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Category: OpenCV

#004 OpenCV projects – How to extract features from the image in Python?

Highlights: In this post, we are going to show how to detect distinct features in an image. We will describe the important properties of these features (keypoints) and we will learn how we can use them to better understand the structure and the content of an image. Furthermore, we will talk about the most common algorithms that can be used for feature detection. So, let’s begin. Tutorial overview: What are keypoints? Detecting corners with Harris…
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#017 Face detection algorithms comparison

Highlights: Researchers and computer vision practitioners have generally developed many face detection algorithms. In this post, we will use 5 of the most popular algorithms. Also, we will compare their detection accuracy rate. Additionally, we will measure the runtime of these algorithms. Facial detection is a technique used by computer algorithms to detect a person’s face through images. Accordingly, the objective of facial detection is to get different features of human faces from images. Due to…
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#005 Image Arithmetic and Logical operations in OpenCV with Python

Highlight: Hello and welcome to the sixth part of our OpenCV with Python post series. In this post we will cover some basic image arithmetic. You will learn how to perform some elementary arithmetic operations on images like addition and subtraction. In addition we will talk about logical bitwise operations (AND, OR, XOR, NOT). Also, we will see how we can implement these operations in some practical tasks in Python. For example, we will explain…
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#004 How to smooth and sharpen an image in OpenCV?

Highlight: In our previous posts we mastered some basic image processing techniques and now we are ready to move on to more advanced concepts. In this post, we are going to explain how to blur and sharpen images. When we want to blur or sharpen our image, we need to apply a linear filter. You will learn several types of filters that we often use in the image processing In addition, we will also show…
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#003 How to resize, translate, flip and rotate an image with OpenCV?

Highlight: In our previous posts we learned how to implement some simple functions that allow us to load, modify and draw some basic shapes on our input images. Now, when we have a solid foundation, it is time to dive deeper to our first image processing techniques. We should keep in mind these techniques because they are fundamental tools for almost all areas of computer vision. Therefore, a basic understanding of image processing is crucial…
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