Merge remote-tracking branch 'upstream/3.4' into merge-3.4

modules/dnn/include/opencv2/dnn/dnn.hpp

@@ -816,6 +816,7 @@ CV__DNN_INLINE_NS_BEGIN
       *                  * `*.t7` | `*.net` (Torch, http://torch.ch/)
       *                  * `*.weights` (Darknet, https://pjreddie.com/darknet/)
       *                  * `*.bin` (DLDT, https://software.intel.com/openvino-toolkit)
+      *                  * `*.onnx` (ONNX, https://onnx.ai/)
       * @param[in] config Text file contains network configuration. It could be a
       *                   file with the following extensions:
       *                  * `*.prototxt` (Caffe, http://caffe.berkeleyvision.org/)
@@ -864,6 +865,23 @@ CV__DNN_INLINE_NS_BEGIN
      */
     CV_EXPORTS_W Net readNetFromONNX(const String &onnxFile);
 
+    /** @brief Reads a network model from <a href="https://onnx.ai/">ONNX</a>
+     *         in-memory buffer.
+     *  @param buffer memory address of the first byte of the buffer.
+     *  @param sizeBuffer size of the buffer.
+     *  @returns Network object that ready to do forward, throw an exception
+     *        in failure cases.
+     */
+    CV_EXPORTS Net readNetFromONNX(const char* buffer, size_t sizeBuffer);
+
+    /** @brief Reads a network model from <a href="https://onnx.ai/">ONNX</a>
+     *         in-memory buffer.
+     *  @param buffer in-memory buffer that stores the ONNX model bytes.
+     *  @returns Network object that ready to do forward, throw an exception
+     *        in failure cases.
+     */
+    CV_EXPORTS_W Net readNetFromONNX(const std::vector<uchar>& buffer);
+
     /** @brief Creates blob from .pb file.
      *  @param path to the .pb file with input tensor.
      *  @returns Mat.