::cout<< output[i] << " , ";