Add dockerfiles for .NET 6 on Ubuntu 20.4.

docker/ubuntu20-dotnet6-opencv4.5.3/Dockerfile

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+FROM mcr.microsoft.com/dotnet/aspnet:6.0-focal as builder
+
+ENV DEBIAN_FRONTEND=noninteractive
+ENV OPENCV_VERSION=4.5.3
+
+WORKDIR /
+
+# Install opencv dependencies
+RUN apt-get update && apt-get -y install --no-install-recommends \
+      apt-transport-https \
+      software-properties-common \
+      wget \
+      unzip \
+      ca-certificates \
+      build-essential \
+      cmake \
+      git \
+      libtbb-dev \
+      libatlas-base-dev \
+      libgtk2.0-dev \
+      libavcodec-dev \
+      libavformat-dev \
+      libswscale-dev \
+      libdc1394-22-dev \
+      libxine2-dev \
+      libv4l-dev \
+      libtheora-dev \
+      libvorbis-dev \
+      libxvidcore-dev \
+      libopencore-amrnb-dev \
+      libopencore-amrwb-dev \
+      libavresample-dev \
+      x264 \
+      libtesseract-dev \
+      libgdiplus \
+    && apt-get -y clean \
+    && rm -rf /var/lib/apt/lists/*
+
+# Setup opencv and opencv-contrib source
+RUN wget https://github.com/opencv/opencv/archive/${OPENCV_VERSION}.zip && \
+    unzip ${OPENCV_VERSION}.zip && \
+    rm ${OPENCV_VERSION}.zip && \
+    mv opencv-${OPENCV_VERSION} opencv && \
+    wget https://github.com/opencv/opencv_contrib/archive/${OPENCV_VERSION}.zip && \
+    unzip ${OPENCV_VERSION}.zip && \
+    rm ${OPENCV_VERSION}.zip && \
+    mv opencv_contrib-${OPENCV_VERSION} opencv_contrib
+
+# Build OpenCV
+RUN cd opencv && mkdir build && cd build && \
+    cmake \
+    -D OPENCV_EXTRA_MODULES_PATH=/opencv_contrib/modules \
+    -D CMAKE_BUILD_TYPE=RELEASE \
+    -D BUILD_SHARED_LIBS=OFF \
+    -D ENABLE_CXX11=ON \
+    -D BUILD_EXAMPLES=OFF \
+    -D BUILD_DOCS=OFF \
+    -D BUILD_PERF_TESTS=OFF \
+    -D BUILD_TESTS=OFF \
+    -D BUILD_JAVA=OFF \
+    -D BUILD_opencv_app=OFF \
+    -D BUILD_opencv_barcode=OFF \
+    -D BUILD_opencv_java_bindings_generator=OFF \
+    -D BUILD_opencv_js_bindings_generator=OFF \
+    -D BUILD_opencv_python_bindings_generator=OFF \
+    -D BUILD_opencv_python_tests=OFF \
+    -D BUILD_opencv_ts=OFF \
+    -D BUILD_opencv_js=OFF \
+    -D BUILD_opencv_bioinspired=OFF \
+    -D BUILD_opencv_ccalib=OFF \
+    -D BUILD_opencv_datasets=OFF \
+    -D BUILD_opencv_dnn_objdetect=OFF \
+    -D BUILD_opencv_dpm=OFF \
+    -D BUILD_opencv_fuzzy=OFF \
+    -D BUILD_opencv_gapi=OFF \
+    -D BUILD_opencv_intensity_transform=OFF \
+    -D BUILD_opencv_mcc=OFF \
+    -D BUILD_opencv_objc_bindings_generator=OFF \
+    -D BUILD_opencv_rapid=OFF \
+    -D BUILD_opencv_reg=OFF \
+    -D BUILD_opencv_stereo=OFF \
+    -D BUILD_opencv_structured_light=OFF \
+    -D BUILD_opencv_surface_matching=OFF \
+    -D BUILD_opencv_videostab=OFF \
+    -D BUILD_opencv_wechat_qrcode=OFF \
+    -D WITH_GSTREAMER=OFF \
+    -D WITH_ADE=OFF \
+    -D OPENCV_ENABLE_NONFREE=ON \
+    .. && make -j$(nproc) && make install && ldconfig
+
+# Download OpenCvSharp
+RUN git clone https://github.com/shimat/opencvsharp.git && cd opencvsharp
+
+# Install the Extern lib.
+RUN mkdir /opencvsharp/make && cd /opencvsharp/make && \
+    cmake -D CMAKE_INSTALL_PREFIX=/opencvsharp/make /opencvsharp/src && \
+    make -j$(nproc) && make install && \
+    rm -rf /opencv && \
+    rm -rf /opencv_contrib && \
+    cp /opencvsharp/make/OpenCvSharpExtern/libOpenCvSharpExtern.so /usr/lib/
+
+
+########## Test native .so file ##########
+
+FROM mcr.microsoft.com/dotnet/sdk:6.0-focal
+RUN apt-get update && apt-get -y install --no-install-recommends gcc
+# /usr/lib/libOpenCvSharpExtern.so
+# /usr/local/lib/libopencv_*.a
+COPY --from=builder /usr/lib /usr/lib
+#COPY --from=builder /usr/local/lib /usr/local/lib
+
+RUN echo "\n\
+#include <stdio.h> \n\
+int core_Mat_sizeof(); \n\
+int main(){ \n\
+  int i = core_Mat_sizeof(); \n\
+  printf(\"sizeof(Mat) = %d\", i); \n\
+  return 0; \n\
+}" > /test.c && \
+    gcc -I./ -L./ test.c -o test -lOpenCvSharpExtern && \
+    LD_LIBRARY_PATH=. ./test 
+
+
+########## Test .NET class libraries ##########
+
+FROM mcr.microsoft.com/dotnet/sdk:6.0-focal
+COPY --from=builder /usr/lib /usr/lib
+# Install Build the C# part of OpenCvSharp
+RUN git clone https://github.com/shimat/opencvsharp.git && cd opencvsharp
+RUN cd /opencvsharp/src/OpenCvSharp && \
+    dotnet build -c Release -f netcoreapp3.1 && \
+    cd /opencvsharp/src/OpenCvSharp.Extensions && \
+    dotnet build -c Release -f netcoreapp2.1
+
+RUN dotnet test /opencvsharp/test/OpenCvSharp.Tests/OpenCvSharp.Tests.csproj -c Release -f net6.0 --runtime ubuntu.20.04-x64 --logger "trx;LogFileName=test-results.trx" < /dev/null
+
+# Simple console app test using NuGet
+#RUN dotnet new console -f netcoreapp3.1 -o "ConsoleApp01" && cd /ConsoleApp01 && \
+#    echo "\n\
+#using System; \n\
+#using OpenCvSharp; \n\
+#class Program{ \n\
+#  static void Main(){ \n\
+#    Console.WriteLine(Cv2.GetTickCount()); \n\
+#    using var mat = new Mat(1, 1, MatType.CV_8UC1); \n\
+#    Console.WriteLine(mat.CvPtr); \n\
+#  } \n\
+#}" > Program.cs && \
+#    dotnet add package OpenCvSharp4 && \
+#    dotnet run && \
+#    rm -rf /ConsoleApp01
+
+#RUN ldd /artifacts/libOpenCvSharpExtern.so
+
+
+
+########## Final image ##########
+
+FROM mcr.microsoft.com/dotnet/aspnet:6.0-focal as final
+COPY --from=builder /usr/lib /usr/lib

docker/ubuntu20-dotnet6sdk-opencv4.5.3/Dockerfile

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+FROM mcr.microsoft.com/dotnet/aspnet:6.0-focal as builder
+
+ENV DEBIAN_FRONTEND=noninteractive
+ENV OPENCV_VERSION=4.5.3
+
+WORKDIR /
+
+# Install opencv dependencies
+RUN apt-get update && apt-get -y install --no-install-recommends \
+      apt-transport-https \
+      software-properties-common \
+      wget \
+      unzip \
+      ca-certificates \
+      build-essential \
+      cmake \
+      git \
+      libtbb-dev \
+      libatlas-base-dev \
+      libgtk2.0-dev \
+      libavcodec-dev \
+      libavformat-dev \
+      libswscale-dev \
+      libdc1394-22-dev \
+      libxine2-dev \
+      libv4l-dev \
+      libtheora-dev \
+      libvorbis-dev \
+      libxvidcore-dev \
+      libopencore-amrnb-dev \
+      libopencore-amrwb-dev \
+      libavresample-dev \
+      x264 \
+      libtesseract-dev \
+      libgdiplus \
+    && apt-get -y clean \
+    && rm -rf /var/lib/apt/lists/*
+
+# Setup opencv and opencv-contrib source
+RUN wget https://github.com/opencv/opencv/archive/${OPENCV_VERSION}.zip && \
+    unzip ${OPENCV_VERSION}.zip && \
+    rm ${OPENCV_VERSION}.zip && \
+    mv opencv-${OPENCV_VERSION} opencv && \
+    wget https://github.com/opencv/opencv_contrib/archive/${OPENCV_VERSION}.zip && \
+    unzip ${OPENCV_VERSION}.zip && \
+    rm ${OPENCV_VERSION}.zip && \
+    mv opencv_contrib-${OPENCV_VERSION} opencv_contrib
+
+# Build OpenCV
+RUN cd opencv && mkdir build && cd build && \
+    cmake \
+    -D OPENCV_EXTRA_MODULES_PATH=/opencv_contrib/modules \
+    -D CMAKE_BUILD_TYPE=RELEASE \
+    -D BUILD_SHARED_LIBS=OFF \
+    -D ENABLE_CXX11=ON \
+    -D BUILD_EXAMPLES=OFF \
+    -D BUILD_DOCS=OFF \
+    -D BUILD_PERF_TESTS=OFF \
+    -D BUILD_TESTS=OFF \
+    -D BUILD_JAVA=OFF \
+    -D BUILD_opencv_app=OFF \
+    -D BUILD_opencv_barcode=OFF \
+    -D BUILD_opencv_java_bindings_generator=OFF \
+    -D BUILD_opencv_js_bindings_generator=OFF \
+    -D BUILD_opencv_python_bindings_generator=OFF \
+    -D BUILD_opencv_python_tests=OFF \
+    -D BUILD_opencv_ts=OFF \
+    -D BUILD_opencv_js=OFF \
+    -D BUILD_opencv_bioinspired=OFF \
+    -D BUILD_opencv_ccalib=OFF \
+    -D BUILD_opencv_datasets=OFF \
+    -D BUILD_opencv_dnn_objdetect=OFF \
+    -D BUILD_opencv_dpm=OFF \
+    -D BUILD_opencv_fuzzy=OFF \
+    -D BUILD_opencv_gapi=OFF \
+    -D BUILD_opencv_intensity_transform=OFF \
+    -D BUILD_opencv_mcc=OFF \
+    -D BUILD_opencv_objc_bindings_generator=OFF \
+    -D BUILD_opencv_rapid=OFF \
+    -D BUILD_opencv_reg=OFF \
+    -D BUILD_opencv_stereo=OFF \
+    -D BUILD_opencv_structured_light=OFF \
+    -D BUILD_opencv_surface_matching=OFF \
+    -D BUILD_opencv_videostab=OFF \
+    -D BUILD_opencv_wechat_qrcode=OFF \
+    -D WITH_GSTREAMER=OFF \
+    -D WITH_ADE=OFF \
+    -D OPENCV_ENABLE_NONFREE=ON \
+    .. && make -j$(nproc) && make install && ldconfig
+
+# Download OpenCvSharp
+RUN git clone https://github.com/shimat/opencvsharp.git && cd opencvsharp
+
+# Install the Extern lib.
+RUN mkdir /opencvsharp/make && cd /opencvsharp/make && \
+    cmake -D CMAKE_INSTALL_PREFIX=/opencvsharp/make /opencvsharp/src && \
+    make -j$(nproc) && make install && \
+    rm -rf /opencv && \
+    rm -rf /opencv_contrib && \
+    cp /opencvsharp/make/OpenCvSharpExtern/libOpenCvSharpExtern.so /usr/lib/
+
+
+########## Test native .so file ##########
+
+FROM mcr.microsoft.com/dotnet/sdk:6.0-focal
+RUN apt-get update && apt-get -y install --no-install-recommends gcc
+# /usr/lib/libOpenCvSharpExtern.so
+# /usr/local/lib/libopencv_*.a
+COPY --from=builder /usr/lib /usr/lib
+#COPY --from=builder /usr/local/lib /usr/local/lib
+
+RUN echo "\n\
+#include <stdio.h> \n\
+int core_Mat_sizeof(); \n\
+int main(){ \n\
+  int i = core_Mat_sizeof(); \n\
+  printf(\"sizeof(Mat) = %d\", i); \n\
+  return 0; \n\
+}" > /test.c && \
+    gcc -I./ -L./ test.c -o test -lOpenCvSharpExtern && \
+    LD_LIBRARY_PATH=. ./test 
+
+
+########## Test .NET class libraries ##########
+
+FROM mcr.microsoft.com/dotnet/sdk:6.0-focal
+COPY --from=builder /usr/lib /usr/lib
+# Install Build the C# part of OpenCvSharp
+RUN git clone https://github.com/shimat/opencvsharp.git && cd opencvsharp
+RUN cd /opencvsharp/src/OpenCvSharp && \
+    dotnet build -c Release -f netcoreapp3.1 && \
+    cd /opencvsharp/src/OpenCvSharp.Extensions && \
+    dotnet build -c Release -f netcoreapp2.1
+
+RUN dotnet test /opencvsharp/test/OpenCvSharp.Tests/OpenCvSharp.Tests.csproj -c Release -f net6.0 --runtime ubuntu.20.04-x64 --logger "trx;LogFileName=test-results.trx" < /dev/null
+
+# Simple console app test using NuGet
+#RUN dotnet new console -f netcoreapp3.1 -o "ConsoleApp01" && cd /ConsoleApp01 && \
+#    echo "\n\
+#using System; \n\
+#using OpenCvSharp; \n\
+#class Program{ \n\
+#  static void Main(){ \n\
+#    Console.WriteLine(Cv2.GetTickCount()); \n\
+#    using var mat = new Mat(1, 1, MatType.CV_8UC1); \n\
+#    Console.WriteLine(mat.CvPtr); \n\
+#  } \n\
+#}" > Program.cs && \
+#    dotnet add package OpenCvSharp4 && \
+#    dotnet run && \
+#    rm -rf /ConsoleApp01
+
+#RUN ldd /artifacts/libOpenCvSharpExtern.so
+
+
+
+########## Final image ##########
+
+FROM mcr.microsoft.com/dotnet/sdk:6.0-focal as final
+COPY --from=builder /usr/lib /usr/lib