Function test_pixel

src/backend/cpu/kernel/fast.hpp:46–50

// Returns  1 when x > p + thr
template<typename T>
inline int test_pixel(const T *image, const float p, float thr, int y, int x,
                      unsigned idim0) {
    return -test_smaller((float)image[idx(y, x, idim0)], p, thr) +
           test_greater((float)image[idx(y, x, idim0)], p, thr);
}

// abs_diff()
// Returns absolute difference of x and y