imgproc: fix unaligned memory access

may cause crashes on ARM platform

modules/imgproc/src/filter.simd.hpp

@@ -84,6 +84,7 @@ Ptr<BaseFilter> getLinearFilter(
 
 #ifndef CV_CPU_OPTIMIZATION_DECLARATIONS_ONLY
 
+typedef int CV_DECL_ALIGNED(1) unaligned_int;
 #define VEC_ALIGN CV_MALLOC_ALIGN
 
 int FilterEngine__start(FilterEngine& this_, const Size &_wholeSize, const Size &sz, const Point &ofs)
@@ -1049,7 +1050,7 @@ struct SymmColumnVec_32s8u
                     s0 = v_muladd(v_cvt_f32(v_load(src[k] + i) + v_load(src[-k] + i)), v_setall_f32(ky[k]), s0);
                 v_int32x4 s32 = v_round(s0);
                 v_int16x8 s16 = v_pack(s32, s32);
-                *(int*)(dst + i) = v_reinterpret_as_s32(v_pack_u(s16, s16)).get0();
+                *(unaligned_int*)(dst + i) = v_reinterpret_as_s32(v_pack_u(s16, s16)).get0();
                 i += v_int32x4::nlanes;
             }
         }
@@ -1104,7 +1105,7 @@ struct SymmColumnVec_32s8u
                     s0 = v_muladd(v_cvt_f32(v_load(src[k] + i) - v_load(src[-k] + i)), v_setall_f32(ky[k]), s0);
                 v_int32x4 s32 = v_round(s0);
                 v_int16x8 s16 = v_pack(s32, s32);
-                *(int*)(dst + i) = v_reinterpret_as_s32(v_pack_u(s16, s16)).get0();
+                *(unaligned_int*)(dst + i) = v_reinterpret_as_s32(v_pack_u(s16, s16)).get0();
                 i += v_int32x4::nlanes;
             }
         }
@@ -2129,7 +2130,7 @@ struct FilterVec_8u
                 s0 = v_muladd(v_cvt_f32(v_reinterpret_as_s32(v_load_expand_q(src[k] + i))), v_setall_f32(kf[k]), s0);
             v_int32x4 s32 = v_round(s0);
             v_int16x8 s16 = v_pack(s32, s32);
-            *(int*)(dst + i) = v_reinterpret_as_s32(v_pack_u(s16, s16)).get0();
+            *(unaligned_int*)(dst + i) = v_reinterpret_as_s32(v_pack_u(s16, s16)).get0();
             i += v_int32x4::nlanes;
         }
         return i;