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#OpenCV – Open a video file 🎥 and save each frame as a PNG 🖼 file to a folder 📂#Net5
Hi ! A couple of days ago I wrote this post, and made the sample with Python. So today, same scenario, however with C# 9 and Net5. This is a non-usual scenario, however I’m on a point where I need to extract all the frames from a video file. The reason: some of these frames… — read more
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#OpenCV – Open a video file 🎥 and save each frame as a PNG 🖼 file to a folder 📂#Python
Hi ! This is a non-usual scenario, however I’m on a point where I need to extract all the frames from a video file. The reason: some of these frames will be used to train a Machine Learning model. There are tools that can do this, however it’s a nice moment to do some OpenCV… — read more
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#dotnet – Display a video file🎥 in Winform using #OpenCV and #net5
Hi ! Super short post today, however is the base of the next series of posts around OpenCV and .Net 5. I already wrote on how to work with a webcam, and now it’s time to share a simple piece of code to show How to open and process a video frame by frame I’ve… — read more
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#dotnet – Packaging my WinForm #OpenCV and #net5 app in a one-self contained file (Thanks @shanselman!)
Hi ! A couple of days ago, Scott Hanselman posted about a super cool feature (see references): … you can make a single EXE that will run on any Windows Machine in two commands How to make a WinForms app with .NET 5 entirely from the command line and publish as one self-contained file and… — read more
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#dotnet – Pose detection from the 🎦 camera feed using #OpenCV and #net5. Home-made #kinect!
Hi ! LearnOpenCV is an amazing resource to learn about OpenCV. And, it has lot of scenarios of real life problem solved with OpenCV. Most of the samples are in C++ or Python, so I decided to pick one related to pose estimation, and using .Net 5 in a Winforms App, build something like this:… — read more
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#dotnet – GoogleNet detection from the 🎦 camera feed using #OpenCV and #net5. Bonus: C++ to C# time!
Hi ! So I was browsing in the OpenCV documentation and I find a nice sample that uses opencv_dnn module for image classification by using GoogLeNet trained network from Caffe model zoo. So I give it a try, and get a decent .Net 5 Winforms App running at ~30 FPS. The model was trained with… — read more
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#dotnet – Age and Gender estimation from the 🎦 camera feed using #OpenCV and #net5
Hi ! Face detected, so next step is to use some prebuild models to perform additional actions: like estimate the Age of a face, and also the Gender. In order to do this, I downloaded a couple of models from here. Disclaimer: these models are just sample models, do not use them in production. These… — read more
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#dotnet – Detecting Faces, DNN vs Haar Cascades from the 🎦 camera feed using #OpenCV and #net5
Hi ! In one session around computer vision, someone ask the question about which approach is better Haar Cascades or DNN? And the answer can be show using the video below As you can see Haar Cascades works great for faces looking directly to the camera, with good lights and in optimal conditions. However, once… — read more
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#dotnet – Detecting Faces using DNN from the 🎦 camera feed in a WinForm using #OpenCV and #net5
Hi ! Let’s do some face detection using a DNN model (See references). As yesterday, I won’t write about details, there are almost 20 years of online documentation available. And, IMHO opinion code is much more useful that long writing, so let’s go there. 1st load the Caffe model and the config file. And, once… — read more
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#dotnet – Detecting Faces using Cascades from the 🎦 camera feed in a WinForm using #OpenCV and #net5
Hi ! Let’s do some face detection using one of the most popular methods: Haar Casacades (See references). I won’t write about Cascades, there are almost 20 years of online documentation available. And, IMHO opinion code is much more useful that long writing, so let’s go there. 1st load the cascade definition file. And, once… — read more
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#dotnet – Display the 🎦 camera feed in a WinForm using #OpenCV and #net5
Hi ! Back on the Windows Forms days, cameras were tricky. We didn’t have a lot of libraries to work, and they usually require some extra work to handle unexpected errors. With Net 5 and OpenCVSharp, we can create a simple WebCam viewer like this one. Let’s start with a [Take a Photo] Windows Form… — read more
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#dotnet – detecting corners on the 🎦 camera feed with FAST algorithm, #OpenCV and #net5
Hi ! Today is a quick one: FAST corner detection algorithm. FAST (Features from Accelerated Segment Test) algorithm was proposed by Edward Rosten and Tom Drummond in their paper “Machine learning for high-speed corner detection” in 2006 (Later revised it in 2010). A basic summary of the algorithm is presented below. Refer original paper for… — read more
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#dotnet – detecting edges on the 🎦 camera feed with Canny algorithm, #OpenCV and #net5
Hi ! The Canny edge detection is one the most popular algorithms, and it’s also +30 years old. The Canny edge detector is an edge detection operator that uses a multi-stage algorithm to detect a wide range of edges in images. It was developed by John F. Canny in 1986. OpenCV includes the Canny algorithm… — read more
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#dotnet – less than 20 lines to display a 🎦 camera feed with #OpenCV and #net5
Hi ! This post is the start of a series of posts around OpenCV and DotNet Core .Net 5. Most of my samples are going to be camera based, so I’ll start with the +20 13 lines needed to access a local camera and show the frames in a window. And the code using Net… — read more
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#AI – #Lobe, exporting to ONNX, and running in C# #csharp @lobe_ai
Hi ! Follow up post after yesterday post on Lobe, and today focusing on ONNX and C# code. And, it all started because someone asked in twitter about an ETA to export the model to ONNX I decided to give a try to the TensorFlow to Onnx tool, and it worked great ! (see references).… — read more
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#Python – Creating GUIs with #PySimpleGUI. 2 webcams view with 50 lines of code
Hi ! Working with Computer Vision is super fun. And there are some scenarios where display the step by step of the processing of an image is the best way to present this. In most of my scenarios I use OpenCV, however for a more detailed presentation I needed to search and learn a GUI… — read more
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#Python – #FastAPI Webserver sharing information from values in a different thread
Hi ! After my yesterday post using Flask, I was sure that a FastAPI version will be needed, so here it goes: I have a common scenario which involves: A sensor collecting information A web-server publishing the sensor information Read my previous posts to understand why I think this is the simple way to solve… — read more
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#Python – Flask Webserver sharing information from values in a different thread
Hi ! I have a common scenario which involves: A sensor collecting information A web-server publishing the sensor information This is simple, however the sensor does not support constants requests, and it may return a “too many requests” response when called directly. The idea to get the sensor information directly in the web-request was not… — read more
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#ComputerVision – Object Detection with #YoloV3 and #MobileNetSSD
Hi ! I have a ToDo in my list, to add some new drone demos. In order to do this, I was planning to perform some tests with pretrained models and use them. The 1st 2 in my list are Yolo and MobileNetSSD (see references). YoloV3 Let’s start with one of the most popular object… — read more
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El Bruno 