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Generating ArUco markers with OpenCV and Python
In this tutorial you will learn how to generate ArUco markers using OpenCV and Python. Today’s blog post is part one in our three-part series on ArUCo markers and fiducials: Generating ArUco markers...
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Detecting ArUco markers with OpenCV and Python
In this tutorial you will learn how to detect ArUco markers in images and real-time video streams using OpenCV and Python. This blog post is part two in our three-part series on ArUco markers and...
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Determining ArUco marker type with OpenCV and Python
In this tutorial you will learn how to automatically determine ArUco marker type/dictionary with OpenCV and Python. Today’s tutorial is the final part of our three-part series on ArUco marker...
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OpenCV Augmented Reality (AR)
In this tutorial you will learn the basics of augmented reality with OpenCV. Augmented reality takes real-world environments and then enhances these environments through computer-generated procedures...
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OpenCV Video Augmented Reality
In this tutorial you will learn how to perform real-time augmented reality in video streams using OpenCV. Last week we covered the basics of augmented reality with OpenCV; however, that tutorial only...
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Contrastive Loss for Siamese Networks with Keras and TensorFlow
In this tutorial you will learn about contrastive loss and how it can be used to train more accurate siamese neural networks. We will implement contrastive loss using Keras and TensorFlow. Previously,...
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Detecting low contrast images with OpenCV, scikit-image, and Python
In this tutorial you will learn how to detect low contrast images using OpenCV and scikit-image. Whenever I teach the fundamentals of computer vision and image processing to students eager to learn,...
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Image Arithmetic OpenCV
In this tutorial, you will learn how to perform image arithmetic (addition and subtraction) with OpenCV. Remember way, way back when you studied how to add and subtract numbers in grade school? Well,...
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Image Masking with OpenCV
In this tutorial, you will learn how to mask images using OpenCV. My previous guide discussed bitwise operations, a very common set of techniques used heavily in image processing. And as I hinted...
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OpenCV Bitwise AND, OR, XOR, and NOT
In this tutorial, you will learn how to apply bitwise AND, OR, XOR, and NOT with OpenCV. In our previous tutorial on Cropping with OpenCV, you learned how to crop and extract a Region of Interest...
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OpenCV Resize Image ( cv2.resize )
In this tutorial, you will learn how to resize an image using OpenCV and the cv2.resize function. Scaling, or simply resizing, is the process of increasing or decreasing the size of an image in terms...
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OpenCV Getting and Setting Pixels
In this tutorial, you will learn how to get and set pixel values using OpenCV and Python. You will also learn: What pixels areHow the image coordinate system works in OpenCVHow to access/get...
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OpenCV Flip Image ( cv2.flip )
In this tutorial, you will learn how to flip images using OpenCV and the cv2.flip function. Similar to image rotation, OpenCV also provides methods to flip an image across its x- or y-axis. Though...
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OpenCV Rotate Image
In this tutorial, you will learn how to rotate an image using OpenCV. Additionally, I’ll also show you how to rotate an image using my two convenience functions from the imutils library,...
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Splitting and Merging Channels with OpenCV
In this tutorial, you will learn how to split and merge channels with OpenCV. As we know, an image is represented by three components: a Red, Green, and Blue channel. And while we’ve briefly discussed...
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Drawing with OpenCV
In this tutorial, you will learn how to use OpenCV’s basic drawing functions. You will learn how to use OpenCV to draw: LinesRectanglesCircles You will also learn how to use OpenCV to draw on images...
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OpenCV Histogram Equalization and Adaptive Histogram Equalization (CLAHE)
In this tutorial, you will learn to perform both histogram equalization and adaptive histogram equalization with OpenCV. Histogram equalization is a basic image processing technique that adjusts the...
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OpenCV Image Translation
In this tutorial, you will learn how to translate and shift images using OpenCV. Translation is the shifting of an image along the x- and y-axis. To translate an image using OpenCV, we must: Load an...
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Histogram matching with OpenCV, scikit-image, and Python
In this tutorial, you will learn how to perform histogram matching using OpenCV and scikit-image. Last week we discussed histogram equalization, a basic image processing technique that can improve the...
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Using computer vision and OCR for immigration document classification (an...
In this post, I interview Vince DiMascio, CIO/CTO of Berry Appleman & Leiden (BAL), a law firm specializing in corporate immigration. BAL is using computer vision, machine learning, and artificial...
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