Resize源码详解(参考Opencv4.1)

WTHunt

于 2020-08-20 10:56:09 发布

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分类专栏： opencv 文章标签： opencv c++ resize

本文链接：https://blog.youkuaiyun.com/qq_20880415/article/details/108119113

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inline uint16x8_t v_pack(const uint32x4_t& a, const uint32x4_t& b) 
{ 
    uint16x4_t a1 = vqmovn_u32(a), b1 = vqmovn_u32(b); 
    return uint16x8_t(vcombine_u16(a1, b1)); 
}

uint16x4_t = vqmovn_u32(const uint32x4_t) 饱和截断每个lane值为原来的一半

uint16x8_t = vcombine_u16(const uint16x4_t, const uint16x4_t) 组合两个16x4得到16x8

inline uint8x16_t v_rshr_pack_u(const int16x8_t& a, const int16x8_t& b)
{ 
	uint8x8_t a1 = vqrshrun_n_s16(a, 2);
	uint8x8_t b1 = vqrshrun_n_s16(b, 2);
    return uint8x16_t(vcombine_u8(a1, b1));
}

uint8x8_t = vqrshrun_n_s16(const int16x8_t, int a) 右移每个值a位，然后饱和截断为原来的一半

inline int16x8_t v_mul_hi(const int16x8_t& a, const int16x8_t& b)
{
	return int16x8_t(vcombine_s16(
		vshrn_n_s32(vmull_s16(vget_low_s16(a), vget_low_s16(b)), 16),
		vshrn_n_s32(vmull_s16(vget_high_s16(a), vget_high_s16(b