OpenCvSharp
OpenCV wrapper for .NET (by shimat)
Magick.NET
The .NET library for ImageMagick (by dlemstra)
Our great sponsors
OpenCvSharp | Magick.NET | |
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9 | 12 | |
5,116 | 3,252 | |
- | - | |
7.8 | 9.6 | |
2 months ago | 4 days ago | |
C# | C# | |
Apache License 2.0 | Apache License 2.0 |
The number of mentions indicates the total number of mentions that we've tracked plus the number of user suggested alternatives.
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
OpenCvSharp
Posts with mentions or reviews of OpenCvSharp.
We have used some of these posts to build our list of alternatives
and similar projects. The last one was on 2023-01-12.
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Image Feature Detection and Matching using OpenCvSharp - First Steps Towards VinylEye
In a previous post, I have gone through the process for building a Docker Image for OpenCVSharp that supports multiple processor architectures.
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Does there exist an API accessible from C# that detects faces in images?
Alternatively, you can get into the nitty gritty of face detection yourself. OpenCV is a massive, open source project for all kinds computer vision tasks. Without jumping into the proprietary world, this is one of the most popular and capable computer vision libraries available. While powerful, OpenCV is comparatively low level; giving you the tools you need to accomplish your task, rather than a direct, single method to call. This tutorial goes into depth on how you'd go about training facial models to create your own detection methods. You'll notice that the example is written in C++. The con with this option (aside from it being more complex) is that OpenCV is largely used in the context of C++ or Python. However, it does have C# wrappers. Emgu CV is probably the most popular .NET wrapper for OpenCV, though there are other wrappers available. Here is a nice tutorial using OpenCVSharp, which is a bit closer to the native C++ API OpenCV uses.
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Compress/resize images
Another option for more advanced image manipulation - use OpenCV wrapper like opencvsharp. I haven't done much benchmarking, but from my understanding this is considerably faster option than anything made in managed code (like ImageSharp), but coming at the cost of native dependency and a bit more C++-style API and other quirks of OpenCV.
- Creating a NuGet package with static dependencies AND a native assembly wrapper?
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Universal UI testing based on image and text recognition
In order to do so, I had to learn about the basics of image processing. I was able to find an image within another with a technique called template matching, and I used an OpenCV wrapper made for .NET. I will not go through the technical details here, but you can find the relevant source code in my GitHub repository.
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Docker multi-architecture, .NET 6.0 and OpenCVSharp
FROM debian:bullseye-slim AS build-native-env ARG TARGETPLATFORM ENV DEBIAN_FRONTEND=noninteractive # 4.5.5: released 25 Dec 2021 ENV OPENCV_VERSION=4.5.5 # 4.5.3.20211228: released 28 Dec 2021 ENV OPENCVSHARP_VERSION=4.5.3.20211228 WORKDIR / # install dependencies required for building OpenCV and OpenCvSharpExtern RUN apt-get update && apt-get -y install --no-install-recommends \ # details omitted \ libgdiplus # Get OpenCV and opencv-contrib sources using the specified release. RUN wget https://github.com/opencv/opencv/archive/${OPENCV_VERSION}.zip && \ unzip ${OPENCV_VERSION}.zip && \ rm ${OPENCV_VERSION}.zip && \ mv opencv-${OPENCV_VERSION} opencv RUN 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 # configure and build OpenCV optionally specifying architecture related cmake options. RUN if [ "$TARGETPLATFORM" = "linux/amd64" ]; then \ ADDITIONAL_FLAGS='' ; \ elif [ "$TARGETPLATFORM" = "linux/arm64" ]; then \ ADDITIONAL_FLAGS='-D ENABLE_NEON=ON -D CPU_BASELINE=NEON ' ; \ elif [ "$TARGETPLATFORM" = "linux/arm/v7" ]; then \ ADDITIONAL_FLAGS='-D CPU_BASELINE=NEON -D ENABLE_NEON=ON ' ; \ fi && cd opencv && mkdir build && cd build && \ cmake $ADDITIONAL_FLAGS \ # additional flags omitted for clarity \ && make -j$(nproc) \ && make install \ && ldconfig # Download OpenCvSharp to build OpenCvSharpExtern native library RUN git clone https://github.com/shimat/opencvsharp.git RUN cd opencvsharp && git fetch --all --tags --prune && git checkout ${OPENCVSHARP_VERSION} WORKDIR /opencvsharp/src RUN mkdir /opencvsharp/make \ && cd /opencvsharp/make \ && cmake -D CMAKE_INSTALL_PREFIX=/opencvsharp/make /opencvsharp/src \ && make -j$(nproc) \ && make install \ && cp /opencvsharp/make/OpenCvSharpExtern/libOpenCvSharpExtern.so /usr/lib/ \ && ldconfig # Copy the library and dependencies to /artifacts (to be used by images consuming this build) # cpld.sh will copy the library we specify (./libOpenCvSharpExtern.so) and any dependencies # to the /artifacts directory. This is useful for sharing the library with other images # consuming this build. # credits: Hemanth.HM -> https://h3manth.com/content/copying-shared-library-dependencies WORKDIR /opencvsharp/make/OpenCvSharpExtern COPY cpld.sh . RUN chmod +x cpld.sh && \ mkdir /artifacts && \ ./cpld.sh ./libOpenCvSharpExtern.so /artifacts/ RUN cp ./libOpenCvSharpExtern.so /artifacts/ # Publish the artefacts using a clean image FROM debian:bullseye-slim AS final RUN mkdir /artifacts COPY --from=build-native-env /artifacts/ /artifacts WORKDIR /artifacts
- Why we can’t use C++ in WPF?
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What's the fastest way to get pixel data from a Bitmap?
Maybe opencv will be faster? https://github.com/shimat/opencvsharp
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image classification in .net with webcam
hello. the quickest way to access webcam in .NET would be use this package shimat/opencvsharp: OpenCV wrapper for .NET (github.com) and give feedback about using the lobe.OpenCVSharp binding to help you classify the images
Magick.NET
Posts with mentions or reviews of Magick.NET.
We have used some of these posts to build our list of alternatives
and similar projects. The last one was on 2023-04-04.
- Archetype Counter (The perfect counter tool for PokeMMO)
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Discussion Thread
There's Magick.NET, in retrospect it would probably be the best option, but I already learned enough SkiaSharp so I'm sticking with that.
- Announcing ImageSharp 3.0.0
- Can I read a webp image from a stream to "System.Drawing.Image"
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Compress/resize images
Magick.NET is also good, but has some unmanaged dependencies.
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Why is there a lack of cool repos?
Magick.NET for image manipulation https://github.com/dlemstra/Magick.NET
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What is the best way to ensure that image file is not more than 5mb?
We use Image Magick for anything image related like that. It's free. It will even perform image compression if you want to do that. Here's the Magick.NET c# library.
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What are you using in your c# dotnet core commercial web apps for backend image processing? Like thumbnail creation and determining video length... FFmpeg looked like a good choice but then there is significant documentation regarding it being unavailable for commercial use.
If I could, I would use ImageSharp. But as we depend on some tiff features that are not implemented, I’m using ImageMagick via Magick.NET
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.NET 5 Generate Captcha image
And you think what your images will be x10 stronger?) Btw, you can use cross-platform Magick.NET, but don't do that use any of nuget packages captchas, most of then have image difficulty settings.
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Resizing an image without System.Drawing
If you're happy with using image magick there's always Magick.net https://github.com/dlemstra/Magick.NET
What are some alternatives?
When comparing OpenCvSharp and Magick.NET you can also consider the following projects:
Emgu CV - Emgu CV is a cross platform .Net wrapper to the OpenCV image processing library.
ImageSharp - :camera: A modern, cross-platform, 2D Graphics library for .NET
ImageProcessor - :camera: A fluent wrapper around System.Drawing for the processing of image files.
ML.NET - ML.NET is an open source and cross-platform machine learning framework for .NET.
ImageResizer - The official repository for ImageResizer
MetadataExtractor - Extracts Exif, IPTC, XMP, ICC and other metadata from image, video and audio files
DotImaging - Minimalistic .NET imaging portable platform
DNTCaptcha.Core - DNTCaptcha.Core is a captcha generator and validator for ASP.NET Core applications
OpenCvSharp vs Emgu CV
Magick.NET vs ImageSharp
OpenCvSharp vs ImageSharp
Magick.NET vs ImageProcessor
OpenCvSharp vs ML.NET
Magick.NET vs Emgu CV
OpenCvSharp vs ImageProcessor
Magick.NET vs ImageResizer
OpenCvSharp vs MetadataExtractor
Magick.NET vs MetadataExtractor
OpenCvSharp vs DotImaging
Magick.NET vs DNTCaptcha.Core