cv::pyrDown

modules/imgproc/src/pyramids.cpp

@@ -178,9 +178,153 @@ struct PyrDownVec_32f
     }
 };
 
+typedef NoVec<int, ushort> PyrDownVec_32s16u;
+typedef NoVec<int, short> PyrDownVec_32s16s;
+
+#elif CV_NEON
+
+struct PyrDownVec_32s8u
+{
+    int operator()(int** src, uchar* dst, int, int width) const
+    {
+        int x = 0;
+        const unsigned int *row0 = (unsigned int*)src[0], *row1 = (unsigned int*)src[1],
+                           *row2 = (unsigned int*)src[2], *row3 = (unsigned int*)src[3],
+                           *row4 = (unsigned int*)src[4];
+        uint16x8_t v_delta = vdupq_n_u16(128);
+
+        for( ; x <= width - 16; x += 16 )
+        {
+            uint16x8_t v_r0 = vcombine_u16(vqmovn_u32(vld1q_u32(row0 + x)), vqmovn_u32(vld1q_u32(row0 + x + 4)));
+            uint16x8_t v_r1 = vcombine_u16(vqmovn_u32(vld1q_u32(row1 + x)), vqmovn_u32(vld1q_u32(row1 + x + 4)));
+            uint16x8_t v_r2 = vcombine_u16(vqmovn_u32(vld1q_u32(row2 + x)), vqmovn_u32(vld1q_u32(row2 + x + 4)));
+            uint16x8_t v_r3 = vcombine_u16(vqmovn_u32(vld1q_u32(row3 + x)), vqmovn_u32(vld1q_u32(row3 + x + 4)));
+            uint16x8_t v_r4 = vcombine_u16(vqmovn_u32(vld1q_u32(row4 + x)), vqmovn_u32(vld1q_u32(row4 + x + 4)));
+
+            v_r0 = vqaddq_u16(vqaddq_u16(v_r0, v_r4), vqaddq_u16(v_r2, v_r2));
+            v_r1 = vqaddq_u16(vqaddq_u16(v_r1, v_r2), v_r3);
+            uint16x8_t v_dst0 = vqaddq_u16(v_r0, vshlq_n_u16(v_r1, 2));
+
+            v_r0 = vcombine_u16(vqmovn_u32(vld1q_u32(row0 + x + 8)), vqmovn_u32(vld1q_u32(row0 + x + 12)));
+            v_r1 = vcombine_u16(vqmovn_u32(vld1q_u32(row1 + x + 8)), vqmovn_u32(vld1q_u32(row1 + x + 12)));
+            v_r2 = vcombine_u16(vqmovn_u32(vld1q_u32(row2 + x + 8)), vqmovn_u32(vld1q_u32(row2 + x + 12)));
+            v_r3 = vcombine_u16(vqmovn_u32(vld1q_u32(row3 + x + 8)), vqmovn_u32(vld1q_u32(row3 + x + 12)));
+            v_r4 = vcombine_u16(vqmovn_u32(vld1q_u32(row4 + x + 8)), vqmovn_u32(vld1q_u32(row4 + x + 12)));
+
+            v_r0 = vqaddq_u16(vqaddq_u16(v_r0, v_r4), vqaddq_u16(v_r2, v_r2));
+            v_r1 = vqaddq_u16(vqaddq_u16(v_r1, v_r2), v_r3);
+            uint16x8_t v_dst1 = vqaddq_u16(v_r0, vshlq_n_u16(v_r1, 2));
+
+            vst1q_u8(dst + x, vcombine_u8(vqmovn_u16(vshrq_n_u16(vaddq_u16(v_dst0, v_delta), 8)),
+                                          vqmovn_u16(vshrq_n_u16(vaddq_u16(v_dst1, v_delta), 8))));
+        }
+
+        return x;
+    }
+};
+
+struct PyrDownVec_32s16u
+{
+    int operator()(int** src, ushort* dst, int, int width) const
+    {
+        int x = 0;
+        const int *row0 = src[0], *row1 = src[1], *row2 = src[2], *row3 = src[3], *row4 = src[4];
+        int32x4_t v_delta = vdupq_n_s32(128);
+
+        for( ; x <= width - 8; x += 8 )
+        {
+            int32x4_t v_r00 = vld1q_s32(row0 + x), v_r01 = vld1q_s32(row0 + x + 4);
+            int32x4_t v_r10 = vld1q_s32(row1 + x), v_r11 = vld1q_s32(row1 + x + 4);
+            int32x4_t v_r20 = vld1q_s32(row2 + x), v_r21 = vld1q_s32(row2 + x + 4);
+            int32x4_t v_r30 = vld1q_s32(row3 + x), v_r31 = vld1q_s32(row3 + x + 4);
+            int32x4_t v_r40 = vld1q_s32(row4 + x), v_r41 = vld1q_s32(row4 + x + 4);
+
+            v_r00 = vaddq_s32(vqaddq_s32(v_r00, v_r40), vqaddq_s32(v_r20, v_r20));
+            v_r10 = vaddq_s32(vqaddq_s32(v_r10, v_r20), v_r30);
+            int32x4_t v_dst0 = vshrq_n_s32(vaddq_s32(vqaddq_s32(v_r00, vshlq_n_s32(v_r10, 2)), v_delta), 8);
+
+            v_r01 = vaddq_s32(vqaddq_s32(v_r01, v_r41), vqaddq_s32(v_r21, v_r21));
+            v_r11 = vaddq_s32(vqaddq_s32(v_r11, v_r21), v_r31);
+            int32x4_t v_dst1 = vshrq_n_s32(vaddq_s32(vqaddq_s32(v_r01, vshlq_n_s32(v_r11, 2)), v_delta), 8);
+
+            vst1q_u16(dst + x, vcombine_u16(vqmovun_s32(v_dst0), vqmovun_s32(v_dst1)));
+        }
+
+        return x;
+    }
+};
+
+struct PyrDownVec_32s16s
+{
+    int operator()(int** src, short* dst, int, int width) const
+    {
+        int x = 0;
+        const int *row0 = src[0], *row1 = src[1], *row2 = src[2], *row3 = src[3], *row4 = src[4];
+        int32x4_t v_delta = vdupq_n_s32(128);
+
+        for( ; x <= width - 8; x += 8 )
+        {
+            int32x4_t v_r00 = vld1q_s32(row0 + x), v_r01 = vld1q_s32(row0 + x + 4);
+            int32x4_t v_r10 = vld1q_s32(row1 + x), v_r11 = vld1q_s32(row1 + x + 4);
+            int32x4_t v_r20 = vld1q_s32(row2 + x), v_r21 = vld1q_s32(row2 + x + 4);
+            int32x4_t v_r30 = vld1q_s32(row3 + x), v_r31 = vld1q_s32(row3 + x + 4);
+            int32x4_t v_r40 = vld1q_s32(row4 + x), v_r41 = vld1q_s32(row4 + x + 4);
+
+            v_r00 = vaddq_s32(vqaddq_s32(v_r00, v_r40), vqaddq_s32(v_r20, v_r20));
+            v_r10 = vaddq_s32(vqaddq_s32(v_r10, v_r20), v_r30);
+            int32x4_t v_dst0 = vshrq_n_s32(vaddq_s32(vqaddq_s32(v_r00, vshlq_n_s32(v_r10, 2)), v_delta), 8);
+
+            v_r01 = vaddq_s32(vqaddq_s32(v_r01, v_r41), vqaddq_s32(v_r21, v_r21));
+            v_r11 = vaddq_s32(vqaddq_s32(v_r11, v_r21), v_r31);
+            int32x4_t v_dst1 = vshrq_n_s32(vaddq_s32(vqaddq_s32(v_r01, vshlq_n_s32(v_r11, 2)), v_delta), 8);
+
+            vst1q_s16(dst + x, vcombine_s16(vqmovn_s32(v_dst0), vqmovn_s32(v_dst1)));
+        }
+
+        return x;
+    }
+};
+
+struct PyrDownVec_32f
+{
+    int operator()(float** src, float* dst, int, int width) const
+    {
+        int x = 0;
+        const float *row0 = src[0], *row1 = src[1], *row2 = src[2], *row3 = src[3], *row4 = src[4];
+        float32x4_t v_4 = vdupq_n_f32(4.0f), v_scale = vdupq_n_f32(1.f/256.0f);
+
+        for( ; x <= width - 8; x += 8 )
+        {
+            float32x4_t v_r0 = vld1q_f32(row0 + x);
+            float32x4_t v_r1 = vld1q_f32(row1 + x);
+            float32x4_t v_r2 = vld1q_f32(row2 + x);
+            float32x4_t v_r3 = vld1q_f32(row3 + x);
+            float32x4_t v_r4 = vld1q_f32(row4 + x);
+
+            v_r0 = vaddq_f32(vaddq_f32(v_r0, v_r4), vaddq_f32(v_r2, v_r2));
+            v_r1 = vaddq_f32(vaddq_f32(v_r1, v_r2), v_r3);
+            vst1q_f32(dst + x, vmulq_f32(vmlaq_f32(v_r0, v_4, v_r1), v_scale));
+
+            v_r0 = vld1q_f32(row0 + x + 4);
+            v_r1 = vld1q_f32(row1 + x + 4);
+            v_r2 = vld1q_f32(row2 + x + 4);
+            v_r3 = vld1q_f32(row3 + x + 4);
+            v_r4 = vld1q_f32(row4 + x + 4);
+
+            v_r0 = vaddq_f32(vaddq_f32(v_r0, v_r4), vaddq_f32(v_r2, v_r2));
+            v_r1 = vaddq_f32(vaddq_f32(v_r1, v_r2), v_r3);
+            vst1q_f32(dst + x + 4, vmulq_f32(vmlaq_f32(v_r0, v_4, v_r1), v_scale));
+        }
+
+        return x;
+    }
+};
+
 #else
 
 typedef NoVec<int, uchar> PyrDownVec_32s8u;
+typedef NoVec<int, ushort> PyrDownVec_32s16u;
+typedef NoVec<int, short> PyrDownVec_32s16s;
 typedef NoVec<float, float> PyrDownVec_32f;
 
 #endif
@@ -561,9 +705,9 @@ void cv::pyrDown( InputArray _src, OutputArray _dst, const Size& _dsz, int borde
     if( depth == CV_8U )
         func = pyrDown_<FixPtCast<uchar, 8>, PyrDownVec_32s8u>;
     else if( depth == CV_16S )
-        func = pyrDown_<FixPtCast<short, 8>, NoVec<int, short> >;
+        func = pyrDown_<FixPtCast<short, 8>, PyrDownVec_32s16s >;
     else if( depth == CV_16U )
-        func = pyrDown_<FixPtCast<ushort, 8>, NoVec<int, ushort> >;
+        func = pyrDown_<FixPtCast<ushort, 8>, PyrDownVec_32s16u >;
     else if( depth == CV_32F )
         func = pyrDown_<FltCast<float, 8>, PyrDownVec_32f>;
     else if( depth == CV_64F )