Crop Contour Opencv Python

They are extracted from open source Python projects. numpy 세가지가 필수적으로 필요합니다. [OpenCV-Python Tutorials] 18. To find contours in an image, follow these steps: Read image as grey scale image. In this example, we have read an image and used ndarray. Introduction to OpenCV OpenCV stands for the Open Source Computer Vision Library. Regroup markers into rigid bodies 3. If a is greater than 1, there will be. Once a contour is. As mentioned in the first post, it’s quite easy to move from detecting faces in images to detecting them in video via a webcam - which is exactly what we will detail in this post. Think2Impact - A collaborative platform for Applied Systems Thinking → Image Background Removal using OpenCV in Python. To do contours detection OpenCV provide a function called FindContours which intent to find contours in the image. ← Record a video with OpenCV and python Testing a TCP. OpenCV-Python Tutorials 1 持つ形状であれば,輪郭以外の形状の描画にも使える.第1引数imageは入力画像,第2引数contoursはPython. By Philipp Wagner | May 26, 2012. Just note that, regardless of what version the Python package has become, whether it's 3. 0のサンプルはここからダウンロードし、opencv-4. The following are code examples for showing how to use cv2. Click and Crop Image. 15: Ubuntu에서 Opencv2. The result "contours" is a Python list, where it contains all objects boundary points as separate lists. Contours : Getting. Contour contour란 같은 값을 가진 값들을 하나의 선으로 연결하는 것을 뜻한다. OpenCV color detection and filtering is an excellent place to start OpenCV Python development. Updated 17 February 2019. All Explained. Python OpenCV cv2 Tutorial covers basic and intermediate Image Processing techniques like: read image, working with color channels, finding contours, resizing, capturing video, etc. It is a real shame that there is no official interface for Node. Camera Calibration and 3D Reconstruction; Computational Photography; Core Operations; Feature Detection and Description; Gui Features in OpenCV; Image Processing in OpenCV. I look at what it takes to setup object detection and tracking using OpenCV and Python code. 0\samples\python下のdemo. py or you can directly open fpt. This is much like what a green screen does, only here we wont actually need the green screen. Here a is alpha which defines contrast of the image. 1 and Python 3. Danh sách bài viết series OpenCV: Hashtag #OpenCV; Tut 1: Xử lý ảnh - OpenCV đọc ghi hình ảnh (code Python và C++) Tut 2: Xử lý ảnh - OpenCV resize, crop và padding hình ảnh (code Python và C++) Tut 3: Xử lý ảnh - OpenCV biến đổi mức sáng hình ảnh (code Python). Counting blue and white bacteria colonies with Python and OpenCV February 2, 2017 / Alvaro Sebastian / 1 Comment Last week I was teaching to my Polish students how to use the Python packages NumPy , SciPy and Matplotlib for scientific computing. Right now I ran the code and it works for me (Python 3. A video is composed of infinite frames at different time instants. pointPolygonTest(contour, pt, measureDist) 関数は点と輪郭を結ぶ最短距離を計算する関数である.指定された点 pt が輪郭 contour の外側にあれば負の値,内側にあれば正の値,輪郭上にあれば0を返す.. Download Python 3. 7 - Kindle edition by Alberto Fernández Villán. Contours can be explained simply as a curve joining all the continuous points (along the boundary), having same color or intensity. 저는 기존에 python 3. I decided to go with the color RGB(255,255,255), wherein 255 is the maximum value for each R-G-B respectively, which indicates all colors in the visible spectrum: white. Imagine we got this tasty apple and we want to put it in another image (with a green background):. getBoundingRect(largest_contour) Different behaviour of OpenCV Python arguments in 32 and 64-bit systems. T³: Color Object Detection with OpenCV and Python. I'm new to Python + OpenCV. In particular, the submodule scipy. The active contour model introduces several energy terms, and when the sum of internal and external energy is minimal, we got the contour we want, so what the algorithm do is actually updates the snake in order to minimize its total energy, that is a sum of internal energy that depends on the contour shape (the smoother contour is, the smaller. Additional informations: initRecorder: initialise the recorder with an arbitrary codec it can be changed with problems; in the run method no motion can be detected in the first 5 second because it is almost the time needed for the webcam to adjust the focus and the luminosity which imply lot's of changes on the image. convexHull (cnt). For this you need call the OpenCV  cv2. In this episode, we will learn how to use OpenCV functions to find the contours of the objects in an image. contour - The individual contour we are checking against. The following are code examples for showing how to use cv2. Ask Question Asked 6 years, 6 months ago. findContours(mask, cv2. Brush up on contour detection, filtering, and drawing Work with Augmented Reality to build marker-based and markerless applications Work with the main machine learning algorithms in OpenCV Explore the deep learning Python libraries and OpenCV deep learning capabilities Create computer vision and deep learning web applications Who this book is for. Gesture Recognition using OpenCV + Python This python script can be used to analyse hand gestures by contour detection and convex hull of palm region using OpenCV, a library used for computer vision processes. All the tests will be done using timeit. Python OpenCV 강좌 : 제 21강 - 윤곽선 검출 [ Python-OpenCV ] - 윤대희 공유하기. (const CvArr* contour)¶ Python:. Detect 80 common objects in context including car, bike, dog, cat etc. Just note that, regardless of what version the Python package has become, whether it's 3. We are going to compare the performance of different methods of image processing using three Python libraries (scipy, opencv and scikit-image). Contours can be easily extracted by thresholding the gray scale image. In this series we'll learn how to take advantage of this…. That is where Running Average comes in handy. It has C++, C, Python and Java interfaces and supports Ubuntu Linux. As mentioned in the first post, it’s quite easy to move from detecting faces in images to detecting them in video via a webcam - which is exactly what we will detail in this post. Check out the wikipedia page on Image Moments. resize() function. Contours can be seen as a curve joining all the points along the boundary of a certain shape. hconcat() to concatenate (combine) images vertically and horizontally with Python, OpenCV. Introduction to OpenCV OpenCV stands for the Open Source Computer Vision Library. Applying contour detection to a QR Code, the contour tracing the perimeter of the pattern polygons has the following characteristics - It is a contour with subsequent enclosed (nested) contours. We will detect the colour of every frame one by. We create a sizable window that automatically scales the displayed image with the cv2. To find the different features of contours, like area, perimeter, centroid, bounding box etc; You will see plenty of functions related to contours. In this OpenCV Python Tutorial blog, we will be covering various aspects of Computer Vision using OpenCV in Python. In computer vision tasks, we need to crop a rotated rectangle from the original image sometimes, for example, to crop a rotated text box. Contours come handy in shape analysis, finding the size of the object of. c++ opencv crop image-resizing image-segmentation |. findContours(image, mode, method[, contours[, hierarchy[, offset]]]). Contour Features; Contour Properties; Contours : Getting Started. We will briefly explain the algorithm and then follow up with C++ and Python code implementation using OpenCV. In this book, you’ll get started by setting up OpenCV and delving into the key concepts of computer vision. But we could not identify the shape of the object there. Think2Impact – A collaborative platform for Applied Systems Thinking → Image Background Removal using OpenCV in Python. a satisfactory moving image edge detection. Contours come handy in shape analysis, finding the size of the object of. To find the different features of contours, like area, perimeter, centroid, bounding box etc; You will see plenty of functions related to contours. Using findContours from OpenCV python module. Then we thresholded the masked image and get the contours. Document Scanner using Python + OpenCV Saturday, January 09, 2016 Even if we crop the image around the contour, the cropped content would not look like a scanned. com for a lot of great tutorials related to computer vision with OpenCV + Python. Allowing OpenCV functions to be called from. getBoundingRect(largest_contour) Different behaviour of OpenCV Python arguments in 32 and 64-bit systems. In this example, we have read an image and used ndarray. resize() function. Imagine we got this tasty apple and we want to put it in another image (with a green background):. Finger Tracking with OpenCV and Python. T³: Color Object Detection with OpenCV and Python. 4를 지원해주지 않는다고 해서 python 2. How to crop an image in OpenCV using Python. approxPolyDP()). So let's go through some of the things you can expect to do with OpenCV, starting from the basics. So checking distance to each contour is a time consuming process. resize() Following is the syntax of resize function in OpenCV:. Works in C, C++, and Python. By Philipp Wagner | May 26, 2012. Contours can be explained simply as a curve joining all the continuous points (along the boundary), having same color or intensity. 点とポリゴン(多角形)のテスト¶. Otherwise it will continue to extract frames from video infinitely. We can access height, width and number of channels from img. Find and Draw Contours using OpenCV | Python Contours are defined as the line joining all the points along the boundary of an image that are having the same intensity. I've been tinkering with Python and OpenCV for a while now, and thought I'd start an actual project. […] Comparing Shape Descriptors for Similarity using Python and OpenCV - May 30, 2014 […] sprites using Zernike moments. OpenCV was founded to advance the field of computer vision. Working with OpenCV is fun and once you learn the basics you will find it pretty easy. How can I crop images, like I've. Install Flask: pip3 install flask. To draw all contours, pass -1) and remaining arguments are color, thickness etc. Python OpenCV cv2 Tutorial covers basic and intermediate Image Processing techniques like: read image, working with color channels, finding contours, resizing, capturing video, etc. Document Scanner using Python + OpenCV Saturday, January 09, 2016 Even if we crop the image around the contour, the cropped content would not look like a scanned. We can at this point find the contours using the opencv built in function findContours. Create advanced applications with Python and OpenCV, exploring the potential of facial recognition. You will be introduced to third-party APIs and will be shown how to manipulate images. This tutorial is a follow-up to Face Recognition in Python, so make sure you've gone through that first post. This course will walk you through a hands-on project suitable for a portfolio. 0 (not utilized in python opencv) import cv2 import numpy as np Load the shape template or reference image. Python and OpenCV Example: Warp Perspective and Transform - May 5, 2014 […] In my previous blog post, I showed you how to find a Game Boy screen in an image using Python and OpenCV. Camera Calibration and 3D Reconstruction; Computational Photography; Core Operations; Feature Detection and Description; Gui Features in OpenCV; Image Processing in OpenCV. how to find the two points on one contour, which defines the diameter of the minimum enclosing circle of the contour? 2. The bad video quality makes the mask on the moving objects jumps a bit, and we need more smoothing and filtering. Example Python Script – OpenCV Get Image Size. Thanks for your question. opencv is available on Mac, Windows, Linux. [OpenCV-Python Tutorials] 19. The code is in python and you need to have openCV, numpy and math modules installed. ttf) and digit height. OpenCV (open source computer vision) is released under a BSD license and hence it’s free for both academic and commercial use. Use Cases: Cropping user-uploaded images, without cutting out faces. 本篇是前面两篇教程:给深度学习入门者的Python快速教程 - 基础篇给深度学习入门者的Python快速教程 - numpy和Matplotlib篇的番外篇,因为严格来说不是在讲Python而是讲在Python下使用OpenCV。. You can vote up the examples you like or vote down the ones you don't like. I will crop photos to get rid of background noise or to just focus more on the subject I was trying to capture. 4' into merge-3. python opencv image processing. Example Python Script - OpenCV Get Image Size. This piece of code shows how to sharpen a grayscale image (for color images do the same for each channel). Create advanced applications with Python and OpenCV, exploring the potential of facial recognition, machine learning, deep learning, web computing and augmented reality. In this tutorial, we shall the syntax of cv2. Take note that in OpenCV 3. ← OpenCV-Python Tutorials. Using the code snippets included, you can easily setup a Raspberry Pi and webcam to make a portable image sensor for object detection. print ("contours=", len (contours), "hierarchy=", len (hierarchy) ) 結果は、 contours= 7 hierarchy= 1 この場合は7本の輪郭を検出した 元画像に閉曲線は3つしか描いてないが、黒線の外側境界と内側境界で2つづつ検出されている. Contours is a Python list of all the contours in the image. To do contours detection OpenCV provide a function called FindContours which intent to find contours in the image. MATLAB ® and OpenCV are complementary tools for algorithm development, image and video analysis, and vision system design. Posted by: admin November 25, 2017 Leave a comment. Hence, I decided to write this article detailing the different (common) functions inside OpenCV, their applications, and how you can get started with each one. This is much like what a green screen does, only here we wont actually need the green screen. Python and OpenCV Example: Warp Perspective and Transform - May 5, 2014 […] In my previous blog post, I showed you how to find a Game Boy screen in an image using Python and OpenCV. Contours can be seen as a curve joining all the points along the boundary of a certain shape. Python OpenCV 강좌 : 제 21강 - 윤곽선 검출 [ Python-OpenCV ] - 윤대희 공유하기. OpenCV is written in C, but there are bindings for Python and actually PHP. 使用opencv-python对图像进行resize和填充在图像输入神经网络之前,需要进行一定的处理,假设神经网络的图像输入是256256然后进行了224224的randomcrop。我们需要进行如下 博文 来自: 攻城狮的自我修养. Gesture Recognition using OpenCV + Python Saturday, March 21, 2015 This python script can be used to analyse hand gestures by contour detection and convex hull of palm region using OpenCV, a library used fo. Extracting Contours with OpenCV. Python and OpenCV Example: Warp Perspective and Transform - May 5, 2014 […] In my previous blog post, I showed you how to find a Game Boy screen in an image using Python and OpenCV. In this post, I would like to introduce how to do this in OpenCV. Python Image Processing With OpenCV There are many image processing packages for Python. Python OpenCV cv2 Tutorial covers basic and intermediate Image Processing techniques like: read image, working with color channels, finding contours, resizing, capturing video, etc. Removing contours from an image using Python and OpenCV – PyImageSearch. Background extraction comes important in object tracking. Example Python Script – OpenCV Get Image Size. Android phone is running a VNC server (vnc server & viewer are both slow!). 4/C++/GPU, Python 2. In other words, contours represent the shapes of objects found in an image. Early Access puts eBooks and videos into your hands whilst they’re still being written, so you don’t have to wait to take advantage of new tech and new ideas. Posted on September 8, 2017 by Ajinkya Patil. (const CvArr* contour)¶ Python:. Python OpenCV 강좌 : 제 21강 - 윤곽선 검출 [ Python-OpenCV ] - 윤대희 공유하기. OpenCV provides many functions to properly detect and process contours. NOTE: Are you interested in machine learning? You can get a copy of my TensorFlow machine learning book on Amazon by clicking HERE In my previous tutorial, Color Detection in Python with OpenCV, I discussed how you could filter out parts of an image by color. Reply Delete. Otherwise it will continue to extract frames from video infinitely. To do contours detection OpenCV provide a function called FindContours which intent to find contours in the image. 1 and Python 3. Contours come handy in shape analysis, finding the size of the object of interest, and object detection. In computer vision tasks, we need to crop a rotated rectangle from the original image sometimes, for example, to crop a rotated text box. Additional informations: initRecorder: initialise the recorder with an arbitrary codec it can be changed with problems; in the run method no motion can be detected in the first 5 second because it is almost the time needed for the webcam to adjust the focus and the luminosity which imply lot's of changes on the image. Although looking at an Identification marker, you would expect to detect 3 'nested' contours, however the inner boundary is also accounted as a contour. If you haven't yet installed OpenCV, you can check here how to do it. Ask Question i do use opencv and cv2 for python. You can crop, adjust, or rotate images. In this tutorial we will check how to read an image and convert it to gray scale, using OpenCV and Python. opencvを用いた画像処理を行っています。 内容は、赤色だけを囲う(バウンディングボックス)の様なものを作りたいです。. Определение контуров отсканированных фотографий при помощи OpenCV. If you need a short tutorial about how to get started with OpenCV 4 programming in Python 3. In this tutorial, we shall the syntax of cv2. a satisfactory moving image edge detection. How to Crop Video from Webcam using OpenCV There will undoubtedly be times when you need to crop your video to delete unnecessary information and draw your viewers' attention to the most important elements. This piece of code shows how to sharpen a grayscale image (for color images do the same for each channel). In this article, we will learn how to find the co-ordinates of Contours with the help of OpenCV. js, although there is a library node-opencv, with less implemented features and an inconsistent API. Works in C, C++, and Python. opencv / samples / python / contours. com OpenCV Python Tutorial For Beginners 13. OpenCV and Python (Documentation) Download. Как обрезать эту часть изображения внутри прямоугольника?. The following few posts are a fallout from the Kaggle Diabetic Retinopathy Detection competition. Learn how to detect and track a particular colour using Python and OpenCV. OpenCV-Python Tutorials. *FREE* shipping on qualifying offers. The idea here is to find the foreground, and remove the background. Gesture Recognition using OpenCV + Python Saturday, March 21, 2015 This python script can be used to analyse hand gestures by contour detection and convex hull of palm region using OpenCV, a library used fo. It should be noted that the above code assumes you are using OpenCV 2. We will detect the colour of every frame one by. OpenCV (Open source computer vision) is a library of programming functions mainly aimed at real-time computer vision. To draw all the contours in an image:. In this article, we will learn how to find the co-ordinates of Contours with the help of OpenCV. Use Cases: Cropping user-uploaded images, without cutting out faces. You can find my code on GitHub. Find Contours in the image ( image should be binary as given in your question) 2. Since findContours() will edit the image that is inputed, we instead inputted a copy of the thresholded image (which we might need to view later for debugging purposes). To perform image manipulations such as transformations, cropping, blurring, thresholding, edge detection and cropping. OpenCV: Operations on arrays hconcat() OpenCV: Operations on arrays vconcat() Pass a list of images (ndarray), an image (ndarray) in which the ima. Practical OpenCV 3 Image Processing with Python : Extracting Contours from Images | packtpub. We can access height, width and number of channels from img. OPENCV(11)--contours and convex hull(輪廓與凸包) 第二個返回值"輪廓"是一個Python 清單(list),其中存儲這圖像中的所有輪廓。. Cross-Platform C++, Python and Java interfaces support Linux, MacOS, Windows, iOS, and Android. Session 4: Installing Sublime Text Editor for Ubuntu. Sharpening is performed by applying a Laplacian operator on the image and adding the output to the original image. If there is another contour inside a hole of a connected component, it is still put at the top level. Contours - 1 : Getting Started Hi, this article is a tutorial which try to cover all relevant functions in OpenCV dealing with Structural Analysis and Shape Descriptors , which are mainly related to contours. But we could not identify the shape of the object there. This tutorial is a follow-up to Face Recognition in Python, so make sure you've gone through that first post. This program demonstrates. for f in faces: x, y, w, h = [ v for v in f ] Once we have each vertex, we can draw a triangle. All Explained. OpenCV modules; OpenCV-Python Tutorials. Right now I'm working on the Machine Learning part of my OCR project. x, the definition of cv2. This is much like what a green screen does, only here we wont actually need the green screen. After creating the contour images the function to find biggest contour is called where contour scanner used to scan through each contour and find biggest contour. In this article, I talked about some interesting features of the popular OpenCV library used in Node. _, contours, _ = cv2. T³: Color Object Detection with OpenCV and Python. is does this effectively for user profile images. Applying contour detection to a QR Code, the contour tracing the perimeter of the pattern polygons has the following characteristics - It is a contour with subsequent enclosed (nested) contours. drawContours() contours(윤곽)이란? 윤곽선은 동일한 색상 또는 강도를 갖는 모든 연속 점 (경계를 따라)을 결. By Philipp Wagner | May 26, 2012. Takes a few seconds. Contours : Getting. 7 - Kindle edition by Alberto Fernández Villán. Alternatively, you could also specifically filter out a specific color, and then replace it. Follow along, if you want to understand what's the simple idea behind the implementation. There is Python code in this article so be ready with your Notebooks!. One of them is the PIL, and comes with the distribution Anaconda. I decided to go with the color RGB(255,255,255), wherein 255 is the maximum value for each R-G-B respectively, which indicates all colors in the visible spectrum: white. 1? I tried this on a VM but obviously that is useful to do if you want to work with Python 2. 儲存 OpenCV 圖片. 11: OpenCV install on Ubuntu (0) 2015. Crop some piece of the video frame using opencv python in raspberry pi. Below is my piece of code in OpenCV-Python. Motivation¶. Contour 응용 1 이번 시간에는 contour의 호, 둘레와 근사법 등등의 폐곡선 Contour의 특성에 대해 알아보겠습니다. You can vote up the examples you like or vote down the ones you don't like. Note that this performs cropping on the masked image - that is the image that removes everything but the information contained within the largest contour. Since findContours() will edit the image that is inputed, we instead inputted a copy of the thresholded image (which we might need to view later for debugging purposes). So let's go through some of the things you can expect to do with OpenCV, starting from the basics. findContours(image, mode, method[, contours[, hierarchy[, offset]]]). In this book, you'll get started by setting up OpenCV and delving into the key concepts of computer vision. I look at what it takes to setup object detection and tracking using OpenCV and Python code. How to Crop OpenCV Image using Mouse Click and Movement in Python Click and Crop Image You can easily crop an image using mouse clicks on OpenCV. To segment images by understanding contours, circle, and line detection. Ask Question i do use opencv and cv2 for python. The program allows the detection of a specific color in a livestream video content. Android phone is running a VNC server (vnc server & viewer are both slow!). Much of ROS makes use of 3D sensors and point-cloud data, but there are still many applications that use traditional 2D cameras and image processing. To find the different features of contours, like area, perimeter, centroid, bounding box etc; You will see plenty of functions related to contours. Simple Digit Recognition OCR in OpenCV-Python. OpenCV motion detection and tracking. Number Plate Detection in OpenCV - Python. OpenCVを使ったPythonでの画像処理について、輪郭の検出(Contour Detection)を扱います。輪郭検出にはfindContours()で目的に合ったRETRモードと近似を、描画にはdrawContours()を使います。. We will briefly explain the algorithm and then follow up with C++ and Python code implementation using OpenCV. Take note that in OpenCV 3. Crop black border of image using NumPy. OpenCV's SimpleBlobDetector will be the primary function that we will be using. In this book, you’ll get started by setting up OpenCV and delving into the key concepts of computer vision. Contours are defined as the line joining all the points along the boundary of an image that are having the same intensity. It's used to process images, videos, and even live streams, but in this tutorial, we will process images only as a first step. Installing into a Virtualenv. py脚本并插入以下代码:. There is Python code in this article so be ready with your Notebooks!. This full hierarchy is built and shown in the OpenCV contours. Session 4: Installing Sublime Text Editor for Ubuntu. 7, scikit-image, PIL, etc. CHAIN_APPROX_NONE) We loop trough the countours and we draw each single one. In other words, contours represent the shapes of objects found in an image. Crop Rectangle, возвращаемый minAreaRect OpenCV. OpenCV images are stored as three-dimensional NumPy arrays. If there is another contour inside a hole of a connected component, it is still put at the top level. findContours(image, mode, method[, contours[, hierarchy[, offset]]]). Below is my piece of code in OpenCV-Python. How To: I'm going to do this using Python. It’s used to process images, videos, and even live streams, but in this tutorial, we will process images only as a first step. YOLO Object Detection with OpenCV and Python. The idea here is to find the foreground, and remove the background. OpenCV and Python (Documentation) Download. You will find the whole source at the end of this article. Use Python, OpenCV libraries and the PYNQ frame to implement the computer vision on Arty Z7-20 Xilinx Zynq SoC platform. for f in faces: x, y, w, h = [ v for v in f ] Once we have each vertex, we can draw a triangle. In this OpenCV with Python tutorial, we're going to cover how to create a sort of filter, revisiting the bitwise operations, where we will filter for specifically a certain color, attempting to just show it. findContours(thresh, cv2. This guide doesn't introduce any new OpenCV functions you shouldn't already be familiar … Continue reading Open Multiple Images with OpenCV in Python →. 7, scikit-image, PIL, etc. Now we have a frame with skin color regions only, but what we really want is to find the location of a fingertip. Detect a Green Color Object with OpenCV. Python OpenCV cv2 Find Contours in Image. imread() function. we look for the four contours that span the most area-- which have to be the four cards themselves. How to Crop OpenCV Image using Mouse Click and Movement in Python Click and Crop Image You can easily crop an image using mouse clicks on OpenCV. Just note that, regardless of what version the Python package has become, whether it's 3. YOLO Object Detection with OpenCV and Python. A popular computer vision library written in C/C++ with bindings for Python, OpenCV provides easy ways of manipulating color spaces. Early Access puts eBooks and videos into your hands whilst they’re still being written, so you don’t have to wait to take advantage of new tech and new ideas. Thank you for going through this OpenCV tutorial. A video is composed of infinite frames at different time instants. This tutorial is a follow-up to Face Recognition in Python, so make sure you’ve gone through that first post. arcLength (contour, True) * 0. CHAIN_APPROX_NONE) We loop trough the countours and we draw each single one. If you are a total noob like me, I am still getting used to knowing that the CV in OpenCV means Computer Vision! Actuallly, I recalled that I did try to get into OpenCV few years back ago, when I knew no Python and when Python opencv module was probably still early. OpenCV-Python 基本都封装好的接口,只需一两行代码就能完成,在实际项目开发中非常方便。 我们编程教室之前的“每周一坑”栏目里,和图像相关的题目基本都可以用 OpenCV-Python 来解决。. The following are code examples for showing how to use cv2. OpenCV was designed for computational efficiency and with a strong focus on real-time applications. Reply Delete. In this introductory tutorial, you'll learn how to simply segment an object from an image based on color in Python using OpenCV.