remove asymmetric padding checks

modules/dnn/src/layers/convolution_layer.cpp

@@ -101,10 +101,6 @@ public:
         if (kernel_size.size() == 2) {
             kernel = Size(kernel_size[1], kernel_size[0]);
             stride = Size(strides[1], strides[0]);
-            for (int i = 0; i < pads_begin.size(); i++) {
-                if (pads_begin[i] != pads_end[i])
-                    CV_Error(Error::StsNotImplemented, "Unsupported asymmetric padding in convolution layer");
-            }
             pad = Size(pads_begin[1], pads_begin[0]);
             dilation = Size(dilations[1], dilations[0]);
 
@@ -163,10 +159,6 @@ public:
         }
         getConvPoolPaddings(inpShape, kernel_size, strides, padMode, pads_begin, pads_end);
         if (pads_begin.size() == 2) {
-            for (int i = 0; i < pads_begin.size(); i++) {
-                if (pads_begin[i] != pads_end[i])
-                    CV_Error(Error::StsNotImplemented, "Unsupported asymmetric padding in convolution layer");
-            }
             pad = Size(pads_begin[1], pads_begin[0]);
         }
         fusedWeights = false;

modules/dnn/src/onnx/onnx_importer.cpp

@@ -2067,44 +2067,6 @@ void ONNXImporter::parseConv(LayerParams& layerParams, const opencv_onnx::NodePr
     int outCn = layerParams.blobs.empty() ? outShapes[node_proto.input(1)][0] : layerParams.blobs[0].size[0];
     layerParams.set("num_output", outCn);
 
-    // Check for asymmetric padding in Conv2D
-    if (layerParams.has("pad"))
-    {
-        bool asymmetricPadding = false;
-        DictValue pads = layerParams.get("pad");
-        const int dims = pads.size() / 2;
-        for (int i = 0; i < dims; ++i)
-        {
-            if (pads.get<int>(i) != pads.get<int>(i + dims))
-            {
-                asymmetricPadding = true;
-                break;
-            }
-        }
-        if (asymmetricPadding && pads.size() == 4) // [pad_t, pad_l, pad_b, pad_r]
-        {
-            layerParams.erase("pad");
-            // No paddings required for N, C axis
-            std::vector<int> paddings(4, 0);
-            // Add paddings for H, W axis
-            for (int i = 0; i < dims; ++i)
-            {
-                paddings.push_back(pads.get<int>(i));
-                paddings.push_back(pads.get<int>(dims + i));
-            }
-            LayerParams padLp;
-            padLp.name = layerParams.name + "/pad";
-            padLp.type = "Padding";
-            padLp.set("paddings", DictValue::arrayInt(&paddings[0], paddings.size()));
-
-            opencv_onnx::NodeProto proto;
-            proto.add_input(node_proto.input(0));
-            proto.add_output(padLp.name);
-
-            addLayer(padLp, proto);
-            node_proto.set_input(0, padLp.name);
-        }
-    }
     addLayer(layerParams, node_proto);
 }