Opencv thinning python.
Opencv thinning python I have a question converting from Scikit-Image to OpenCV: I’ve been trying to do this using OpenCV instead, but have been struggling to getting results as the above. This example illustrates skeletonization perfectly 10 Mindblowing Python OpenCV Projects with Code. Feb 8, 2022 · thinning must maintain the tree structure of the component, so that's checked off. Jul 22, 2019 · 然后这一篇博客呢是我对这个细化算法的解读与实操~一、thinning algorithm算法描述图像细化(Image Thinning)，一般指二值图像的骨架化(Image Skeletonization)的一种操作运算。切记：前提条件一定是二_opencv thinning Aug 8, 2020 · 前回の細線化(スケルトン化)記事の中で、Scikit-Imageモジュールを使って細線化を行いました。前回の細線化記事 Emotion Explorer - Scikit-Imageの細線化(Skeletonize)をOpenCVと組み合わせて試す。探し方が悪く、OpenCVには細線化が無いんだと思っていたら、ありました。関数dst = cv. All pixels are tested and pixels satisfying all the following conditions (simultaneously) are just noted at this stage. thinning。关于部分帖子说opencv-contrib-python和python-opencv不能共存实为谬论。 import cv2 import numpy as np img = cv2. Fourth argument is aperture_size. array(sk, dtype=np. 2 days ago · Python: cv. Member Function Documentation getRegularizationParameter() Looking for a thinning/skeletonizing algorithm with opencv in python. So for this purpose, OpenCV has a function, cv. 画像を線画にする処理をスケルトン化というらしい。 Opencv Canny边缘检测 滞后阈值; Opencv 霍夫变换; Opencv NMS; Opencv 霍夫逆变换; Opencv 膨胀; Opencv 腐蚀; Opencv 开运算; Opencv 闭运算; Opencv 形态学梯度; Opencv 顶帽; Opencv 黑帽; Opencv 使用误差平方和算法进行模式匹配; Opencv 使用绝对值差和进行模式匹配; Opencv 使用归一化交叉 May 8, 2015 · 图像细化（ Image Thinning ），一般指二值图像的骨架化（ Image Skeletonization ） 的一种操作运算。 所谓的细化就是经过一层层的剥离，从原来的图中去掉一些点，但仍要保持原来的形状，直到得到图像的骨架。骨架，可以理解为图象的中轴。 Pure Python (slow) Python using C API (compiled from C using SWIG, compatible with numpy and opencv) Java (includes a Processing demo) OpenFrameworks addon (friendly wrapper on C++ version) C# (demo script for Unity Engine) Go (parallelized with goroutines) Swift (demo with NSImage and AppKit) Rust (simple rust implementation) Jul 17, 2023 · python opencv图像细化，#PythonOpenCV图像细化实现指南##介绍在本文中，我们将学习如何使用Python和OpenCV库来实现图像细化。图像细化是一种常见的图像处理技术，用于减小图像中线条或边缘的宽度，从而提高图像的清晰度和质量。 Jun 7, 2016 · Python / C++ X. uint8) sk *= 255 Note that, when dealing with NumPy arrays, you generally don't need to loop over all pixels. thinning()来实现。这个函数可以将二值图像进行细化，最终得到物体的骨架结构。它的具体用法如下： python import cv2 # 读取图像. Morphological thinning, implemented in the thin function, works on the same principle as skeletonize: remove pixels from the borders at each iteration until none can be removed without altering the connectivity. Background: I have been looking for fast thinning algorithms to to use in the determination of fingerprint minutiae, but I didn't find any and OpenCV appers to have none either. 图像细化 （Image Thinning），一般指二进制图像的骨架化（Image Skeletonization） 的一种操作运算。 细化是将图像的线条从多像素宽度减少到单位像素宽度过程的简称； 骨架提取 与图像细化类似，都是指将二进制图像中一部分像素去掉后，剩下的像素仍然能保持原来的形状，形成图像的骨架。 4 days ago · We manually created a structuring elements in the previous examples with help of Numpy. can anybody tel me how to get the mean of the skeleton joint coordinates of a video taken from kinect xbox. applyTransformation() which only accepts np. I tried all sort of opencv processing and applied findContours, but wasn't able to catch this. More Jul 3, 2017 · You don't have to rebuild to use it. Detailed Description. Jul 11, 2023 · 图像细化（Thinning）是一种常用的图像处理算法，它可以将图像中的线条、边缘等细化成一条像素宽度的线条，从而减少图像数据量，提高图像处理速度。 在Python中，可以使用OpenCV库中的函数cv2. 算法原理. 6k次，点赞3次，收藏30次。文章目录笔记_4图像细化thinning 图像细化函数轮廓检测findContours 轮廓检测函数drawContours 轮廓绘制函数contourArea 计算轮廓面积：返回值 double类型arcLength 计算轮廓长度：返回值 double类型轮廓外接多边形boundingRect 给定轮廓的外接矩形minAreaRect 给定轮廓的最小外接 Dec 29, 2017 · Hey guys, im trying to do skeletonization for this image using python 3. The images look very twisted and incorrect. L. Aug 15, 2022 · @AyushYadav OpenCV's thinning/skeletonize algorithm is part of the contribution module; There's no implementation in the main module. You switched accounts on another tab or window. Python: cv. In fact, it's worth trying to avoid doing so, as loops in Python are extremely slow. 常见的二值图像中心线提取算法包括细化(thinning)和骨架化(skeletonization)。. thinning is a function in the OpenCV library that performs thinning on binary images. however, I don't believe that opencv has any "thickening". After iterating over the image and collecting all the pixels satisfying all Jan 22, 2020 · You should try OpenCV's smoothing operations. It is rectangular shape. 20-dev. It is also known as skeletonization. Here is the code that I Dec 10, 2020 · I tried 'thinning' and 'skeletonizing' algorithms from python's scikit learn library. imread("image. cn / simple There is a bug for function tps. dst: The destination estimated covariance matrix. How to match two images and find out mistakes. THINNING_GUOHALL Jan 6, 2022 · I am using the Python OpenCV2 implenentation of the thin plate transformer and running into some issues. This algorithm is used for thinning binary image. . imread("opencv. morphologyEx, erosion, image processing, Image Skeleton, morphological image processing, morphological operations, opencv python, Opening and Closing opencv, skeletonisation opencv, Skeletonization, Skeletonization opencv, thickening opencv python, Thinning opencv on 31 Jul 2019 by kang Jan 8, 2013 · OpenCV 3. Sep 17, 2020 · Profiling thinning() in VisualStudio2017 i have discovered that it takes a crazy amount of time in Mat. I have the following problem: I want to skeletonize the tracks of a chip but when i use the thinning function (which is an implementation of the Zhang-Suen skeletonization algorithm) some important edges get lost. Please advice me for python(3. at(). 4. zeros_like(img) skeleton = cv2. My goal now is to create an algorithm that can dr Feb 8, 2022 · thinning must maintain the tree structure of the component, so that's checked off. uint8 and multiply by 255: sk = np. 6k次，点赞5次，收藏16次。本文介绍了如何使用OpenCV的扩展模块opencv-contrib-python提取图像中心线，包括环境配置、代码实现及建议的学习资源。通过Otsu阈值处理和thinning函数，展示了简单的步骤和一个示例应用。 Jan 7, 2020 · In simpler words, Skeletonization makes a BLOB very thin (typically 1 pixel). 0-dev. Drawing Histogram in OpenCV-Python. Y. Thinning is the operation that takes a binary image and contracts the foreground until only single-pixel wide lines remain. Skeletonization using OpenCV-Python. When you run canny on the image how would you distingiush between the two top lines and the left line. smooth edges Detailed Description. framework • Option 1: Pre-built binaries for iOS • Option 2: Build from source • Tutorials 5 • Include the Tegra optimized OpenCV makefile: OpenCV-[version]-Tegra-sdk/sdk/ native/jni/OpenCV-tegra3. -- I see that leptonica refers to a paper looks implementable. Sharpen also didnt uniformly reduce the line thickness. COLOR_RGB2GRAY)) In this, we can implement thinning either using erosion and opening operations or by using hit-or-miss operation. Python3. This transform is also the basis of more advanced morphological operations such as thinning or pruning. 2 부터 도입된 cv:: ximgproc:: thinning() 을 이용해서 라인골격을 생성합니다. For this purpose, you will use the following OpenCV functions: erode() dilate() getStructuringElement() May 27, 2022 · 开源的图像细化算法都重形不重意，大家能看到的都是一些很初级的代码，能得到结果，但是真的拿来做项目，那都是浮云。本文尝试集中几种优化手段来提高响应代码的速度，从传统的C优化到后续的SIMD指令集处理，算法速度有很大的提高。 Jul 14, 2020 · 文章浏览阅读2. Oct 7, 2024 · Hello all! Apologies for past twice in the past couple of weeks. 10. Nov 10, 2011 · I'm looking for a fast thinning algorithm that can be readily implemented using OpenCV. Second and third arguments are our minVal and maxVal respectively. 3w次，点赞10次，收藏107次。点击上方“小白学视觉”，选择加"星标"或“置顶”重磅干货，第一时间送达本文转自|AI算法与图像处理问题前几天有个人问了我一个问题，问题是这样的，他有如下的一张二值图像：_opencv 中心线提取 Jan 25, 2021 · Dear all, I am trying to warp an image using the thinplatespline but after warping, the image contains only 0 values. x calls - wutachiang/edgeThinning For use with Python, OpenCV must be installed, built with Python support. But in some cases, you may need elliptical/circular shaped kernels. 2, OpenCV4. cv :: findContours() 를 이용하여 생성된 골격의 외곽선을 생성합니다 위의 이미지에서 생성된 외곽선은 2 개의 contour 를 형성할것입니다 . 04 opencv-contrib-python 4. So, this has the effect of thinning the connected component in your image. 0. tsinghua. Hit-or-Miss theory Oct 6, 2013 · OpenCV Tutorial 1 - Add OpenCV on API 8. I have tried to realize some of them before. See the result I got for the above sample image. I'm trying to overlay an outline on an image where the outline was made from a mask. Canny() to get the outline of the mask, then changing that to a color using cv2. It's in C++, but can be easily ported to python since most are OpenCV functions. (Han) 2 days ago · Apply two very common morphology operators (i. OpenCV中处理图像细化的函数可能包括cv::thin()等，但需要注意的是，OpenCV 4. – pip3 install opencv-contrib-python # or use below code image for faster download if you are in China pip3 install opencv-contrib-python-i https: // pypi. (论文找不到了=. Feb 19, 2022 · In this article, we will see how we can do the skeletonization of images by thinning in mahotas. thinning`来实现骨架提取。该函数可以将二值图像细化为一个单像素宽度的骨架。 python thinned = cv2. What can I do here? I would like these lines to be the same width everywhere Jul 28, 2023 · 一旦图像被二值化，我们就可以开始进行骨架提取了。在OpenCV中，我们可以使用函数`cv2. 3) opencv. Feb 29, 2016 · Guo and Hall thinning algorithm ===== This is a Python 3 module of Guo and Hall* thinning algorithm implemented in C. The functions in this section use a so-called pinhole camera model. imshow("filename",skeleton Zhang-Suen thinning algorithm using OpenCV（C++) wrapped by boost-python for python3. morphologyEx, erosion, image processing, Image Skeleton, morphological image processing, morphological operations, opencv python, Opening and Closing opencv, skeletonisation opencv, Skeletonization, Skeletonization opencv, thickening opencv python, Thinning opencv on 31 Jul 2019 by kang Morphological thinning. Use the routine to thin the following image and show the output here on this page as either a matrix of ones and zeroes, an image, or an ASCII-art image of space/non-space characters. I will show the results below, but in the bottom of the images the output is not what I expected. Aug 4, 2016 · 用途は色々あるのですが、画像処理ライブラリのOpenCVになぜか細線化のメソッドが無かったので、 勉強も兼ねて自分で実装しました。 速さが欲しい場合こちらへどうぞ。 #細線化のアルゴリズム 細線化にはいくつかのアルゴリズムが提案されています。 2 days ago · In this tutorial you will learn how to find a given configuration or pattern in a binary image by using the Hit-or-Miss transform (also known as Hit-and-Miss transform). Could not find anything in the official documentation. Two steps will be successively applied to the image. Threshold doesnt get rid of all of the gray and when it does the lines are too fat. Based on my experience, I think you need to use a median blur with a kernel area of maybe around 9 (although it depends on what you want). cvtColor() then finally converting that edge to cyan using outline[np. thinningメソッドを使用します。もし使用しない場合、線図の線が枝分かれしてる箇所で2重線となり、領域が分かれてしまいます（下図）。 ライブラリのインストール pip install opencv-contri… Optimized OpenCV extra algorithms for Python2/3. By default it is 3. ; There are 4 different opencv packages: opencv-python, opencv-contrib-python, opencv-python-headless, opencv-contrib-python-headless. Open Source Computer Vision Python: cv. edu. Unfortunately, none of these functions are implemented in OpenCV. 17. 2w次，点赞8次，收藏67次。一、问题描述同学偶然问我问题，怎么画出一个轮廓的中心轮廓。然后我回去查了一下，其实发现这个其实有专门的算法叫做细化算法。 Dec 12, 2024 · 下载包opencv-contrib-python，更新到最新版本，即可使用ximgproc. Generated on Sun Jun 2 2024 21:52:15 for OpenCV by Mar 10, 2025 · You signed in with another tab or window. pyplot as plt # 导入Matplotlib用于可视化 步骤 3: 读取图像. Apr 21, 2021 · 文章浏览阅读1. the math foundation makes it look like that's a simple thing to do (thinning/thickening duality). I see that lee's skeletonize method produces a result that comes most close to my desired output, but its not good enough yet. The view of a scene is obtained by projecting a scene's 3D point \(P_w\) into the image plane using a perspective transformation which forms the corresponding pixel \(p\). The mention of the library is because there are certain things that can be done in a jiffy in say, Mathematica or MATLAB which would require lines of handcode in OpenCV+C. ; Draw each contour with thickness=CV_FILLED. 20 Detailed description python 111. Hit-or-Miss theory This entry was posted in Image Processing and tagged cv2. 60, opencv-contrib-python4. The original source applies the structuring elements after one another, not at the same time. First argument is our input image. Load the image; Convert to grayscale; Binaryze the image (threshold) Thinning, to have thin contours and help findContours; Get contours Jun 4, 2021 · The images I am working on are like this one The main goal is to calculate the crease (the blue line like shown in this image) The idea is that I have to find the center curved line of this image, detect its two … All you have to do is, Find contour. OpenCV的图像细化的骨架提取方法在扩展模块中，因此需要直接安装opencv-python的扩展包。此外还可以通过形态学的膨胀与腐蚀来实现二值图像的骨架提取，下面的代码实现就是分别演示了基于OpenCV的两种骨架提取方法。代码分别如下： Jun 16, 2023 · 文章浏览阅读4. Is anyone able to help pl Jul 15, 2024 · 通过Python，我们可以使用现有的图像处理库如OpenCV或Scikit-Image来实现这一技术，从而加速开发过程并提高图像处理的效率。 2. Oct 16, 2020 · In my image processing project, I have already obtained a masked image (black-and-white image) and its contours using the cv. 每个算法分别基于 CUDA 和 OpenCV 实现。OpenCV是正常串行版本，CUDA是并行迭代版本。以下是六篇论文： DP. I’ve added below the result of a bit of pre-processing and running Canny edge detection. Reload to refresh your session. Jul 6, 2023 · 遍历考察所有的非零点 看是否满足下面四个条件比如 有一个非零点的八邻域是下面情况，判断该点是否满足下述条件：① 2<= (p2+p3+p4+p5+p6+p7+p8+p9) <=6 5 days ago · In this tutorial you will learn how to find a given configuration or pattern in a binary image by using the Hit-or-Miss transform (also known as Hit-and-Miss transform). 0, Scikit-Image0. 常见的二值图像中心线提取算法包括细化(thinning)和骨架化(skeletonization)。 Oct 23, 2017 · I'm using OpenCV to do some image processing on Python. 5 days ago · src: The source image. Mostafa Sataki ( 2013-01-31 07:14:26 -0600 ) edit Sep 22, 2021 · I'm having a hard time detecting the thin black line in the following image. Bookstein (PAMI 1989). Function Documentation Generated on Tue May 20 2025 23:08:46 for OpenCV by Mar 15, 2021 · 《OpenCV-Python瓶口缺陷检测项目解析》 在计算机视觉领域，OpenCV库是一个强大的工具，它提供了丰富的函数和算法用于图像处理和计算机视觉应用。在这个“opencv-python瓶口缺陷检测小项目”中，我们将深入探讨如何 Sep 20, 2023 · 文章浏览阅读3. skeletonize works by making successive passes of the image. thinning(src[, dst Aug 5, 2021 · To create an array compatible with OpenCV simply cast to np. getStructuringElement(). x or python2. 12. Nov 28, 2016 · 要与 Python 一起使用，必须安装 OpenCV，并使用 Python 支持构建。 由于C#中无法直接调用OpenCV中的cv2. I am attaching a working code example and the datasets as well. Oct 13, 2015 · The first is to use some kind of morphological thinning that successively erodes away pixels from the boundary (while preserving the end points of line segments) until no more thinning is possible, at which point what is left approximates the skeleton. Do you have any ideas what I can do using OpenCV and Python to achieve that (to get an image similar to the one on the right)? I would like to especially get rid of those little thorns and to smooth the edges. I want to keep just the main line. mk • Tutorials Android iOS Aug 26, 2022 · # OpenCV Python骨架提取在计算机视觉领域中，骨架提取是一种常见的图像处理技术，用于从图像中提取目标的主要结构或轮廓。在本文中，我们将介绍如何利用OpenCV和Python来进行骨架提取，以及如何应用这一技术在图像处理中。## 什么是骨架提取？ Sep 15, 2013 · 前面一篇教程中，我们实现了Zhang的快速并行细化算法，从算法原理上，我们可以知道，算法是基于像素8邻域的形状来决定是否删除当前像素。还有很多与此算法相似的细化算法，只是判断的条件不一样。在综述文章， Thinning Methodologies-A Comprehensive Survey中描述了 So far I have tried many methods to simply enhance the image and skeletonize it. image = cv2. 在你的Python代码中，首先需要导入所需的库： import cv2 # 导入OpenCV库 import numpy as np # 导入NumPy库 import matplotlib. imread('filename', 0) skeleton = np. 2. To use the thinning function, simply copy the thinning() and thinningIteration() function to your Skeletonization reduces binary objects to 1 pixel wide representations. 1可能不直接提供图像细化的高级函数，因此开发者可能需要根据图像细化的原理自己编写算法或调用其他库。 在配置开发环境时，需要确保 Jul 16, 2024 · 通过Python，我们可以使用现有的图像处理库如OpenCV或Scikit-Image来实现这一技术，从而加速开发过程并提高图像处理的效率。 2. 1. morphologyEx, erosion, image processing, Image Skeleton, morphological image processing, morphological operations, opencv python, Opening and Closing opencv, skeletonisation opencv, Skeletonization, Skeletonization opencv, thickening opencv python, Thinning opencv on 31 Jul 2019 by kang Jan 18, 2016 · I am trying to find out if there is Guo Hall thinning in latest openCV. It is the size of Sobel kernel used for find image gradients. Then you can simply use zhang-suen thinning implementation like this: image = cv2. 我们将读取一张图像进行处理。 Jan 8, 2013 · Canny Edge Detection in OpenCV . float32 data type This entry was posted in Image Processing and tagged cv2. 60 Operating System / Platform => Windows10 64 Bit Compiler => python3. Thinning can also be obtained with hit or miss transform. A brief outline of the method, comments in the code should help, too. 7 Detailed description I am installed opencv-python4. Nov 21, 2020 · 画像の細線化(スケルトン化) 2020/11/21. This function is standard and is implemented in opencv, here are some python examples, and here is a link to the documentation (c++). mk to Android. Nov 24, 2023 · 说明本机上已经成功安装 opencv-contrib-python， opencv-python ，opencv-python-headless模块，但是为什么还会报错module ‘cv2’ has no attribute 'ximgproc’呢？ 由于版本不一致的问题导致的。 将opencv-contrib-python升级为 opencv-python 一致的版本即可解决. Input image must be of a complex type. e. How to update Bayes NormalClassifier? Draw seam (for testing). morphologyEx, erosion, image processing, Image Skeleton, morphological image processing, morphological operations, opencv python, Opening and Closing opencv, skeletonisation opencv, Skeletonization, Skeletonization opencv, thickening opencv python, Thinning opencv on 31 Jul 2019 by kang Sep 8, 2020 · 本文深入探讨了OpenCV中骨架提取的功能，详细介绍了如何利用Zhang-Suen和Guo-Hall算法进行图像骨架化处理。通过解析源代码，提供了具体的实现步骤和迭代过程，适用于图像处理和计算机视觉领域的研究与应用。 Feb 10, 2022 · pythonとopencvを使って画像処理を勉強していきます。 前回 python+opencvで画像処理の勉強4 周波数領域におけるフィルタリング 周波数フィルタリングについて学びました。 python+opencvで画像処理の勉強5 幾何学的変換 Oct 12, 2023 · thinning_zhangsuen细化算法和thinning_guohall细化算法都是常用的图像细化算法，用于提取图像的骨架。它们之间的主要差异在于细化过程中的迭代规则和收敛条件。 1. Maybe you can morphologically approximate the algorithm using erosion and bitwise operations. py Traceback (most recent call last): File "111. all(axis OpenCV for Mobile Platforms • Include OpenCV. I’ve been struggling a bit on my project regarding aligning astronomical images nonlinearly. I'm hoping to use Guo-hall or Zhang-Suen thinning algorithms to skeletonize this image. opencv_contribとは opencv_contribとは、contributorによって寄贈された拡張モジュール群です。 This entry was posted in Image Processing and tagged cv2. This package implements the thinning algorithm by Guo and Hall* for Feb 3, 2021 · I have a number of plants that I want to analyze the stem and they produce skeletons like this one. 4 days ago · OpenCV 4. where((outline == [255,255,255]). Open Source Computer Vision. Additional Global Threshold methods. Skeletonization is a process for reducing foreground regions in a binary image to a skeletal remnant that largely preserves the extent and connectivity of the original region while throwing away most of the original foreground pixels. You just pass the shape and size of the kernel, you get the desired kernel. It often makes me feel uncomfortable. See the tutorial in opencv-code. The different rules of removal can speed up skeletonization and result in different final skeletons. Therefore, I set out to read the paper about Thin Plate Warping and dig deep into the OpenCV implementation to get a better insight into the method. com) Jul 31, 2019 · This entry was posted in Image Processing and tagged cv2. Now for each contour apply thinning algorithm as explained here. mk • Tutorials Android iOS May 14, 2025 · Write a routine to perform Zhang-Suen thinning on an image matrix of ones and zeroes. OpenCV puts all the above in single function, cv. 0. Methods I tried; Local Histogram Equalization (11x11 neighborhood) + Binarization with Adaptive Thresholding + Morphological Thinning (With Erode+Dilate+Substract so called White Top Hat). 6. Nov 15, 2020 · 在对图像处理时有需要对图像进行细化处理的需求，提取出图像的骨架信息。所谓的细化就是经过一层层的剥离，从原来的图中去掉一些点，但仍要保持原来的形状，直到得到图像的骨架。骨架，可以理解为图象的中轴。 源… Jan 5, 2021 · Hey OpenCV Community! I am currently working on a hardware reverse engineering project. 0-1ubuntu1~22. Let’s first discuss thinning using erosion and opening. Single Image Depth Map / Sharpness Map. (GH) "Han, La, Rhee - 1997 - An efficient fully parallel thinning algorithm". You can simply pip install contrib with: pip install opencv-contrib-python. com) Oct 17, 2024 · Your suggestions are correct. Jan 11, 2022 · System information (version) OpenCV => 4. Aug 4, 2020 · 長雨が止み、ようやく夏らしくなってきた。しかし、流行り病の弱自粛中で遠出は禁物とのこと。どうしたものか。さて、細線化（スケルトン化）の画像処理アルゴリズムはOpenCVには無かった。※1ただ、scikit-imageモジュールにあったのでOpenCVとscikit-imageを組み合わせて細線化をやってみ Feb 15, 2017 · The easiest way for me would be to thin the image to 1px thickness and then use hit and miss transform to detect the endpoints. The algorithm must satisfy the 1 pixel thickness and connectedness criteria. Zhang and C. This can be expressed as the union of skeleton subsets where each subset is given by the following expression (A-Binary image and B-structuring element) This is the implementation of the Zhang-Suen thinning algorithm using OpenCV. Function Documentation Generated on Mon May 19 2025 23:06:37 for OpenCV by Here is my attempt. IMREAD_GRAYSCALE) # 二值化图像 Jan 6, 2025 · OpenCV 是一个功能强大且易于使用的库，广泛应用于图像处理和计算机视觉领域。从读取和显示图像，到颜色空间转换、图像缩放、翻转、边缘检测、高斯模糊、形态学操作以及图像平滑和绘制，本文详细介绍了 OpenCV 的基础使用方法，附带了丰富的代码示例，帮助读者更直观地理解和应用。 Python: cv. =) "Guo, Hall - 1989 - Parallel thinning with two-subiteration algorithms". 同学偶然问我问题，怎么画出一个轮廓的中心轮廓。然后我回去查了一下，其实发现这个其实有专门的算法叫做细化算法。 3 days ago · We manually created a structuring elements in the previous examples with help of Numpy. py", line 11, in thinned = cv2 一、 简介在数字图像处理中，二值图像的骨架提取操作非常常用。骨架(skeleton)提取也称为细化(thinning), 它被用来获取区域中2个(或多个)边界的像素中心线，使该区域的表达更加简洁、更方便处理。 Oct 18, 2023 · opencv骨架提取python，#opencv骨架提取python##1. Dec 4, 2014 · Thinning is the operation that takes a binary image and contracts the foreground until only single-pixel wide lines remain. 84 opencv-python-headless 4. thinning()来实现图像细化。 When I did thining on the second picture, it looked much better than on the image I have now. ndarray` in Python). (A `numpy. png") thinned = cv2. I have tried a number of things like erosion on the source image as to thin the branches and disconnect them from stem, erosion to the point the whole stem were gone and then subtracting the leafs from the original image and also putting black pixels around the CV：：ximgproc：：thinning（）函数实现了两种细化算法，THINNING_ZHANGSUEN为上面说的并行算法，THINNING_GUOHALL为上面说的 串行算法 ；串行算法和并行算法的共同点是进行第n次迭代时都需要第n-1次处理的结果，区别是串行算法还需要本次迭代已经处理过的像素点情况。 Feb 28, 2014 · 1. Dilation and Erosion), with the creation of custom kernels, in order to extract straight lines on the horizontal and vertical axes. Jan 30, 2013 · If we run canny, for each thin line we have two line. I'm using cv2. Mar 2, 2021 · The images I am working on are like this one The main goal is to calculate the crease (the blue line like shown in this image) The idea is that I have to find the center curved line of this image, detect its two extreme points so I can draw the red line, then find the centroid point to draw the blue line I tried the skeleton algorithm: import cv2 import numpy as np from matplotlib import May 12, 2012 · Simply, it make a thick blob very thin, may be one pixel width. cvtColor(image, cv2. I thought I could modify existing code and then divide the contour into segments but I'm not having much luck. Here's some simple basic C++ code, which can probably converted to python easily: Jul 15, 2024 · 本文介绍了利用Python及OpenCV实现二值图像中心线提取的方法，涵盖算法原理、代码示例与应用场景。该技术广泛应用于形态学分析、特征提取及目标识别等领域，助力开发者高效处理与分析图像。 May 11, 2025 · Python: cv. The algorithm is explained in "A fast parallel algorithm for thinning digital patterns" by T. OpenCV 3. 在OpenCV中，骨架提取可以通过使用函数cv2. 骨架提取与图像细化类似，都是指将二值图像中一部分点去掉后，剩下的点仍能保持原来的形状，即图像的骨架，如下图所示。 Zhang-Suen 算法，在很多的图像处理库（scikit-image, OpenCV）中，被广泛的使用，例如： f… Aug 8, 2020 · OpenCVの細線化(thinning)を試してみます。 Pythonサンプルプログラム 細線化をやってみましたが、Scikit-ImageとOpenCVで、同じ Jan 8, 2013 · occupied in the paper "Principal Warps: Thin-Plate Splines and Decomposition of Deformations", by F. I’ve added a few arrows to point out the line that I want Sep 15, 2017 · Hello, I'm trying to automatically determine length of a spline - well, in this case it's the length of a snake. Suen. ximgproc. Detect hand-drawing shapes. Remove buttons from their background so I can re-use button image. com. Sep 12, 2017 · これまではOpenCVのメインモジュールについて紹介してきました。今回は、OpenCVの拡張モジュール群であるopencv_contribについて紹介します。 2. Understand the memory managment while using imread() on allocated Mat. findContours function. Jan 8, 2013 · cv::ximgproc::thinning (InputArray src, OutputArray dst, int thinningType=THINNING_ZHANGSUEN) Applies a binary blob thinning operation, to achieve a skeletization of the input image. Get rid of all gray pixels and make them all black or white. 6w次，点赞43次，收藏223次。文章目录一、骨架提取函数 skeletonize()一、骨架提取函数 medial_axis()一、骨架提取函数 skeletonize()骨架提取，也叫二值图像细化。 Feb 2, 2019 · I have been using the Thin Plate Warping algorithm from OpenCV for quite a long time, but still, just have a vague idea about it. But I have been having trouble doing this. 8 Sep 8, 2021 · Hi, My first serious foray into OpenCV and, as part of a bigger project, I need to detect the curved line in an image based on a couple of mouse clicks. 8. 引言在计算机视觉领域，骨架提取是一种常用的图像处理技术。通过骨架提取，我们可以将图像中的对象缩减为其主要轮廓，以便进行形状分析、目标识别等应用。 Your code has a bug. Thinning is the process of reducing the thickness of foreground regions in an image while preserving the connectivity of the foreground pixels. This can be useful for feature extraction, and/or representing an object’s topology. 2. 1 中心线提取算法. Output matrix will be size (windowRows*windowCols, windowRows*windowCols). 3 opencv. 4k次，点赞6次，收藏3次。本文介绍了OpenCV中的图像细化技术，通过细化操作减少噪声、提取形状信息，常用算法有Zhang-Suen和Guo-Hall。提供了一个Python示例，展示了如何在OpenCV中实现图像细化并结合实际应用进行展示。 Mar 21, 2011 · 二値化された画像において、線の中心1画素分だけを残すように線を細くする処理を細線化といいます。細線化のアルゴリズムにはHilditch、田村の方法、Zhang Suenなど、いろいろあるのですが、ここでは田村の方法について説明します。 Feb 17, 2014 · Python中的图像处理：使用OpenCV进行图像分析图像处理是计算机视觉领域的重要组成部分，能够帮助我们提取和分析图像中的信息。Python作为一种广泛使用的编程语言，提供了多种图像处理库，其中OpenCV(Open Source Computer Vision Library)是最为知名和强大的选择之一 Aug 9, 2019 · As mentioned in the OpenCV pypi web page: If you have previous version of OpenCV installed remove it before installation to avoid conflicts. Sadly i can only send one embedded media picture so i chose picture 2 but i will try to Sep 2, 2019 · C++语言二开时，需要：#include cv::ximgproc::thinning输入图像是一个单通道的灰度图像。该函数是opencv_contrib扩展模块中的内容。图像细化算法非常典型的用途在OCR文字识别领域中。 Oct 26, 2020 · 使用OpenCV实现骨架提取. Contribute to ulikoehler/cv_algorithms development by creating an account on GitHub. THINNING_GUOHALL. pip install opencv-contrib-python==4. 統計、数値計算などの領域を軸に、ソフトウェアエンジニア・データサイエンティストとして働いています。 ・お問い合わせはこちら ・当サイトのご利用条件と免責事項 ・当サイトのプライバシーポリシー Jul 24, 2022 · 本プログラムでは、OpenCVのcv2. Canny(). – Oct 17, 2024 · Your suggestions are correct. Implementation of a fast thinning algorithm using morphology. We will see how to use it. I used built-in functions come with OpenCV , Scipy and Scikit-Image. tuna. thinning(img, skeleton) cv2. thinning(cv2. Thinning is performed in place in C++ and a new `numpy Guo and Hall thinning algorithm ===== This is a Python 3 module of Guo and Hall* thinning algorithm implemented in C. Measure distance between two lines. 84 python 3. Some people here mentioned a Japanese article where it is implemented in c++ so is there any way we could have it included into openCV? Jul 21, 2019 · 标签：algorithm 大神 问题 OpenCV 算法 thinning https 轮廓 一、问题描述. Sudoku Solver - Part 2. Mar 28, 2021 · I would like to turn the blurry lines into sharp thin lines if possible. 60, opencv-python-headless 4. When I do WarpImage, the image gets warped properly, however when I then use estimateTransformation of some manually inputted points, the points do not map correctly. Jul 26, 2017 · One nice and robust technique to detect line segments is LSD (line segment detector), available in openCV since openCV 3. May 14, 2025 · Write a routine to perform Zhang-Suen thinning on an image matrix of ones and zeroes. Applies a binary blob thinning operation, to achieve a skeletization of the input image. thinning_zhangsuen细化算法： - zhang-suen细化算法是一种迭代算法，通过两个迭代过程来细化图像。 Jan 15, 2025 · pip install opencv-python numpy matplotlib 步骤 2: 导入库. 5. thinning函数，故 Mar 24, 2020 · 算法流程 首先要反转原图像，因为算法之后所有的操作都将0作为前景，将1作为背景。 中心像素x_1(x,y)的8 近邻定义如下所示： 考虑以下两个步骤 步骤1：执行光栅扫描并标记满足以下5个条件的所有像素： 这是一个黑色像素； 顺时针查看x2、x3、、x9、x2时，从0到1的变化次数仅为1; x OpenCV for Mobile Platforms • Include OpenCV. We will use the OpenCV function morphologyEx(). png", cv2. Find the center using thinning (ZhangSuen) ZhanSuenThinning(binImage, thin); Python OpenCV Drawing Line Width. You signed out in another tab or window. Changing the following code has made it run 3 times faster for me. Jun 2, 2021 · The images I am working on are like this one The main goal is to calculate the crease (the blue line like shown in this image) The idea is that I have to find the center curved line of this image, detect its two … Jan 3, 2024 · cv2. Image stitching from a live video stream Jul 21, 2019 · 文章浏览阅读1. see my PR Optimization ximgproc::thinning by sturkmen72 · Pull Request #3801 · opencv/opencv_contrib (github. You should not add output_image_Ns together, but after each morphologyEx call calculate input_image-output_image_N and use that as input in the next step. ximgproc Dec 7, 2023 · 文章浏览阅读1. Essentially trying to find the closes continuous line to the points selected with the mouse. thinning(binary) Mar 8, 2020 · System Information Ubuntu 11. neix lshp pjxgdu uwwa wya mtvy jmbghavp fwqq txtke pghky