Merge pull request #15572 from l-bat:deconv3d

Fix computation of internal shapes in Deconvolution layer

* Fix computation of internal shapes

* Refactoring

modules/dnn/src/dnn.cpp

@@ -2452,6 +2452,12 @@ struct Net::Impl
         int requiredOutputs = layers[id].requiredOutputs.size();
         inOutShapes[id].supportInPlace =
                 layers[id].getLayerInstance()->getMemoryShapes(is, requiredOutputs, os, ints);
+
+        for (int i = 0; i < ints.size(); i++)
+            CV_Assert(total(ints[i]) > 0);
+
+        for (int i = 0; i < os.size(); i++)
+            CV_Assert(total(os[i]) > 0);
     }
 
     void getLayersShapes(const ShapesVec& netInputShapes,

modules/dnn/src/layers/convolution_layer.cpp

@@ -240,10 +240,14 @@ public:
 
     MatShape computeColRowShape(const MatShape &inpShape, const MatShape &outShape) const CV_OVERRIDE
     {
-        Size out(outShape[3], outShape[2]);
+        int dims = inpShape.size();
+        int inpD = dims == 5 ? inpShape[2] : 1;
+        int inpH = inpShape[dims - 2];
+        int inpW = inpShape.back();
         int inpGroupCn = blobs[0].size[1];
-        int ksize = inpGroupCn * kernel.height * kernel.width;
-        return shape(out.area(), ksize);
+        int ksize = inpGroupCn * std::accumulate(kernel_size.begin(), kernel_size.end(),
+                                                 1, std::multiplies<size_t>());
+        return shape(inpD * inpH * inpW, ksize);
     }
 
     virtual bool supportBackend(int backendId) CV_OVERRIDE
@@ -1228,14 +1232,17 @@ public:
 
     MatShape computeColRowShape(const MatShape &inpShape, const MatShape &outShape) const CV_OVERRIDE
     {
+        int dims = inpShape.size();
         int inpCn = inpShape[1];
-        int inpH = inpShape[2];
-        int inpW = inpShape[3];
+        int inpD = dims == 5 ? inpShape[2] : 1;
+        int inpH = inpShape[dims - 2];
+        int inpW = inpShape.back();
         int outCn = outShape[1];
         int ngroups = inpCn / blobs[0].size[0];
         int outGroupCn = outCn / ngroups;
-        int ksize = outGroupCn * kernel.height * kernel.width;
-        return shape(ksize, inpH * inpW);
+        int ksize = outGroupCn * std::accumulate(kernel_size.begin(), kernel_size.end(),
+                                                 1, std::multiplies<size_t>());
+        return shape(ksize, inpD * inpH * inpW);
     }
 
     virtual bool supportBackend(int backendId) CV_OVERRIDE